bool ImageSource::frameHasAlphaAtIndex(size_t index)
{
#ifdef ANDROID_ANIMATED_GIF
if (m_decoder.m_gifDecoder) {
ImageFrame* buffer =
m_decoder.m_gifDecoder->frameBufferAtIndex(index);
if (!buffer || buffer->status() == ImageFrame::FrameEmpty)
return false;
return buffer->hasAlpha();
}
#else
SkASSERT(0 == index);
#endif
if (NULL == m_decoder.m_image)
return true; // if we're not sure, assume the worse-case
const PrivateAndroidImageSourceRec& decoder = *m_decoder.m_image;
// if we're 16bit, we know even without all the data available
if (decoder.bitmap().getConfig() == SkBitmap::kRGB_565_Config)
return false;
if (!decoder.fAllDataReceived)
return true; // if we're not sure, assume the worse-case
return !decoder.bitmap().isOpaque();
}
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;
}