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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/graphics/gpu/image_extractor.h"
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/renderer/platform/graphics/skia/skia_utils.h"
#include "third_party/blink/renderer/platform/image-decoders/image_decoder.h"
#include "third_party/skia/include/core/SkColorSpace.h"
#include "third_party/skia/include/core/SkImage.h"
namespace blink {
namespace {
bool FrameIsValid(const SkBitmap& frame_bitmap) {
if (frame_bitmap.isNull()) {
return false;
}
if (frame_bitmap.empty()) {
return false;
}
if (frame_bitmap.colorType() != kN32_SkColorType &&
frame_bitmap.colorType() != kRGBA_F16_SkColorType) {
return false;
}
return true;
}
} // anonymous namespace
ImageExtractor::ImageExtractor(Image* image,
SkAlphaType target_alpha_type,
sk_sp<SkColorSpace> target_color_space) {
if (!image) {
return;
}
const auto& paint_image = image->PaintImageForCurrentFrame();
sk_sp<SkImage> skia_image = paint_image.GetSwSkImage();
if (skia_image && !skia_image->colorSpace()) {
skia_image = skia_image->reinterpretColorSpace(SkColorSpace::MakeSRGB());
}
if (image->HasData()) {
bool paint_image_is_f16 =
paint_image.GetColorType() == kRGBA_F16_SkColorType;
// If there already exists a decoded image in `skia_image`, determine if we
// can re-use that image. If we can't, then we need to re-decode the image
// here.
bool needs_redecode = false;
// A BitmapImage indicates that this is a coded backed image but non-decoded
// yet. Decode the image here.
if (image->IsBitmapImage()) {
needs_redecode = true;
}
if (skia_image) {
// The `target_color_space` is set to nullptr iff
// UNPACK_COLORSPACE_CONVERSION is NONE, which means that the color
// profile of the image should be ignored. In this case, always re-decode,
// because we can't reliably know that `skia_image` ignored the image's
// color profile when it was created.
if (!target_color_space) {
needs_redecode = true;
}
// If there is a target color space, but the SkImage that was decoded is
// not already in this color space, then re-decode the image. The reason
// for this is that repeated color converisons may accumulate clamping and
// rounding errors.
if (target_color_space &&
!SkColorSpace::Equals(skia_image->colorSpace(),
target_color_space.get())) {
needs_redecode = true;
}
// If the image was decoded with premultipled alpha and unpremultipled
// alpha was requested, then re-decode without premultiplying alpha. Don't
// bother re-decoding if premultiply alpha was requested, because we will
// do that lossy conversion later.
if (skia_image->alphaType() == kPremul_SkAlphaType &&
target_alpha_type != kPremul_SkAlphaType) {
needs_redecode = true;
}
// If the image is high bit depth, but was not decoded as high bit depth,
// then re-decode the image.
if (paint_image_is_f16 &&
skia_image->colorType() != kRGBA_F16_SkColorType) {
needs_redecode = true;
}
} else {
// If the image has not been decoded yet, then it needs to be decoded.
needs_redecode = true;
}
if (needs_redecode) {
const bool data_complete = true;
// Always decode as unpremultiplied. If premultiplication is desired, it
// will be applied later.
const auto alpha_option = ImageDecoder::kAlphaNotPremultiplied;
// Decode to the paint image's bit depth. If conversion is needed, it will
// be applied later.
const auto bit_depth = paint_image_is_f16
? ImageDecoder::kHighBitDepthToHalfFloat
: ImageDecoder::kDefaultBitDepth;
// If we are not ignoring the color space, then tag the image with the
// target color space. It will be converted later on.
const auto color_behavior =
target_color_space ? ColorBehavior::kTag : ColorBehavior::kIgnore;
// Decode the image here on the main thread.
std::unique_ptr<ImageDecoder> decoder(ImageDecoder::Create(
image->Data(), data_complete, alpha_option, bit_depth, color_behavior,
cc::AuxImage::kDefault, Platform::GetMaxDecodedImageBytes()));
if (!decoder || !decoder->FrameCount()) {
return;
}
ImageFrame* frame = decoder->DecodeFrameBufferAtIndex(0);
if (!frame || frame->GetStatus() != ImageFrame::kFrameComplete) {
return;
}
SkBitmap bitmap = frame->Bitmap();
if (!FrameIsValid(bitmap)) {
return;
}
// TODO(fmalita): Partial frames are not supported currently: only fully
// decoded frames make it through. We could potentially relax this and
// use SkImages::RasterFromBitmap(bitmap) to make a copy.
skia_image = frame->FinalizePixelsAndGetImage();
}
}
if (!skia_image) {
return;
}
DCHECK(skia_image->width());
DCHECK(skia_image->height());
// Fail if the image was downsampled because of memory limits.
if (skia_image->width() != image->width() ||
skia_image->height() != image->height()) {
return;
}
sk_image_ = std::move(skia_image);
}
} // namespace blink
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