| /* |
| * 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" |
| #include "src/core/SkPixmapPriv.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; |
| } |
| |
| static inline SkImageInfo adjust_info(SkCodec* codec, |
| SkAndroidCodec::ExifOrientationBehavior orientationBehavior) { |
| auto info = codec->getInfo(); |
| if (orientationBehavior == SkAndroidCodec::ExifOrientationBehavior::kIgnore |
| || !SkPixmapPriv::ShouldSwapWidthHeight(codec->getOrigin())) { |
| return info; |
| } |
| return SkPixmapPriv::SwapWidthHeight(info); |
| } |
| |
| SkAndroidCodec::SkAndroidCodec(SkCodec* codec, ExifOrientationBehavior orientationBehavior) |
| : fInfo(adjust_info(codec, orientationBehavior)) |
| , fOrientationBehavior(orientationBehavior) |
| , 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, |
| ExifOrientationBehavior orientationBehavior) { |
| 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: |
| return std::make_unique<SkSampledCodec>(codec.release(), orientationBehavior); |
| #ifdef SK_HAS_WUFFS_LIBRARY |
| case SkEncodedImageFormat::kGIF: |
| #endif |
| #ifdef SK_HAS_WEBP_LIBRARY |
| case SkEncodedImageFormat::kWEBP: |
| #endif |
| #ifdef SK_CODEC_DECODES_RAW |
| case SkEncodedImageFormat::kDNG: |
| #endif |
| #if defined(SK_HAS_WEBP_LIBRARY) || defined(SK_CODEC_DECODES_RAW) || defined(SK_HAS_WUFFS_LIBRARY) |
| return std::make_unique<SkAndroidCodecAdapter>(codec.release(), orientationBehavior); |
| #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::kDCIP3); |
| } |
| } |
| |
| 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); |
| |
| if (!desiredSize || *desiredSize == fInfo.dimensions()) { |
| return 1; |
| } |
| |
| if (smaller_than(fInfo.dimensions(), *desiredSize)) { |
| *desiredSize = fInfo.dimensions(); |
| 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 = fInfo.width() / desiredSize->width(); |
| int sampleY = fInfo.height() / desiredSize->height(); |
| int sampleSize = std::min(sampleX, sampleY); |
| auto computedSize = this->getSampledDimensions(sampleSize); |
| if (computedSize == *desiredSize) { |
| return sampleSize; |
| } |
| |
| if (computedSize == fInfo.dimensions() || 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 = fInfo.dimensions(); |
| 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 fInfo.dimensions(); |
| } |
| |
| auto dims = this->onGetSampledDimensions(sampleSize); |
| if (fOrientationBehavior == SkAndroidCodec::ExifOrientationBehavior::kIgnore |
| || !SkPixmapPriv::ShouldSwapWidthHeight(fCodec->getOrigin())) { |
| return dims; |
| } |
| |
| return { dims.height(), dims.width() }; |
| } |
| |
| bool SkAndroidCodec::getSupportedSubset(SkIRect* desiredSubset) const { |
| if (!desiredSubset || !is_valid_subset(*desiredSubset, fInfo.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 (fInfo.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)}; |
| } |
| |
| static bool acceptable_result(SkCodec::Result result) { |
| switch (result) { |
| // These results mean a partial or complete image. They should be considered |
| // a success by SkPixmapPriv. |
| case SkCodec::kSuccess: |
| case SkCodec::kIncompleteInput: |
| case SkCodec::kErrorInInput: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| 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; |
| } |
| |
| SkImageInfo adjustedInfo = fInfo; |
| if (ExifOrientationBehavior::kRespect == fOrientationBehavior |
| && SkPixmapPriv::ShouldSwapWidthHeight(fCodec->getOrigin())) { |
| adjustedInfo = SkPixmapPriv::SwapWidthHeight(adjustedInfo); |
| } |
| |
| AndroidOptions defaultOptions; |
| if (!options) { |
| options = &defaultOptions; |
| } else if (options->fSubset) { |
| if (!is_valid_subset(*options->fSubset, adjustedInfo.dimensions())) { |
| return SkCodec::kInvalidParameters; |
| } |
| |
| if (SkIRect::MakeSize(adjustedInfo.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 (ExifOrientationBehavior::kIgnore == fOrientationBehavior) { |
| return this->onGetAndroidPixels(requestInfo, requestPixels, requestRowBytes, *options); |
| } |
| |
| SkCodec::Result result; |
| auto decode = [this, options, &result](const SkPixmap& pm) { |
| result = this->onGetAndroidPixels(pm.info(), pm.writable_addr(), pm.rowBytes(), *options); |
| return acceptable_result(result); |
| }; |
| |
| SkPixmap dst(requestInfo, requestPixels, requestRowBytes); |
| if (SkPixmapPriv::Orient(dst, fCodec->getOrigin(), decode)) { |
| return result; |
| } |
| |
| // Orient returned false. If onGetAndroidPixels succeeded, then Orient failed internally. |
| if (acceptable_result(result)) { |
| return SkCodec::kInternalError; |
| } |
| |
| return result; |
| } |
| |
| SkCodec::Result SkAndroidCodec::getAndroidPixels(const SkImageInfo& info, void* pixels, |
| size_t rowBytes) { |
| return this->getAndroidPixels(info, pixels, rowBytes, nullptr); |
| } |
