| /* | |
| * Copyright 2015 Google Inc. | |
| * | |
| * Use of this source code is governed by a BSD-style license that can be | |
| * found in the LICENSE file. | |
| */ | |
| #include "include/codec/SkAndroidCodec.h" | |
| #include "include/codec/SkCodec.h" | |
| #include "include/core/SkPixmap.h" | |
| #include "src/codec/SkAndroidCodecAdapter.h" | |
| #include "src/codec/SkCodecPriv.h" | |
| #include "src/codec/SkSampledCodec.h" | |
| static bool is_valid_sample_size(int sampleSize) { | |
| // FIXME: As Leon has mentioned elsewhere, surely there is also a maximum sampleSize? | |
| return sampleSize > 0; | |
| } | |
| /** | |
| * Loads the gamut as a set of three points (triangle). | |
| */ | |
| static void load_gamut(SkPoint rgb[], const skcms_Matrix3x3& xyz) { | |
| // rx = rX / (rX + rY + rZ) | |
| // ry = rY / (rX + rY + rZ) | |
| // gx, gy, bx, and gy are calulcated similarly. | |
| for (int rgbIdx = 0; rgbIdx < 3; rgbIdx++) { | |
| float sum = xyz.vals[rgbIdx][0] + xyz.vals[rgbIdx][1] + xyz.vals[rgbIdx][2]; | |
| rgb[rgbIdx].fX = xyz.vals[rgbIdx][0] / sum; | |
| rgb[rgbIdx].fY = xyz.vals[rgbIdx][1] / sum; | |
| } | |
| } | |
| /** | |
| * Calculates the area of the triangular gamut. | |
| */ | |
| static float calculate_area(SkPoint abc[]) { | |
| SkPoint a = abc[0]; | |
| SkPoint b = abc[1]; | |
| SkPoint c = abc[2]; | |
| return 0.5f * SkTAbs(a.fX*b.fY + b.fX*c.fY - a.fX*c.fY - c.fX*b.fY - b.fX*a.fY); | |
| } | |
| static constexpr float kSRGB_D50_GamutArea = 0.084f; | |
| static bool is_wide_gamut(const skcms_ICCProfile& profile) { | |
| // Determine if the source image has a gamut that is wider than sRGB. If so, we | |
| // will use P3 as the output color space to avoid clipping the gamut. | |
| if (profile.has_toXYZD50) { | |
| SkPoint rgb[3]; | |
| load_gamut(rgb, profile.toXYZD50); | |
| return calculate_area(rgb) > kSRGB_D50_GamutArea; | |
| } | |
| return false; | |
| } | |
| SkAndroidCodec::SkAndroidCodec(SkCodec* codec) | |
| : fInfo(codec->getInfo()) | |
| , fCodec(codec) | |
| {} | |
| SkAndroidCodec::~SkAndroidCodec() {} | |
| std::unique_ptr<SkAndroidCodec> SkAndroidCodec::MakeFromStream(std::unique_ptr<SkStream> stream, | |
| SkPngChunkReader* chunkReader) { | |
| auto codec = SkCodec::MakeFromStream(std::move(stream), nullptr, chunkReader); | |
| return MakeFromCodec(std::move(codec)); | |
| } | |
| std::unique_ptr<SkAndroidCodec> SkAndroidCodec::MakeFromCodec(std::unique_ptr<SkCodec> codec) { | |
| if (nullptr == codec) { | |
| return nullptr; | |
| } | |
| switch ((SkEncodedImageFormat)codec->getEncodedFormat()) { | |
| case SkEncodedImageFormat::kPNG: | |
| case SkEncodedImageFormat::kICO: | |
| case SkEncodedImageFormat::kJPEG: | |
| #ifndef SK_HAS_WUFFS_LIBRARY | |
| case SkEncodedImageFormat::kGIF: | |
| #endif | |
| case SkEncodedImageFormat::kBMP: | |
| case SkEncodedImageFormat::kWBMP: | |
| case SkEncodedImageFormat::kHEIF: | |
| case SkEncodedImageFormat::kAVIF: | |
| return std::make_unique<SkSampledCodec>(codec.release()); | |
| #ifdef SK_HAS_WUFFS_LIBRARY | |
| case SkEncodedImageFormat::kGIF: | |
| #endif | |
| #ifdef SK_CODEC_DECODES_WEBP | |
| case SkEncodedImageFormat::kWEBP: | |
| #endif | |
| #ifdef SK_CODEC_DECODES_RAW | |
| case SkEncodedImageFormat::kDNG: | |
| #endif | |
| #if defined(SK_CODEC_DECODES_WEBP) || defined(SK_CODEC_DECODES_RAW) || defined(SK_HAS_WUFFS_LIBRARY) | |
| return std::make_unique<SkAndroidCodecAdapter>(codec.release()); | |
| #endif | |
| default: | |
| return nullptr; | |
| } | |
| } | |
| std::unique_ptr<SkAndroidCodec> SkAndroidCodec::MakeFromData(sk_sp<SkData> data, | |
| SkPngChunkReader* chunkReader) { | |
| if (!data) { | |
| return nullptr; | |
| } | |
| return MakeFromStream(SkMemoryStream::Make(std::move(data)), chunkReader); | |
| } | |
| SkColorType SkAndroidCodec::computeOutputColorType(SkColorType requestedColorType) { | |
| bool highPrecision = fCodec->getEncodedInfo().bitsPerComponent() > 8; | |
| switch (requestedColorType) { | |
| case kARGB_4444_SkColorType: | |
| return kN32_SkColorType; | |
| case kN32_SkColorType: | |
| break; | |
| case kAlpha_8_SkColorType: | |
| // Fall through to kGray_8. Before kGray_8_SkColorType existed, | |
| // we allowed clients to request kAlpha_8 when they wanted a | |
| // grayscale decode. | |
| case kGray_8_SkColorType: | |
| if (kGray_8_SkColorType == this->getInfo().colorType()) { | |
| return kGray_8_SkColorType; | |
| } | |
| break; | |
| case kRGB_565_SkColorType: | |
| if (kOpaque_SkAlphaType == this->getInfo().alphaType()) { | |
| return kRGB_565_SkColorType; | |
| } | |
| break; | |
| case kRGBA_F16_SkColorType: | |
| return kRGBA_F16_SkColorType; | |
| default: | |
| break; | |
| } | |
| // F16 is the Android default for high precision images. | |
| return highPrecision ? kRGBA_F16_SkColorType : kN32_SkColorType; | |
| } | |
| SkAlphaType SkAndroidCodec::computeOutputAlphaType(bool requestedUnpremul) { | |
| if (kOpaque_SkAlphaType == this->getInfo().alphaType()) { | |
| return kOpaque_SkAlphaType; | |
| } | |
| return requestedUnpremul ? kUnpremul_SkAlphaType : kPremul_SkAlphaType; | |
| } | |
| sk_sp<SkColorSpace> SkAndroidCodec::computeOutputColorSpace(SkColorType outputColorType, | |
| sk_sp<SkColorSpace> prefColorSpace) { | |
| switch (outputColorType) { | |
| case kRGBA_F16_SkColorType: | |
| case kRGB_565_SkColorType: | |
| case kRGBA_8888_SkColorType: | |
| case kBGRA_8888_SkColorType: { | |
| // If |prefColorSpace| is supplied, choose it. | |
| if (prefColorSpace) { | |
| return prefColorSpace; | |
| } | |
| const skcms_ICCProfile* encodedProfile = fCodec->getEncodedInfo().profile(); | |
| if (encodedProfile) { | |
| if (auto encodedSpace = SkColorSpace::Make(*encodedProfile)) { | |
| // Leave the pixels in the encoded color space. Color space conversion | |
| // will be handled after decode time. | |
| return encodedSpace; | |
| } | |
| if (is_wide_gamut(*encodedProfile)) { | |
| return SkColorSpace::MakeRGB(SkNamedTransferFn::kSRGB, SkNamedGamut::kDisplayP3); | |
| } | |
| } | |
| return SkColorSpace::MakeSRGB(); | |
| } | |
| default: | |
| // Color correction not supported for kGray. | |
| return nullptr; | |
| } | |
| } | |
| static bool supports_any_down_scale(const SkCodec* codec) { | |
| return codec->getEncodedFormat() == SkEncodedImageFormat::kWEBP; | |
| } | |
| // There are a variety of ways two SkISizes could be compared. This method | |
| // returns true if either dimensions of a is < that of b. | |
| // computeSampleSize also uses the opposite, which means that both | |
| // dimensions of a >= b. | |
| static inline bool smaller_than(const SkISize& a, const SkISize& b) { | |
| return a.width() < b.width() || a.height() < b.height(); | |
| } | |
| // Both dimensions of a > that of b. | |
| static inline bool strictly_bigger_than(const SkISize& a, const SkISize& b) { | |
| return a.width() > b.width() && a.height() > b.height(); | |
| } | |
| int SkAndroidCodec::computeSampleSize(SkISize* desiredSize) const { | |
| SkASSERT(desiredSize); | |
| const auto origDims = fCodec->dimensions(); | |
| if (!desiredSize || *desiredSize == origDims) { | |
| return 1; | |
| } | |
| if (smaller_than(origDims, *desiredSize)) { | |
| *desiredSize = origDims; | |
| return 1; | |
| } | |
| // Handle bad input: | |
| if (desiredSize->width() < 1 || desiredSize->height() < 1) { | |
| *desiredSize = SkISize::Make(std::max(1, desiredSize->width()), | |
| std::max(1, desiredSize->height())); | |
| } | |
| if (supports_any_down_scale(fCodec.get())) { | |
| return 1; | |
| } | |
| int sampleX = origDims.width() / desiredSize->width(); | |
| int sampleY = origDims.height() / desiredSize->height(); | |
| int sampleSize = std::min(sampleX, sampleY); | |
| auto computedSize = this->getSampledDimensions(sampleSize); | |
| if (computedSize == *desiredSize) { | |
| return sampleSize; | |
| } | |
| if (computedSize == origDims || sampleSize == 1) { | |
| // Cannot downscale | |
| *desiredSize = computedSize; | |
| return 1; | |
| } | |
| if (strictly_bigger_than(computedSize, *desiredSize)) { | |
| // See if there is a tighter fit. | |
| while (true) { | |
| auto smaller = this->getSampledDimensions(sampleSize + 1); | |
| if (smaller == *desiredSize) { | |
| return sampleSize + 1; | |
| } | |
| if (smaller == computedSize || smaller_than(smaller, *desiredSize)) { | |
| // Cannot get any smaller without being smaller than desired. | |
| *desiredSize = computedSize; | |
| return sampleSize; | |
| } | |
| sampleSize++; | |
| computedSize = smaller; | |
| } | |
| SkASSERT(false); | |
| } | |
| if (!smaller_than(computedSize, *desiredSize)) { | |
| // This means one of the computed dimensions is equal to desired, and | |
| // the other is bigger. This is as close as we can get. | |
| *desiredSize = computedSize; | |
| return sampleSize; | |
| } | |
| // computedSize is too small. Make it larger. | |
| while (sampleSize > 2) { | |
| auto bigger = this->getSampledDimensions(sampleSize - 1); | |
| if (bigger == *desiredSize || !smaller_than(bigger, *desiredSize)) { | |
| *desiredSize = bigger; | |
| return sampleSize - 1; | |
| } | |
| sampleSize--; | |
| } | |
| *desiredSize = origDims; | |
| return 1; | |
| } | |
| SkISize SkAndroidCodec::getSampledDimensions(int sampleSize) const { | |
| if (!is_valid_sample_size(sampleSize)) { | |
| return {0, 0}; | |
| } | |
| // Fast path for when we are not scaling. | |
| if (1 == sampleSize) { | |
| return fCodec->dimensions(); | |
| } | |
| return this->onGetSampledDimensions(sampleSize); | |
| } | |
| bool SkAndroidCodec::getSupportedSubset(SkIRect* desiredSubset) const { | |
| if (!desiredSubset || !is_valid_subset(*desiredSubset, fCodec->dimensions())) { | |
| return false; | |
| } | |
| return this->onGetSupportedSubset(desiredSubset); | |
| } | |
| SkISize SkAndroidCodec::getSampledSubsetDimensions(int sampleSize, const SkIRect& subset) const { | |
| if (!is_valid_sample_size(sampleSize)) { | |
| return {0, 0}; | |
| } | |
| // We require that the input subset is a subset that is supported by SkAndroidCodec. | |
| // We test this by calling getSupportedSubset() and verifying that no modifications | |
| // are made to the subset. | |
| SkIRect copySubset = subset; | |
| if (!this->getSupportedSubset(©Subset) || copySubset != subset) { | |
| return {0, 0}; | |
| } | |
| // If the subset is the entire image, for consistency, use getSampledDimensions(). | |
| if (fCodec->dimensions() == subset.size()) { | |
| return this->getSampledDimensions(sampleSize); | |
| } | |
| // This should perhaps call a virtual function, but currently both of our subclasses | |
| // want the same implementation. | |
| return {get_scaled_dimension(subset.width(), sampleSize), | |
| get_scaled_dimension(subset.height(), sampleSize)}; | |
| } | |
| SkCodec::Result SkAndroidCodec::getAndroidPixels(const SkImageInfo& requestInfo, | |
| void* requestPixels, size_t requestRowBytes, const AndroidOptions* options) { | |
| if (!requestPixels) { | |
| return SkCodec::kInvalidParameters; | |
| } | |
| if (requestRowBytes < requestInfo.minRowBytes()) { | |
| return SkCodec::kInvalidParameters; | |
| } | |
| AndroidOptions defaultOptions; | |
| if (!options) { | |
| options = &defaultOptions; | |
| } else { | |
| if (options->fSubset) { | |
| if (!is_valid_subset(*options->fSubset, fCodec->dimensions())) { | |
| return SkCodec::kInvalidParameters; | |
| } | |
| if (SkIRect::MakeSize(fCodec->dimensions()) == *options->fSubset) { | |
| // The caller wants the whole thing, rather than a subset. Modify | |
| // the AndroidOptions passed to onGetAndroidPixels to not specify | |
| // a subset. | |
| defaultOptions = *options; | |
| defaultOptions.fSubset = nullptr; | |
| options = &defaultOptions; | |
| } | |
| } | |
| } | |
| if (auto result = fCodec->handleFrameIndex(requestInfo, requestPixels, requestRowBytes, | |
| *options, this); result != SkCodec::kSuccess) { | |
| return result; | |
| } | |
| return this->onGetAndroidPixels(requestInfo, requestPixels, requestRowBytes, *options); | |
| } | |
| SkCodec::Result SkAndroidCodec::getAndroidPixels(const SkImageInfo& info, void* pixels, | |
| size_t rowBytes) { | |
| return this->getAndroidPixels(info, pixels, rowBytes, nullptr); | |
| } |