The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1 | |
| 2 | /* pngwrite.c - general routines to write a PNG file |
| 3 | * |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 4 | * Last changed in libpng 1.6.10 [March 6, 2014] |
| 5 | * Copyright (c) 1998-2014 Glenn Randers-Pehrson |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| 7 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 8 | * |
| 9 | * This code is released under the libpng license. |
| 10 | * For conditions of distribution and use, see the disclaimer |
| 11 | * and license in png.h |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 12 | */ |
| 13 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 14 | #include "pngpriv.h" |
| 15 | #if defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) && defined(PNG_STDIO_SUPPORTED) |
| 16 | # include <errno.h> |
| 17 | #endif |
| 18 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 19 | #ifdef PNG_WRITE_SUPPORTED |
| 20 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 21 | #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED |
| 22 | /* Write out all the unknown chunks for the current given location */ |
| 23 | static void |
| 24 | write_unknown_chunks(png_structrp png_ptr, png_const_inforp info_ptr, |
| 25 | unsigned int where) |
| 26 | { |
| 27 | if (info_ptr->unknown_chunks_num) |
| 28 | { |
| 29 | png_const_unknown_chunkp up; |
| 30 | |
| 31 | png_debug(5, "writing extra chunks"); |
| 32 | |
| 33 | for (up = info_ptr->unknown_chunks; |
| 34 | up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num; |
| 35 | ++up) |
| 36 | if (up->location & where) |
| 37 | { |
| 38 | /* If per-chunk unknown chunk handling is enabled use it, otherwise |
| 39 | * just write the chunks the application has set. |
| 40 | */ |
| 41 | #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED |
| 42 | int keep = png_handle_as_unknown(png_ptr, up->name); |
| 43 | |
| 44 | /* NOTE: this code is radically different from the read side in the |
| 45 | * matter of handling an ancillary unknown chunk. In the read side |
| 46 | * the default behavior is to discard it, in the code below the default |
| 47 | * behavior is to write it. Critical chunks are, however, only |
| 48 | * written if explicitly listed or if the default is set to write all |
| 49 | * unknown chunks. |
| 50 | * |
| 51 | * The default handling is also slightly weird - it is not possible to |
| 52 | * stop the writing of all unsafe-to-copy chunks! |
| 53 | * |
| 54 | * TODO: REVIEW: this would seem to be a bug. |
| 55 | */ |
| 56 | if (keep != PNG_HANDLE_CHUNK_NEVER && |
| 57 | ((up->name[3] & 0x20) /* safe-to-copy overrides everything */ || |
| 58 | keep == PNG_HANDLE_CHUNK_ALWAYS || |
| 59 | (keep == PNG_HANDLE_CHUNK_AS_DEFAULT && |
| 60 | png_ptr->unknown_default == PNG_HANDLE_CHUNK_ALWAYS))) |
| 61 | #endif |
| 62 | { |
| 63 | /* TODO: review, what is wrong with a zero length unknown chunk? */ |
| 64 | if (up->size == 0) |
| 65 | png_warning(png_ptr, "Writing zero-length unknown chunk"); |
| 66 | |
| 67 | png_write_chunk(png_ptr, up->name, up->data, up->size); |
| 68 | } |
| 69 | } |
| 70 | } |
| 71 | } |
| 72 | #endif /* PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED */ |
| 73 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 74 | /* Writes all the PNG information. This is the suggested way to use the |
| 75 | * library. If you have a new chunk to add, make a function to write it, |
| 76 | * and put it in the correct location here. If you want the chunk written |
| 77 | * after the image data, put it in png_write_end(). I strongly encourage |
| 78 | * you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing |
| 79 | * the chunk, as that will keep the code from breaking if you want to just |
| 80 | * write a plain PNG file. If you have long comments, I suggest writing |
| 81 | * them in png_write_end(), and compressing them. |
| 82 | */ |
| 83 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 84 | png_write_info_before_PLTE(png_structrp png_ptr, png_const_inforp info_ptr) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 85 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 86 | png_debug(1, "in png_write_info_before_PLTE"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 87 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 88 | if (png_ptr == NULL || info_ptr == NULL) |
| 89 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 90 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 91 | if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE)) |
| 92 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 93 | /* Write PNG signature */ |
| 94 | png_write_sig(png_ptr); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 95 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 96 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
| 97 | if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) && \ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 98 | (png_ptr->mng_features_permitted)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 99 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 100 | png_warning(png_ptr, "MNG features are not allowed in a PNG datastream"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 101 | png_ptr->mng_features_permitted = 0; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 102 | } |
| 103 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 104 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 105 | /* Write IHDR information. */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 106 | png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 107 | info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type, |
| 108 | info_ptr->filter_type, |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 109 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 110 | info_ptr->interlace_type |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 111 | #else |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 112 | 0 |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 113 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 114 | ); |
| 115 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 116 | /* The rest of these check to see if the valid field has the appropriate |
| 117 | * flag set, and if it does, writes the chunk. |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 118 | * |
| 119 | * 1.6.0: COLORSPACE support controls the writing of these chunks too, and |
| 120 | * the chunks will be written if the WRITE routine is there and information |
| 121 | * is available in the COLORSPACE. (See png_colorspace_sync_info in png.c |
| 122 | * for where the valid flags get set.) |
| 123 | * |
| 124 | * Under certain circumstances the colorspace can be invalidated without |
| 125 | * syncing the info_struct 'valid' flags; this happens if libpng detects and |
| 126 | * error and calls png_error while the color space is being set, yet the |
| 127 | * application continues writing the PNG. So check the 'invalid' flag here |
| 128 | * too. |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 129 | */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 130 | #ifdef PNG_GAMMA_SUPPORTED |
| 131 | # ifdef PNG_WRITE_gAMA_SUPPORTED |
| 132 | if (!(info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) && |
| 133 | (info_ptr->colorspace.flags & PNG_COLORSPACE_FROM_gAMA) && |
| 134 | (info_ptr->valid & PNG_INFO_gAMA)) |
| 135 | png_write_gAMA_fixed(png_ptr, info_ptr->colorspace.gamma); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 136 | # endif |
| 137 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 138 | |
| 139 | #ifdef PNG_COLORSPACE_SUPPORTED |
| 140 | /* Write only one of sRGB or an ICC profile. If a profile was supplied |
| 141 | * and it matches one of the known sRGB ones issue a warning. |
| 142 | */ |
| 143 | # ifdef PNG_WRITE_iCCP_SUPPORTED |
| 144 | if (!(info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) && |
| 145 | (info_ptr->valid & PNG_INFO_iCCP)) |
| 146 | { |
| 147 | # ifdef PNG_WRITE_sRGB_SUPPORTED |
| 148 | if (info_ptr->valid & PNG_INFO_sRGB) |
| 149 | png_app_warning(png_ptr, |
| 150 | "profile matches sRGB but writing iCCP instead"); |
| 151 | # endif |
| 152 | |
| 153 | png_write_iCCP(png_ptr, info_ptr->iccp_name, |
| 154 | info_ptr->iccp_profile); |
| 155 | } |
| 156 | # ifdef PNG_WRITE_sRGB_SUPPORTED |
| 157 | else |
| 158 | # endif |
| 159 | # endif |
| 160 | |
| 161 | # ifdef PNG_WRITE_sRGB_SUPPORTED |
| 162 | if (!(info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) && |
| 163 | (info_ptr->valid & PNG_INFO_sRGB)) |
| 164 | png_write_sRGB(png_ptr, info_ptr->colorspace.rendering_intent); |
| 165 | # endif /* WRITE_sRGB */ |
| 166 | #endif /* COLORSPACE */ |
| 167 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 168 | #ifdef PNG_WRITE_sBIT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 169 | if (info_ptr->valid & PNG_INFO_sBIT) |
| 170 | png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type); |
| 171 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 172 | |
| 173 | #ifdef PNG_COLORSPACE_SUPPORTED |
| 174 | # ifdef PNG_WRITE_cHRM_SUPPORTED |
| 175 | if (!(info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) && |
| 176 | (info_ptr->colorspace.flags & PNG_COLORSPACE_FROM_cHRM) && |
| 177 | (info_ptr->valid & PNG_INFO_cHRM)) |
| 178 | png_write_cHRM_fixed(png_ptr, &info_ptr->colorspace.end_points_xy); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 179 | # endif |
| 180 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 181 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 182 | #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 183 | write_unknown_chunks(png_ptr, info_ptr, PNG_HAVE_IHDR); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 184 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 185 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 186 | png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE; |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 191 | png_write_info(png_structrp png_ptr, png_const_inforp info_ptr) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 192 | { |
| 193 | #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) |
| 194 | int i; |
| 195 | #endif |
| 196 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 197 | png_debug(1, "in png_write_info"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 198 | |
| 199 | if (png_ptr == NULL || info_ptr == NULL) |
| 200 | return; |
| 201 | |
| 202 | png_write_info_before_PLTE(png_ptr, info_ptr); |
| 203 | |
| 204 | if (info_ptr->valid & PNG_INFO_PLTE) |
| 205 | png_write_PLTE(png_ptr, info_ptr->palette, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 206 | (png_uint_32)info_ptr->num_palette); |
| 207 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 208 | else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 209 | png_error(png_ptr, "Valid palette required for paletted images"); |
| 210 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 211 | #ifdef PNG_WRITE_tRNS_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 212 | if (info_ptr->valid & PNG_INFO_tRNS) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 213 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 214 | #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 215 | /* Invert the alpha channel (in tRNS) */ |
| 216 | if ((png_ptr->transformations & PNG_INVERT_ALPHA) && |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 217 | info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 218 | { |
| 219 | int j; |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 220 | for (j = 0; j<(int)info_ptr->num_trans; j++) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 221 | info_ptr->trans_alpha[j] = |
| 222 | (png_byte)(255 - info_ptr->trans_alpha[j]); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 223 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 224 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 225 | png_write_tRNS(png_ptr, info_ptr->trans_alpha, &(info_ptr->trans_color), |
| 226 | info_ptr->num_trans, info_ptr->color_type); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 227 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 228 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 229 | #ifdef PNG_WRITE_bKGD_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 230 | if (info_ptr->valid & PNG_INFO_bKGD) |
| 231 | png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type); |
| 232 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 233 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 234 | #ifdef PNG_WRITE_hIST_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 235 | if (info_ptr->valid & PNG_INFO_hIST) |
| 236 | png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette); |
| 237 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 238 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 239 | #ifdef PNG_WRITE_oFFs_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 240 | if (info_ptr->valid & PNG_INFO_oFFs) |
| 241 | png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 242 | info_ptr->offset_unit_type); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 243 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 244 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 245 | #ifdef PNG_WRITE_pCAL_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 246 | if (info_ptr->valid & PNG_INFO_pCAL) |
| 247 | png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 248 | info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams, |
| 249 | info_ptr->pcal_units, info_ptr->pcal_params); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 250 | #endif |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 251 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 252 | #ifdef PNG_WRITE_sCAL_SUPPORTED |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 253 | if (info_ptr->valid & PNG_INFO_sCAL) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 254 | png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit, |
| 255 | info_ptr->scal_s_width, info_ptr->scal_s_height); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 256 | #endif /* sCAL */ |
| 257 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 258 | #ifdef PNG_WRITE_pHYs_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 259 | if (info_ptr->valid & PNG_INFO_pHYs) |
| 260 | png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 261 | info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 262 | #endif /* pHYs */ |
| 263 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 264 | #ifdef PNG_WRITE_tIME_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 265 | if (info_ptr->valid & PNG_INFO_tIME) |
| 266 | { |
| 267 | png_write_tIME(png_ptr, &(info_ptr->mod_time)); |
| 268 | png_ptr->mode |= PNG_WROTE_tIME; |
| 269 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 270 | #endif /* tIME */ |
| 271 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 272 | #ifdef PNG_WRITE_sPLT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 273 | if (info_ptr->valid & PNG_INFO_sPLT) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 274 | for (i = 0; i < (int)info_ptr->splt_palettes_num; i++) |
| 275 | png_write_sPLT(png_ptr, info_ptr->splt_palettes + i); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 276 | #endif /* sPLT */ |
| 277 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 278 | #ifdef PNG_WRITE_TEXT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 279 | /* Check to see if we need to write text chunks */ |
| 280 | for (i = 0; i < info_ptr->num_text; i++) |
| 281 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 282 | png_debug2(2, "Writing header text chunk %d, type %d", i, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 283 | info_ptr->text[i].compression); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 284 | /* An internationalized chunk? */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 285 | if (info_ptr->text[i].compression > 0) |
| 286 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 287 | #ifdef PNG_WRITE_iTXt_SUPPORTED |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 288 | /* Write international chunk */ |
| 289 | png_write_iTXt(png_ptr, |
| 290 | info_ptr->text[i].compression, |
| 291 | info_ptr->text[i].key, |
| 292 | info_ptr->text[i].lang, |
| 293 | info_ptr->text[i].lang_key, |
| 294 | info_ptr->text[i].text); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 295 | #else |
| 296 | png_warning(png_ptr, "Unable to write international text"); |
| 297 | #endif |
| 298 | /* Mark this chunk as written */ |
| 299 | info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; |
| 300 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 301 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 302 | /* If we want a compressed text chunk */ |
| 303 | else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt) |
| 304 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 305 | #ifdef PNG_WRITE_zTXt_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 306 | /* Write compressed chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 307 | png_write_zTXt(png_ptr, info_ptr->text[i].key, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 308 | info_ptr->text[i].text, 0, |
| 309 | info_ptr->text[i].compression); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 310 | #else |
| 311 | png_warning(png_ptr, "Unable to write compressed text"); |
| 312 | #endif |
| 313 | /* Mark this chunk as written */ |
| 314 | info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR; |
| 315 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 316 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 317 | else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE) |
| 318 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 319 | #ifdef PNG_WRITE_tEXt_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 320 | /* Write uncompressed chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 321 | png_write_tEXt(png_ptr, info_ptr->text[i].key, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 322 | info_ptr->text[i].text, |
| 323 | 0); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 324 | /* Mark this chunk as written */ |
| 325 | info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 326 | #else |
| 327 | /* Can't get here */ |
| 328 | png_warning(png_ptr, "Unable to write uncompressed text"); |
| 329 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 330 | } |
| 331 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 332 | #endif /* tEXt */ |
| 333 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 334 | #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 335 | write_unknown_chunks(png_ptr, info_ptr, PNG_HAVE_PLTE); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 336 | #endif |
| 337 | } |
| 338 | |
| 339 | /* Writes the end of the PNG file. If you don't want to write comments or |
| 340 | * time information, you can pass NULL for info. If you already wrote these |
| 341 | * in png_write_info(), do not write them again here. If you have long |
| 342 | * comments, I suggest writing them here, and compressing them. |
| 343 | */ |
| 344 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 345 | png_write_end(png_structrp png_ptr, png_inforp info_ptr) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 346 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 347 | png_debug(1, "in png_write_end"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 348 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 349 | if (png_ptr == NULL) |
| 350 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 351 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 352 | if (!(png_ptr->mode & PNG_HAVE_IDAT)) |
| 353 | png_error(png_ptr, "No IDATs written into file"); |
| 354 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 355 | #ifdef PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED |
| 356 | if (png_ptr->num_palette_max > png_ptr->num_palette) |
| 357 | png_benign_error(png_ptr, "Wrote palette index exceeding num_palette"); |
| 358 | #endif |
| 359 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 360 | /* See if user wants us to write information chunks */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 361 | if (info_ptr != NULL) |
| 362 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 363 | #ifdef PNG_WRITE_TEXT_SUPPORTED |
| 364 | int i; /* local index variable */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 365 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 366 | #ifdef PNG_WRITE_tIME_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 367 | /* Check to see if user has supplied a time chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 368 | if ((info_ptr->valid & PNG_INFO_tIME) && |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 369 | !(png_ptr->mode & PNG_WROTE_tIME)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 370 | png_write_tIME(png_ptr, &(info_ptr->mod_time)); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 371 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 372 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 373 | #ifdef PNG_WRITE_TEXT_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 374 | /* Loop through comment chunks */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 375 | for (i = 0; i < info_ptr->num_text; i++) |
| 376 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 377 | png_debug2(2, "Writing trailer text chunk %d, type %d", i, |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 378 | info_ptr->text[i].compression); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 379 | /* An internationalized chunk? */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 380 | if (info_ptr->text[i].compression > 0) |
| 381 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 382 | #ifdef PNG_WRITE_iTXt_SUPPORTED |
| 383 | /* Write international chunk */ |
| 384 | png_write_iTXt(png_ptr, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 385 | info_ptr->text[i].compression, |
| 386 | info_ptr->text[i].key, |
| 387 | info_ptr->text[i].lang, |
| 388 | info_ptr->text[i].lang_key, |
| 389 | info_ptr->text[i].text); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 390 | #else |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 391 | png_warning(png_ptr, "Unable to write international text"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 392 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 393 | /* Mark this chunk as written */ |
| 394 | info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 395 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 396 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 397 | else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt) |
| 398 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 399 | #ifdef PNG_WRITE_zTXt_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 400 | /* Write compressed chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 401 | png_write_zTXt(png_ptr, info_ptr->text[i].key, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 402 | info_ptr->text[i].text, 0, |
| 403 | info_ptr->text[i].compression); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 404 | #else |
| 405 | png_warning(png_ptr, "Unable to write compressed text"); |
| 406 | #endif |
| 407 | /* Mark this chunk as written */ |
| 408 | info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR; |
| 409 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 410 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 411 | else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE) |
| 412 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 413 | #ifdef PNG_WRITE_tEXt_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 414 | /* Write uncompressed chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 415 | png_write_tEXt(png_ptr, info_ptr->text[i].key, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 416 | info_ptr->text[i].text, 0); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 417 | #else |
| 418 | png_warning(png_ptr, "Unable to write uncompressed text"); |
| 419 | #endif |
| 420 | |
| 421 | /* Mark this chunk as written */ |
| 422 | info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; |
| 423 | } |
| 424 | } |
| 425 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 426 | #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 427 | write_unknown_chunks(png_ptr, info_ptr, PNG_AFTER_IDAT); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 428 | #endif |
| 429 | } |
| 430 | |
| 431 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 432 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 433 | /* Write end of PNG file */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 434 | png_write_IEND(png_ptr); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 435 | /* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03, |
| 436 | * and restored again in libpng-1.2.30, may cause some applications that |
| 437 | * do not set png_ptr->output_flush_fn to crash. If your application |
| 438 | * experiences a problem, please try building libpng with |
| 439 | * PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED defined, and report the event to |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 440 | * png-mng-implement at lists.sf.net . |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 441 | */ |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 442 | #ifdef PNG_WRITE_FLUSH_SUPPORTED |
| 443 | # ifdef PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 444 | png_flush(png_ptr); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 445 | # endif |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 446 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 447 | } |
| 448 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 449 | #ifdef PNG_CONVERT_tIME_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 450 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 451 | png_convert_from_struct_tm(png_timep ptime, PNG_CONST struct tm * ttime) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 452 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 453 | png_debug(1, "in png_convert_from_struct_tm"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 454 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 455 | ptime->year = (png_uint_16)(1900 + ttime->tm_year); |
| 456 | ptime->month = (png_byte)(ttime->tm_mon + 1); |
| 457 | ptime->day = (png_byte)ttime->tm_mday; |
| 458 | ptime->hour = (png_byte)ttime->tm_hour; |
| 459 | ptime->minute = (png_byte)ttime->tm_min; |
| 460 | ptime->second = (png_byte)ttime->tm_sec; |
| 461 | } |
| 462 | |
| 463 | void PNGAPI |
| 464 | png_convert_from_time_t(png_timep ptime, time_t ttime) |
| 465 | { |
| 466 | struct tm *tbuf; |
| 467 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 468 | png_debug(1, "in png_convert_from_time_t"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 469 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 470 | tbuf = gmtime(&ttime); |
| 471 | png_convert_from_struct_tm(ptime, tbuf); |
| 472 | } |
| 473 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 474 | |
| 475 | /* Initialize png_ptr structure, and allocate any memory needed */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 476 | PNG_FUNCTION(png_structp,PNGAPI |
| 477 | png_create_write_struct,(png_const_charp user_png_ver, png_voidp error_ptr, |
| 478 | png_error_ptr error_fn, png_error_ptr warn_fn),PNG_ALLOCATED) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 479 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 480 | #ifndef PNG_USER_MEM_SUPPORTED |
| 481 | png_structrp png_ptr = png_create_png_struct(user_png_ver, error_ptr, |
| 482 | error_fn, warn_fn, NULL, NULL, NULL); |
| 483 | #else |
| 484 | return png_create_write_struct_2(user_png_ver, error_ptr, error_fn, |
| 485 | warn_fn, NULL, NULL, NULL); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 486 | } |
| 487 | |
| 488 | /* Alternate initialize png_ptr structure, and allocate any memory needed */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 489 | PNG_FUNCTION(png_structp,PNGAPI |
| 490 | png_create_write_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr, |
| 491 | png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, |
| 492 | png_malloc_ptr malloc_fn, png_free_ptr free_fn),PNG_ALLOCATED) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 493 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 494 | png_structrp png_ptr = png_create_png_struct(user_png_ver, error_ptr, |
| 495 | error_fn, warn_fn, mem_ptr, malloc_fn, free_fn); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 496 | #endif /* PNG_USER_MEM_SUPPORTED */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 497 | if (png_ptr != NULL) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 498 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 499 | /* Set the zlib control values to defaults; they can be overridden by the |
| 500 | * application after the struct has been created. |
| 501 | */ |
| 502 | png_ptr->zbuffer_size = PNG_ZBUF_SIZE; |
| 503 | |
| 504 | /* The 'zlib_strategy' setting is irrelevant because png_default_claim in |
| 505 | * pngwutil.c defaults it according to whether or not filters will be |
| 506 | * used, and ignores this setting. |
| 507 | */ |
| 508 | png_ptr->zlib_strategy = PNG_Z_DEFAULT_STRATEGY; |
| 509 | png_ptr->zlib_level = PNG_Z_DEFAULT_COMPRESSION; |
| 510 | png_ptr->zlib_mem_level = 8; |
| 511 | png_ptr->zlib_window_bits = 15; |
| 512 | png_ptr->zlib_method = 8; |
| 513 | |
| 514 | #ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED |
| 515 | png_ptr->zlib_text_strategy = PNG_TEXT_Z_DEFAULT_STRATEGY; |
| 516 | png_ptr->zlib_text_level = PNG_TEXT_Z_DEFAULT_COMPRESSION; |
| 517 | png_ptr->zlib_text_mem_level = 8; |
| 518 | png_ptr->zlib_text_window_bits = 15; |
| 519 | png_ptr->zlib_text_method = 8; |
| 520 | #endif /* PNG_WRITE_COMPRESSED_TEXT_SUPPORTED */ |
| 521 | |
| 522 | /* This is a highly dubious configuration option; by default it is off, |
| 523 | * but it may be appropriate for private builds that are testing |
| 524 | * extensions not conformant to the current specification, or of |
| 525 | * applications that must not fail to write at all costs! |
| 526 | */ |
| 527 | #ifdef PNG_BENIGN_WRITE_ERRORS_SUPPORTED |
| 528 | png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN; |
| 529 | /* In stable builds only warn if an application error can be completely |
| 530 | * handled. |
| 531 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 532 | #endif |
| 533 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 534 | /* App warnings are warnings in release (or release candidate) builds but |
| 535 | * are errors during development. |
| 536 | */ |
| 537 | #if PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC |
| 538 | png_ptr->flags |= PNG_FLAG_APP_WARNINGS_WARN; |
| 539 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 540 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 541 | /* TODO: delay this, it can be done in png_init_io() (if the app doesn't |
| 542 | * do it itself) avoiding setting the default function if it is not |
| 543 | * required. |
| 544 | */ |
| 545 | png_set_write_fn(png_ptr, NULL, NULL, NULL); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 546 | } |
| 547 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 548 | return png_ptr; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 549 | } |
| 550 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 551 | |
| 552 | /* Write a few rows of image data. If the image is interlaced, |
| 553 | * either you will have to write the 7 sub images, or, if you |
| 554 | * have called png_set_interlace_handling(), you will have to |
| 555 | * "write" the image seven times. |
| 556 | */ |
| 557 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 558 | png_write_rows(png_structrp png_ptr, png_bytepp row, |
| 559 | png_uint_32 num_rows) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 560 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 561 | png_uint_32 i; /* row counter */ |
| 562 | png_bytepp rp; /* row pointer */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 563 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 564 | png_debug(1, "in png_write_rows"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 565 | |
| 566 | if (png_ptr == NULL) |
| 567 | return; |
| 568 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 569 | /* Loop through the rows */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 570 | for (i = 0, rp = row; i < num_rows; i++, rp++) |
| 571 | { |
| 572 | png_write_row(png_ptr, *rp); |
| 573 | } |
| 574 | } |
| 575 | |
| 576 | /* Write the image. You only need to call this function once, even |
| 577 | * if you are writing an interlaced image. |
| 578 | */ |
| 579 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 580 | png_write_image(png_structrp png_ptr, png_bytepp image) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 581 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 582 | png_uint_32 i; /* row index */ |
| 583 | int pass, num_pass; /* pass variables */ |
| 584 | png_bytepp rp; /* points to current row */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 585 | |
| 586 | if (png_ptr == NULL) |
| 587 | return; |
| 588 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 589 | png_debug(1, "in png_write_image"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 590 | |
| 591 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 592 | /* Initialize interlace handling. If image is not interlaced, |
| 593 | * this will set pass to 1 |
| 594 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 595 | num_pass = png_set_interlace_handling(png_ptr); |
| 596 | #else |
| 597 | num_pass = 1; |
| 598 | #endif |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 599 | /* Loop through passes */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 600 | for (pass = 0; pass < num_pass; pass++) |
| 601 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 602 | /* Loop through image */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 603 | for (i = 0, rp = image; i < png_ptr->height; i++, rp++) |
| 604 | { |
| 605 | png_write_row(png_ptr, *rp); |
| 606 | } |
| 607 | } |
| 608 | } |
| 609 | |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 610 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
| 611 | /* Performs intrapixel differencing */ |
| 612 | static void |
| 613 | png_do_write_intrapixel(png_row_infop row_info, png_bytep row) |
| 614 | { |
| 615 | png_debug(1, "in png_do_write_intrapixel"); |
| 616 | |
| 617 | if ((row_info->color_type & PNG_COLOR_MASK_COLOR)) |
| 618 | { |
| 619 | int bytes_per_pixel; |
| 620 | png_uint_32 row_width = row_info->width; |
| 621 | if (row_info->bit_depth == 8) |
| 622 | { |
| 623 | png_bytep rp; |
| 624 | png_uint_32 i; |
| 625 | |
| 626 | if (row_info->color_type == PNG_COLOR_TYPE_RGB) |
| 627 | bytes_per_pixel = 3; |
| 628 | |
| 629 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 630 | bytes_per_pixel = 4; |
| 631 | |
| 632 | else |
| 633 | return; |
| 634 | |
| 635 | for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) |
| 636 | { |
| 637 | *(rp) = (png_byte)((*rp - *(rp + 1)) & 0xff); |
| 638 | *(rp + 2) = (png_byte)((*(rp + 2) - *(rp + 1)) & 0xff); |
| 639 | } |
| 640 | } |
| 641 | |
| 642 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
| 643 | else if (row_info->bit_depth == 16) |
| 644 | { |
| 645 | png_bytep rp; |
| 646 | png_uint_32 i; |
| 647 | |
| 648 | if (row_info->color_type == PNG_COLOR_TYPE_RGB) |
| 649 | bytes_per_pixel = 6; |
| 650 | |
| 651 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 652 | bytes_per_pixel = 8; |
| 653 | |
| 654 | else |
| 655 | return; |
| 656 | |
| 657 | for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) |
| 658 | { |
| 659 | png_uint_32 s0 = (*(rp ) << 8) | *(rp + 1); |
| 660 | png_uint_32 s1 = (*(rp + 2) << 8) | *(rp + 3); |
| 661 | png_uint_32 s2 = (*(rp + 4) << 8) | *(rp + 5); |
| 662 | png_uint_32 red = (png_uint_32)((s0 - s1) & 0xffffL); |
| 663 | png_uint_32 blue = (png_uint_32)((s2 - s1) & 0xffffL); |
| 664 | *(rp ) = (png_byte)((red >> 8) & 0xff); |
| 665 | *(rp + 1) = (png_byte)(red & 0xff); |
| 666 | *(rp + 4) = (png_byte)((blue >> 8) & 0xff); |
| 667 | *(rp + 5) = (png_byte)(blue & 0xff); |
| 668 | } |
| 669 | } |
| 670 | #endif /* PNG_WRITE_16BIT_SUPPORTED */ |
| 671 | } |
| 672 | } |
| 673 | #endif /* PNG_MNG_FEATURES_SUPPORTED */ |
| 674 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 675 | /* Called by user to write a row of image data */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 676 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 677 | png_write_row(png_structrp png_ptr, png_const_bytep row) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 678 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 679 | /* 1.5.6: moved from png_struct to be a local structure: */ |
| 680 | png_row_info row_info; |
| 681 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 682 | if (png_ptr == NULL) |
| 683 | return; |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 684 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 685 | png_debug2(1, "in png_write_row (row %u, pass %d)", |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 686 | png_ptr->row_number, png_ptr->pass); |
| 687 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 688 | /* Initialize transformations and other stuff if first time */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 689 | if (png_ptr->row_number == 0 && png_ptr->pass == 0) |
| 690 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 691 | /* Make sure we wrote the header info */ |
| 692 | if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE)) |
| 693 | png_error(png_ptr, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 694 | "png_write_info was never called before png_write_row"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 695 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 696 | /* Check for transforms that have been set but were defined out */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 697 | #if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 698 | if (png_ptr->transformations & PNG_INVERT_MONO) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 699 | png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 700 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 701 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 702 | #if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 703 | if (png_ptr->transformations & PNG_FILLER) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 704 | png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 705 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 706 | #if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && \ |
| 707 | defined(PNG_READ_PACKSWAP_SUPPORTED) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 708 | if (png_ptr->transformations & PNG_PACKSWAP) |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 709 | png_warning(png_ptr, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 710 | "PNG_WRITE_PACKSWAP_SUPPORTED is not defined"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 711 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 712 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 713 | #if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 714 | if (png_ptr->transformations & PNG_PACK) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 715 | png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 716 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 717 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 718 | #if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 719 | if (png_ptr->transformations & PNG_SHIFT) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 720 | png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 721 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 722 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 723 | #if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 724 | if (png_ptr->transformations & PNG_BGR) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 725 | png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 726 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 727 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 728 | #if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 729 | if (png_ptr->transformations & PNG_SWAP_BYTES) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 730 | png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 731 | #endif |
| 732 | |
| 733 | png_write_start_row(png_ptr); |
| 734 | } |
| 735 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 736 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 737 | /* If interlaced and not interested in row, return */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 738 | if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) |
| 739 | { |
| 740 | switch (png_ptr->pass) |
| 741 | { |
| 742 | case 0: |
| 743 | if (png_ptr->row_number & 0x07) |
| 744 | { |
| 745 | png_write_finish_row(png_ptr); |
| 746 | return; |
| 747 | } |
| 748 | break; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 749 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 750 | case 1: |
| 751 | if ((png_ptr->row_number & 0x07) || png_ptr->width < 5) |
| 752 | { |
| 753 | png_write_finish_row(png_ptr); |
| 754 | return; |
| 755 | } |
| 756 | break; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 757 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 758 | case 2: |
| 759 | if ((png_ptr->row_number & 0x07) != 4) |
| 760 | { |
| 761 | png_write_finish_row(png_ptr); |
| 762 | return; |
| 763 | } |
| 764 | break; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 765 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 766 | case 3: |
| 767 | if ((png_ptr->row_number & 0x03) || png_ptr->width < 3) |
| 768 | { |
| 769 | png_write_finish_row(png_ptr); |
| 770 | return; |
| 771 | } |
| 772 | break; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 773 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 774 | case 4: |
| 775 | if ((png_ptr->row_number & 0x03) != 2) |
| 776 | { |
| 777 | png_write_finish_row(png_ptr); |
| 778 | return; |
| 779 | } |
| 780 | break; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 781 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 782 | case 5: |
| 783 | if ((png_ptr->row_number & 0x01) || png_ptr->width < 2) |
| 784 | { |
| 785 | png_write_finish_row(png_ptr); |
| 786 | return; |
| 787 | } |
| 788 | break; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 789 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 790 | case 6: |
| 791 | if (!(png_ptr->row_number & 0x01)) |
| 792 | { |
| 793 | png_write_finish_row(png_ptr); |
| 794 | return; |
| 795 | } |
| 796 | break; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 797 | |
| 798 | default: /* error: ignore it */ |
| 799 | break; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 800 | } |
| 801 | } |
| 802 | #endif |
| 803 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 804 | /* Set up row info for transformations */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 805 | row_info.color_type = png_ptr->color_type; |
| 806 | row_info.width = png_ptr->usr_width; |
| 807 | row_info.channels = png_ptr->usr_channels; |
| 808 | row_info.bit_depth = png_ptr->usr_bit_depth; |
| 809 | row_info.pixel_depth = (png_byte)(row_info.bit_depth * row_info.channels); |
| 810 | row_info.rowbytes = PNG_ROWBYTES(row_info.pixel_depth, row_info.width); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 811 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 812 | png_debug1(3, "row_info->color_type = %d", row_info.color_type); |
| 813 | png_debug1(3, "row_info->width = %u", row_info.width); |
| 814 | png_debug1(3, "row_info->channels = %d", row_info.channels); |
| 815 | png_debug1(3, "row_info->bit_depth = %d", row_info.bit_depth); |
| 816 | png_debug1(3, "row_info->pixel_depth = %d", row_info.pixel_depth); |
| 817 | png_debug1(3, "row_info->rowbytes = %lu", (unsigned long)row_info.rowbytes); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 818 | |
| 819 | /* Copy user's row into buffer, leaving room for filter byte. */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 820 | memcpy(png_ptr->row_buf + 1, row, row_info.rowbytes); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 821 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 822 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 823 | /* Handle interlacing */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 824 | if (png_ptr->interlaced && png_ptr->pass < 6 && |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 825 | (png_ptr->transformations & PNG_INTERLACE)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 826 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 827 | png_do_write_interlace(&row_info, png_ptr->row_buf + 1, png_ptr->pass); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 828 | /* This should always get caught above, but still ... */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 829 | if (!(row_info.width)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 830 | { |
| 831 | png_write_finish_row(png_ptr); |
| 832 | return; |
| 833 | } |
| 834 | } |
| 835 | #endif |
| 836 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 837 | #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 838 | /* Handle other transformations */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 839 | if (png_ptr->transformations) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 840 | png_do_write_transformations(png_ptr, &row_info); |
| 841 | #endif |
| 842 | |
| 843 | /* At this point the row_info pixel depth must match the 'transformed' depth, |
| 844 | * which is also the output depth. |
| 845 | */ |
| 846 | if (row_info.pixel_depth != png_ptr->pixel_depth || |
| 847 | row_info.pixel_depth != png_ptr->transformed_pixel_depth) |
| 848 | png_error(png_ptr, "internal write transform logic error"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 849 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 850 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 851 | /* Write filter_method 64 (intrapixel differencing) only if |
| 852 | * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and |
| 853 | * 2. Libpng did not write a PNG signature (this filter_method is only |
| 854 | * used in PNG datastreams that are embedded in MNG datastreams) and |
| 855 | * 3. The application called png_permit_mng_features with a mask that |
| 856 | * included PNG_FLAG_MNG_FILTER_64 and |
| 857 | * 4. The filter_method is 64 and |
| 858 | * 5. The color_type is RGB or RGBA |
| 859 | */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 860 | if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 861 | (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 862 | { |
| 863 | /* Intrapixel differencing */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 864 | png_do_write_intrapixel(&row_info, png_ptr->row_buf + 1); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 865 | } |
| 866 | #endif |
| 867 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 868 | /* Added at libpng-1.5.10 */ |
| 869 | #ifdef PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED |
| 870 | /* Check for out-of-range palette index */ |
| 871 | if (row_info.color_type == PNG_COLOR_TYPE_PALETTE && |
| 872 | png_ptr->num_palette_max >= 0) |
| 873 | png_do_check_palette_indexes(png_ptr, &row_info); |
| 874 | #endif |
| 875 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 876 | /* Find a filter if necessary, filter the row and write it out. */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 877 | png_write_find_filter(png_ptr, &row_info); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 878 | |
| 879 | if (png_ptr->write_row_fn != NULL) |
| 880 | (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass); |
| 881 | } |
| 882 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 883 | #ifdef PNG_WRITE_FLUSH_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 884 | /* Set the automatic flush interval or 0 to turn flushing off */ |
| 885 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 886 | png_set_flush(png_structrp png_ptr, int nrows) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 887 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 888 | png_debug(1, "in png_set_flush"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 889 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 890 | if (png_ptr == NULL) |
| 891 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 892 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 893 | png_ptr->flush_dist = (nrows < 0 ? 0 : nrows); |
| 894 | } |
| 895 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 896 | /* Flush the current output buffers now */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 897 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 898 | png_write_flush(png_structrp png_ptr) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 899 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 900 | png_debug(1, "in png_write_flush"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 901 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 902 | if (png_ptr == NULL) |
| 903 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 904 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 905 | /* We have already written out all of the data */ |
| 906 | if (png_ptr->row_number >= png_ptr->num_rows) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 907 | return; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 908 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 909 | png_compress_IDAT(png_ptr, NULL, 0, Z_SYNC_FLUSH); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 910 | png_ptr->flush_rows = 0; |
| 911 | png_flush(png_ptr); |
| 912 | } |
| 913 | #endif /* PNG_WRITE_FLUSH_SUPPORTED */ |
| 914 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 915 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED |
| 916 | static void png_reset_filter_heuristics(png_structrp png_ptr);/* forward decl */ |
| 917 | #endif |
| 918 | |
| 919 | /* Free any memory used in png_ptr struct without freeing the struct itself. */ |
| 920 | static void |
| 921 | png_write_destroy(png_structrp png_ptr) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 922 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 923 | png_debug(1, "in png_write_destroy"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 924 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 925 | /* Free any memory zlib uses */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 926 | if (png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) |
| 927 | deflateEnd(&png_ptr->zstream); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 928 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 929 | /* Free our memory. png_free checks NULL for us. */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 930 | png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 931 | png_free(png_ptr, png_ptr->row_buf); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 932 | #ifdef PNG_WRITE_FILTER_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 933 | png_free(png_ptr, png_ptr->prev_row); |
| 934 | png_free(png_ptr, png_ptr->sub_row); |
| 935 | png_free(png_ptr, png_ptr->up_row); |
| 936 | png_free(png_ptr, png_ptr->avg_row); |
| 937 | png_free(png_ptr, png_ptr->paeth_row); |
| 938 | #endif |
| 939 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 940 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 941 | /* Use this to save a little code space, it doesn't free the filter_costs */ |
| 942 | png_reset_filter_heuristics(png_ptr); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 943 | png_free(png_ptr, png_ptr->filter_costs); |
| 944 | png_free(png_ptr, png_ptr->inv_filter_costs); |
| 945 | #endif |
| 946 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 947 | #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED |
| 948 | png_free(png_ptr, png_ptr->chunk_list); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 949 | #endif |
| 950 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 951 | /* The error handling and memory handling information is left intact at this |
| 952 | * point: the jmp_buf may still have to be freed. See png_destroy_png_struct |
| 953 | * for how this happens. |
| 954 | */ |
| 955 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 956 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 957 | /* Free all memory used by the write. |
| 958 | * In libpng 1.6.0 this API changed quietly to no longer accept a NULL value for |
| 959 | * *png_ptr_ptr. Prior to 1.6.0 it would accept such a value and it would free |
| 960 | * the passed in info_structs but it would quietly fail to free any of the data |
| 961 | * inside them. In 1.6.0 it quietly does nothing (it has to be quiet because it |
| 962 | * has no png_ptr.) |
| 963 | */ |
| 964 | void PNGAPI |
| 965 | png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr) |
| 966 | { |
| 967 | png_debug(1, "in png_destroy_write_struct"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 968 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 969 | if (png_ptr_ptr != NULL) |
| 970 | { |
| 971 | png_structrp png_ptr = *png_ptr_ptr; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 972 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 973 | if (png_ptr != NULL) /* added in libpng 1.6.0 */ |
| 974 | { |
| 975 | png_destroy_info_struct(png_ptr, info_ptr_ptr); |
| 976 | |
| 977 | *png_ptr_ptr = NULL; |
| 978 | png_write_destroy(png_ptr); |
| 979 | png_destroy_png_struct(png_ptr); |
| 980 | } |
| 981 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 982 | } |
| 983 | |
| 984 | /* Allow the application to select one or more row filters to use. */ |
| 985 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 986 | png_set_filter(png_structrp png_ptr, int method, int filters) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 987 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 988 | png_debug(1, "in png_set_filter"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 989 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 990 | if (png_ptr == NULL) |
| 991 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 992 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 993 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 994 | if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 995 | (method == PNG_INTRAPIXEL_DIFFERENCING)) |
| 996 | method = PNG_FILTER_TYPE_BASE; |
| 997 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 998 | #endif |
| 999 | if (method == PNG_FILTER_TYPE_BASE) |
| 1000 | { |
| 1001 | switch (filters & (PNG_ALL_FILTERS | 0x07)) |
| 1002 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1003 | #ifdef PNG_WRITE_FILTER_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1004 | case 5: |
| 1005 | case 6: |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1006 | case 7: png_app_error(png_ptr, "Unknown row filter for method 0"); |
| 1007 | /* FALL THROUGH */ |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1008 | #endif /* PNG_WRITE_FILTER_SUPPORTED */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1009 | case PNG_FILTER_VALUE_NONE: |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1010 | png_ptr->do_filter = PNG_FILTER_NONE; break; |
| 1011 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1012 | #ifdef PNG_WRITE_FILTER_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1013 | case PNG_FILTER_VALUE_SUB: |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1014 | png_ptr->do_filter = PNG_FILTER_SUB; break; |
| 1015 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1016 | case PNG_FILTER_VALUE_UP: |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1017 | png_ptr->do_filter = PNG_FILTER_UP; break; |
| 1018 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1019 | case PNG_FILTER_VALUE_AVG: |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1020 | png_ptr->do_filter = PNG_FILTER_AVG; break; |
| 1021 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1022 | case PNG_FILTER_VALUE_PAETH: |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1023 | png_ptr->do_filter = PNG_FILTER_PAETH; break; |
| 1024 | |
| 1025 | default: |
| 1026 | png_ptr->do_filter = (png_byte)filters; break; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1027 | #else |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1028 | default: |
| 1029 | png_app_error(png_ptr, "Unknown row filter for method 0"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1030 | #endif /* PNG_WRITE_FILTER_SUPPORTED */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1031 | } |
| 1032 | |
| 1033 | /* If we have allocated the row_buf, this means we have already started |
| 1034 | * with the image and we should have allocated all of the filter buffers |
| 1035 | * that have been selected. If prev_row isn't already allocated, then |
| 1036 | * it is too late to start using the filters that need it, since we |
| 1037 | * will be missing the data in the previous row. If an application |
| 1038 | * wants to start and stop using particular filters during compression, |
| 1039 | * it should start out with all of the filters, and then add and |
| 1040 | * remove them after the start of compression. |
| 1041 | */ |
| 1042 | if (png_ptr->row_buf != NULL) |
| 1043 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1044 | #ifdef PNG_WRITE_FILTER_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1045 | if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL) |
| 1046 | { |
| 1047 | png_ptr->sub_row = (png_bytep)png_malloc(png_ptr, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1048 | (png_ptr->rowbytes + 1)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1049 | png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB; |
| 1050 | } |
| 1051 | |
| 1052 | if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL) |
| 1053 | { |
| 1054 | if (png_ptr->prev_row == NULL) |
| 1055 | { |
| 1056 | png_warning(png_ptr, "Can't add Up filter after starting"); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1057 | png_ptr->do_filter = (png_byte)(png_ptr->do_filter & |
| 1058 | ~PNG_FILTER_UP); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1059 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1060 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1061 | else |
| 1062 | { |
| 1063 | png_ptr->up_row = (png_bytep)png_malloc(png_ptr, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1064 | (png_ptr->rowbytes + 1)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1065 | png_ptr->up_row[0] = PNG_FILTER_VALUE_UP; |
| 1066 | } |
| 1067 | } |
| 1068 | |
| 1069 | if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL) |
| 1070 | { |
| 1071 | if (png_ptr->prev_row == NULL) |
| 1072 | { |
| 1073 | png_warning(png_ptr, "Can't add Average filter after starting"); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1074 | png_ptr->do_filter = (png_byte)(png_ptr->do_filter & |
| 1075 | ~PNG_FILTER_AVG); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1076 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1077 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1078 | else |
| 1079 | { |
| 1080 | png_ptr->avg_row = (png_bytep)png_malloc(png_ptr, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1081 | (png_ptr->rowbytes + 1)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1082 | png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG; |
| 1083 | } |
| 1084 | } |
| 1085 | |
| 1086 | if ((png_ptr->do_filter & PNG_FILTER_PAETH) && |
| 1087 | png_ptr->paeth_row == NULL) |
| 1088 | { |
| 1089 | if (png_ptr->prev_row == NULL) |
| 1090 | { |
| 1091 | png_warning(png_ptr, "Can't add Paeth filter after starting"); |
| 1092 | png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH); |
| 1093 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1094 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1095 | else |
| 1096 | { |
| 1097 | png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1098 | (png_ptr->rowbytes + 1)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1099 | png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH; |
| 1100 | } |
| 1101 | } |
| 1102 | |
| 1103 | if (png_ptr->do_filter == PNG_NO_FILTERS) |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1104 | #endif /* PNG_WRITE_FILTER_SUPPORTED */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1105 | png_ptr->do_filter = PNG_FILTER_NONE; |
| 1106 | } |
| 1107 | } |
| 1108 | else |
| 1109 | png_error(png_ptr, "Unknown custom filter method"); |
| 1110 | } |
| 1111 | |
| 1112 | /* This allows us to influence the way in which libpng chooses the "best" |
| 1113 | * filter for the current scanline. While the "minimum-sum-of-absolute- |
| 1114 | * differences metric is relatively fast and effective, there is some |
| 1115 | * question as to whether it can be improved upon by trying to keep the |
| 1116 | * filtered data going to zlib more consistent, hopefully resulting in |
| 1117 | * better compression. |
| 1118 | */ |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1119 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* GRR 970116 */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1120 | /* Convenience reset API. */ |
| 1121 | static void |
| 1122 | png_reset_filter_heuristics(png_structrp png_ptr) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1123 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1124 | /* Clear out any old values in the 'weights' - this must be done because if |
| 1125 | * the app calls set_filter_heuristics multiple times with different |
| 1126 | * 'num_weights' values we would otherwise potentially have wrong sized |
| 1127 | * arrays. |
| 1128 | */ |
| 1129 | png_ptr->num_prev_filters = 0; |
| 1130 | png_ptr->heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED; |
| 1131 | if (png_ptr->prev_filters != NULL) |
| 1132 | { |
| 1133 | png_bytep old = png_ptr->prev_filters; |
| 1134 | png_ptr->prev_filters = NULL; |
| 1135 | png_free(png_ptr, old); |
| 1136 | } |
| 1137 | if (png_ptr->filter_weights != NULL) |
| 1138 | { |
| 1139 | png_uint_16p old = png_ptr->filter_weights; |
| 1140 | png_ptr->filter_weights = NULL; |
| 1141 | png_free(png_ptr, old); |
| 1142 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1143 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1144 | if (png_ptr->inv_filter_weights != NULL) |
| 1145 | { |
| 1146 | png_uint_16p old = png_ptr->inv_filter_weights; |
| 1147 | png_ptr->inv_filter_weights = NULL; |
| 1148 | png_free(png_ptr, old); |
| 1149 | } |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1150 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1151 | /* Leave the filter_costs - this array is fixed size. */ |
| 1152 | } |
| 1153 | |
| 1154 | static int |
| 1155 | png_init_filter_heuristics(png_structrp png_ptr, int heuristic_method, |
| 1156 | int num_weights) |
| 1157 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1158 | if (png_ptr == NULL) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1159 | return 0; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1160 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1161 | /* Clear out the arrays */ |
| 1162 | png_reset_filter_heuristics(png_ptr); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1163 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1164 | /* Check arguments; the 'reset' function makes the correct settings for the |
| 1165 | * unweighted case, but we must handle the weight case by initializing the |
| 1166 | * arrays for the caller. |
| 1167 | */ |
| 1168 | if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1169 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1170 | int i; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1171 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1172 | if (num_weights > 0) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1173 | { |
| 1174 | png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1175 | (png_uint_32)((sizeof (png_byte)) * num_weights)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1176 | |
| 1177 | /* To make sure that the weighting starts out fairly */ |
| 1178 | for (i = 0; i < num_weights; i++) |
| 1179 | { |
| 1180 | png_ptr->prev_filters[i] = 255; |
| 1181 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1182 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1183 | png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1184 | (png_uint_32)((sizeof (png_uint_16)) * num_weights)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1185 | |
| 1186 | png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1187 | (png_uint_32)((sizeof (png_uint_16)) * num_weights)); |
| 1188 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1189 | for (i = 0; i < num_weights; i++) |
| 1190 | { |
| 1191 | png_ptr->inv_filter_weights[i] = |
| 1192 | png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR; |
| 1193 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1194 | |
| 1195 | /* Safe to set this now */ |
| 1196 | png_ptr->num_prev_filters = (png_byte)num_weights; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1197 | } |
| 1198 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1199 | /* If, in the future, there are other filter methods, this would |
| 1200 | * need to be based on png_ptr->filter. |
| 1201 | */ |
| 1202 | if (png_ptr->filter_costs == NULL) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1203 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1204 | png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr, |
| 1205 | (png_uint_32)((sizeof (png_uint_16)) * PNG_FILTER_VALUE_LAST)); |
| 1206 | |
| 1207 | png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr, |
| 1208 | (png_uint_32)((sizeof (png_uint_16)) * PNG_FILTER_VALUE_LAST)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1209 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1210 | |
| 1211 | for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) |
| 1212 | { |
| 1213 | png_ptr->inv_filter_costs[i] = |
| 1214 | png_ptr->filter_costs[i] = PNG_COST_FACTOR; |
| 1215 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1216 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1217 | /* All the arrays are inited, safe to set this: */ |
| 1218 | png_ptr->heuristic_method = PNG_FILTER_HEURISTIC_WEIGHTED; |
| 1219 | |
| 1220 | /* Return the 'ok' code. */ |
| 1221 | return 1; |
| 1222 | } |
| 1223 | else if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT || |
| 1224 | heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1225 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1226 | return 1; |
| 1227 | } |
| 1228 | else |
| 1229 | { |
| 1230 | png_warning(png_ptr, "Unknown filter heuristic method"); |
| 1231 | return 0; |
| 1232 | } |
| 1233 | } |
| 1234 | |
| 1235 | /* Provide floating and fixed point APIs */ |
| 1236 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 1237 | void PNGAPI |
| 1238 | png_set_filter_heuristics(png_structrp png_ptr, int heuristic_method, |
| 1239 | int num_weights, png_const_doublep filter_weights, |
| 1240 | png_const_doublep filter_costs) |
| 1241 | { |
| 1242 | png_debug(1, "in png_set_filter_heuristics"); |
| 1243 | |
| 1244 | /* The internal API allocates all the arrays and ensures that the elements of |
| 1245 | * those arrays are set to the default value. |
| 1246 | */ |
| 1247 | if (!png_init_filter_heuristics(png_ptr, heuristic_method, num_weights)) |
| 1248 | return; |
| 1249 | |
| 1250 | /* If using the weighted method copy in the weights. */ |
| 1251 | if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 1252 | { |
| 1253 | int i; |
| 1254 | for (i = 0; i < num_weights; i++) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1255 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1256 | if (filter_weights[i] <= 0.0) |
| 1257 | { |
| 1258 | png_ptr->inv_filter_weights[i] = |
| 1259 | png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR; |
| 1260 | } |
| 1261 | |
| 1262 | else |
| 1263 | { |
| 1264 | png_ptr->inv_filter_weights[i] = |
| 1265 | (png_uint_16)(PNG_WEIGHT_FACTOR*filter_weights[i]+.5); |
| 1266 | |
| 1267 | png_ptr->filter_weights[i] = |
| 1268 | (png_uint_16)(PNG_WEIGHT_FACTOR/filter_weights[i]+.5); |
| 1269 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1270 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1271 | |
| 1272 | /* Here is where we set the relative costs of the different filters. We |
| 1273 | * should take the desired compression level into account when setting |
| 1274 | * the costs, so that Paeth, for instance, has a high relative cost at low |
| 1275 | * compression levels, while it has a lower relative cost at higher |
| 1276 | * compression settings. The filter types are in order of increasing |
| 1277 | * relative cost, so it would be possible to do this with an algorithm. |
| 1278 | */ |
| 1279 | for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) if (filter_costs[i] >= 1.0) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1280 | { |
| 1281 | png_ptr->inv_filter_costs[i] = |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1282 | (png_uint_16)(PNG_COST_FACTOR / filter_costs[i] + .5); |
| 1283 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1284 | png_ptr->filter_costs[i] = |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1285 | (png_uint_16)(PNG_COST_FACTOR * filter_costs[i] + .5); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1286 | } |
| 1287 | } |
| 1288 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1289 | #endif /* FLOATING_POINT */ |
| 1290 | |
| 1291 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 1292 | void PNGAPI |
| 1293 | png_set_filter_heuristics_fixed(png_structrp png_ptr, int heuristic_method, |
| 1294 | int num_weights, png_const_fixed_point_p filter_weights, |
| 1295 | png_const_fixed_point_p filter_costs) |
| 1296 | { |
| 1297 | png_debug(1, "in png_set_filter_heuristics_fixed"); |
| 1298 | |
| 1299 | /* The internal API allocates all the arrays and ensures that the elements of |
| 1300 | * those arrays are set to the default value. |
| 1301 | */ |
| 1302 | if (!png_init_filter_heuristics(png_ptr, heuristic_method, num_weights)) |
| 1303 | return; |
| 1304 | |
| 1305 | /* If using the weighted method copy in the weights. */ |
| 1306 | if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) |
| 1307 | { |
| 1308 | int i; |
| 1309 | for (i = 0; i < num_weights; i++) |
| 1310 | { |
| 1311 | if (filter_weights[i] <= 0) |
| 1312 | { |
| 1313 | png_ptr->inv_filter_weights[i] = |
| 1314 | png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR; |
| 1315 | } |
| 1316 | |
| 1317 | else |
| 1318 | { |
| 1319 | png_ptr->inv_filter_weights[i] = (png_uint_16) |
| 1320 | ((PNG_WEIGHT_FACTOR*filter_weights[i]+PNG_FP_HALF)/PNG_FP_1); |
| 1321 | |
| 1322 | png_ptr->filter_weights[i] = (png_uint_16)((PNG_WEIGHT_FACTOR* |
| 1323 | PNG_FP_1+(filter_weights[i]/2))/filter_weights[i]); |
| 1324 | } |
| 1325 | } |
| 1326 | |
| 1327 | /* Here is where we set the relative costs of the different filters. We |
| 1328 | * should take the desired compression level into account when setting |
| 1329 | * the costs, so that Paeth, for instance, has a high relative cost at low |
| 1330 | * compression levels, while it has a lower relative cost at higher |
| 1331 | * compression settings. The filter types are in order of increasing |
| 1332 | * relative cost, so it would be possible to do this with an algorithm. |
| 1333 | */ |
| 1334 | for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) |
| 1335 | if (filter_costs[i] >= PNG_FP_1) |
| 1336 | { |
| 1337 | png_uint_32 tmp; |
| 1338 | |
| 1339 | /* Use a 32 bit unsigned temporary here because otherwise the |
| 1340 | * intermediate value will be a 32 bit *signed* integer (ANSI rules) |
| 1341 | * and this will get the wrong answer on division. |
| 1342 | */ |
| 1343 | tmp = PNG_COST_FACTOR*PNG_FP_1 + (filter_costs[i]/2); |
| 1344 | tmp /= filter_costs[i]; |
| 1345 | |
| 1346 | png_ptr->inv_filter_costs[i] = (png_uint_16)tmp; |
| 1347 | |
| 1348 | tmp = PNG_COST_FACTOR * filter_costs[i] + PNG_FP_HALF; |
| 1349 | tmp /= PNG_FP_1; |
| 1350 | |
| 1351 | png_ptr->filter_costs[i] = (png_uint_16)tmp; |
| 1352 | } |
| 1353 | } |
| 1354 | } |
| 1355 | #endif /* FIXED_POINT */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1356 | #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ |
| 1357 | |
| 1358 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1359 | png_set_compression_level(png_structrp png_ptr, int level) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1360 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1361 | png_debug(1, "in png_set_compression_level"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1362 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1363 | if (png_ptr == NULL) |
| 1364 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1365 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1366 | png_ptr->zlib_level = level; |
| 1367 | } |
| 1368 | |
| 1369 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1370 | png_set_compression_mem_level(png_structrp png_ptr, int mem_level) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1371 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1372 | png_debug(1, "in png_set_compression_mem_level"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1373 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1374 | if (png_ptr == NULL) |
| 1375 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1376 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1377 | png_ptr->zlib_mem_level = mem_level; |
| 1378 | } |
| 1379 | |
| 1380 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1381 | png_set_compression_strategy(png_structrp png_ptr, int strategy) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1382 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1383 | png_debug(1, "in png_set_compression_strategy"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1384 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1385 | if (png_ptr == NULL) |
| 1386 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1387 | |
| 1388 | /* The flag setting here prevents the libpng dynamic selection of strategy. |
| 1389 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1390 | png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY; |
| 1391 | png_ptr->zlib_strategy = strategy; |
| 1392 | } |
| 1393 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1394 | /* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a |
| 1395 | * smaller value of window_bits if it can do so safely. |
| 1396 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1397 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1398 | png_set_compression_window_bits(png_structrp png_ptr, int window_bits) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1399 | { |
| 1400 | if (png_ptr == NULL) |
| 1401 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1402 | |
| 1403 | /* Prior to 1.6.0 this would warn but then set the window_bits value, this |
| 1404 | * meant that negative window bits values could be selected which would cause |
| 1405 | * libpng to write a non-standard PNG file with raw deflate or gzip |
| 1406 | * compressed IDAT or ancillary chunks. Such files can be read and there is |
| 1407 | * no warning on read, so this seems like a very bad idea. |
| 1408 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1409 | if (window_bits > 15) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1410 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1411 | png_warning(png_ptr, "Only compression windows <= 32k supported by PNG"); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1412 | window_bits = 15; |
| 1413 | } |
| 1414 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1415 | else if (window_bits < 8) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1416 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1417 | png_warning(png_ptr, "Only compression windows >= 256 supported by PNG"); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1418 | window_bits = 8; |
| 1419 | } |
| 1420 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1421 | png_ptr->zlib_window_bits = window_bits; |
| 1422 | } |
| 1423 | |
| 1424 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1425 | png_set_compression_method(png_structrp png_ptr, int method) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1426 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1427 | png_debug(1, "in png_set_compression_method"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1428 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1429 | if (png_ptr == NULL) |
| 1430 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1431 | |
| 1432 | /* This would produce an invalid PNG file if it worked, but it doesn't and |
| 1433 | * deflate will fault it, so it is harmless to just warn here. |
| 1434 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1435 | if (method != 8) |
| 1436 | png_warning(png_ptr, "Only compression method 8 is supported by PNG"); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1437 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1438 | png_ptr->zlib_method = method; |
| 1439 | } |
| 1440 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1441 | /* The following were added to libpng-1.5.4 */ |
| 1442 | #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1443 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1444 | png_set_text_compression_level(png_structrp png_ptr, int level) |
| 1445 | { |
| 1446 | png_debug(1, "in png_set_text_compression_level"); |
| 1447 | |
| 1448 | if (png_ptr == NULL) |
| 1449 | return; |
| 1450 | |
| 1451 | png_ptr->zlib_text_level = level; |
| 1452 | } |
| 1453 | |
| 1454 | void PNGAPI |
| 1455 | png_set_text_compression_mem_level(png_structrp png_ptr, int mem_level) |
| 1456 | { |
| 1457 | png_debug(1, "in png_set_text_compression_mem_level"); |
| 1458 | |
| 1459 | if (png_ptr == NULL) |
| 1460 | return; |
| 1461 | |
| 1462 | png_ptr->zlib_text_mem_level = mem_level; |
| 1463 | } |
| 1464 | |
| 1465 | void PNGAPI |
| 1466 | png_set_text_compression_strategy(png_structrp png_ptr, int strategy) |
| 1467 | { |
| 1468 | png_debug(1, "in png_set_text_compression_strategy"); |
| 1469 | |
| 1470 | if (png_ptr == NULL) |
| 1471 | return; |
| 1472 | |
| 1473 | png_ptr->zlib_text_strategy = strategy; |
| 1474 | } |
| 1475 | |
| 1476 | /* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a |
| 1477 | * smaller value of window_bits if it can do so safely. |
| 1478 | */ |
| 1479 | void PNGAPI |
| 1480 | png_set_text_compression_window_bits(png_structrp png_ptr, int window_bits) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1481 | { |
| 1482 | if (png_ptr == NULL) |
| 1483 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1484 | |
| 1485 | if (window_bits > 15) |
| 1486 | { |
| 1487 | png_warning(png_ptr, "Only compression windows <= 32k supported by PNG"); |
| 1488 | window_bits = 15; |
| 1489 | } |
| 1490 | |
| 1491 | else if (window_bits < 8) |
| 1492 | { |
| 1493 | png_warning(png_ptr, "Only compression windows >= 256 supported by PNG"); |
| 1494 | window_bits = 8; |
| 1495 | } |
| 1496 | |
| 1497 | png_ptr->zlib_text_window_bits = window_bits; |
| 1498 | } |
| 1499 | |
| 1500 | void PNGAPI |
| 1501 | png_set_text_compression_method(png_structrp png_ptr, int method) |
| 1502 | { |
| 1503 | png_debug(1, "in png_set_text_compression_method"); |
| 1504 | |
| 1505 | if (png_ptr == NULL) |
| 1506 | return; |
| 1507 | |
| 1508 | if (method != 8) |
| 1509 | png_warning(png_ptr, "Only compression method 8 is supported by PNG"); |
| 1510 | |
| 1511 | png_ptr->zlib_text_method = method; |
| 1512 | } |
| 1513 | #endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */ |
| 1514 | /* end of API added to libpng-1.5.4 */ |
| 1515 | |
| 1516 | void PNGAPI |
| 1517 | png_set_write_status_fn(png_structrp png_ptr, png_write_status_ptr write_row_fn) |
| 1518 | { |
| 1519 | if (png_ptr == NULL) |
| 1520 | return; |
| 1521 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1522 | png_ptr->write_row_fn = write_row_fn; |
| 1523 | } |
| 1524 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1525 | #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1526 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1527 | png_set_write_user_transform_fn(png_structrp png_ptr, png_user_transform_ptr |
| 1528 | write_user_transform_fn) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1529 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1530 | png_debug(1, "in png_set_write_user_transform_fn"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1531 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1532 | if (png_ptr == NULL) |
| 1533 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1534 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1535 | png_ptr->transformations |= PNG_USER_TRANSFORM; |
| 1536 | png_ptr->write_user_transform_fn = write_user_transform_fn; |
| 1537 | } |
| 1538 | #endif |
| 1539 | |
| 1540 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1541 | #ifdef PNG_INFO_IMAGE_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1542 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1543 | png_write_png(png_structrp png_ptr, png_inforp info_ptr, |
| 1544 | int transforms, voidp params) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1545 | { |
| 1546 | if (png_ptr == NULL || info_ptr == NULL) |
| 1547 | return; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1548 | |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1549 | if ((info_ptr->valid & PNG_INFO_IDAT) == 0) |
| 1550 | { |
| 1551 | png_app_error(png_ptr, "no rows for png_write_image to write"); |
| 1552 | return; |
| 1553 | } |
| 1554 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1555 | /* Write the file header information. */ |
| 1556 | png_write_info(png_ptr, info_ptr); |
| 1557 | |
| 1558 | /* ------ these transformations don't touch the info structure ------- */ |
| 1559 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1560 | /* Invert monochrome pixels */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1561 | if (transforms & PNG_TRANSFORM_INVERT_MONO) |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1562 | #ifdef PNG_WRITE_INVERT_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1563 | png_set_invert_mono(png_ptr); |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1564 | #else |
| 1565 | png_app_error(png_ptr, "PNG_TRANSFORM_INVERT_MONO not supported"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1566 | #endif |
| 1567 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1568 | /* Shift the pixels up to a legal bit depth and fill in |
| 1569 | * as appropriate to correctly scale the image. |
| 1570 | */ |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1571 | if (transforms & PNG_TRANSFORM_SHIFT) |
| 1572 | #ifdef PNG_WRITE_SHIFT_SUPPORTED |
| 1573 | if (info_ptr->valid & PNG_INFO_sBIT) |
| 1574 | png_set_shift(png_ptr, &info_ptr->sig_bit); |
| 1575 | #else |
| 1576 | png_app_error(png_ptr, "PNG_TRANSFORM_SHIFT not supported"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1577 | #endif |
| 1578 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1579 | /* Pack pixels into bytes */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1580 | if (transforms & PNG_TRANSFORM_PACKING) |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1581 | #ifdef PNG_WRITE_PACK_SUPPORTED |
| 1582 | png_set_packing(png_ptr); |
| 1583 | #else |
| 1584 | png_app_error(png_ptr, "PNG_TRANSFORM_PACKING not supported"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1585 | #endif |
| 1586 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1587 | /* Swap location of alpha bytes from ARGB to RGBA */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1588 | if (transforms & PNG_TRANSFORM_SWAP_ALPHA) |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1589 | #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1590 | png_set_swap_alpha(png_ptr); |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1591 | #else |
| 1592 | png_app_error(png_ptr, "PNG_TRANSFORM_SWAP_ALPHA not supported"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1593 | #endif |
| 1594 | |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1595 | /* Remove a filler (X) from XRGB/RGBX/AG/GA into to convert it into |
| 1596 | * RGB, note that the code expects the input color type to be G or RGB; no |
| 1597 | * alpha channel. |
| 1598 | */ |
| 1599 | if (transforms & |
| 1600 | (PNG_TRANSFORM_STRIP_FILLER_AFTER|PNG_TRANSFORM_STRIP_FILLER_BEFORE)) |
| 1601 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1602 | #ifdef PNG_WRITE_FILLER_SUPPORTED |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1603 | if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER) |
| 1604 | { |
| 1605 | if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE) |
| 1606 | png_app_error(png_ptr, |
| 1607 | "PNG_TRANSFORM_STRIP_FILLER: BEFORE+AFTER not supported"); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1608 | |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1609 | /* Continue if ignored - this is the pre-1.6.10 behavior */ |
| 1610 | png_set_filler(png_ptr, 0, PNG_FILLER_AFTER); |
| 1611 | } |
| 1612 | |
| 1613 | else if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE) |
| 1614 | png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE); |
| 1615 | #else |
| 1616 | png_app_error(png_ptr, "PNG_TRANSFORM_STRIP_FILLER not supported"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1617 | #endif |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1618 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1619 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1620 | /* Flip BGR pixels to RGB */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1621 | if (transforms & PNG_TRANSFORM_BGR) |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1622 | #ifdef PNG_WRITE_BGR_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1623 | png_set_bgr(png_ptr); |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1624 | #else |
| 1625 | png_app_error(png_ptr, "PNG_TRANSFORM_BGR not supported"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1626 | #endif |
| 1627 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1628 | /* Swap bytes of 16-bit files to most significant byte first */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1629 | if (transforms & PNG_TRANSFORM_SWAP_ENDIAN) |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1630 | #ifdef PNG_WRITE_SWAP_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1631 | png_set_swap(png_ptr); |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1632 | #else |
| 1633 | png_app_error(png_ptr, "PNG_TRANSFORM_SWAP_ENDIAN not supported"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1634 | #endif |
| 1635 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1636 | /* Swap bits of 1, 2, 4 bit packed pixel formats */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1637 | if (transforms & PNG_TRANSFORM_PACKSWAP) |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1638 | #ifdef PNG_WRITE_PACKSWAP_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1639 | png_set_packswap(png_ptr); |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1640 | #else |
| 1641 | png_app_error(png_ptr, "PNG_TRANSFORM_PACKSWAP not supported"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1642 | #endif |
| 1643 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1644 | /* Invert the alpha channel from opacity to transparency */ |
| 1645 | if (transforms & PNG_TRANSFORM_INVERT_ALPHA) |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1646 | #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1647 | png_set_invert_alpha(png_ptr); |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1648 | #else |
| 1649 | png_app_error(png_ptr, "PNG_TRANSFORM_INVERT_ALPHA not supported"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1650 | #endif |
| 1651 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1652 | /* ----------------------- end of transformations ------------------- */ |
| 1653 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1654 | /* Write the bits */ |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1655 | png_write_image(png_ptr, info_ptr->row_pointers); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1656 | |
| 1657 | /* It is REQUIRED to call this to finish writing the rest of the file */ |
| 1658 | png_write_end(png_ptr, info_ptr); |
| 1659 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1660 | PNG_UNUSED(params) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1661 | } |
| 1662 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1663 | |
| 1664 | |
| 1665 | #ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED |
| 1666 | #ifdef PNG_STDIO_SUPPORTED /* currently required for png_image_write_* */ |
| 1667 | /* Initialize the write structure - general purpose utility. */ |
| 1668 | static int |
| 1669 | png_image_write_init(png_imagep image) |
| 1670 | { |
| 1671 | png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, image, |
| 1672 | png_safe_error, png_safe_warning); |
| 1673 | |
| 1674 | if (png_ptr != NULL) |
| 1675 | { |
| 1676 | png_infop info_ptr = png_create_info_struct(png_ptr); |
| 1677 | |
| 1678 | if (info_ptr != NULL) |
| 1679 | { |
| 1680 | png_controlp control = png_voidcast(png_controlp, |
| 1681 | png_malloc_warn(png_ptr, (sizeof *control))); |
| 1682 | |
| 1683 | if (control != NULL) |
| 1684 | { |
| 1685 | memset(control, 0, (sizeof *control)); |
| 1686 | |
| 1687 | control->png_ptr = png_ptr; |
| 1688 | control->info_ptr = info_ptr; |
| 1689 | control->for_write = 1; |
| 1690 | |
| 1691 | image->opaque = control; |
| 1692 | return 1; |
| 1693 | } |
| 1694 | |
| 1695 | /* Error clean up */ |
| 1696 | png_destroy_info_struct(png_ptr, &info_ptr); |
| 1697 | } |
| 1698 | |
| 1699 | png_destroy_write_struct(&png_ptr, NULL); |
| 1700 | } |
| 1701 | |
| 1702 | return png_image_error(image, "png_image_write_: out of memory"); |
| 1703 | } |
| 1704 | |
| 1705 | /* Arguments to png_image_write_main: */ |
| 1706 | typedef struct |
| 1707 | { |
| 1708 | /* Arguments: */ |
| 1709 | png_imagep image; |
| 1710 | png_const_voidp buffer; |
| 1711 | png_int_32 row_stride; |
| 1712 | png_const_voidp colormap; |
| 1713 | int convert_to_8bit; |
| 1714 | /* Local variables: */ |
| 1715 | png_const_voidp first_row; |
| 1716 | ptrdiff_t row_bytes; |
| 1717 | png_voidp local_row; |
| 1718 | } png_image_write_control; |
| 1719 | |
| 1720 | /* Write png_uint_16 input to a 16-bit PNG; the png_ptr has already been set to |
| 1721 | * do any necessary byte swapping. The component order is defined by the |
| 1722 | * png_image format value. |
| 1723 | */ |
| 1724 | static int |
| 1725 | png_write_image_16bit(png_voidp argument) |
| 1726 | { |
| 1727 | png_image_write_control *display = png_voidcast(png_image_write_control*, |
| 1728 | argument); |
| 1729 | png_imagep image = display->image; |
| 1730 | png_structrp png_ptr = image->opaque->png_ptr; |
| 1731 | |
| 1732 | png_const_uint_16p input_row = png_voidcast(png_const_uint_16p, |
| 1733 | display->first_row); |
| 1734 | png_uint_16p output_row = png_voidcast(png_uint_16p, display->local_row); |
| 1735 | png_uint_16p row_end; |
| 1736 | const int channels = (image->format & PNG_FORMAT_FLAG_COLOR) ? 3 : 1; |
| 1737 | int aindex = 0; |
| 1738 | png_uint_32 y = image->height; |
| 1739 | |
| 1740 | if (image->format & PNG_FORMAT_FLAG_ALPHA) |
| 1741 | { |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1742 | # ifdef PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED |
| 1743 | if (image->format & PNG_FORMAT_FLAG_AFIRST) |
| 1744 | { |
| 1745 | aindex = -1; |
| 1746 | ++input_row; /* To point to the first component */ |
| 1747 | ++output_row; |
| 1748 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1749 | |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1750 | else |
| 1751 | # endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1752 | aindex = channels; |
| 1753 | } |
| 1754 | |
| 1755 | else |
| 1756 | png_error(png_ptr, "png_write_image: internal call error"); |
| 1757 | |
| 1758 | /* Work out the output row end and count over this, note that the increment |
| 1759 | * above to 'row' means that row_end can actually be beyond the end of the |
| 1760 | * row; this is correct. |
| 1761 | */ |
| 1762 | row_end = output_row + image->width * (channels+1); |
| 1763 | |
| 1764 | while (y-- > 0) |
| 1765 | { |
| 1766 | png_const_uint_16p in_ptr = input_row; |
| 1767 | png_uint_16p out_ptr = output_row; |
| 1768 | |
| 1769 | while (out_ptr < row_end) |
| 1770 | { |
| 1771 | const png_uint_16 alpha = in_ptr[aindex]; |
| 1772 | png_uint_32 reciprocal = 0; |
| 1773 | int c; |
| 1774 | |
| 1775 | out_ptr[aindex] = alpha; |
| 1776 | |
| 1777 | /* Calculate a reciprocal. The correct calculation is simply |
| 1778 | * component/alpha*65535 << 15. (I.e. 15 bits of precision); this |
| 1779 | * allows correct rounding by adding .5 before the shift. 'reciprocal' |
| 1780 | * is only initialized when required. |
| 1781 | */ |
| 1782 | if (alpha > 0 && alpha < 65535) |
| 1783 | reciprocal = ((0xffff<<15)+(alpha>>1))/alpha; |
| 1784 | |
| 1785 | c = channels; |
| 1786 | do /* always at least one channel */ |
| 1787 | { |
| 1788 | png_uint_16 component = *in_ptr++; |
| 1789 | |
| 1790 | /* The following gives 65535 for an alpha of 0, which is fine, |
| 1791 | * otherwise if 0/0 is represented as some other value there is more |
| 1792 | * likely to be a discontinuity which will probably damage |
| 1793 | * compression when moving from a fully transparent area to a |
| 1794 | * nearly transparent one. (The assumption here is that opaque |
| 1795 | * areas tend not to be 0 intensity.) |
| 1796 | */ |
| 1797 | if (component >= alpha) |
| 1798 | component = 65535; |
| 1799 | |
| 1800 | /* component<alpha, so component/alpha is less than one and |
| 1801 | * component*reciprocal is less than 2^31. |
| 1802 | */ |
| 1803 | else if (component > 0 && alpha < 65535) |
| 1804 | { |
| 1805 | png_uint_32 calc = component * reciprocal; |
| 1806 | calc += 16384; /* round to nearest */ |
| 1807 | component = (png_uint_16)(calc >> 15); |
| 1808 | } |
| 1809 | |
| 1810 | *out_ptr++ = component; |
| 1811 | } |
| 1812 | while (--c > 0); |
| 1813 | |
| 1814 | /* Skip to next component (skip the intervening alpha channel) */ |
| 1815 | ++in_ptr; |
| 1816 | ++out_ptr; |
| 1817 | } |
| 1818 | |
| 1819 | png_write_row(png_ptr, png_voidcast(png_const_bytep, display->local_row)); |
| 1820 | input_row += display->row_bytes/(sizeof (png_uint_16)); |
| 1821 | } |
| 1822 | |
| 1823 | return 1; |
| 1824 | } |
| 1825 | |
| 1826 | /* Given 16-bit input (1 to 4 channels) write 8-bit output. If an alpha channel |
| 1827 | * is present it must be removed from the components, the components are then |
| 1828 | * written in sRGB encoding. No components are added or removed. |
| 1829 | * |
| 1830 | * Calculate an alpha reciprocal to reverse pre-multiplication. As above the |
| 1831 | * calculation can be done to 15 bits of accuracy; however, the output needs to |
| 1832 | * be scaled in the range 0..255*65535, so include that scaling here. |
| 1833 | */ |
| 1834 | #define UNP_RECIPROCAL(alpha) ((((0xffff*0xff)<<7)+(alpha>>1))/alpha) |
| 1835 | |
| 1836 | static png_byte |
| 1837 | png_unpremultiply(png_uint_32 component, png_uint_32 alpha, |
| 1838 | png_uint_32 reciprocal/*from the above macro*/) |
| 1839 | { |
| 1840 | /* The following gives 1.0 for an alpha of 0, which is fine, otherwise if 0/0 |
| 1841 | * is represented as some other value there is more likely to be a |
| 1842 | * discontinuity which will probably damage compression when moving from a |
| 1843 | * fully transparent area to a nearly transparent one. (The assumption here |
| 1844 | * is that opaque areas tend not to be 0 intensity.) |
| 1845 | * |
| 1846 | * There is a rounding problem here; if alpha is less than 128 it will end up |
| 1847 | * as 0 when scaled to 8 bits. To avoid introducing spurious colors into the |
| 1848 | * output change for this too. |
| 1849 | */ |
| 1850 | if (component >= alpha || alpha < 128) |
| 1851 | return 255; |
| 1852 | |
| 1853 | /* component<alpha, so component/alpha is less than one and |
| 1854 | * component*reciprocal is less than 2^31. |
| 1855 | */ |
| 1856 | else if (component > 0) |
| 1857 | { |
| 1858 | /* The test is that alpha/257 (rounded) is less than 255, the first value |
| 1859 | * that becomes 255 is 65407. |
| 1860 | * NOTE: this must agree with the PNG_DIV257 macro (which must, therefore, |
| 1861 | * be exact!) [Could also test reciprocal != 0] |
| 1862 | */ |
| 1863 | if (alpha < 65407) |
| 1864 | { |
| 1865 | component *= reciprocal; |
| 1866 | component += 64; /* round to nearest */ |
| 1867 | component >>= 7; |
| 1868 | } |
| 1869 | |
| 1870 | else |
| 1871 | component *= 255; |
| 1872 | |
| 1873 | /* Convert the component to sRGB. */ |
| 1874 | return (png_byte)PNG_sRGB_FROM_LINEAR(component); |
| 1875 | } |
| 1876 | |
| 1877 | else |
| 1878 | return 0; |
| 1879 | } |
| 1880 | |
| 1881 | static int |
| 1882 | png_write_image_8bit(png_voidp argument) |
| 1883 | { |
| 1884 | png_image_write_control *display = png_voidcast(png_image_write_control*, |
| 1885 | argument); |
| 1886 | png_imagep image = display->image; |
| 1887 | png_structrp png_ptr = image->opaque->png_ptr; |
| 1888 | |
| 1889 | png_const_uint_16p input_row = png_voidcast(png_const_uint_16p, |
| 1890 | display->first_row); |
| 1891 | png_bytep output_row = png_voidcast(png_bytep, display->local_row); |
| 1892 | png_uint_32 y = image->height; |
| 1893 | const int channels = (image->format & PNG_FORMAT_FLAG_COLOR) ? 3 : 1; |
| 1894 | |
| 1895 | if (image->format & PNG_FORMAT_FLAG_ALPHA) |
| 1896 | { |
| 1897 | png_bytep row_end; |
| 1898 | int aindex; |
| 1899 | |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1900 | # ifdef PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED |
| 1901 | if (image->format & PNG_FORMAT_FLAG_AFIRST) |
| 1902 | { |
| 1903 | aindex = -1; |
| 1904 | ++input_row; /* To point to the first component */ |
| 1905 | ++output_row; |
| 1906 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1907 | |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1908 | else |
| 1909 | # endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1910 | aindex = channels; |
| 1911 | |
| 1912 | /* Use row_end in place of a loop counter: */ |
| 1913 | row_end = output_row + image->width * (channels+1); |
| 1914 | |
| 1915 | while (y-- > 0) |
| 1916 | { |
| 1917 | png_const_uint_16p in_ptr = input_row; |
| 1918 | png_bytep out_ptr = output_row; |
| 1919 | |
| 1920 | while (out_ptr < row_end) |
| 1921 | { |
| 1922 | png_uint_16 alpha = in_ptr[aindex]; |
| 1923 | png_byte alphabyte = (png_byte)PNG_DIV257(alpha); |
| 1924 | png_uint_32 reciprocal = 0; |
| 1925 | int c; |
| 1926 | |
| 1927 | /* Scale and write the alpha channel. */ |
| 1928 | out_ptr[aindex] = alphabyte; |
| 1929 | |
| 1930 | if (alphabyte > 0 && alphabyte < 255) |
| 1931 | reciprocal = UNP_RECIPROCAL(alpha); |
| 1932 | |
| 1933 | c = channels; |
| 1934 | do /* always at least one channel */ |
| 1935 | *out_ptr++ = png_unpremultiply(*in_ptr++, alpha, reciprocal); |
| 1936 | while (--c > 0); |
| 1937 | |
| 1938 | /* Skip to next component (skip the intervening alpha channel) */ |
| 1939 | ++in_ptr; |
| 1940 | ++out_ptr; |
| 1941 | } /* while out_ptr < row_end */ |
| 1942 | |
| 1943 | png_write_row(png_ptr, png_voidcast(png_const_bytep, |
| 1944 | display->local_row)); |
| 1945 | input_row += display->row_bytes/(sizeof (png_uint_16)); |
| 1946 | } /* while y */ |
| 1947 | } |
| 1948 | |
| 1949 | else |
| 1950 | { |
| 1951 | /* No alpha channel, so the row_end really is the end of the row and it |
| 1952 | * is sufficient to loop over the components one by one. |
| 1953 | */ |
| 1954 | png_bytep row_end = output_row + image->width * channels; |
| 1955 | |
| 1956 | while (y-- > 0) |
| 1957 | { |
| 1958 | png_const_uint_16p in_ptr = input_row; |
| 1959 | png_bytep out_ptr = output_row; |
| 1960 | |
| 1961 | while (out_ptr < row_end) |
| 1962 | { |
| 1963 | png_uint_32 component = *in_ptr++; |
| 1964 | |
| 1965 | component *= 255; |
| 1966 | *out_ptr++ = (png_byte)PNG_sRGB_FROM_LINEAR(component); |
| 1967 | } |
| 1968 | |
| 1969 | png_write_row(png_ptr, output_row); |
| 1970 | input_row += display->row_bytes/(sizeof (png_uint_16)); |
| 1971 | } |
| 1972 | } |
| 1973 | |
| 1974 | return 1; |
| 1975 | } |
| 1976 | |
| 1977 | static void |
| 1978 | png_image_set_PLTE(png_image_write_control *display) |
| 1979 | { |
| 1980 | const png_imagep image = display->image; |
| 1981 | const void *cmap = display->colormap; |
| 1982 | const int entries = image->colormap_entries > 256 ? 256 : |
| 1983 | (int)image->colormap_entries; |
| 1984 | |
| 1985 | /* NOTE: the caller must check for cmap != NULL and entries != 0 */ |
| 1986 | const png_uint_32 format = image->format; |
| 1987 | const int channels = PNG_IMAGE_SAMPLE_CHANNELS(format); |
| 1988 | |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 1989 | # if defined(PNG_FORMAT_BGR_SUPPORTED) &&\ |
| 1990 | defined(PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1991 | const int afirst = (format & PNG_FORMAT_FLAG_AFIRST) != 0 && |
| 1992 | (format & PNG_FORMAT_FLAG_ALPHA) != 0; |
| 1993 | # else |
| 1994 | # define afirst 0 |
| 1995 | # endif |
| 1996 | |
| 1997 | # ifdef PNG_FORMAT_BGR_SUPPORTED |
| 1998 | const int bgr = (format & PNG_FORMAT_FLAG_BGR) ? 2 : 0; |
| 1999 | # else |
| 2000 | # define bgr 0 |
| 2001 | # endif |
| 2002 | |
| 2003 | int i, num_trans; |
| 2004 | png_color palette[256]; |
| 2005 | png_byte tRNS[256]; |
| 2006 | |
| 2007 | memset(tRNS, 255, (sizeof tRNS)); |
| 2008 | memset(palette, 0, (sizeof palette)); |
| 2009 | |
| 2010 | for (i=num_trans=0; i<entries; ++i) |
| 2011 | { |
| 2012 | /* This gets automatically converted to sRGB with reversal of the |
| 2013 | * pre-multiplication if the color-map has an alpha channel. |
| 2014 | */ |
| 2015 | if (format & PNG_FORMAT_FLAG_LINEAR) |
| 2016 | { |
| 2017 | png_const_uint_16p entry = png_voidcast(png_const_uint_16p, cmap); |
| 2018 | |
| 2019 | entry += i * channels; |
| 2020 | |
| 2021 | if (channels & 1) /* no alpha */ |
| 2022 | { |
| 2023 | if (channels >= 3) /* RGB */ |
| 2024 | { |
| 2025 | palette[i].blue = (png_byte)PNG_sRGB_FROM_LINEAR(255 * |
| 2026 | entry[(2 ^ bgr)]); |
| 2027 | palette[i].green = (png_byte)PNG_sRGB_FROM_LINEAR(255 * |
| 2028 | entry[1]); |
| 2029 | palette[i].red = (png_byte)PNG_sRGB_FROM_LINEAR(255 * |
| 2030 | entry[bgr]); |
| 2031 | } |
| 2032 | |
| 2033 | else /* Gray */ |
| 2034 | palette[i].blue = palette[i].red = palette[i].green = |
| 2035 | (png_byte)PNG_sRGB_FROM_LINEAR(255 * *entry); |
| 2036 | } |
| 2037 | |
| 2038 | else /* alpha */ |
| 2039 | { |
| 2040 | png_uint_16 alpha = entry[afirst ? 0 : channels-1]; |
| 2041 | png_byte alphabyte = (png_byte)PNG_DIV257(alpha); |
| 2042 | png_uint_32 reciprocal = 0; |
| 2043 | |
| 2044 | /* Calculate a reciprocal, as in the png_write_image_8bit code above |
| 2045 | * this is designed to produce a value scaled to 255*65535 when |
| 2046 | * divided by 128 (i.e. asr 7). |
| 2047 | */ |
| 2048 | if (alphabyte > 0 && alphabyte < 255) |
| 2049 | reciprocal = (((0xffff*0xff)<<7)+(alpha>>1))/alpha; |
| 2050 | |
| 2051 | tRNS[i] = alphabyte; |
| 2052 | if (alphabyte < 255) |
| 2053 | num_trans = i+1; |
| 2054 | |
| 2055 | if (channels >= 3) /* RGB */ |
| 2056 | { |
| 2057 | palette[i].blue = png_unpremultiply(entry[afirst + (2 ^ bgr)], |
| 2058 | alpha, reciprocal); |
| 2059 | palette[i].green = png_unpremultiply(entry[afirst + 1], alpha, |
| 2060 | reciprocal); |
| 2061 | palette[i].red = png_unpremultiply(entry[afirst + bgr], alpha, |
| 2062 | reciprocal); |
| 2063 | } |
| 2064 | |
| 2065 | else /* gray */ |
| 2066 | palette[i].blue = palette[i].red = palette[i].green = |
| 2067 | png_unpremultiply(entry[afirst], alpha, reciprocal); |
| 2068 | } |
| 2069 | } |
| 2070 | |
| 2071 | else /* Color-map has sRGB values */ |
| 2072 | { |
| 2073 | png_const_bytep entry = png_voidcast(png_const_bytep, cmap); |
| 2074 | |
| 2075 | entry += i * channels; |
| 2076 | |
| 2077 | switch (channels) |
| 2078 | { |
| 2079 | case 4: |
| 2080 | tRNS[i] = entry[afirst ? 0 : 3]; |
| 2081 | if (tRNS[i] < 255) |
| 2082 | num_trans = i+1; |
| 2083 | /* FALL THROUGH */ |
| 2084 | case 3: |
| 2085 | palette[i].blue = entry[afirst + (2 ^ bgr)]; |
| 2086 | palette[i].green = entry[afirst + 1]; |
| 2087 | palette[i].red = entry[afirst + bgr]; |
| 2088 | break; |
| 2089 | |
| 2090 | case 2: |
| 2091 | tRNS[i] = entry[1 ^ afirst]; |
| 2092 | if (tRNS[i] < 255) |
| 2093 | num_trans = i+1; |
| 2094 | /* FALL THROUGH */ |
| 2095 | case 1: |
| 2096 | palette[i].blue = palette[i].red = palette[i].green = |
| 2097 | entry[afirst]; |
| 2098 | break; |
| 2099 | |
| 2100 | default: |
| 2101 | break; |
| 2102 | } |
| 2103 | } |
| 2104 | } |
| 2105 | |
| 2106 | # ifdef afirst |
| 2107 | # undef afirst |
| 2108 | # endif |
| 2109 | # ifdef bgr |
| 2110 | # undef bgr |
| 2111 | # endif |
| 2112 | |
| 2113 | png_set_PLTE(image->opaque->png_ptr, image->opaque->info_ptr, palette, |
| 2114 | entries); |
| 2115 | |
| 2116 | if (num_trans > 0) |
| 2117 | png_set_tRNS(image->opaque->png_ptr, image->opaque->info_ptr, tRNS, |
| 2118 | num_trans, NULL); |
| 2119 | |
| 2120 | image->colormap_entries = entries; |
| 2121 | } |
| 2122 | |
| 2123 | static int |
| 2124 | png_image_write_main(png_voidp argument) |
| 2125 | { |
| 2126 | png_image_write_control *display = png_voidcast(png_image_write_control*, |
| 2127 | argument); |
| 2128 | png_imagep image = display->image; |
| 2129 | png_structrp png_ptr = image->opaque->png_ptr; |
| 2130 | png_inforp info_ptr = image->opaque->info_ptr; |
| 2131 | png_uint_32 format = image->format; |
| 2132 | |
| 2133 | int colormap = (format & PNG_FORMAT_FLAG_COLORMAP) != 0; |
| 2134 | int linear = !colormap && (format & PNG_FORMAT_FLAG_LINEAR) != 0; /* input */ |
| 2135 | int alpha = !colormap && (format & PNG_FORMAT_FLAG_ALPHA) != 0; |
| 2136 | int write_16bit = linear && !colormap && !display->convert_to_8bit; |
| 2137 | |
| 2138 | # ifdef PNG_BENIGN_ERRORS_SUPPORTED |
| 2139 | /* Make sure we error out on any bad situation */ |
| 2140 | png_set_benign_errors(png_ptr, 0/*error*/); |
| 2141 | # endif |
| 2142 | |
| 2143 | /* Default the 'row_stride' parameter if required. */ |
| 2144 | if (display->row_stride == 0) |
| 2145 | display->row_stride = PNG_IMAGE_ROW_STRIDE(*image); |
| 2146 | |
| 2147 | /* Set the required transforms then write the rows in the correct order. */ |
| 2148 | if (format & PNG_FORMAT_FLAG_COLORMAP) |
| 2149 | { |
| 2150 | if (display->colormap != NULL && image->colormap_entries > 0) |
| 2151 | { |
| 2152 | png_uint_32 entries = image->colormap_entries; |
| 2153 | |
| 2154 | png_set_IHDR(png_ptr, info_ptr, image->width, image->height, |
| 2155 | entries > 16 ? 8 : (entries > 4 ? 4 : (entries > 2 ? 2 : 1)), |
| 2156 | PNG_COLOR_TYPE_PALETTE, PNG_INTERLACE_NONE, |
| 2157 | PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); |
| 2158 | |
| 2159 | png_image_set_PLTE(display); |
| 2160 | } |
| 2161 | |
| 2162 | else |
| 2163 | png_error(image->opaque->png_ptr, |
| 2164 | "no color-map for color-mapped image"); |
| 2165 | } |
| 2166 | |
| 2167 | else |
| 2168 | png_set_IHDR(png_ptr, info_ptr, image->width, image->height, |
| 2169 | write_16bit ? 16 : 8, |
| 2170 | ((format & PNG_FORMAT_FLAG_COLOR) ? PNG_COLOR_MASK_COLOR : 0) + |
| 2171 | ((format & PNG_FORMAT_FLAG_ALPHA) ? PNG_COLOR_MASK_ALPHA : 0), |
| 2172 | PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); |
| 2173 | |
| 2174 | /* Counter-intuitively the data transformations must be called *after* |
| 2175 | * png_write_info, not before as in the read code, but the 'set' functions |
| 2176 | * must still be called before. Just set the color space information, never |
| 2177 | * write an interlaced image. |
| 2178 | */ |
| 2179 | |
| 2180 | if (write_16bit) |
| 2181 | { |
| 2182 | /* The gamma here is 1.0 (linear) and the cHRM chunk matches sRGB. */ |
| 2183 | png_set_gAMA_fixed(png_ptr, info_ptr, PNG_GAMMA_LINEAR); |
| 2184 | |
| 2185 | if (!(image->flags & PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB)) |
| 2186 | png_set_cHRM_fixed(png_ptr, info_ptr, |
| 2187 | /* color x y */ |
| 2188 | /* white */ 31270, 32900, |
| 2189 | /* red */ 64000, 33000, |
| 2190 | /* green */ 30000, 60000, |
| 2191 | /* blue */ 15000, 6000 |
| 2192 | ); |
| 2193 | } |
| 2194 | |
| 2195 | else if (!(image->flags & PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB)) |
| 2196 | png_set_sRGB(png_ptr, info_ptr, PNG_sRGB_INTENT_PERCEPTUAL); |
| 2197 | |
| 2198 | /* Else writing an 8-bit file and the *colors* aren't sRGB, but the 8-bit |
| 2199 | * space must still be gamma encoded. |
| 2200 | */ |
| 2201 | else |
| 2202 | png_set_gAMA_fixed(png_ptr, info_ptr, PNG_GAMMA_sRGB_INVERSE); |
| 2203 | |
| 2204 | /* Write the file header. */ |
| 2205 | png_write_info(png_ptr, info_ptr); |
| 2206 | |
| 2207 | /* Now set up the data transformations (*after* the header is written), |
| 2208 | * remove the handled transformations from the 'format' flags for checking. |
| 2209 | * |
| 2210 | * First check for a little endian system if writing 16 bit files. |
| 2211 | */ |
| 2212 | if (write_16bit) |
| 2213 | { |
| 2214 | PNG_CONST png_uint_16 le = 0x0001; |
| 2215 | |
| 2216 | if (*(png_const_bytep)&le) |
| 2217 | png_set_swap(png_ptr); |
| 2218 | } |
| 2219 | |
| 2220 | # ifdef PNG_SIMPLIFIED_WRITE_BGR_SUPPORTED |
| 2221 | if (format & PNG_FORMAT_FLAG_BGR) |
| 2222 | { |
| 2223 | if (!colormap && (format & PNG_FORMAT_FLAG_COLOR) != 0) |
| 2224 | png_set_bgr(png_ptr); |
| 2225 | format &= ~PNG_FORMAT_FLAG_BGR; |
| 2226 | } |
| 2227 | # endif |
| 2228 | |
| 2229 | # ifdef PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED |
| 2230 | if (format & PNG_FORMAT_FLAG_AFIRST) |
| 2231 | { |
| 2232 | if (!colormap && (format & PNG_FORMAT_FLAG_ALPHA) != 0) |
| 2233 | png_set_swap_alpha(png_ptr); |
| 2234 | format &= ~PNG_FORMAT_FLAG_AFIRST; |
| 2235 | } |
| 2236 | # endif |
| 2237 | |
| 2238 | /* If there are 16 or fewer color-map entries we wrote a lower bit depth |
| 2239 | * above, but the application data is still byte packed. |
| 2240 | */ |
| 2241 | if (colormap && image->colormap_entries <= 16) |
| 2242 | png_set_packing(png_ptr); |
| 2243 | |
| 2244 | /* That should have handled all (both) the transforms. */ |
| 2245 | if ((format & ~(png_uint_32)(PNG_FORMAT_FLAG_COLOR | PNG_FORMAT_FLAG_LINEAR | |
| 2246 | PNG_FORMAT_FLAG_ALPHA | PNG_FORMAT_FLAG_COLORMAP)) != 0) |
| 2247 | png_error(png_ptr, "png_write_image: unsupported transformation"); |
| 2248 | |
| 2249 | { |
| 2250 | png_const_bytep row = png_voidcast(png_const_bytep, display->buffer); |
| 2251 | ptrdiff_t row_bytes = display->row_stride; |
| 2252 | |
| 2253 | if (linear) |
| 2254 | row_bytes *= (sizeof (png_uint_16)); |
| 2255 | |
| 2256 | if (row_bytes < 0) |
| 2257 | row += (image->height-1) * (-row_bytes); |
| 2258 | |
| 2259 | display->first_row = row; |
| 2260 | display->row_bytes = row_bytes; |
| 2261 | } |
| 2262 | |
| 2263 | /* Apply 'fast' options if the flag is set. */ |
| 2264 | if ((image->flags & PNG_IMAGE_FLAG_FAST) != 0) |
| 2265 | { |
| 2266 | png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, PNG_NO_FILTERS); |
| 2267 | /* NOTE: determined by experiment using pngstest, this reflects some |
| 2268 | * balance between the time to write the image once and the time to read |
| 2269 | * it about 50 times. The speed-up in pngstest was about 10-20% of the |
| 2270 | * total (user) time on a heavily loaded system. |
| 2271 | */ |
| 2272 | png_set_compression_level(png_ptr, 3); |
| 2273 | } |
| 2274 | |
| 2275 | /* Check for the cases that currently require a pre-transform on the row |
| 2276 | * before it is written. This only applies when the input is 16-bit and |
| 2277 | * either there is an alpha channel or it is converted to 8-bit. |
| 2278 | */ |
| 2279 | if ((linear && alpha) || (!colormap && display->convert_to_8bit)) |
| 2280 | { |
| 2281 | png_bytep row = png_voidcast(png_bytep, png_malloc(png_ptr, |
| 2282 | png_get_rowbytes(png_ptr, info_ptr))); |
| 2283 | int result; |
| 2284 | |
| 2285 | display->local_row = row; |
| 2286 | if (write_16bit) |
| 2287 | result = png_safe_execute(image, png_write_image_16bit, display); |
| 2288 | else |
| 2289 | result = png_safe_execute(image, png_write_image_8bit, display); |
| 2290 | display->local_row = NULL; |
| 2291 | |
| 2292 | png_free(png_ptr, row); |
| 2293 | |
| 2294 | /* Skip the 'write_end' on error: */ |
| 2295 | if (!result) |
| 2296 | return 0; |
| 2297 | } |
| 2298 | |
| 2299 | /* Otherwise this is the case where the input is in a format currently |
| 2300 | * supported by the rest of the libpng write code; call it directly. |
| 2301 | */ |
| 2302 | else |
| 2303 | { |
| 2304 | png_const_bytep row = png_voidcast(png_const_bytep, display->first_row); |
| 2305 | ptrdiff_t row_bytes = display->row_bytes; |
| 2306 | png_uint_32 y = image->height; |
| 2307 | |
| 2308 | while (y-- > 0) |
| 2309 | { |
| 2310 | png_write_row(png_ptr, row); |
| 2311 | row += row_bytes; |
| 2312 | } |
| 2313 | } |
| 2314 | |
| 2315 | png_write_end(png_ptr, info_ptr); |
| 2316 | return 1; |
| 2317 | } |
| 2318 | |
| 2319 | int PNGAPI |
| 2320 | png_image_write_to_stdio(png_imagep image, FILE *file, int convert_to_8bit, |
| 2321 | const void *buffer, png_int_32 row_stride, const void *colormap) |
| 2322 | { |
| 2323 | /* Write the image to the given (FILE*). */ |
| 2324 | if (image != NULL && image->version == PNG_IMAGE_VERSION) |
| 2325 | { |
| 2326 | if (file != NULL) |
| 2327 | { |
| 2328 | if (png_image_write_init(image)) |
| 2329 | { |
| 2330 | png_image_write_control display; |
| 2331 | int result; |
| 2332 | |
| 2333 | /* This is slightly evil, but png_init_io doesn't do anything other |
| 2334 | * than this and we haven't changed the standard IO functions so |
| 2335 | * this saves a 'safe' function. |
| 2336 | */ |
| 2337 | image->opaque->png_ptr->io_ptr = file; |
| 2338 | |
| 2339 | memset(&display, 0, (sizeof display)); |
| 2340 | display.image = image; |
| 2341 | display.buffer = buffer; |
| 2342 | display.row_stride = row_stride; |
| 2343 | display.colormap = colormap; |
| 2344 | display.convert_to_8bit = convert_to_8bit; |
| 2345 | |
| 2346 | result = png_safe_execute(image, png_image_write_main, &display); |
| 2347 | png_image_free(image); |
| 2348 | return result; |
| 2349 | } |
| 2350 | |
| 2351 | else |
| 2352 | return 0; |
| 2353 | } |
| 2354 | |
| 2355 | else |
| 2356 | return png_image_error(image, |
| 2357 | "png_image_write_to_stdio: invalid argument"); |
| 2358 | } |
| 2359 | |
| 2360 | else if (image != NULL) |
| 2361 | return png_image_error(image, |
| 2362 | "png_image_write_to_stdio: incorrect PNG_IMAGE_VERSION"); |
| 2363 | |
| 2364 | else |
| 2365 | return 0; |
| 2366 | } |
| 2367 | |
| 2368 | int PNGAPI |
| 2369 | png_image_write_to_file(png_imagep image, const char *file_name, |
| 2370 | int convert_to_8bit, const void *buffer, png_int_32 row_stride, |
| 2371 | const void *colormap) |
| 2372 | { |
| 2373 | /* Write the image to the named file. */ |
| 2374 | if (image != NULL && image->version == PNG_IMAGE_VERSION) |
| 2375 | { |
| 2376 | if (file_name != NULL) |
| 2377 | { |
| 2378 | FILE *fp = fopen(file_name, "wb"); |
| 2379 | |
| 2380 | if (fp != NULL) |
| 2381 | { |
| 2382 | if (png_image_write_to_stdio(image, fp, convert_to_8bit, buffer, |
| 2383 | row_stride, colormap)) |
| 2384 | { |
| 2385 | int error; /* from fflush/fclose */ |
| 2386 | |
| 2387 | /* Make sure the file is flushed correctly. */ |
| 2388 | if (fflush(fp) == 0 && ferror(fp) == 0) |
| 2389 | { |
| 2390 | if (fclose(fp) == 0) |
| 2391 | return 1; |
| 2392 | |
| 2393 | error = errno; /* from fclose */ |
| 2394 | } |
| 2395 | |
| 2396 | else |
| 2397 | { |
| 2398 | error = errno; /* from fflush or ferror */ |
| 2399 | (void)fclose(fp); |
| 2400 | } |
| 2401 | |
| 2402 | (void)remove(file_name); |
| 2403 | /* The image has already been cleaned up; this is just used to |
| 2404 | * set the error (because the original write succeeded). |
| 2405 | */ |
| 2406 | return png_image_error(image, strerror(error)); |
| 2407 | } |
| 2408 | |
| 2409 | else |
| 2410 | { |
| 2411 | /* Clean up: just the opened file. */ |
| 2412 | (void)fclose(fp); |
| 2413 | (void)remove(file_name); |
| 2414 | return 0; |
| 2415 | } |
| 2416 | } |
| 2417 | |
| 2418 | else |
| 2419 | return png_image_error(image, strerror(errno)); |
| 2420 | } |
| 2421 | |
| 2422 | else |
| 2423 | return png_image_error(image, |
| 2424 | "png_image_write_to_file: invalid argument"); |
| 2425 | } |
| 2426 | |
| 2427 | else if (image != NULL) |
| 2428 | return png_image_error(image, |
| 2429 | "png_image_write_to_file: incorrect PNG_IMAGE_VERSION"); |
| 2430 | |
| 2431 | else |
| 2432 | return 0; |
| 2433 | } |
| 2434 | #endif /* PNG_STDIO_SUPPORTED */ |
| 2435 | #endif /* SIMPLIFIED_WRITE */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2436 | #endif /* PNG_WRITE_SUPPORTED */ |