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- // Copyright 2019 Google LLC.
- // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
- #include "include/core/SkICC.h"
- #include "include/core/SkString.h"
- #include "tools/HashAndEncode.h"
- #include "png.h"
- static sk_sp<SkColorSpace> rec2020() {
- return SkColorSpace::MakeRGB(SkNamedTransferFn::kRec2020, SkNamedGamut::kRec2020);
- }
- HashAndEncode::HashAndEncode(const SkBitmap& bitmap) : fSize(bitmap.info().dimensions()) {
- skcms_AlphaFormat srcAlpha;
- switch (bitmap.alphaType()) {
- case kUnknown_SkAlphaType: return;
- case kOpaque_SkAlphaType:
- case kUnpremul_SkAlphaType: srcAlpha = skcms_AlphaFormat_Unpremul; break;
- case kPremul_SkAlphaType: srcAlpha = skcms_AlphaFormat_PremulAsEncoded; break;
- }
- skcms_PixelFormat srcFmt;
- switch (bitmap.colorType()) {
- case kUnknown_SkColorType: return;
- case kAlpha_8_SkColorType: srcFmt = skcms_PixelFormat_A_8; break;
- case kRGB_565_SkColorType: srcFmt = skcms_PixelFormat_BGR_565; break;
- case kARGB_4444_SkColorType: srcFmt = skcms_PixelFormat_ABGR_4444; break;
- case kRGBA_8888_SkColorType: srcFmt = skcms_PixelFormat_RGBA_8888; break;
- case kBGRA_8888_SkColorType: srcFmt = skcms_PixelFormat_BGRA_8888; break;
- case kRGBA_1010102_SkColorType: srcFmt = skcms_PixelFormat_RGBA_1010102; break;
- case kGray_8_SkColorType: srcFmt = skcms_PixelFormat_G_8; break;
- case kRGBA_F16Norm_SkColorType: srcFmt = skcms_PixelFormat_RGBA_hhhh; break;
- case kRGBA_F16_SkColorType: srcFmt = skcms_PixelFormat_RGBA_hhhh; break;
- case kRGBA_F32_SkColorType: srcFmt = skcms_PixelFormat_RGBA_ffff; break;
- case kRGB_888x_SkColorType: srcFmt = skcms_PixelFormat_RGBA_8888;
- srcAlpha = skcms_AlphaFormat_Opaque; break;
- case kRGB_101010x_SkColorType: srcFmt = skcms_PixelFormat_RGBA_1010102;
- srcAlpha = skcms_AlphaFormat_Opaque; break;
- }
- skcms_ICCProfile srcProfile = *skcms_sRGB_profile();
- if (auto cs = bitmap.colorSpace()) {
- cs->toProfile(&srcProfile);
- }
- // Our common format that can represent anything we draw and encode as a PNG:
- // - 16-bit big-endian RGBA
- // - unpremul
- // - Rec. 2020 gamut and transfer function
- skcms_PixelFormat dstFmt = skcms_PixelFormat_RGBA_16161616BE;
- skcms_AlphaFormat dstAlpha = skcms_AlphaFormat_Unpremul;
- skcms_ICCProfile dstProfile;
- rec2020()->toProfile(&dstProfile);
- int N = fSize.width() * fSize.height();
- fPixels.reset(new uint64_t[N]);
- if (!skcms_Transform(bitmap.getPixels(), srcFmt, srcAlpha, &srcProfile,
- fPixels.get(), dstFmt, dstAlpha, &dstProfile, N)) {
- SkASSERT(false);
- fPixels.reset(nullptr);
- }
- }
- void HashAndEncode::write(SkWStream* st) const {
- st->write(&fSize, sizeof(fSize));
- if (const uint64_t* px = fPixels.get()) {
- st->write(px, sizeof(*px) * fSize.width() * fSize.height());
- }
- // N.B. changing salt will change the hash of all images produced by DM,
- // and will cause tens of thousands of new images to be uploaded to Gold.
- int salt = 1;
- st->write(&salt, sizeof(salt));
- }
- bool HashAndEncode::writePngTo(const char* path,
- const char* md5,
- CommandLineFlags::StringArray key,
- CommandLineFlags::StringArray properties) const {
- if (!fPixels) {
- return false;
- }
- FILE* f = fopen(path, "wb");
- if (!f) {
- return false;
- }
- png_structp png = png_create_write_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
- if (!png) {
- fclose(f);
- return false;
- }
- png_infop info = png_create_info_struct(png);
- if (!info) {
- png_destroy_write_struct(&png, &info);
- fclose(f);
- return false;
- }
- SkString description;
- description.append("Key: ");
- for (int i = 0; i < key.count(); i++) {
- description.appendf("%s ", key[i]);
- }
- description.append("Properties: ");
- for (int i = 0; i < properties.count(); i++) {
- description.appendf("%s ", properties[i]);
- }
- description.appendf("MD5: %s", md5);
- png_text text[2];
- text[0].key = (png_charp)"Author";
- text[0].text = (png_charp)"DM unified Rec.2020";
- text[0].compression = PNG_TEXT_COMPRESSION_NONE;
- text[1].key = (png_charp)"Description";
- text[1].text = (png_charp)description.c_str();
- text[1].compression = PNG_TEXT_COMPRESSION_NONE;
- png_set_text(png, info, text, SK_ARRAY_COUNT(text));
- png_init_io(png, f);
- png_set_IHDR(png, info, (png_uint_32)fSize.width()
- , (png_uint_32)fSize.height()
- , 16/*bits per channel*/
- , PNG_COLOR_TYPE_RGB_ALPHA
- , PNG_INTERLACE_NONE
- , PNG_COMPRESSION_TYPE_DEFAULT
- , PNG_FILTER_TYPE_DEFAULT);
- // Fastest encoding and decoding, at slight file size cost is no filtering, compression 1.
- png_set_filter(png, PNG_FILTER_TYPE_BASE, PNG_FILTER_NONE);
- png_set_compression_level(png, 1);
- static const sk_sp<SkData> profile =
- SkWriteICCProfile(SkNamedTransferFn::kRec2020, SkNamedGamut::kRec2020);
- png_set_iCCP(png, info,
- "Rec.2020",
- 0/*compression type... no idea what options are available here*/,
- (png_const_bytep)profile->data(),
- (png_uint_32) profile->size());
- png_write_info(png, info);
- for (int y = 0; y < fSize.height(); y++) {
- png_write_row(png, (png_bytep)(fPixels.get() + y*fSize.width()));
- }
- png_write_end(png, info);
- png_destroy_write_struct(&png, &info);
- fclose(f);
- return true;
- }
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