epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2006 The Android Open Source Project |
| 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 | |
Hal Canary | db68301 | 2016-11-23 08:55:18 -0700 | [diff] [blame] | 8 | #include "SkImageEncoderPriv.h" |
Hal Canary | 1fcc404 | 2016-11-30 17:07:59 -0500 | [diff] [blame] | 9 | |
| 10 | #ifdef SK_HAS_PNG_LIBRARY |
| 11 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 12 | #include "SkColor.h" |
| 13 | #include "SkColorPriv.h" |
| 14 | #include "SkDither.h" |
| 15 | #include "SkMath.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 16 | #include "SkStream.h" |
| 17 | #include "SkTemplates.h" |
Hal Canary | 1fcc404 | 2016-11-30 17:07:59 -0500 | [diff] [blame] | 18 | #include "SkUnPreMultiply.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 19 | #include "SkUtils.h" |
epoger@google.com | 4ce738b | 2012-11-16 18:44:18 +0000 | [diff] [blame] | 20 | #include "transform_scanline.h" |
djsollen | b2a6fe7 | 2015-04-03 12:35:27 -0700 | [diff] [blame] | 21 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 22 | #include "png.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 23 | |
halcanary | 4e44efe | 2016-08-04 10:47:16 -0700 | [diff] [blame] | 24 | // Suppress most PNG warnings when calling image decode functions. |
Matt Sarett | 32bf449 | 2017-01-02 09:56:02 -0500 | [diff] [blame] | 25 | static const bool c_suppressPNGImageDecoderWarnings = true; |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 26 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 27 | static void sk_error_fn(png_structp png_ptr, png_const_charp msg) { |
scroggo | 04a0d3f | 2015-12-10 08:54:36 -0800 | [diff] [blame] | 28 | if (!c_suppressPNGImageDecoderWarnings) { |
| 29 | SkDEBUGF(("------ png error %s\n", msg)); |
| 30 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 31 | longjmp(png_jmpbuf(png_ptr), 1); |
| 32 | } |
| 33 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 34 | static void sk_write_fn(png_structp png_ptr, png_bytep data, png_size_t len) { |
commit-bot@chromium.org | c1c5695 | 2013-05-02 13:41:34 +0000 | [diff] [blame] | 35 | SkWStream* sk_stream = (SkWStream*)png_get_io_ptr(png_ptr); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 36 | if (!sk_stream->write(data, len)) { |
| 37 | png_error(png_ptr, "sk_write_fn Error!"); |
| 38 | } |
| 39 | } |
| 40 | |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 41 | static transform_scanline_proc choose_proc(const SkImageInfo& info) { |
| 42 | const bool isGammaEncoded = info.gammaCloseToSRGB(); |
| 43 | switch (info.colorType()) { |
| 44 | case kRGBA_8888_SkColorType: |
| 45 | switch (info.alphaType()) { |
| 46 | case kOpaque_SkAlphaType: |
| 47 | return transform_scanline_RGBX; |
| 48 | case kUnpremul_SkAlphaType: |
| 49 | return transform_scanline_memcpy; |
| 50 | case kPremul_SkAlphaType: |
| 51 | return isGammaEncoded ? transform_scanline_srgbA : |
| 52 | transform_scanline_rgbA; |
| 53 | default: |
| 54 | SkASSERT(false); |
| 55 | return nullptr; |
| 56 | } |
| 57 | case kBGRA_8888_SkColorType: |
| 58 | switch (info.alphaType()) { |
| 59 | case kOpaque_SkAlphaType: |
| 60 | return transform_scanline_BGRX; |
| 61 | case kUnpremul_SkAlphaType: |
| 62 | return transform_scanline_BGRA; |
| 63 | case kPremul_SkAlphaType: |
| 64 | return isGammaEncoded ? transform_scanline_sbgrA : |
| 65 | transform_scanline_bgrA; |
| 66 | default: |
| 67 | SkASSERT(false); |
| 68 | return nullptr; |
| 69 | } |
| 70 | case kRGB_565_SkColorType: |
| 71 | return transform_scanline_565; |
| 72 | case kARGB_4444_SkColorType: |
| 73 | switch (info.alphaType()) { |
| 74 | case kOpaque_SkAlphaType: |
| 75 | return transform_scanline_444; |
| 76 | case kPremul_SkAlphaType: |
| 77 | // 4444 is assumed to be legacy premul. |
| 78 | return transform_scanline_4444; |
| 79 | default: |
| 80 | SkASSERT(false); |
| 81 | return nullptr; |
| 82 | } |
| 83 | case kIndex_8_SkColorType: |
| 84 | case kGray_8_SkColorType: |
| 85 | return transform_scanline_memcpy; |
Matt Sarett | 1da27ef | 2017-01-19 17:14:07 -0500 | [diff] [blame^] | 86 | case kRGBA_F16_SkColorType: |
| 87 | switch (info.alphaType()) { |
| 88 | case kOpaque_SkAlphaType: |
| 89 | case kUnpremul_SkAlphaType: |
| 90 | return transform_scanline_F16; |
| 91 | case kPremul_SkAlphaType: |
| 92 | return transform_scanline_F16_premul; |
| 93 | default: |
| 94 | SkASSERT(false); |
| 95 | return nullptr; |
| 96 | } |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 97 | default: |
| 98 | SkASSERT(false); |
| 99 | return nullptr; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 100 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 101 | } |
| 102 | |
msarett | fed0334 | 2016-09-13 07:08:15 -0700 | [diff] [blame] | 103 | /* Pack palette[] with the corresponding colors, and if the image has alpha, also |
| 104 | pack trans[] and return the number of alphas[] entries written. If the image is |
| 105 | opaque, the return value will always be 0. |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 106 | */ |
msarett | fed0334 | 2016-09-13 07:08:15 -0700 | [diff] [blame] | 107 | static inline int pack_palette(SkColorTable* ctable, png_color* SK_RESTRICT palette, |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 108 | png_byte* SK_RESTRICT alphas, const SkImageInfo& info) { |
| 109 | const SkPMColor* colors = ctable->readColors(); |
msarett | fed0334 | 2016-09-13 07:08:15 -0700 | [diff] [blame] | 110 | const int count = ctable->count(); |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 111 | SkPMColor storage[256]; |
| 112 | if (kPremul_SkAlphaType == info.alphaType()) { |
| 113 | // Unpremultiply the colors. |
| 114 | const SkImageInfo rgbaInfo = info.makeColorType(kRGBA_8888_SkColorType); |
| 115 | transform_scanline_proc proc = choose_proc(rgbaInfo); |
| 116 | proc((char*) storage, (const char*) colors, ctable->count(), 4); |
| 117 | colors = storage; |
| 118 | } |
rmistry@google.com | d6176b0 | 2012-08-23 18:14:13 +0000 | [diff] [blame] | 119 | |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 120 | int numWithAlpha = 0; |
| 121 | if (kOpaque_SkAlphaType != info.alphaType()) { |
msarett | fed0334 | 2016-09-13 07:08:15 -0700 | [diff] [blame] | 122 | // PNG requires that all non-opaque colors come first in the palette. Write these first. |
| 123 | for (int i = 0; i < count; i++) { |
| 124 | uint8_t alpha = SkGetPackedA32(colors[i]); |
| 125 | if (0xFF != alpha) { |
| 126 | alphas[numWithAlpha] = alpha; |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 127 | palette[numWithAlpha].red = SkGetPackedR32(colors[i]); |
| 128 | palette[numWithAlpha].green = SkGetPackedG32(colors[i]); |
| 129 | palette[numWithAlpha].blue = SkGetPackedB32(colors[i]); |
msarett | fed0334 | 2016-09-13 07:08:15 -0700 | [diff] [blame] | 130 | numWithAlpha++; |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 131 | } |
rmistry@google.com | d6176b0 | 2012-08-23 18:14:13 +0000 | [diff] [blame] | 132 | } |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 133 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 134 | } |
rmistry@google.com | d6176b0 | 2012-08-23 18:14:13 +0000 | [diff] [blame] | 135 | |
msarett | fed0334 | 2016-09-13 07:08:15 -0700 | [diff] [blame] | 136 | if (0 == numWithAlpha) { |
| 137 | // All of the entries are opaque. |
| 138 | for (int i = 0; i < count; i++) { |
| 139 | SkPMColor c = *colors++; |
| 140 | palette[i].red = SkGetPackedR32(c); |
| 141 | palette[i].green = SkGetPackedG32(c); |
| 142 | palette[i].blue = SkGetPackedB32(c); |
| 143 | } |
| 144 | } else { |
| 145 | // We have already written the non-opaque colors. Now just write the opaque colors. |
| 146 | int currIndex = numWithAlpha; |
| 147 | int i = 0; |
| 148 | while (currIndex != count) { |
| 149 | uint8_t alpha = SkGetPackedA32(colors[i]); |
| 150 | if (0xFF == alpha) { |
| 151 | palette[currIndex].red = SkGetPackedR32(colors[i]); |
| 152 | palette[currIndex].green = SkGetPackedG32(colors[i]); |
| 153 | palette[currIndex].blue = SkGetPackedB32(colors[i]); |
| 154 | currIndex++; |
| 155 | } |
| 156 | |
| 157 | i++; |
| 158 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 159 | } |
msarett | fed0334 | 2016-09-13 07:08:15 -0700 | [diff] [blame] | 160 | |
| 161 | return numWithAlpha; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 162 | } |
| 163 | |
Hal Canary | 1fcc404 | 2016-11-30 17:07:59 -0500 | [diff] [blame] | 164 | static bool do_encode(SkWStream*, const SkPixmap&, int, int, png_color_8&); |
commit-bot@chromium.org | a936e37 | 2013-03-14 14:42:18 +0000 | [diff] [blame] | 165 | |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 166 | bool SkEncodeImageAsPNG(SkWStream* stream, const SkPixmap& src, const SkEncodeOptions& opts) { |
| 167 | SkASSERT(!src.colorSpace() || src.colorSpace()->gammaCloseToSRGB() || |
| 168 | src.colorSpace()->gammaIsLinear()); |
| 169 | |
| 170 | SkPixmap pixmap = src; |
| 171 | if (SkEncodeOptions::PremulBehavior::kLegacy == opts.fPremulBehavior) { |
| 172 | pixmap.setColorSpace(nullptr); |
| 173 | } else { |
| 174 | if (!pixmap.colorSpace()) { |
| 175 | return false; |
| 176 | } |
| 177 | } |
| 178 | |
Hal Canary | 1fcc404 | 2016-11-30 17:07:59 -0500 | [diff] [blame] | 179 | if (!pixmap.addr() || pixmap.info().isEmpty()) { |
| 180 | return false; |
| 181 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 182 | |
Matt Sarett | 1da27ef | 2017-01-19 17:14:07 -0500 | [diff] [blame^] | 183 | const SkColorType colorType = pixmap.colorType(); |
Hal Canary | 1fcc404 | 2016-11-30 17:07:59 -0500 | [diff] [blame] | 184 | const SkAlphaType alphaType = pixmap.alphaType(); |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 185 | switch (alphaType) { |
| 186 | case kUnpremul_SkAlphaType: |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 187 | if (kARGB_4444_SkColorType == colorType) { |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 188 | return false; |
| 189 | } |
| 190 | |
| 191 | break; |
| 192 | case kOpaque_SkAlphaType: |
| 193 | case kPremul_SkAlphaType: |
| 194 | break; |
| 195 | default: |
| 196 | return false; |
| 197 | } |
| 198 | |
| 199 | const bool isOpaque = (kOpaque_SkAlphaType == alphaType); |
Matt Sarett | 1da27ef | 2017-01-19 17:14:07 -0500 | [diff] [blame^] | 200 | int bitDepth = 8; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 201 | png_color_8 sig_bit; |
msarett | 9b09cd8 | 2016-08-29 14:47:49 -0700 | [diff] [blame] | 202 | sk_bzero(&sig_bit, sizeof(png_color_8)); |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 203 | int pngColorType; |
| 204 | switch (colorType) { |
Matt Sarett | 1da27ef | 2017-01-19 17:14:07 -0500 | [diff] [blame^] | 205 | case kRGBA_F16_SkColorType: |
| 206 | if (!pixmap.colorSpace() || !pixmap.colorSpace()->gammaIsLinear()) { |
| 207 | return false; |
| 208 | } |
| 209 | |
| 210 | sig_bit.red = 16; |
| 211 | sig_bit.green = 16; |
| 212 | sig_bit.blue = 16; |
| 213 | sig_bit.alpha = 16; |
| 214 | bitDepth = 16; |
| 215 | pngColorType = isOpaque ? PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_RGB_ALPHA; |
| 216 | break; |
reed | 0689d7b | 2014-06-14 05:30:20 -0700 | [diff] [blame] | 217 | case kIndex_8_SkColorType: |
msarett | 9b09cd8 | 2016-08-29 14:47:49 -0700 | [diff] [blame] | 218 | sig_bit.red = 8; |
| 219 | sig_bit.green = 8; |
| 220 | sig_bit.blue = 8; |
| 221 | sig_bit.alpha = 8; |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 222 | pngColorType = PNG_COLOR_TYPE_PALETTE; |
msarett | 9b09cd8 | 2016-08-29 14:47:49 -0700 | [diff] [blame] | 223 | break; |
| 224 | case kGray_8_SkColorType: |
| 225 | sig_bit.gray = 8; |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 226 | pngColorType = PNG_COLOR_TYPE_GRAY; |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 227 | SkASSERT(isOpaque); |
msarett | 9b09cd8 | 2016-08-29 14:47:49 -0700 | [diff] [blame] | 228 | break; |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 229 | case kRGBA_8888_SkColorType: |
| 230 | case kBGRA_8888_SkColorType: |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 231 | sig_bit.red = 8; |
| 232 | sig_bit.green = 8; |
| 233 | sig_bit.blue = 8; |
| 234 | sig_bit.alpha = 8; |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 235 | pngColorType = isOpaque ? PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_RGB_ALPHA; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 236 | break; |
reed | 0689d7b | 2014-06-14 05:30:20 -0700 | [diff] [blame] | 237 | case kARGB_4444_SkColorType: |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 238 | sig_bit.red = 4; |
| 239 | sig_bit.green = 4; |
| 240 | sig_bit.blue = 4; |
| 241 | sig_bit.alpha = 4; |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 242 | pngColorType = isOpaque ? PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_RGB_ALPHA; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 243 | break; |
reed | 0689d7b | 2014-06-14 05:30:20 -0700 | [diff] [blame] | 244 | case kRGB_565_SkColorType: |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 245 | sig_bit.red = 5; |
| 246 | sig_bit.green = 6; |
| 247 | sig_bit.blue = 5; |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 248 | pngColorType = PNG_COLOR_TYPE_RGB; |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 249 | SkASSERT(isOpaque); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 250 | break; |
| 251 | default: |
| 252 | return false; |
| 253 | } |
Matt Sarett | 1da27ef | 2017-01-19 17:14:07 -0500 | [diff] [blame^] | 254 | |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 255 | if (kIndex_8_SkColorType == colorType) { |
Hal Canary | 1fcc404 | 2016-11-30 17:07:59 -0500 | [diff] [blame] | 256 | SkColorTable* ctable = pixmap.ctable(); |
| 257 | if (!ctable || ctable->count() == 0) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 258 | return false; |
| 259 | } |
Matt Sarett | 32bf449 | 2017-01-02 09:56:02 -0500 | [diff] [blame] | 260 | |
| 261 | // Currently, we always use 8-bit indices for paletted pngs. |
| 262 | // When ctable->count() <= 16, we could potentially use 1, 2, |
| 263 | // or 4 bit indices. |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 264 | } |
Matt Sarett | 1da27ef | 2017-01-19 17:14:07 -0500 | [diff] [blame^] | 265 | |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 266 | return do_encode(stream, pixmap, pngColorType, bitDepth, sig_bit); |
tomhudson@google.com | 5c210c7 | 2011-07-28 21:06:40 +0000 | [diff] [blame] | 267 | } |
| 268 | |
Matt Sarett | 1da27ef | 2017-01-19 17:14:07 -0500 | [diff] [blame^] | 269 | static int num_components(int pngColorType) { |
| 270 | switch (pngColorType) { |
| 271 | case PNG_COLOR_TYPE_PALETTE: |
| 272 | case PNG_COLOR_TYPE_GRAY: |
| 273 | return 1; |
| 274 | case PNG_COLOR_TYPE_RGB: |
| 275 | return 3; |
| 276 | case PNG_COLOR_TYPE_RGBA: |
| 277 | return 4; |
| 278 | default: |
| 279 | SkASSERT(false); |
| 280 | return 0; |
| 281 | } |
| 282 | } |
| 283 | |
Hal Canary | 1fcc404 | 2016-11-30 17:07:59 -0500 | [diff] [blame] | 284 | static bool do_encode(SkWStream* stream, const SkPixmap& pixmap, |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 285 | int pngColorType, int bitDepth, png_color_8& sig_bit) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 286 | png_structp png_ptr; |
| 287 | png_infop info_ptr; |
| 288 | |
Hal Canary | 1fcc404 | 2016-11-30 17:07:59 -0500 | [diff] [blame] | 289 | png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, nullptr, sk_error_fn, nullptr); |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 290 | if (nullptr == png_ptr) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 291 | return false; |
| 292 | } |
| 293 | |
| 294 | info_ptr = png_create_info_struct(png_ptr); |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 295 | if (nullptr == info_ptr) { |
Matt Sarett | 32bf449 | 2017-01-02 09:56:02 -0500 | [diff] [blame] | 296 | png_destroy_write_struct(&png_ptr, nullptr); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 297 | return false; |
| 298 | } |
| 299 | |
| 300 | /* Set error handling. REQUIRED if you aren't supplying your own |
| 301 | * error handling functions in the png_create_write_struct() call. |
| 302 | */ |
| 303 | if (setjmp(png_jmpbuf(png_ptr))) { |
| 304 | png_destroy_write_struct(&png_ptr, &info_ptr); |
| 305 | return false; |
| 306 | } |
| 307 | |
Matt Sarett | 32bf449 | 2017-01-02 09:56:02 -0500 | [diff] [blame] | 308 | png_set_write_fn(png_ptr, (void*)stream, sk_write_fn, nullptr); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 309 | |
| 310 | /* Set the image information here. Width and height are up to 2^31, |
| 311 | * bit_depth is one of 1, 2, 4, 8, or 16, but valid values also depend on |
| 312 | * the color_type selected. color_type is one of PNG_COLOR_TYPE_GRAY, |
| 313 | * PNG_COLOR_TYPE_GRAY_ALPHA, PNG_COLOR_TYPE_PALETTE, PNG_COLOR_TYPE_RGB, |
| 314 | * or PNG_COLOR_TYPE_RGB_ALPHA. interlace is either PNG_INTERLACE_NONE or |
| 315 | * PNG_INTERLACE_ADAM7, and the compression_type and filter_type MUST |
| 316 | * currently be PNG_COMPRESSION_TYPE_BASE and PNG_FILTER_TYPE_BASE. REQUIRED |
| 317 | */ |
| 318 | |
Hal Canary | 1fcc404 | 2016-11-30 17:07:59 -0500 | [diff] [blame] | 319 | png_set_IHDR(png_ptr, info_ptr, pixmap.width(), pixmap.height(), |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 320 | bitDepth, pngColorType, |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 321 | PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, |
| 322 | PNG_FILTER_TYPE_BASE); |
| 323 | |
reed@android.com | 6189877 | 2009-07-07 19:38:01 +0000 | [diff] [blame] | 324 | // set our colortable/trans arrays if needed |
| 325 | png_color paletteColors[256]; |
| 326 | png_byte trans[256]; |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 327 | if (kIndex_8_SkColorType == pixmap.colorType()) { |
Hal Canary | 1fcc404 | 2016-11-30 17:07:59 -0500 | [diff] [blame] | 328 | SkColorTable* colorTable = pixmap.ctable(); |
msarett | fed0334 | 2016-09-13 07:08:15 -0700 | [diff] [blame] | 329 | SkASSERT(colorTable); |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 330 | int numTrans = pack_palette(colorTable, paletteColors, trans, pixmap.info()); |
msarett | f17b71f | 2016-09-12 14:30:03 -0700 | [diff] [blame] | 331 | png_set_PLTE(png_ptr, info_ptr, paletteColors, colorTable->count()); |
reed@android.com | 6189877 | 2009-07-07 19:38:01 +0000 | [diff] [blame] | 332 | if (numTrans > 0) { |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 333 | png_set_tRNS(png_ptr, info_ptr, trans, numTrans, nullptr); |
reed@android.com | 6189877 | 2009-07-07 19:38:01 +0000 | [diff] [blame] | 334 | } |
| 335 | } |
msarett | 9b09cd8 | 2016-08-29 14:47:49 -0700 | [diff] [blame] | 336 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 337 | png_set_sBIT(png_ptr, info_ptr, &sig_bit); |
| 338 | png_write_info(png_ptr, info_ptr); |
Matt Sarett | 1da27ef | 2017-01-19 17:14:07 -0500 | [diff] [blame^] | 339 | int pngBytesPerPixel = num_components(pngColorType) * (bitDepth / 8); |
| 340 | if (kRGBA_F16_SkColorType == pixmap.colorType() && kOpaque_SkAlphaType == pixmap.alphaType()) { |
| 341 | // For kOpaque, kRGBA_F16, we will keep the row as RGBA and tell libpng |
| 342 | // to skip the alpha channel. |
| 343 | png_set_filler(png_ptr, 0, PNG_FILLER_AFTER); |
| 344 | pngBytesPerPixel = 8; |
| 345 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 346 | |
Matt Sarett | 1da27ef | 2017-01-19 17:14:07 -0500 | [diff] [blame^] | 347 | SkAutoSTMalloc<1024, char> rowStorage(pixmap.width() * pngBytesPerPixel); |
scroggo | 565901d | 2015-12-10 10:44:13 -0800 | [diff] [blame] | 348 | char* storage = rowStorage.get(); |
Matt Sarett | 1da27ef | 2017-01-19 17:14:07 -0500 | [diff] [blame^] | 349 | const char* srcImage = (const char*)pixmap.addr(); |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 350 | transform_scanline_proc proc = choose_proc(pixmap.info()); |
Hal Canary | 1fcc404 | 2016-11-30 17:07:59 -0500 | [diff] [blame] | 351 | for (int y = 0; y < pixmap.height(); y++) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 352 | png_bytep row_ptr = (png_bytep)storage; |
Matt Sarett | 84014f0 | 2017-01-10 11:28:54 -0500 | [diff] [blame] | 353 | proc(storage, srcImage, pixmap.width(), SkColorTypeBytesPerPixel(pixmap.colorType())); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 354 | png_write_rows(png_ptr, &row_ptr, 1); |
Hal Canary | 1fcc404 | 2016-11-30 17:07:59 -0500 | [diff] [blame] | 355 | srcImage += pixmap.rowBytes(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 356 | } |
| 357 | |
| 358 | png_write_end(png_ptr, info_ptr); |
| 359 | |
| 360 | /* clean up after the write, and free any memory allocated */ |
| 361 | png_destroy_write_struct(&png_ptr, &info_ptr); |
| 362 | return true; |
| 363 | } |
| 364 | |
Hal Canary | 1fcc404 | 2016-11-30 17:07:59 -0500 | [diff] [blame] | 365 | #endif |