예제 #1
0
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);
}
예제 #2
0
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());
}
예제 #3
0
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());
}
예제 #4
0
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);
}
예제 #5
0
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);
}