// Creates an SkImage that is backed by SkDiscardablePixelRef.
PassRefPtr<SkImage> DeferredImageDecoder::createImage(size_t index, bool knownToBeOpaque) const
{
SkISize decodedSize = m_frameGenerator->getFullSize();
ASSERT(decodedSize.width() > 0);
ASSERT(decodedSize.height() > 0);
const SkImageInfo info = SkImageInfo::MakeN32(decodedSize.width(), decodedSize.height(),
knownToBeOpaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType);
DecodingImageGenerator* generator = new DecodingImageGenerator(m_frameGenerator, info, index);
RefPtr<SkImage> image = adoptRef(SkImage::NewFromGenerator(generator));
if (!image)
return nullptr;
generator->setGenerationId(image->uniqueID());
return image.release();
}
// Creates a SkBitmap that is backed by SkDiscardablePixelRef.
SkBitmap DeferredImageDecoder::createBitmap(size_t index)
{
SkISize decodedSize = m_frameGenerator->getFullSize();
ASSERT(decodedSize.width() > 0);
ASSERT(decodedSize.height() > 0);
#if SK_B32_SHIFT // Little-endian RGBA pixels. (Android)
const SkColorType colorType = kRGBA_8888_SkColorType;
#else
const SkColorType colorType = kBGRA_8888_SkColorType;
#endif
const SkImageInfo info = SkImageInfo::Make(decodedSize.width(), decodedSize.height(), colorType, kPremul_SkAlphaType);
SkBitmap bitmap;
DecodingImageGenerator* generator = new DecodingImageGenerator(m_frameGenerator, info, index);
bool installed = SkInstallDiscardablePixelRef(generator, &bitmap);
ASSERT_UNUSED(installed, installed);
bitmap.pixelRef()->setURI(labelDiscardable);
generator->setGenerationId(bitmap.getGenerationID());
return bitmap;
}
sk_sp<SkImage> DeferredImageDecoder::createFrameImageAtIndex(
size_t index,
bool knownToBeOpaque) {
const SkISize& decodedSize = m_frameGenerator->getFullSize();
ASSERT(decodedSize.width() > 0);
ASSERT(decodedSize.height() > 0);
sk_sp<SkROBuffer> roBuffer(m_rwBuffer->newRBufferSnapshot());
RefPtr<SegmentReader> segmentReader =
SegmentReader::createFromSkROBuffer(std::move(roBuffer));
SkImageInfo info = SkImageInfo::MakeN32(
decodedSize.width(), decodedSize.height(),
knownToBeOpaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType,
m_frameGenerator->getColorSpace());
DecodingImageGenerator* generator = new DecodingImageGenerator(
m_frameGenerator, info, segmentReader.release(), m_allDataReceived, index,
m_frameData[index].m_uniqueID);
sk_sp<SkImage> image = SkImage::MakeFromGenerator(
generator); // SkImage takes ownership of the generator.
if (!image)
return nullptr;
// We can consider decoded bitmap constant and reuse uniqueID only after all
// data is received. We reuse it also for multiframe images when image data
// is partially received but the frame data is fully received.
if (m_allDataReceived || m_frameData[index].m_isComplete) {
DCHECK(m_frameData[index].m_uniqueID ==
DecodingImageGenerator::kNeedNewImageUniqueID ||
m_frameData[index].m_uniqueID == image->uniqueID());
m_frameData[index].m_uniqueID = image->uniqueID();
}
generator->setCanYUVDecode(m_canYUVDecode);
return image;
}