static CGImageRef CreateCGImageFromPixelBuffer(QTPixelBuffer buffer)
{
#if USE(ACCELERATED_COMPOSITING)
CGDataProviderRef provider = 0;
CGColorSpaceRef colorSpace = 0;
CGImageRef image = 0;
size_t bitsPerComponent = 0;
size_t bitsPerPixel = 0;
CGImageAlphaInfo alphaInfo = kCGImageAlphaNone;
if (buffer.pixelFormatIs32BGRA()) {
bitsPerComponent = 8;
bitsPerPixel = 32;
alphaInfo = (CGImageAlphaInfo)(kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Little);
} else if (buffer.pixelFormatIs32ARGB()) {
bitsPerComponent = 8;
bitsPerPixel = 32;
alphaInfo = (CGImageAlphaInfo)(kCGImageAlphaNoneSkipLast | kCGBitmapByteOrder32Big);
} else {
// All other pixel formats are currently unsupported:
ASSERT_NOT_REACHED();
}
CGDataProviderDirectAccessCallbacks callbacks = {
&QTPixelBuffer::dataProviderGetBytePointerCallback,
&QTPixelBuffer::dataProviderReleaseBytePointerCallback,
&QTPixelBuffer::dataProviderGetBytesAtPositionCallback,
&QTPixelBuffer::dataProviderReleaseInfoCallback,
};
// Colorspace should be device, so that Quartz does not have to do an extra render.
colorSpace = CGColorSpaceCreateDeviceRGB();
require(colorSpace, Bail);
provider = CGDataProviderCreateDirectAccess(buffer.pixelBufferRef(), buffer.dataSize(), &callbacks);
require(provider, Bail);
// CGDataProvider does not retain the buffer, but it will release it later, so do an extra retain here:
QTPixelBuffer::retainCallback(buffer.pixelBufferRef());
image = CGImageCreate(buffer.width(), buffer.height(), bitsPerComponent, bitsPerPixel, buffer.bytesPerRow(), colorSpace, alphaInfo, provider, 0, false, kCGRenderingIntentDefault);
Bail:
// Once the image is created we can release our reference to the provider and the colorspace, they are retained by the image
if (provider)
CGDataProviderRelease(provider);
if (colorSpace)
CGColorSpaceRelease(colorSpace);
return image;
#else
return 0;
#endif
}
void MediaPlayerPrivateQuickTimeVisualContext::paint(GraphicsContext* p, const IntRect& r)
{
MediaRenderingMode currentMode = currentRenderingMode();
if (currentMode == MediaRenderingNone)
return;
if (currentMode == MediaRenderingSoftwareRenderer && !m_visualContext)
return;
QTPixelBuffer buffer = m_visualContext->imageForTime(0);
if (buffer.pixelBufferRef()) {
#if USE(ACCELERATED_COMPOSITING)
if (m_qtVideoLayer) {
// We are probably being asked to render the video into a canvas, but
// there's a good chance the QTPixelBuffer is not ARGB and thus can't be
// drawn using CG. If so, fire up an ICMDecompressionSession and convert
// the current frame into something which can be rendered by CG.
if (!buffer.pixelFormatIs32ARGB() && !buffer.pixelFormatIs32BGRA()) {
// The decompression session will only decompress a specific pixelFormat
// at a specific width and height; if these differ, the session must be
// recreated with the new parameters.
if (!m_decompressionSession || !m_decompressionSession->canDecompress(buffer))
m_decompressionSession = QTDecompressionSession::create(buffer.pixelFormatType(), buffer.width(), buffer.height());
buffer = m_decompressionSession->decompress(buffer);
}
}
#endif
CGImageRef image = CreateCGImageFromPixelBuffer(buffer);
CGContextRef context = p->platformContext();
CGContextSaveGState(context);
CGContextTranslateCTM(context, r.x(), r.y());
CGContextTranslateCTM(context, 0, r.height());
CGContextScaleCTM(context, 1, -1);
CGContextDrawImage(context, CGRectMake(0, 0, r.width(), r.height()), image);
CGContextRestoreGState(context);
CGImageRelease(image);
}
paintCompleted(*p, r);
}
