// 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 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 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; }