String ImageBuffer::toDataURL(const String& mimeType, const double* quality) const
{
ASSERT(MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType));
RetainPtr<CGImageRef> image(AdoptCF, copyNativeImage(CopyBackingStore));
if (!image)
return "data:,";
return CGImageToDataURL(image.get(), mimeType, quality);
}
void ImageBuffer::clip(GraphicsContext* contextToClip, const FloatRect& rect) const
{
CGContextRef platformContextToClip = contextToClip->platformContext();
// FIXME: This image needs to be grayscale to be used as an alpha mask here.
RetainPtr<CGImageRef> image(AdoptCF, copyNativeImage(DontCopyBackingStore));
CGContextTranslateCTM(platformContextToClip, rect.x(), rect.y() + rect.height());
CGContextScaleCTM(platformContextToClip, 1, -1);
CGContextClipToMask(platformContextToClip, FloatRect(FloatPoint(), rect.size()), image.get());
CGContextScaleCTM(platformContextToClip, 1, -1);
CGContextTranslateCTM(platformContextToClip, -rect.x(), -rect.y() - rect.height());
}
RefPtr<Image> ImageBuffer::copyImage(BackingStoreCopy copyBehavior, ScaleBehavior scaleBehavior) const
{
RetainPtr<CGImageRef> image;
if (m_resolutionScale == 1 || scaleBehavior == Unscaled) {
image = copyNativeImage(copyBehavior);
image = createCroppedImageIfNecessary(image.get(), internalSize());
} else {
image = copyNativeImage(DontCopyBackingStore);
RetainPtr<CGContextRef> context = adoptCF(CGBitmapContextCreate(0, logicalSize().width(), logicalSize().height(), 8, 4 * logicalSize().width(), deviceRGBColorSpaceRef(), kCGImageAlphaPremultipliedLast));
CGContextSetBlendMode(context.get(), kCGBlendModeCopy);
CGContextClipToRect(context.get(), FloatRect(FloatPoint::zero(), logicalSize()));
FloatSize imageSizeInUserSpace = scaleSizeToUserSpace(logicalSize(), m_data.backingStoreSize, internalSize());
CGContextDrawImage(context.get(), FloatRect(FloatPoint::zero(), imageSizeInUserSpace), image.get());
image = adoptCF(CGBitmapContextCreateImage(context.get()));
}
if (!image)
return nullptr;
return BitmapImage::create(image.get());
}
String ImageBuffer::toDataURL(const String& mimeType, const double* quality, CoordinateSystem) const
{
ASSERT(MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType));
RetainPtr<CFStringRef> uti = utiFromMIMEType(mimeType);
ASSERT(uti);
RefPtr<Uint8ClampedArray> premultipliedData;
RetainPtr<CGImageRef> image;
if (CFEqual(uti.get(), jpegUTI())) {
// JPEGs don't have an alpha channel, so we have to manually composite on top of black.
premultipliedData = getPremultipliedImageData(IntRect(IntPoint(0, 0), logicalSize()));
if (!premultipliedData)
return "data:,";
RetainPtr<CGDataProviderRef> dataProvider;
dataProvider.adoptCF(CGDataProviderCreateWithData(0, premultipliedData->data(), 4 * logicalSize().width() * logicalSize().height(), 0));
if (!dataProvider)
return "data:,";
image.adoptCF(CGImageCreate(logicalSize().width(), logicalSize().height(), 8, 32, 4 * logicalSize().width(),
deviceRGBColorSpaceRef(), kCGBitmapByteOrderDefault | kCGImageAlphaNoneSkipLast,
dataProvider.get(), 0, false, kCGRenderingIntentDefault));
} else if (m_resolutionScale == 1)
image.adoptCF(copyNativeImage(CopyBackingStore));
else {
image.adoptCF(copyNativeImage(DontCopyBackingStore));
RetainPtr<CGContextRef> context(AdoptCF, CGBitmapContextCreate(0, logicalSize().width(), logicalSize().height(), 8, 4 * logicalSize().width(), deviceRGBColorSpaceRef(), kCGImageAlphaPremultipliedLast));
CGContextSetBlendMode(context.get(), kCGBlendModeCopy);
CGContextDrawImage(context.get(), CGRectMake(0, 0, logicalSize().width(), logicalSize().height()), image.get());
image.adoptCF(CGBitmapContextCreateImage(context.get()));
}
return CGImageToDataURL(image.get(), mimeType, quality);
}
void ImageBuffer::clip(GraphicsContext& contextToClip, const FloatRect& rect) const
{
FloatSize backingStoreSizeInUserSpace = scaleSizeToUserSpace(rect.size(), m_data.backingStoreSize, internalSize());
RetainPtr<CGImageRef> image = copyNativeImage(DontCopyBackingStore);
contextToClip.clipToNativeImage(image.get(), rect, backingStoreSizeInUserSpace);
}
