bool GraphicsContext3D::ImageExtractor::extractImage(bool premultiplyAlpha, bool ignoreGammaAndColorProfile)
{
if (!m_image)
return false;
m_skiaImage = m_image->nativeImageForCurrentFrame();
m_alphaOp = AlphaDoNothing;
bool hasAlpha = m_skiaImage ? !m_skiaImage->bitmap().isOpaque() : true;
if ((!m_skiaImage || ignoreGammaAndColorProfile || (hasAlpha && !premultiplyAlpha)) && m_image->data()) {
// Attempt to get raw unpremultiplied image data.
OwnPtr<ImageDecoder> decoder(ImageDecoder::create(
*(m_image->data()), ImageSource::AlphaNotPremultiplied,
ignoreGammaAndColorProfile ? ImageSource::GammaAndColorProfileIgnored : ImageSource::GammaAndColorProfileApplied));
if (!decoder)
return false;
decoder->setData(m_image->data(), true);
if (!decoder->frameCount())
return false;
ImageFrame* frame = decoder->frameBufferAtIndex(0);
if (!frame || frame->status() != ImageFrame::FrameComplete)
return false;
hasAlpha = frame->hasAlpha();
m_nativeImage = adoptPtr(frame->asNewNativeImage());
if (!m_nativeImage.get() || !m_nativeImage->isDataComplete() || !m_nativeImage->bitmap().width() || !m_nativeImage->bitmap().height())
return false;
SkBitmap::Config skiaConfig = m_nativeImage->bitmap().config();
if (skiaConfig != SkBitmap::kARGB_8888_Config)
return false;
m_skiaImage = m_nativeImage.get();
if (hasAlpha && premultiplyAlpha)
m_alphaOp = AlphaDoPremultiply;
} else if (!premultiplyAlpha && hasAlpha) {
// 1. For texImage2D with HTMLVideoElment input, assume no PremultiplyAlpha had been applied and the alpha value for each pixel is 0xFF
// which is true at present and may be changed in the future and needs adjustment accordingly.
// 2. For texImage2D with HTMLCanvasElement input in which Alpha is already Premultiplied in this port,
// do AlphaDoUnmultiply if UNPACK_PREMULTIPLY_ALPHA_WEBGL is set to false.
if (m_imageHtmlDomSource != HtmlDomVideo)
m_alphaOp = AlphaDoUnmultiply;
}
if (!m_skiaImage)
return false;
m_imageSourceFormat = SK_B32_SHIFT ? DataFormatRGBA8 : DataFormatBGRA8;
m_imageWidth = m_skiaImage->bitmap().width();
m_imageHeight = m_skiaImage->bitmap().height();
if (!m_imageWidth || !m_imageHeight)
return false;
m_imageSourceUnpackAlignment = 0;
m_skiaImage->bitmap().lockPixels();
m_imagePixelData = m_skiaImage->bitmap().getPixels();
return true;
}
NativeImagePtr ImageSource::createFrameAtIndex(size_t index)
{
if (!m_decoder)
return 0;
ImageFrame* buffer = m_decoder->frameBufferAtIndex(index);
if (!buffer || buffer->status() == ImageFrame::FrameEmpty)
return 0;
// Zero-height images can cause problems for some ports. If we have an
// empty image dimension, just bail.
if (size().isEmpty())
return 0;
// Return the buffer contents as a native image. For some ports, the data
// is already in a native container, and this just increments its refcount.
return buffer->asNewNativeImage();
}
WebImage WebImage::fromData(const WebData& data, const WebSize& desiredSize)
{
RefPtr<SharedBuffer> buffer = PassRefPtr<SharedBuffer>(data);
OwnPtr<ImageDecoder> decoder(ImageDecoder::create(*buffer.get(), ImageSource::AlphaPremultiplied, ImageSource::GammaAndColorProfileIgnored));
if (!decoder)
return WebImage();
decoder->setData(buffer.get(), true);
if (!decoder->isSizeAvailable())
return WebImage();
// Frames are arranged by decreasing size, then decreasing bit depth.
// Pick the frame closest to |desiredSize|'s area without being smaller,
// which has the highest bit depth.
const size_t frameCount = decoder->frameCount();
size_t index = 0; // Default to first frame if none are large enough.
int frameAreaAtIndex = 0;
for (size_t i = 0; i < frameCount; ++i) {
const IntSize frameSize = decoder->frameSizeAtIndex(i);
if (WebSize(frameSize) == desiredSize) {
index = i;
break; // Perfect match.
}
const int frameArea = frameSize.width() * frameSize.height();
if (frameArea < (desiredSize.width * desiredSize.height))
break; // No more frames that are large enough.
if (!i || (frameArea < frameAreaAtIndex)) {
index = i; // Closer to desired area than previous best match.
frameAreaAtIndex = frameArea;
}
}
ImageFrame* frame = decoder->frameBufferAtIndex(index);
if (!frame)
return WebImage();
RefPtr<NativeImageSkia> image = frame->asNewNativeImage();
if (!image)
return WebImage();
return WebImage(image->bitmap());
}
WebVector<WebImage> WebImage::framesFromData(const WebData& data)
{
// This is to protect from malicious images. It should be big enough that it's never hit in pracice.
const size_t maxFrameCount = 8;
RefPtr<SharedBuffer> buffer = PassRefPtr<SharedBuffer>(data);
OwnPtr<ImageDecoder> decoder(ImageDecoder::create(*buffer.get(), ImageSource::AlphaPremultiplied, ImageSource::GammaAndColorProfileIgnored));
if (!decoder)
return WebVector<WebImage>();
decoder->setData(buffer.get(), true);
if (!decoder->isSizeAvailable())
return WebVector<WebImage>();
// Frames are arranged by decreasing size, then decreasing bit depth.
// Keep the first frame at every size, has the highest bit depth.
const size_t frameCount = decoder->frameCount();
IntSize lastSize;
Vector<WebImage> frames;
for (size_t i = 0; i < std::min(frameCount, maxFrameCount); ++i) {
const IntSize frameSize = decoder->frameSizeAtIndex(i);
if (frameSize == lastSize)
continue;
lastSize = frameSize;
ImageFrame* frame = decoder->frameBufferAtIndex(i);
if (!frame)
continue;
RefPtr<NativeImageSkia> image = frame->asNewNativeImage();
if (image && image->isDataComplete())
frames.append(WebImage(image->bitmap()));
}
return frames;
}
