scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2015 Google Inc. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
msarett | 7411438 | 2015-03-16 11:55:18 -0700 | [diff] [blame] | 8 | #include "SkCodecPriv.h" |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 9 | #include "SkColorPriv.h" |
| 10 | #include "SkColorTable.h" |
| 11 | #include "SkBitmap.h" |
| 12 | #include "SkMath.h" |
msarett | be1d555 | 2016-01-21 09:05:23 -0800 | [diff] [blame] | 13 | #include "SkPngCodec.h" |
mtklein | 372d65c | 2016-01-27 13:01:41 -0800 | [diff] [blame^] | 14 | #include "SkPngFilters.h" |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 15 | #include "SkSize.h" |
| 16 | #include "SkStream.h" |
| 17 | #include "SkSwizzler.h" |
scroggo | 565901d | 2015-12-10 10:44:13 -0800 | [diff] [blame] | 18 | #include "SkTemplates.h" |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 19 | |
mtklein | 372d65c | 2016-01-27 13:01:41 -0800 | [diff] [blame^] | 20 | #if defined(__SSE2__) |
| 21 | #include "pngstruct.h" |
| 22 | |
| 23 | extern "C" void sk_png_init_filter_functions_sse2(png_structp png, unsigned int bpp) { |
| 24 | if (bpp == 3) { |
| 25 | png->read_filter[PNG_FILTER_VALUE_SUB -1] = sk_sub3_sse2; |
| 26 | png->read_filter[PNG_FILTER_VALUE_AVG -1] = sk_avg3_sse2; |
| 27 | png->read_filter[PNG_FILTER_VALUE_PAETH-1] = sk_paeth3_sse2; |
| 28 | } |
| 29 | if (bpp == 4) { |
| 30 | png->read_filter[PNG_FILTER_VALUE_SUB -1] = sk_sub4_sse2; |
| 31 | png->read_filter[PNG_FILTER_VALUE_AVG -1] = sk_avg4_sse2; |
| 32 | png->read_filter[PNG_FILTER_VALUE_PAETH-1] = sk_paeth4_sse2; |
| 33 | } |
| 34 | } |
| 35 | #endif |
| 36 | |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 37 | /////////////////////////////////////////////////////////////////////////////// |
| 38 | // Helper macros |
| 39 | /////////////////////////////////////////////////////////////////////////////// |
| 40 | |
| 41 | #ifndef png_jmpbuf |
| 42 | # define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf) |
| 43 | #endif |
| 44 | |
| 45 | /* These were dropped in libpng >= 1.4 */ |
| 46 | #ifndef png_infopp_NULL |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 47 | #define png_infopp_NULL nullptr |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 48 | #endif |
| 49 | |
| 50 | #ifndef png_bytepp_NULL |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 51 | #define png_bytepp_NULL nullptr |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 52 | #endif |
| 53 | |
| 54 | #ifndef int_p_NULL |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 55 | #define int_p_NULL nullptr |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 56 | #endif |
| 57 | |
| 58 | #ifndef png_flush_ptr_NULL |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 59 | #define png_flush_ptr_NULL nullptr |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 60 | #endif |
| 61 | |
| 62 | /////////////////////////////////////////////////////////////////////////////// |
| 63 | // Callback functions |
| 64 | /////////////////////////////////////////////////////////////////////////////// |
| 65 | |
| 66 | static void sk_error_fn(png_structp png_ptr, png_const_charp msg) { |
scroggo | 230d4ac | 2015-03-26 07:15:55 -0700 | [diff] [blame] | 67 | SkCodecPrintf("------ png error %s\n", msg); |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 68 | longjmp(png_jmpbuf(png_ptr), 1); |
| 69 | } |
| 70 | |
scroggo | 0eed6df | 2015-03-26 10:07:56 -0700 | [diff] [blame] | 71 | void sk_warning_fn(png_structp, png_const_charp msg) { |
| 72 | SkCodecPrintf("----- png warning %s\n", msg); |
| 73 | } |
| 74 | |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 75 | static void sk_read_fn(png_structp png_ptr, png_bytep data, |
| 76 | png_size_t length) { |
| 77 | SkStream* stream = static_cast<SkStream*>(png_get_io_ptr(png_ptr)); |
| 78 | const size_t bytes = stream->read(data, length); |
| 79 | if (bytes != length) { |
| 80 | // FIXME: We want to report the fact that the stream was truncated. |
| 81 | // One way to do that might be to pass a enum to longjmp so setjmp can |
| 82 | // specify the failure. |
| 83 | png_error(png_ptr, "Read Error!"); |
| 84 | } |
| 85 | } |
| 86 | |
scroggo | cf98fa9 | 2015-11-23 08:14:40 -0800 | [diff] [blame] | 87 | #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED |
| 88 | static int sk_read_user_chunk(png_structp png_ptr, png_unknown_chunkp chunk) { |
| 89 | SkPngChunkReader* chunkReader = (SkPngChunkReader*)png_get_user_chunk_ptr(png_ptr); |
| 90 | // readChunk() returning true means continue decoding |
| 91 | return chunkReader->readChunk((const char*)chunk->name, chunk->data, chunk->size) ? 1 : -1; |
| 92 | } |
| 93 | #endif |
| 94 | |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 95 | /////////////////////////////////////////////////////////////////////////////// |
| 96 | // Helpers |
| 97 | /////////////////////////////////////////////////////////////////////////////// |
| 98 | |
| 99 | class AutoCleanPng : public SkNoncopyable { |
| 100 | public: |
| 101 | AutoCleanPng(png_structp png_ptr) |
| 102 | : fPng_ptr(png_ptr) |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 103 | , fInfo_ptr(nullptr) {} |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 104 | |
| 105 | ~AutoCleanPng() { |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 106 | // fInfo_ptr will never be non-nullptr unless fPng_ptr is. |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 107 | if (fPng_ptr) { |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 108 | png_infopp info_pp = fInfo_ptr ? &fInfo_ptr : nullptr; |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 109 | png_destroy_read_struct(&fPng_ptr, info_pp, png_infopp_NULL); |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | void setInfoPtr(png_infop info_ptr) { |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 114 | SkASSERT(nullptr == fInfo_ptr); |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 115 | fInfo_ptr = info_ptr; |
| 116 | } |
| 117 | |
| 118 | void detach() { |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 119 | fPng_ptr = nullptr; |
| 120 | fInfo_ptr = nullptr; |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 121 | } |
| 122 | |
| 123 | private: |
| 124 | png_structp fPng_ptr; |
| 125 | png_infop fInfo_ptr; |
| 126 | }; |
| 127 | #define AutoCleanPng(...) SK_REQUIRE_LOCAL_VAR(AutoCleanPng) |
| 128 | |
emmaleer | 21cea72 | 2015-07-10 07:48:03 -0700 | [diff] [blame] | 129 | //checks if there is transparency info in the tRNS chunk |
| 130 | //image types which could have data in the tRNS chunk include: Index8, Gray8, RGB |
| 131 | static bool has_transparency_in_tRNS(png_structp png_ptr, |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 132 | png_infop info_ptr) { |
| 133 | if (!png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) { |
| 134 | return false; |
| 135 | } |
| 136 | |
| 137 | png_bytep trans; |
| 138 | int num_trans; |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 139 | png_get_tRNS(png_ptr, info_ptr, &trans, &num_trans, nullptr); |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 140 | return num_trans > 0; |
| 141 | } |
| 142 | |
| 143 | // Method for coverting to either an SkPMColor or a similarly packed |
| 144 | // unpremultiplied color. |
| 145 | typedef uint32_t (*PackColorProc)(U8CPU a, U8CPU r, U8CPU g, U8CPU b); |
| 146 | |
| 147 | // Note: SkColorTable claims to store SkPMColors, which is not necessarily |
| 148 | // the case here. |
scroggo | 9b2cdbf | 2015-07-10 12:07:02 -0700 | [diff] [blame] | 149 | bool SkPngCodec::decodePalette(bool premultiply, int* ctableCount) { |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 150 | int numPalette; |
| 151 | png_colorp palette; |
| 152 | png_bytep trans; |
| 153 | |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 154 | if (!png_get_PLTE(fPng_ptr, fInfo_ptr, &palette, &numPalette)) { |
| 155 | return false; |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 156 | } |
| 157 | |
msarett | 438b2ad | 2015-04-09 12:43:10 -0700 | [diff] [blame] | 158 | // Note: These are not necessarily SkPMColors |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 159 | SkPMColor colorStorage[256]; // worst-case storage |
| 160 | SkPMColor* colorPtr = colorStorage; |
| 161 | |
| 162 | int numTrans; |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 163 | if (png_get_valid(fPng_ptr, fInfo_ptr, PNG_INFO_tRNS)) { |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 164 | png_get_tRNS(fPng_ptr, fInfo_ptr, &trans, &numTrans, nullptr); |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 165 | } else { |
| 166 | numTrans = 0; |
| 167 | } |
| 168 | |
| 169 | // check for bad images that might make us crash |
| 170 | if (numTrans > numPalette) { |
| 171 | numTrans = numPalette; |
| 172 | } |
| 173 | |
| 174 | int index = 0; |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 175 | |
| 176 | // Choose which function to use to create the color table. If the final destination's |
| 177 | // colortype is unpremultiplied, the color table will store unpremultiplied colors. |
| 178 | PackColorProc proc; |
| 179 | if (premultiply) { |
| 180 | proc = &SkPreMultiplyARGB; |
| 181 | } else { |
| 182 | proc = &SkPackARGB32NoCheck; |
| 183 | } |
| 184 | for (; index < numTrans; index++) { |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 185 | *colorPtr++ = proc(*trans++, palette->red, palette->green, palette->blue); |
| 186 | palette++; |
| 187 | } |
| 188 | |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 189 | for (; index < numPalette; index++) { |
| 190 | *colorPtr++ = SkPackARGB32(0xFF, palette->red, palette->green, palette->blue); |
| 191 | palette++; |
| 192 | } |
| 193 | |
msarett | 438b2ad | 2015-04-09 12:43:10 -0700 | [diff] [blame] | 194 | /* BUGGY IMAGE WORKAROUND |
| 195 | Invalid images could contain pixel values that are greater than the number of palette |
| 196 | entries. Since we use pixel values as indices into the palette this could result in reading |
| 197 | beyond the end of the palette which could leak the contents of uninitialized memory. To |
| 198 | ensure this doesn't happen, we grow the colortable to the maximum size that can be |
| 199 | addressed by the bitdepth of the image and fill it with the last palette color or black if |
| 200 | the palette is empty (really broken image). |
| 201 | */ |
scroggo | 9b2cdbf | 2015-07-10 12:07:02 -0700 | [diff] [blame] | 202 | int colorCount = SkTMax(numPalette, 1 << SkTMin(fBitDepth, 8)); |
msarett | 438b2ad | 2015-04-09 12:43:10 -0700 | [diff] [blame] | 203 | SkPMColor lastColor = index > 0 ? colorPtr[-1] : SkPackARGB32(0xFF, 0, 0, 0); |
| 204 | for (; index < colorCount; index++) { |
| 205 | *colorPtr++ = lastColor; |
| 206 | } |
| 207 | |
| 208 | // Set the new color count |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 209 | if (ctableCount != nullptr) { |
msarett | 438b2ad | 2015-04-09 12:43:10 -0700 | [diff] [blame] | 210 | *ctableCount = colorCount; |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 211 | } |
| 212 | |
halcanary | 385fe4d | 2015-08-26 13:07:48 -0700 | [diff] [blame] | 213 | fColorTable.reset(new SkColorTable(colorStorage, colorCount)); |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 214 | return true; |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 215 | } |
| 216 | |
| 217 | /////////////////////////////////////////////////////////////////////////////// |
| 218 | // Creation |
| 219 | /////////////////////////////////////////////////////////////////////////////// |
| 220 | |
scroggo | db30be2 | 2015-12-08 18:54:13 -0800 | [diff] [blame] | 221 | bool SkPngCodec::IsPng(const char* buf, size_t bytesRead) { |
| 222 | return !png_sig_cmp((png_bytep) buf, (png_size_t)0, bytesRead); |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 223 | } |
| 224 | |
scroggo | cf98fa9 | 2015-11-23 08:14:40 -0800 | [diff] [blame] | 225 | // Reads the header and initializes the output fields, if not NULL. |
| 226 | // |
| 227 | // @param stream Input data. Will be read to get enough information to properly |
| 228 | // setup the codec. |
| 229 | // @param chunkReader SkPngChunkReader, for reading unknown chunks. May be NULL. |
| 230 | // If not NULL, png_ptr will hold an *unowned* pointer to it. The caller is |
| 231 | // expected to continue to own it for the lifetime of the png_ptr. |
| 232 | // @param png_ptrp Optional output variable. If non-NULL, will be set to a new |
| 233 | // png_structp on success. |
| 234 | // @param info_ptrp Optional output variable. If non-NULL, will be set to a new |
| 235 | // png_infop on success; |
| 236 | // @param imageInfo Optional output variable. If non-NULL, will be set to |
| 237 | // reflect the properties of the encoded image on success. |
| 238 | // @param bitDepthPtr Optional output variable. If non-NULL, will be set to the |
| 239 | // bit depth of the encoded image on success. |
| 240 | // @param numberPassesPtr Optional output variable. If non-NULL, will be set to |
| 241 | // the number_passes of the encoded image on success. |
| 242 | // @return true on success, in which case the caller is responsible for calling |
| 243 | // png_destroy_read_struct(png_ptrp, info_ptrp). |
| 244 | // If it returns false, the passed in fields (except stream) are unchanged. |
| 245 | static bool read_header(SkStream* stream, SkPngChunkReader* chunkReader, |
| 246 | png_structp* png_ptrp, png_infop* info_ptrp, |
| 247 | SkImageInfo* imageInfo, int* bitDepthPtr, int* numberPassesPtr) { |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 248 | // The image is known to be a PNG. Decode enough to know the SkImageInfo. |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 249 | png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, nullptr, |
scroggo | 0eed6df | 2015-03-26 10:07:56 -0700 | [diff] [blame] | 250 | sk_error_fn, sk_warning_fn); |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 251 | if (!png_ptr) { |
scroggo | 3eada2a | 2015-04-01 09:33:23 -0700 | [diff] [blame] | 252 | return false; |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 253 | } |
| 254 | |
| 255 | AutoCleanPng autoClean(png_ptr); |
| 256 | |
| 257 | png_infop info_ptr = png_create_info_struct(png_ptr); |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 258 | if (info_ptr == nullptr) { |
scroggo | 3eada2a | 2015-04-01 09:33:23 -0700 | [diff] [blame] | 259 | return false; |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 260 | } |
| 261 | |
| 262 | autoClean.setInfoPtr(info_ptr); |
| 263 | |
| 264 | // FIXME: Could we use the return value of setjmp to specify the type of |
| 265 | // error? |
| 266 | if (setjmp(png_jmpbuf(png_ptr))) { |
scroggo | 3eada2a | 2015-04-01 09:33:23 -0700 | [diff] [blame] | 267 | return false; |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 268 | } |
| 269 | |
| 270 | png_set_read_fn(png_ptr, static_cast<void*>(stream), sk_read_fn); |
| 271 | |
scroggo | cf98fa9 | 2015-11-23 08:14:40 -0800 | [diff] [blame] | 272 | #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED |
msarett | 133eaaa | 2016-01-07 11:03:25 -0800 | [diff] [blame] | 273 | // Hookup our chunkReader so we can see any user-chunks the caller may be interested in. |
| 274 | // This needs to be installed before we read the png header. Android may store ninepatch |
| 275 | // chunks in the header. |
scroggo | cf98fa9 | 2015-11-23 08:14:40 -0800 | [diff] [blame] | 276 | if (chunkReader) { |
| 277 | png_set_keep_unknown_chunks(png_ptr, PNG_HANDLE_CHUNK_ALWAYS, (png_byte*)"", 0); |
| 278 | png_set_read_user_chunk_fn(png_ptr, (png_voidp) chunkReader, sk_read_user_chunk); |
| 279 | } |
| 280 | #endif |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 281 | |
| 282 | // The call to png_read_info() gives us all of the information from the |
| 283 | // PNG file before the first IDAT (image data chunk). |
| 284 | png_read_info(png_ptr, info_ptr); |
| 285 | png_uint_32 origWidth, origHeight; |
| 286 | int bitDepth, colorType; |
| 287 | png_get_IHDR(png_ptr, info_ptr, &origWidth, &origHeight, &bitDepth, |
| 288 | &colorType, int_p_NULL, int_p_NULL, int_p_NULL); |
| 289 | |
scroggo | 6f29a3c | 2015-07-07 06:09:08 -0700 | [diff] [blame] | 290 | if (bitDepthPtr) { |
| 291 | *bitDepthPtr = bitDepth; |
| 292 | } |
| 293 | |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 294 | // sanity check for size |
| 295 | { |
| 296 | int64_t size = sk_64_mul(origWidth, origHeight); |
| 297 | // now check that if we are 4-bytes per pixel, we also don't overflow |
| 298 | if (size < 0 || size > (0x7FFFFFFF >> 2)) { |
scroggo | 3eada2a | 2015-04-01 09:33:23 -0700 | [diff] [blame] | 299 | return false; |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 300 | } |
| 301 | } |
| 302 | |
| 303 | // Tell libpng to strip 16 bit/color files down to 8 bits/color |
| 304 | if (bitDepth == 16) { |
| 305 | png_set_strip_16(png_ptr); |
| 306 | } |
| 307 | #ifdef PNG_READ_PACK_SUPPORTED |
| 308 | // Extract multiple pixels with bit depths of 1, 2, and 4 from a single |
| 309 | // byte into separate bytes (useful for paletted and grayscale images). |
| 310 | if (bitDepth < 8) { |
| 311 | png_set_packing(png_ptr); |
| 312 | } |
| 313 | #endif |
| 314 | // Expand grayscale images to the full 8 bits from 1, 2, or 4 bits/pixel. |
| 315 | if (colorType == PNG_COLOR_TYPE_GRAY && bitDepth < 8) { |
| 316 | png_set_expand_gray_1_2_4_to_8(png_ptr); |
| 317 | } |
| 318 | |
scroggo | 6f29a3c | 2015-07-07 06:09:08 -0700 | [diff] [blame] | 319 | // Now determine the default SkColorType and SkAlphaType and set required transforms |
msarett | f724b99 | 2015-10-15 06:41:06 -0700 | [diff] [blame] | 320 | SkColorType skColorType = kUnknown_SkColorType; |
| 321 | SkAlphaType skAlphaType = kUnknown_SkAlphaType; |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 322 | switch (colorType) { |
| 323 | case PNG_COLOR_TYPE_PALETTE: |
msarett | 438b2ad | 2015-04-09 12:43:10 -0700 | [diff] [blame] | 324 | skColorType = kIndex_8_SkColorType; |
emmaleer | 21cea72 | 2015-07-10 07:48:03 -0700 | [diff] [blame] | 325 | skAlphaType = has_transparency_in_tRNS(png_ptr, info_ptr) ? |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 326 | kUnpremul_SkAlphaType : kOpaque_SkAlphaType; |
| 327 | break; |
scroggo | 6f29a3c | 2015-07-07 06:09:08 -0700 | [diff] [blame] | 328 | case PNG_COLOR_TYPE_RGB: |
emmaleer | 21cea72 | 2015-07-10 07:48:03 -0700 | [diff] [blame] | 329 | if (has_transparency_in_tRNS(png_ptr, info_ptr)) { |
scroggo | 6f29a3c | 2015-07-07 06:09:08 -0700 | [diff] [blame] | 330 | //convert to RGBA with tranparency information in tRNS chunk if it exists |
| 331 | png_set_tRNS_to_alpha(png_ptr); |
jvanverth | 6c90e09 | 2015-07-02 10:35:25 -0700 | [diff] [blame] | 332 | skAlphaType = kUnpremul_SkAlphaType; |
| 333 | } else { |
| 334 | skAlphaType = kOpaque_SkAlphaType; |
| 335 | } |
| 336 | skColorType = kN32_SkColorType; |
| 337 | break; |
scroggo | 6f29a3c | 2015-07-07 06:09:08 -0700 | [diff] [blame] | 338 | case PNG_COLOR_TYPE_GRAY: |
emmaleer | 21cea72 | 2015-07-10 07:48:03 -0700 | [diff] [blame] | 339 | if (has_transparency_in_tRNS(png_ptr, info_ptr)) { |
scroggo | 6f29a3c | 2015-07-07 06:09:08 -0700 | [diff] [blame] | 340 | //FIXME: support gray with alpha as a color type |
| 341 | //convert to RGBA if there is transparentcy info in the tRNS chunk |
| 342 | png_set_tRNS_to_alpha(png_ptr); |
| 343 | png_set_gray_to_rgb(png_ptr); |
| 344 | skColorType = kN32_SkColorType; |
| 345 | skAlphaType = kUnpremul_SkAlphaType; |
| 346 | } else { |
| 347 | skColorType = kGray_8_SkColorType; |
| 348 | skAlphaType = kOpaque_SkAlphaType; |
| 349 | } |
| 350 | break; |
| 351 | case PNG_COLOR_TYPE_GRAY_ALPHA: |
mtklein | 372d65c | 2016-01-27 13:01:41 -0800 | [diff] [blame^] | 352 | //FIXME: support gray with alpha as a color type |
| 353 | //convert to RGBA |
jvanverth | 6c90e09 | 2015-07-02 10:35:25 -0700 | [diff] [blame] | 354 | png_set_gray_to_rgb(png_ptr); |
scroggo | 6f29a3c | 2015-07-07 06:09:08 -0700 | [diff] [blame] | 355 | skColorType = kN32_SkColorType; |
| 356 | skAlphaType = kUnpremul_SkAlphaType; |
| 357 | break; |
| 358 | case PNG_COLOR_TYPE_RGBA: |
| 359 | skColorType = kN32_SkColorType; |
| 360 | skAlphaType = kUnpremul_SkAlphaType; |
| 361 | break; |
| 362 | default: |
| 363 | //all the color types have been covered above |
| 364 | SkASSERT(false); |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 365 | } |
| 366 | |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 367 | int numberPasses = png_set_interlace_handling(png_ptr); |
| 368 | if (numberPassesPtr) { |
| 369 | *numberPassesPtr = numberPasses; |
| 370 | } |
| 371 | |
halcanary | 6950de6 | 2015-11-07 05:29:00 -0800 | [diff] [blame] | 372 | // FIXME: Also need to check for sRGB ( https://bug.skia.org/3471 ). |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 373 | |
scroggo | 3eada2a | 2015-04-01 09:33:23 -0700 | [diff] [blame] | 374 | if (imageInfo) { |
scroggo | 6f29a3c | 2015-07-07 06:09:08 -0700 | [diff] [blame] | 375 | *imageInfo = SkImageInfo::Make(origWidth, origHeight, skColorType, skAlphaType); |
scroggo | 3eada2a | 2015-04-01 09:33:23 -0700 | [diff] [blame] | 376 | } |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 377 | autoClean.detach(); |
scroggo | 3eada2a | 2015-04-01 09:33:23 -0700 | [diff] [blame] | 378 | if (png_ptrp) { |
| 379 | *png_ptrp = png_ptr; |
| 380 | } |
| 381 | if (info_ptrp) { |
| 382 | *info_ptrp = info_ptr; |
| 383 | } |
scroggo | 6f29a3c | 2015-07-07 06:09:08 -0700 | [diff] [blame] | 384 | |
scroggo | 3eada2a | 2015-04-01 09:33:23 -0700 | [diff] [blame] | 385 | return true; |
| 386 | } |
| 387 | |
scroggo | cf98fa9 | 2015-11-23 08:14:40 -0800 | [diff] [blame] | 388 | SkPngCodec::SkPngCodec(const SkImageInfo& info, SkStream* stream, SkPngChunkReader* chunkReader, |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 389 | png_structp png_ptr, png_infop info_ptr, int bitDepth, int numberPasses) |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 390 | : INHERITED(info, stream) |
scroggo | cf98fa9 | 2015-11-23 08:14:40 -0800 | [diff] [blame] | 391 | , fPngChunkReader(SkSafeRef(chunkReader)) |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 392 | , fPng_ptr(png_ptr) |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 393 | , fInfo_ptr(info_ptr) |
| 394 | , fSrcConfig(SkSwizzler::kUnknown) |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 395 | , fNumberPasses(numberPasses) |
scroggo | 6f29a3c | 2015-07-07 06:09:08 -0700 | [diff] [blame] | 396 | , fBitDepth(bitDepth) |
msarett | a4970dc | 2016-01-11 07:23:23 -0800 | [diff] [blame] | 397 | {} |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 398 | |
| 399 | SkPngCodec::~SkPngCodec() { |
scroggo | 3eada2a | 2015-04-01 09:33:23 -0700 | [diff] [blame] | 400 | this->destroyReadStruct(); |
| 401 | } |
| 402 | |
| 403 | void SkPngCodec::destroyReadStruct() { |
| 404 | if (fPng_ptr) { |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 405 | // We will never have a nullptr fInfo_ptr with a non-nullptr fPng_ptr |
scroggo | 3eada2a | 2015-04-01 09:33:23 -0700 | [diff] [blame] | 406 | SkASSERT(fInfo_ptr); |
| 407 | png_destroy_read_struct(&fPng_ptr, &fInfo_ptr, png_infopp_NULL); |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 408 | fPng_ptr = nullptr; |
| 409 | fInfo_ptr = nullptr; |
scroggo | 3eada2a | 2015-04-01 09:33:23 -0700 | [diff] [blame] | 410 | } |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 411 | } |
| 412 | |
| 413 | /////////////////////////////////////////////////////////////////////////////// |
| 414 | // Getting the pixels |
| 415 | /////////////////////////////////////////////////////////////////////////////// |
| 416 | |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 417 | SkCodec::Result SkPngCodec::initializeSwizzler(const SkImageInfo& requestedInfo, |
msarett | 438b2ad | 2015-04-09 12:43:10 -0700 | [diff] [blame] | 418 | const Options& options, |
msarett | 9e43cab | 2015-04-29 07:38:43 -0700 | [diff] [blame] | 419 | SkPMColor ctable[], |
msarett | 438b2ad | 2015-04-09 12:43:10 -0700 | [diff] [blame] | 420 | int* ctableCount) { |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 421 | // FIXME: Could we use the return value of setjmp to specify the type of |
| 422 | // error? |
| 423 | if (setjmp(png_jmpbuf(fPng_ptr))) { |
scroggo | 230d4ac | 2015-03-26 07:15:55 -0700 | [diff] [blame] | 424 | SkCodecPrintf("setjmp long jump!\n"); |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 425 | return kInvalidInput; |
| 426 | } |
mtklein | 372d65c | 2016-01-27 13:01:41 -0800 | [diff] [blame^] | 427 | png_read_update_info(fPng_ptr, fInfo_ptr); |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 428 | |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 429 | //srcColorType was determined in read_header() which determined png color type |
scroggo | 6f29a3c | 2015-07-07 06:09:08 -0700 | [diff] [blame] | 430 | const SkColorType srcColorType = this->getInfo().colorType(); |
| 431 | |
| 432 | switch (srcColorType) { |
| 433 | case kIndex_8_SkColorType: |
| 434 | //decode palette to Skia format |
| 435 | fSrcConfig = SkSwizzler::kIndex; |
scroggo | 9b2cdbf | 2015-07-10 12:07:02 -0700 | [diff] [blame] | 436 | if (!this->decodePalette(kPremul_SkAlphaType == requestedInfo.alphaType(), |
scroggo | 6f29a3c | 2015-07-07 06:09:08 -0700 | [diff] [blame] | 437 | ctableCount)) { |
| 438 | return kInvalidInput; |
| 439 | } |
| 440 | break; |
| 441 | case kGray_8_SkColorType: |
| 442 | fSrcConfig = SkSwizzler::kGray; |
mtklein | 372d65c | 2016-01-27 13:01:41 -0800 | [diff] [blame^] | 443 | break; |
scroggo | 6f29a3c | 2015-07-07 06:09:08 -0700 | [diff] [blame] | 444 | case kN32_SkColorType: |
| 445 | if (this->getInfo().alphaType() == kOpaque_SkAlphaType) { |
msarett | bda8609 | 2016-01-19 10:40:12 -0800 | [diff] [blame] | 446 | fSrcConfig = SkSwizzler::kRGB; |
scroggo | 6f29a3c | 2015-07-07 06:09:08 -0700 | [diff] [blame] | 447 | } else { |
| 448 | fSrcConfig = SkSwizzler::kRGBA; |
| 449 | } |
| 450 | break; |
| 451 | default: |
| 452 | //would have exited before now if the colorType was supported by png |
| 453 | SkASSERT(false); |
mtklein | 372d65c | 2016-01-27 13:01:41 -0800 | [diff] [blame^] | 454 | } |
msarett | 9e43cab | 2015-04-29 07:38:43 -0700 | [diff] [blame] | 455 | |
| 456 | // Copy the color table to the client if they request kIndex8 mode |
| 457 | copy_color_table(requestedInfo, fColorTable, ctable, ctableCount); |
| 458 | |
| 459 | // Create the swizzler. SkPngCodec retains ownership of the color table. |
msarett | 99f567e | 2015-08-05 12:58:26 -0700 | [diff] [blame] | 460 | const SkPMColor* colors = get_color_ptr(fColorTable.get()); |
msarett | fdb4757 | 2015-10-13 12:50:14 -0700 | [diff] [blame] | 461 | fSwizzler.reset(SkSwizzler::CreateSwizzler(fSrcConfig, colors, requestedInfo, options)); |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 462 | if (!fSwizzler) { |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 463 | // FIXME: CreateSwizzler could fail for another reason. |
| 464 | return kUnimplemented; |
| 465 | } |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 466 | return kSuccess; |
| 467 | } |
| 468 | |
scroggo | 6f29a3c | 2015-07-07 06:09:08 -0700 | [diff] [blame] | 469 | |
scroggo | b427db1 | 2015-08-12 07:24:13 -0700 | [diff] [blame] | 470 | bool SkPngCodec::onRewind() { |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 471 | // This sets fPng_ptr and fInfo_ptr to nullptr. If read_header |
scroggo | b427db1 | 2015-08-12 07:24:13 -0700 | [diff] [blame] | 472 | // succeeds, they will be repopulated, and if it fails, they will |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 473 | // remain nullptr. Any future accesses to fPng_ptr and fInfo_ptr will |
scroggo | b427db1 | 2015-08-12 07:24:13 -0700 | [diff] [blame] | 474 | // come through this function which will rewind and again attempt |
| 475 | // to reinitialize them. |
| 476 | this->destroyReadStruct(); |
| 477 | |
| 478 | png_structp png_ptr; |
| 479 | png_infop info_ptr; |
scroggo | cf98fa9 | 2015-11-23 08:14:40 -0800 | [diff] [blame] | 480 | if (!read_header(this->stream(), fPngChunkReader.get(), &png_ptr, &info_ptr, |
| 481 | nullptr, nullptr, nullptr)) { |
scroggo | b427db1 | 2015-08-12 07:24:13 -0700 | [diff] [blame] | 482 | return false; |
scroggo | 5842154 | 2015-04-01 11:25:20 -0700 | [diff] [blame] | 483 | } |
scroggo | b427db1 | 2015-08-12 07:24:13 -0700 | [diff] [blame] | 484 | |
| 485 | fPng_ptr = png_ptr; |
| 486 | fInfo_ptr = info_ptr; |
| 487 | return true; |
scroggo | 5842154 | 2015-04-01 11:25:20 -0700 | [diff] [blame] | 488 | } |
| 489 | |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 490 | SkCodec::Result SkPngCodec::onGetPixels(const SkImageInfo& requestedInfo, void* dst, |
msarett | 614aa07 | 2015-07-27 15:13:17 -0700 | [diff] [blame] | 491 | size_t dstRowBytes, const Options& options, |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 492 | SkPMColor ctable[], int* ctableCount, |
| 493 | int* rowsDecoded) { |
scroggo | 6f29a3c | 2015-07-07 06:09:08 -0700 | [diff] [blame] | 494 | if (!conversion_possible(requestedInfo, this->getInfo())) { |
| 495 | return kInvalidConversion; |
| 496 | } |
scroggo | b636b45 | 2015-07-22 07:16:20 -0700 | [diff] [blame] | 497 | if (options.fSubset) { |
| 498 | // Subsets are not supported. |
| 499 | return kUnimplemented; |
| 500 | } |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 501 | |
msarett | 9e43cab | 2015-04-29 07:38:43 -0700 | [diff] [blame] | 502 | // Note that ctable and ctableCount may be modified if there is a color table |
msarett | fdb4757 | 2015-10-13 12:50:14 -0700 | [diff] [blame] | 503 | const Result result = this->initializeSwizzler(requestedInfo, options, ctable, ctableCount); |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 504 | if (result != kSuccess) { |
| 505 | return result; |
| 506 | } |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 507 | // FIXME: Could we use the return value of setjmp to specify the type of |
| 508 | // error? |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 509 | int row = 0; |
| 510 | // This must be declared above the call to setjmp to avoid memory leaks on incomplete images. |
scroggo | 565901d | 2015-12-10 10:44:13 -0800 | [diff] [blame] | 511 | SkAutoTMalloc<uint8_t> storage; |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 512 | if (setjmp(png_jmpbuf(fPng_ptr))) { |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 513 | // Assume that any error that occurs while reading rows is caused by an incomplete input. |
| 514 | if (fNumberPasses > 1) { |
| 515 | // FIXME (msarett): Handle incomplete interlaced pngs. |
| 516 | return kInvalidInput; |
| 517 | } |
| 518 | // FIXME: We do a poor job on incomplete pngs compared to other decoders (ex: Chromium, |
| 519 | // Ubuntu Image Viewer). This is because we use the default buffer size in libpng (8192 |
| 520 | // bytes), and if we can't fill the buffer, we immediately fail. |
| 521 | // For example, if we try to read 8192 bytes, and the image (incorrectly) only contains |
| 522 | // half that, which may have been enough to contain a non-zero number of lines, we fail |
| 523 | // when we could have decoded a few more lines and then failed. |
| 524 | // The read function that we provide for libpng has no way of indicating that we have |
| 525 | // made a partial read. |
| 526 | // Making our buffer size smaller improves our incomplete decodes, but what impact does |
| 527 | // it have on regular decode performance? Should we investigate using a different API |
| 528 | // instead of png_read_row(s)? Chromium uses png_process_data. |
| 529 | *rowsDecoded = row; |
| 530 | return kIncompleteInput; |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 531 | } |
| 532 | |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 533 | // FIXME: We could split these out based on subclass. |
msarett | 614aa07 | 2015-07-27 15:13:17 -0700 | [diff] [blame] | 534 | void* dstRow = dst; |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 535 | if (fNumberPasses > 1) { |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 536 | const int width = requestedInfo.width(); |
| 537 | const int height = requestedInfo.height(); |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 538 | const int bpp = SkSwizzler::BytesPerPixel(fSrcConfig); |
msarett | 614aa07 | 2015-07-27 15:13:17 -0700 | [diff] [blame] | 539 | const size_t srcRowBytes = width * bpp; |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 540 | |
| 541 | storage.reset(width * height * bpp); |
scroggo | 565901d | 2015-12-10 10:44:13 -0800 | [diff] [blame] | 542 | uint8_t* const base = storage.get(); |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 543 | |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 544 | for (int i = 0; i < fNumberPasses; i++) { |
msarett | 614aa07 | 2015-07-27 15:13:17 -0700 | [diff] [blame] | 545 | uint8_t* srcRow = base; |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 546 | for (int y = 0; y < height; y++) { |
msarett | 614aa07 | 2015-07-27 15:13:17 -0700 | [diff] [blame] | 547 | uint8_t* bmRow = srcRow; |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 548 | png_read_rows(fPng_ptr, &bmRow, png_bytepp_NULL, 1); |
msarett | 614aa07 | 2015-07-27 15:13:17 -0700 | [diff] [blame] | 549 | srcRow += srcRowBytes; |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 550 | } |
| 551 | } |
| 552 | |
| 553 | // Now swizzle it. |
msarett | 614aa07 | 2015-07-27 15:13:17 -0700 | [diff] [blame] | 554 | uint8_t* srcRow = base; |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 555 | for (int y = 0; y < height; y++) { |
msarett | a4970dc | 2016-01-11 07:23:23 -0800 | [diff] [blame] | 556 | fSwizzler->swizzle(dstRow, srcRow); |
msarett | 614aa07 | 2015-07-27 15:13:17 -0700 | [diff] [blame] | 557 | dstRow = SkTAddOffset<void>(dstRow, dstRowBytes); |
| 558 | srcRow += srcRowBytes; |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 559 | } |
| 560 | } else { |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 561 | storage.reset(requestedInfo.width() * SkSwizzler::BytesPerPixel(fSrcConfig)); |
scroggo | 565901d | 2015-12-10 10:44:13 -0800 | [diff] [blame] | 562 | uint8_t* srcRow = storage.get(); |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 563 | for (; row < requestedInfo.height(); row++) { |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 564 | png_read_rows(fPng_ptr, &srcRow, png_bytepp_NULL, 1); |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 565 | // FIXME: Only call IsOpaque once, outside the loop. Same for onGetScanlines. |
msarett | a4970dc | 2016-01-11 07:23:23 -0800 | [diff] [blame] | 566 | fSwizzler->swizzle(dstRow, srcRow); |
msarett | 614aa07 | 2015-07-27 15:13:17 -0700 | [diff] [blame] | 567 | dstRow = SkTAddOffset<void>(dstRow, dstRowBytes); |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 568 | } |
| 569 | } |
| 570 | |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 571 | // FIXME: do we need substituteTranspColor? Note that we cannot do it for |
| 572 | // scanline decoding, but we could do it here. Alternatively, we could do |
| 573 | // it as we go, instead of in post-processing like SkPNGImageDecoder. |
scroggo | f24f224 | 2015-03-03 08:59:20 -0800 | [diff] [blame] | 574 | |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 575 | if (setjmp(png_jmpbuf(fPng_ptr))) { |
| 576 | // We've already read all the scanlines. This is a success. |
emmaleer | 973ae86 | 2015-07-20 13:38:44 -0700 | [diff] [blame] | 577 | return kSuccess; |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 578 | } |
emmaleer | 973ae86 | 2015-07-20 13:38:44 -0700 | [diff] [blame] | 579 | |
| 580 | // read rest of file, and get additional comment and time chunks in info_ptr |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 581 | png_read_end(fPng_ptr, fInfo_ptr); |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 582 | |
emmaleer | 973ae86 | 2015-07-20 13:38:44 -0700 | [diff] [blame] | 583 | return kSuccess; |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 584 | } |
| 585 | |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 586 | uint32_t SkPngCodec::onGetFillValue(SkColorType colorType, SkAlphaType alphaType) const { |
| 587 | const SkPMColor* colorPtr = get_color_ptr(fColorTable.get()); |
| 588 | if (colorPtr) { |
| 589 | return get_color_table_fill_value(colorType, colorPtr, 0); |
| 590 | } |
| 591 | return INHERITED::onGetFillValue(colorType, alphaType); |
| 592 | } |
| 593 | |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 594 | // Subclass of SkPngCodec which supports scanline decoding |
| 595 | class SkPngScanlineDecoder : public SkPngCodec { |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 596 | public: |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 597 | SkPngScanlineDecoder(const SkImageInfo& srcInfo, SkStream* stream, |
scroggo | cf98fa9 | 2015-11-23 08:14:40 -0800 | [diff] [blame] | 598 | SkPngChunkReader* chunkReader, png_structp png_ptr, png_infop info_ptr, int bitDepth) |
| 599 | : INHERITED(srcInfo, stream, chunkReader, png_ptr, info_ptr, bitDepth, 1) |
msarett | f724b99 | 2015-10-15 06:41:06 -0700 | [diff] [blame] | 600 | , fSrcRow(nullptr) |
scroggo | 1c005e4 | 2015-08-04 09:24:45 -0700 | [diff] [blame] | 601 | {} |
| 602 | |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 603 | Result onStartScanlineDecode(const SkImageInfo& dstInfo, const Options& options, |
| 604 | SkPMColor ctable[], int* ctableCount) override { |
scroggo | 1c005e4 | 2015-08-04 09:24:45 -0700 | [diff] [blame] | 605 | if (!conversion_possible(dstInfo, this->getInfo())) { |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 606 | return kInvalidConversion; |
scroggo | 1c005e4 | 2015-08-04 09:24:45 -0700 | [diff] [blame] | 607 | } |
| 608 | |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 609 | const Result result = this->initializeSwizzler(dstInfo, options, ctable, |
| 610 | ctableCount); |
| 611 | if (result != kSuccess) { |
scroggo | 1c005e4 | 2015-08-04 09:24:45 -0700 | [diff] [blame] | 612 | return result; |
| 613 | } |
| 614 | |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 615 | fStorage.reset(this->getInfo().width() * SkSwizzler::BytesPerPixel(this->srcConfig())); |
scroggo | 565901d | 2015-12-10 10:44:13 -0800 | [diff] [blame] | 616 | fSrcRow = fStorage.get(); |
scroggo | 1c005e4 | 2015-08-04 09:24:45 -0700 | [diff] [blame] | 617 | |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 618 | return kSuccess; |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 619 | } |
| 620 | |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 621 | int onGetScanlines(void* dst, int count, size_t rowBytes) override { |
| 622 | // Assume that an error in libpng indicates an incomplete input. |
| 623 | int row = 0; |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 624 | if (setjmp(png_jmpbuf(this->png_ptr()))) { |
scroggo | 230d4ac | 2015-03-26 07:15:55 -0700 | [diff] [blame] | 625 | SkCodecPrintf("setjmp long jump!\n"); |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 626 | return row; |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 627 | } |
| 628 | |
msarett | 614aa07 | 2015-07-27 15:13:17 -0700 | [diff] [blame] | 629 | void* dstRow = dst; |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 630 | for (; row < count; row++) { |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 631 | png_read_rows(this->png_ptr(), &fSrcRow, png_bytepp_NULL, 1); |
msarett | a4970dc | 2016-01-11 07:23:23 -0800 | [diff] [blame] | 632 | this->swizzler()->swizzle(dstRow, fSrcRow); |
msarett | 614aa07 | 2015-07-27 15:13:17 -0700 | [diff] [blame] | 633 | dstRow = SkTAddOffset<void>(dstRow, rowBytes); |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 634 | } |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 635 | |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 636 | return row; |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 637 | } |
| 638 | |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 639 | bool onSkipScanlines(int count) override { |
| 640 | // Assume that an error in libpng indicates an incomplete input. |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 641 | if (setjmp(png_jmpbuf(this->png_ptr()))) { |
scroggo | 230d4ac | 2015-03-26 07:15:55 -0700 | [diff] [blame] | 642 | SkCodecPrintf("setjmp long jump!\n"); |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 643 | return false; |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 644 | } |
mtklein | 372d65c | 2016-01-27 13:01:41 -0800 | [diff] [blame^] | 645 | //there is a potential tradeoff of memory vs speed created by putting this in a loop. |
| 646 | //calling png_read_rows in a loop is insignificantly slower than calling it once with count |
emmaleer | 7dc9190 | 2015-05-27 08:49:04 -0700 | [diff] [blame] | 647 | //as png_read_rows has it's own loop which calls png_read_row count times. |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 648 | for (int row = 0; row < count; row++) { |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 649 | png_read_rows(this->png_ptr(), &fSrcRow, png_bytepp_NULL, 1); |
emmaleer | 7dc9190 | 2015-05-27 08:49:04 -0700 | [diff] [blame] | 650 | } |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 651 | return true; |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 652 | } |
| 653 | |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 654 | private: |
scroggo | 565901d | 2015-12-10 10:44:13 -0800 | [diff] [blame] | 655 | SkAutoTMalloc<uint8_t> fStorage; |
scroggo | 9b2cdbf | 2015-07-10 12:07:02 -0700 | [diff] [blame] | 656 | uint8_t* fSrcRow; |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 657 | |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 658 | typedef SkPngCodec INHERITED; |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 659 | }; |
| 660 | |
emmaleer | 0a4c3cb | 2015-06-22 10:40:21 -0700 | [diff] [blame] | 661 | |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 662 | class SkPngInterlacedScanlineDecoder : public SkPngCodec { |
emmaleer | 0a4c3cb | 2015-06-22 10:40:21 -0700 | [diff] [blame] | 663 | public: |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 664 | SkPngInterlacedScanlineDecoder(const SkImageInfo& srcInfo, SkStream* stream, |
scroggo | cf98fa9 | 2015-11-23 08:14:40 -0800 | [diff] [blame] | 665 | SkPngChunkReader* chunkReader, png_structp png_ptr, png_infop info_ptr, |
| 666 | int bitDepth, int numberPasses) |
| 667 | : INHERITED(srcInfo, stream, chunkReader, png_ptr, info_ptr, bitDepth, numberPasses) |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 668 | , fHeight(-1) |
scroggo | 1c005e4 | 2015-08-04 09:24:45 -0700 | [diff] [blame] | 669 | , fCanSkipRewind(false) |
scroggo | 1c005e4 | 2015-08-04 09:24:45 -0700 | [diff] [blame] | 670 | { |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 671 | SkASSERT(numberPasses != 1); |
| 672 | } |
| 673 | |
| 674 | Result onStartScanlineDecode(const SkImageInfo& dstInfo, const Options& options, |
msarett | fdb4757 | 2015-10-13 12:50:14 -0700 | [diff] [blame] | 675 | SkPMColor ctable[], int* ctableCount) override { |
scroggo | 1c005e4 | 2015-08-04 09:24:45 -0700 | [diff] [blame] | 676 | if (!conversion_possible(dstInfo, this->getInfo())) { |
mtklein | 372d65c | 2016-01-27 13:01:41 -0800 | [diff] [blame^] | 677 | return kInvalidConversion; |
scroggo | 1c005e4 | 2015-08-04 09:24:45 -0700 | [diff] [blame] | 678 | } |
| 679 | |
msarett | fdb4757 | 2015-10-13 12:50:14 -0700 | [diff] [blame] | 680 | const Result result = this->initializeSwizzler(dstInfo, options, ctable, |
| 681 | ctableCount); |
| 682 | if (result != kSuccess) { |
scroggo | 1c005e4 | 2015-08-04 09:24:45 -0700 | [diff] [blame] | 683 | return result; |
| 684 | } |
| 685 | |
scroggo | 1c005e4 | 2015-08-04 09:24:45 -0700 | [diff] [blame] | 686 | fHeight = dstInfo.height(); |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 687 | // FIXME: This need not be called on a second call to onStartScanlineDecode. |
| 688 | fSrcRowBytes = this->getInfo().width() * SkSwizzler::BytesPerPixel(this->srcConfig()); |
scroggo | 1c005e4 | 2015-08-04 09:24:45 -0700 | [diff] [blame] | 689 | fGarbageRow.reset(fSrcRowBytes); |
| 690 | fGarbageRowPtr = static_cast<uint8_t*>(fGarbageRow.get()); |
| 691 | fCanSkipRewind = true; |
| 692 | |
| 693 | return SkCodec::kSuccess; |
| 694 | } |
| 695 | |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 696 | int onGetScanlines(void* dst, int count, size_t dstRowBytes) override { |
scroggo | 1c005e4 | 2015-08-04 09:24:45 -0700 | [diff] [blame] | 697 | // rewind stream if have previously called onGetScanlines, |
| 698 | // since we need entire progressive image to get scanlines |
| 699 | if (fCanSkipRewind) { |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 700 | // We already rewound in onStartScanlineDecode, so there is no reason to rewind. |
scroggo | 1c005e4 | 2015-08-04 09:24:45 -0700 | [diff] [blame] | 701 | // Next time onGetScanlines is called, we will need to rewind. |
| 702 | fCanSkipRewind = false; |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 703 | } else { |
| 704 | // rewindIfNeeded resets fCurrScanline, since it assumes that start |
| 705 | // needs to be called again before scanline decoding. PNG scanline |
| 706 | // decoding is the exception, since it needs to rewind between |
| 707 | // calls to getScanlines. Keep track of fCurrScanline, to undo the |
| 708 | // reset. |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 709 | const int currScanline = this->nextScanline(); |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 710 | // This method would never be called if currScanline is -1 |
| 711 | SkASSERT(currScanline != -1); |
| 712 | |
| 713 | if (!this->rewindIfNeeded()) { |
| 714 | return kCouldNotRewind; |
| 715 | } |
msarett | cb0d5c9 | 2015-12-03 12:23:43 -0800 | [diff] [blame] | 716 | this->updateCurrScanline(currScanline); |
scroggo | 1c005e4 | 2015-08-04 09:24:45 -0700 | [diff] [blame] | 717 | } |
| 718 | |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 719 | if (setjmp(png_jmpbuf(this->png_ptr()))) { |
emmaleer | 0a4c3cb | 2015-06-22 10:40:21 -0700 | [diff] [blame] | 720 | SkCodecPrintf("setjmp long jump!\n"); |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 721 | // FIXME (msarett): Returning 0 is pessimistic. If we can complete a single pass, |
| 722 | // we may be able to report that all of the memory has been initialized. Even if we |
| 723 | // fail on the first pass, we can still report than some scanlines are initialized. |
| 724 | return 0; |
emmaleer | 0a4c3cb | 2015-06-22 10:40:21 -0700 | [diff] [blame] | 725 | } |
scroggo | 565901d | 2015-12-10 10:44:13 -0800 | [diff] [blame] | 726 | SkAutoTMalloc<uint8_t> storage(count * fSrcRowBytes); |
| 727 | uint8_t* storagePtr = storage.get(); |
emmaleer | 0a4c3cb | 2015-06-22 10:40:21 -0700 | [diff] [blame] | 728 | uint8_t* srcRow; |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 729 | const int startRow = this->nextScanline(); |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 730 | for (int i = 0; i < this->numberPasses(); i++) { |
| 731 | // read rows we planned to skip into garbage row |
| 732 | for (int y = 0; y < startRow; y++){ |
| 733 | png_read_rows(this->png_ptr(), &fGarbageRowPtr, png_bytepp_NULL, 1); |
emmaleer | 0a4c3cb | 2015-06-22 10:40:21 -0700 | [diff] [blame] | 734 | } |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 735 | // read rows we care about into buffer |
emmaleer | 0a4c3cb | 2015-06-22 10:40:21 -0700 | [diff] [blame] | 736 | srcRow = storagePtr; |
| 737 | for (int y = 0; y < count; y++) { |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 738 | png_read_rows(this->png_ptr(), &srcRow, png_bytepp_NULL, 1); |
emmaleer | 0a4c3cb | 2015-06-22 10:40:21 -0700 | [diff] [blame] | 739 | srcRow += fSrcRowBytes; |
| 740 | } |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 741 | // read rows we don't want into garbage buffer |
| 742 | for (int y = 0; y < fHeight - startRow - count; y++) { |
| 743 | png_read_rows(this->png_ptr(), &fGarbageRowPtr, png_bytepp_NULL, 1); |
emmaleer | 0a4c3cb | 2015-06-22 10:40:21 -0700 | [diff] [blame] | 744 | } |
| 745 | } |
| 746 | //swizzle the rows we care about |
| 747 | srcRow = storagePtr; |
msarett | 614aa07 | 2015-07-27 15:13:17 -0700 | [diff] [blame] | 748 | void* dstRow = dst; |
emmaleer | 0a4c3cb | 2015-06-22 10:40:21 -0700 | [diff] [blame] | 749 | for (int y = 0; y < count; y++) { |
msarett | a4970dc | 2016-01-11 07:23:23 -0800 | [diff] [blame] | 750 | this->swizzler()->swizzle(dstRow, srcRow); |
msarett | 614aa07 | 2015-07-27 15:13:17 -0700 | [diff] [blame] | 751 | dstRow = SkTAddOffset<void>(dstRow, dstRowBytes); |
emmaleer | 0a4c3cb | 2015-06-22 10:40:21 -0700 | [diff] [blame] | 752 | srcRow += fSrcRowBytes; |
| 753 | } |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 754 | |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 755 | return count; |
emmaleer | 0a4c3cb | 2015-06-22 10:40:21 -0700 | [diff] [blame] | 756 | } |
| 757 | |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 758 | bool onSkipScanlines(int count) override { |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 759 | // The non-virtual version will update fCurrScanline. |
msarett | e6dd004 | 2015-10-09 11:07:34 -0700 | [diff] [blame] | 760 | return true; |
emmaleer | 0a4c3cb | 2015-06-22 10:40:21 -0700 | [diff] [blame] | 761 | } |
| 762 | |
msarett | 5406d6f | 2015-08-31 06:55:13 -0700 | [diff] [blame] | 763 | SkScanlineOrder onGetScanlineOrder() const override { |
| 764 | return kNone_SkScanlineOrder; |
emmaleer | 8f4ba76 | 2015-08-14 07:44:46 -0700 | [diff] [blame] | 765 | } |
| 766 | |
emmaleer | 0a4c3cb | 2015-06-22 10:40:21 -0700 | [diff] [blame] | 767 | private: |
scroggo | 9b2cdbf | 2015-07-10 12:07:02 -0700 | [diff] [blame] | 768 | int fHeight; |
| 769 | size_t fSrcRowBytes; |
| 770 | SkAutoMalloc fGarbageRow; |
| 771 | uint8_t* fGarbageRowPtr; |
scroggo | 1c005e4 | 2015-08-04 09:24:45 -0700 | [diff] [blame] | 772 | // FIXME: This imitates behavior in SkCodec::rewindIfNeeded. That function |
| 773 | // is called whenever some action is taken that reads the stream and |
| 774 | // therefore the next call will require a rewind. So it modifies a boolean |
| 775 | // to note that the *next* time it is called a rewind is needed. |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 776 | // SkPngInterlacedScanlineDecoder has an extra wrinkle - calling |
| 777 | // onStartScanlineDecode followed by onGetScanlines does *not* require a |
| 778 | // rewind. Since rewindIfNeeded does not have this flexibility, we need to |
| 779 | // add another layer. |
scroggo | 1c005e4 | 2015-08-04 09:24:45 -0700 | [diff] [blame] | 780 | bool fCanSkipRewind; |
emmaleer | 0a4c3cb | 2015-06-22 10:40:21 -0700 | [diff] [blame] | 781 | |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 782 | typedef SkPngCodec INHERITED; |
emmaleer | 0a4c3cb | 2015-06-22 10:40:21 -0700 | [diff] [blame] | 783 | }; |
| 784 | |
scroggo | cf98fa9 | 2015-11-23 08:14:40 -0800 | [diff] [blame] | 785 | SkCodec* SkPngCodec::NewFromStream(SkStream* stream, SkPngChunkReader* chunkReader) { |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 786 | SkAutoTDelete<SkStream> streamDeleter(stream); |
| 787 | png_structp png_ptr; |
| 788 | png_infop info_ptr; |
| 789 | SkImageInfo imageInfo; |
| 790 | int bitDepth; |
| 791 | int numberPasses; |
| 792 | |
scroggo | cf98fa9 | 2015-11-23 08:14:40 -0800 | [diff] [blame] | 793 | if (!read_header(stream, chunkReader, &png_ptr, &info_ptr, &imageInfo, &bitDepth, |
| 794 | &numberPasses)) { |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 795 | return nullptr; |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 796 | } |
| 797 | |
scroggo | 46c5747 | 2015-09-30 08:57:13 -0700 | [diff] [blame] | 798 | if (1 == numberPasses) { |
scroggo | cf98fa9 | 2015-11-23 08:14:40 -0800 | [diff] [blame] | 799 | return new SkPngScanlineDecoder(imageInfo, streamDeleter.detach(), chunkReader, |
| 800 | png_ptr, info_ptr, bitDepth); |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 801 | } |
| 802 | |
scroggo | cf98fa9 | 2015-11-23 08:14:40 -0800 | [diff] [blame] | 803 | return new SkPngInterlacedScanlineDecoder(imageInfo, streamDeleter.detach(), chunkReader, |
| 804 | png_ptr, info_ptr, bitDepth, numberPasses); |
scroggo | 0524590 | 2015-03-25 11:11:52 -0700 | [diff] [blame] | 805 | } |