191 lines
8.1 KiB
C++
191 lines
8.1 KiB
C++
// Copyright 2019 Google LLC.
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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#include "include/core/SkICC.h"
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#include "include/core/SkString.h"
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#include "tools/HashAndEncode.h"
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#include <png.h>
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static sk_sp<SkColorSpace> rec2020() {
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return SkColorSpace::MakeRGB(SkNamedTransferFn::kRec2020, SkNamedGamut::kRec2020);
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}
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HashAndEncode::HashAndEncode(const SkBitmap& bitmap) : fSize(bitmap.info().dimensions()) {
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skcms_AlphaFormat srcAlpha;
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switch (bitmap.alphaType()) {
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case kUnknown_SkAlphaType: return;
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case kOpaque_SkAlphaType:
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case kUnpremul_SkAlphaType: srcAlpha = skcms_AlphaFormat_Unpremul; break;
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case kPremul_SkAlphaType: srcAlpha = skcms_AlphaFormat_PremulAsEncoded; break;
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}
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skcms_PixelFormat srcFmt;
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switch (bitmap.colorType()) {
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case kUnknown_SkColorType: return;
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case kAlpha_8_SkColorType: srcFmt = skcms_PixelFormat_A_8; break;
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case kRGB_565_SkColorType: srcFmt = skcms_PixelFormat_BGR_565; break;
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case kARGB_4444_SkColorType: srcFmt = skcms_PixelFormat_ABGR_4444; break;
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case kRGBA_8888_SkColorType: srcFmt = skcms_PixelFormat_RGBA_8888; break;
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case kBGRA_8888_SkColorType: srcFmt = skcms_PixelFormat_BGRA_8888; break;
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case kSRGBA_8888_SkColorType: srcFmt = skcms_PixelFormat_RGBA_8888_sRGB; break;
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case kRGBA_1010102_SkColorType: srcFmt = skcms_PixelFormat_RGBA_1010102; break;
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case kBGRA_1010102_SkColorType: srcFmt = skcms_PixelFormat_BGRA_1010102; break;
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case kGray_8_SkColorType: srcFmt = skcms_PixelFormat_G_8; break;
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// skcms doesn't have R_8. Pretend it's G_8, but see below for color space trickery:
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case kR8_unorm_SkColorType: srcFmt = skcms_PixelFormat_G_8; break;
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case kRGBA_F16Norm_SkColorType: srcFmt = skcms_PixelFormat_RGBA_hhhh; break;
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case kRGBA_F16_SkColorType: srcFmt = skcms_PixelFormat_RGBA_hhhh; break;
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case kRGBA_F32_SkColorType: srcFmt = skcms_PixelFormat_RGBA_ffff; break;
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case kR16G16B16A16_unorm_SkColorType: srcFmt = skcms_PixelFormat_RGBA_16161616LE; break;
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case kRGB_888x_SkColorType: srcFmt = skcms_PixelFormat_RGBA_8888;
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srcAlpha = skcms_AlphaFormat_Opaque; break;
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case kRGB_101010x_SkColorType: srcFmt = skcms_PixelFormat_RGBA_1010102;
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srcAlpha = skcms_AlphaFormat_Opaque; break;
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case kBGR_101010x_SkColorType: srcFmt = skcms_PixelFormat_BGRA_1010102;
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srcAlpha = skcms_AlphaFormat_Opaque; break;
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case kR8G8_unorm_SkColorType: return;
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case kR16G16_unorm_SkColorType: return;
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case kR16G16_float_SkColorType: return;
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case kA16_unorm_SkColorType: return;
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case kA16_float_SkColorType: return;
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}
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skcms_ICCProfile srcProfile = *skcms_sRGB_profile();
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if (auto cs = bitmap.colorSpace()) {
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cs->toProfile(&srcProfile);
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}
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// NOTE: If the color type is R8, we told skcms it's actually G8 above. To get red PNGs,
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// we tweak the source color space to throw away any green and blue:
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if (bitmap.colorType() == kR8_unorm_SkColorType) {
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srcProfile.toXYZD50.vals[0][1] = srcProfile.toXYZD50.vals[0][2] = 0;
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srcProfile.toXYZD50.vals[1][1] = srcProfile.toXYZD50.vals[1][2] = 0;
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srcProfile.toXYZD50.vals[2][1] = srcProfile.toXYZD50.vals[2][2] = 0;
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}
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// Our common format that can represent anything we draw and encode as a PNG:
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// - 16-bit big-endian RGBA
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// - unpremul
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// - Rec. 2020 gamut and transfer function
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skcms_PixelFormat dstFmt = skcms_PixelFormat_RGBA_16161616BE;
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skcms_AlphaFormat dstAlpha = skcms_AlphaFormat_Unpremul;
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skcms_ICCProfile dstProfile;
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rec2020()->toProfile(&dstProfile);
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int N = fSize.width() * fSize.height();
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fPixels.reset(new uint64_t[N]);
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const void* src = bitmap.getPixels();
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void* dst = fPixels.get();
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while (N > 0) {
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int todo = std::min(N, 1<<27); // Keep todo*8 <= 1B; skcms requires N*bpp < MAX_INT.
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if (!skcms_Transform(src, srcFmt, srcAlpha, &srcProfile,
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dst, dstFmt, dstAlpha, &dstProfile, todo)) {
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SkASSERT(false);
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fPixels.reset(nullptr);
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break;
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}
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src = (char*)src + todo*SkColorTypeBytesPerPixel(bitmap.colorType());
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dst = (char*)dst + todo*sizeof(uint64_t);
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N -= todo;
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}
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}
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void HashAndEncode::feedHash(SkWStream* st) const {
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st->write(&fSize, sizeof(fSize));
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if (const uint64_t* px = fPixels.get()) {
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st->write(px, sizeof(*px) * fSize.width() * fSize.height());
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}
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// N.B. changing salt will change the hash of all images produced by DM,
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// and will cause tens of thousands of new images to be uploaded to Gold.
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int salt = 1;
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st->write(&salt, sizeof(salt));
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}
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// NOTE: HashAndEncode uses libpng directly rather than through an abstraction
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// like SkPngEncoder to make sure we get stable, portable results independent
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// of any changes to Skia production encoder.
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bool HashAndEncode::encodePNG(SkWStream* st,
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const char* md5,
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CommandLineFlags::StringArray key,
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CommandLineFlags::StringArray properties) const {
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if (!fPixels) {
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return false;
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}
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png_structp png = png_create_write_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
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if (!png) {
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return false;
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}
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png_infop info = png_create_info_struct(png);
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if (!info) {
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png_destroy_write_struct(&png, &info);
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return false;
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}
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auto write_to_stream = +[](png_structp png, png_bytep ptr, png_size_t len) {
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auto st = (SkWStream*)png_get_io_ptr(png);
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if (!st->write(ptr, len)) {
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png_error(png, "HashAndEncode::encodePNG() failed writing stream");
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}
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};
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png_set_write_fn(png, st, write_to_stream, nullptr);
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SkString description;
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description.append("Key: ");
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for (int i = 0; i < key.count(); i++) {
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description.appendf("%s ", key[i]);
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}
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description.append("Properties: ");
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for (int i = 0; i < properties.count(); i++) {
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description.appendf("%s ", properties[i]);
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}
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description.appendf("MD5: %s", md5);
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png_text text[2];
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text[0].key = (png_charp)"Author";
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text[0].text = (png_charp)"DM unified Rec.2020";
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text[0].compression = PNG_TEXT_COMPRESSION_NONE;
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text[1].key = (png_charp)"Description";
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text[1].text = (png_charp)description.c_str();
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text[1].compression = PNG_TEXT_COMPRESSION_NONE;
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png_set_text(png, info, text, SK_ARRAY_COUNT(text));
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png_set_IHDR(png, info, (png_uint_32)fSize.width()
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, (png_uint_32)fSize.height()
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, 16/*bits per channel*/
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, PNG_COLOR_TYPE_RGB_ALPHA
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, PNG_INTERLACE_NONE
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, PNG_COMPRESSION_TYPE_DEFAULT
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, PNG_FILTER_TYPE_DEFAULT);
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// Fastest encoding and decoding, at slight file size cost is no filtering, compression 1.
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png_set_filter(png, PNG_FILTER_TYPE_BASE, PNG_FILTER_NONE);
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png_set_compression_level(png, 1);
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static const sk_sp<SkData> profile =
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SkWriteICCProfile(SkNamedTransferFn::kRec2020, SkNamedGamut::kRec2020);
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png_set_iCCP(png, info,
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"Rec.2020",
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0/*compression type... no idea what options are available here*/,
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(png_const_bytep)profile->data(),
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(png_uint_32) profile->size());
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png_write_info(png, info);
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for (int y = 0; y < fSize.height(); y++) {
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png_write_row(png, (png_bytep)(fPixels.get() + y*fSize.width()));
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}
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png_write_end(png, info);
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png_destroy_write_struct(&png, &info);
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return true;
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}
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