static String CGImageToDataURL(CGImageRef image, const String& mimeType, const double* quality)
{
RetainPtr<CFMutableDataRef> data(AdoptCF, CFDataCreateMutable(kCFAllocatorDefault, 0));
if (!data)
return "data:,";
RetainPtr<CFStringRef> uti = utiFromMIMEType(mimeType);
ASSERT(uti);
RetainPtr<CGImageDestinationRef> destination(AdoptCF, CGImageDestinationCreateWithData(data.get(), uti.get(), 1, 0));
if (!destination)
return "data:,";
RetainPtr<CFDictionaryRef> imageProperties = 0;
if (CFEqual(uti.get(), jpegUTI()) && quality && *quality >= 0.0 && *quality <= 1.0) {
// Apply the compression quality to the image destination.
RetainPtr<CFNumberRef> compressionQuality(AdoptCF, CFNumberCreate(kCFAllocatorDefault, kCFNumberDoubleType, quality));
const void* key = kCGImageDestinationLossyCompressionQuality;
const void* value = compressionQuality.get();
imageProperties.adoptCF(CFDictionaryCreate(0, &key, &value, 1, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks));
}
// Setting kCGImageDestinationBackgroundColor to black in imageProperties would allow saving some math in the
// calling functions, but it doesn't seem to work.
CGImageDestinationAddImage(destination.get(), image, imageProperties.get());
CGImageDestinationFinalize(destination.get());
Vector<char> out;
base64Encode(reinterpret_cast<const char*>(CFDataGetBytePtr(data.get())), CFDataGetLength(data.get()), out);
return "data:" + mimeType + ";base64," + out;
}
String ImageBuffer::toDataURL(const String& mimeType, const double* quality) const
{
ASSERT(MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType));
RetainPtr<CGImageRef> image;
RetainPtr<CFStringRef> uti = utiFromMIMEType(mimeType);
ASSERT(uti);
RefPtr<ByteArray> arr;
if (CFEqual(uti.get(), jpegUTI())) {
// JPEGs don't have an alpha channel, so we have to manually composite on top of black.
arr = getPremultipliedImageData(IntRect(IntPoint(0, 0), internalSize()));
unsigned char *data = arr->data();
for (int i = 0; i < internalSize().width() * internalSize().height(); i++)
data[i * 4 + 3] = 255; // The image is already premultiplied, so we just need to make it opaque.
RetainPtr<CGDataProviderRef> dataProvider;
dataProvider.adoptCF(CGDataProviderCreateWithData(0, data, 4 * internalSize().width() * internalSize().height(), 0));
if (!dataProvider)
return "data:,";
image.adoptCF(CGImageCreate(internalSize().width(), internalSize().height(), 8, 32, 4 * internalSize().width(),
CGColorSpaceCreateDeviceRGB(), kCGBitmapByteOrderDefault | kCGImageAlphaLast,
dataProvider.get(), 0, false, kCGRenderingIntentDefault));
} else
image.adoptCF(copyNativeImage(CopyBackingStore));
if (!image)
return "data:,";
return CGImageToDataURL(image.get(), mimeType, quality);
}
String ImageDataToDataURL(const ImageData& source, const String& mimeType, const double* quality)
{
ASSERT(MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType));
RetainPtr<CGImageRef> image;
RetainPtr<CGDataProviderRef> dataProvider;
unsigned char* data = source.data()->data()->data();
RetainPtr<CFStringRef> uti = utiFromMIMEType(mimeType);
ASSERT(uti);
Vector<uint8_t> dataVector;
if (CFEqual(uti.get(), jpegUTI())) {
// JPEGs don't have an alpha channel, so we have to manually composite on top of black.
dataVector.resize(4 * source.width() * source.height());
unsigned char *out = dataVector.data();
for (int i = 0; i < source.width() * source.height(); i++) {
// Multiply color data by alpha, and set alpha to 255.
int alpha = data[4 * i + 3];
if (alpha != 255) {
out[4 * i + 0] = data[4 * i + 0] * alpha / 255;
out[4 * i + 1] = data[4 * i + 1] * alpha / 255;
out[4 * i + 2] = data[4 * i + 2] * alpha / 255;
} else {
out[4 * i + 0] = data[4 * i + 0];
out[4 * i + 1] = data[4 * i + 1];
out[4 * i + 2] = data[4 * i + 2];
}
out[4 * i + 3] = 255;
}
data = out;
}
dataProvider.adoptCF(CGDataProviderCreateWithData(0, data,
4 * source.width() * source.height(), 0));
if (!dataProvider)
return "data:,";
image.adoptCF(CGImageCreate(source.width(), source.height(), 8, 32, 4 * source.width(),
CGColorSpaceCreateDeviceRGB(), kCGBitmapByteOrderDefault | kCGImageAlphaLast,
dataProvider.get(), 0, false, kCGRenderingIntentDefault));
if (!image)
return "data:,";
return CGImageToDataURL(image.get(), mimeType, quality);
}
static String CGImageToDataURL(CGImageRef image, const String& mimeType, const double* quality)
{
RetainPtr<CFStringRef> uti = utiFromMIMEType(mimeType);
ASSERT(uti);
RetainPtr<CFMutableDataRef> data = adoptCF(CFDataCreateMutable(kCFAllocatorDefault, 0));
if (!CGImageEncodeToData(image, uti.get(), quality, data.get()))
return "data:,";
Vector<char> base64Data;
base64Encode(CFDataGetBytePtr(data.get()), CFDataGetLength(data.get()), base64Data);
return "data:" + mimeType + ";base64," + base64Data;
}
String ImageDataToDataURL(const ImageData& source, const String& mimeType, const double* quality)
{
ASSERT(MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType));
RetainPtr<CFStringRef> uti = utiFromMIMEType(mimeType);
ASSERT(uti);
CGImageAlphaInfo dataAlphaInfo = kCGImageAlphaLast;
unsigned char* data = source.data()->data();
Vector<uint8_t> premultipliedData;
if (CFEqual(uti.get(), jpegUTI())) {
// JPEGs don't have an alpha channel, so we have to manually composite on top of black.
size_t size = 4 * source.width() * source.height();
if (!premultipliedData.tryReserveCapacity(size))
return "data:,";
premultipliedData.resize(size);
unsigned char *buffer = premultipliedData.data();
for (size_t i = 0; i < size; i += 4) {
unsigned alpha = data[i + 3];
if (alpha != 255) {
buffer[i + 0] = data[i + 0] * alpha / 255;
buffer[i + 1] = data[i + 1] * alpha / 255;
buffer[i + 2] = data[i + 2] * alpha / 255;
} else {
buffer[i + 0] = data[i + 0];
buffer[i + 1] = data[i + 1];
buffer[i + 2] = data[i + 2];
}
}
dataAlphaInfo = kCGImageAlphaNoneSkipLast; // Ignore the alpha channel.
data = premultipliedData.data();
}
RetainPtr<CGDataProviderRef> dataProvider;
dataProvider = adoptCF(CGDataProviderCreateWithData(0, data, 4 * source.width() * source.height(), 0));
if (!dataProvider)
return "data:,";
RetainPtr<CGImageRef> image;
image = adoptCF(CGImageCreate(source.width(), source.height(), 8, 32, 4 * source.width(),
deviceRGBColorSpaceRef(), kCGBitmapByteOrderDefault | dataAlphaInfo,
dataProvider.get(), 0, false, kCGRenderingIntentDefault));
return CGImageToDataURL(image.get(), mimeType, quality);
}
String ImageBuffer::toDataURL(const String& mimeType, const double* quality) const
{
ASSERT(MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType));
RetainPtr<CGImageRef> image;
if (!m_accelerateRendering)
image.adoptCF(CGBitmapContextCreateImage(context()->platformContext()));
#if USE(IOSURFACE_CANVAS_BACKING_STORE)
else
image.adoptCF(wkIOSurfaceContextCreateImage(context()->platformContext()));
#endif
if (!image)
return "data:,";
RetainPtr<CFMutableDataRef> data(AdoptCF, CFDataCreateMutable(kCFAllocatorDefault, 0));
if (!data)
return "data:,";
RetainPtr<CFStringRef> uti = utiFromMIMEType(mimeType);
ASSERT(uti);
RetainPtr<CGImageDestinationRef> destination(AdoptCF, CGImageDestinationCreateWithData(data.get(), uti.get(), 1, 0));
if (!destination)
return "data:,";
RetainPtr<CFDictionaryRef> imageProperties = 0;
if (CFEqual(uti.get(), jpegUTI()) && quality && *quality >= 0.0 && *quality <= 1.0) {
// Apply the compression quality to the image destination.
RetainPtr<CFNumberRef> compressionQuality(AdoptCF, CFNumberCreate(kCFAllocatorDefault, kCFNumberDoubleType, quality));
const void* key = kCGImageDestinationLossyCompressionQuality;
const void* value = compressionQuality.get();
imageProperties.adoptCF(CFDictionaryCreate(0, &key, &value, 1, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks));
}
CGImageDestinationAddImage(destination.get(), image.get(), imageProperties.get());
CGImageDestinationFinalize(destination.get());
Vector<char> out;
base64Encode(reinterpret_cast<const char*>(CFDataGetBytePtr(data.get())), CFDataGetLength(data.get()), out);
return makeString("data:", mimeType, ";base64,", out);
}
String ImageBuffer::toDataURL(const String& mimeType, const double* quality, CoordinateSystem) const
{
ASSERT(MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType));
if (context().isAcceleratedContext())
flushContext();
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 = copyNativeImage(CopyBackingStore);
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(), CGRectMake(0, 0, logicalSize().width(), logicalSize().height()));
FloatSize imageSizeInUserSpace = scaleSizeToUserSpace(logicalSize(), m_data.backingStoreSize, internalSize());
CGContextDrawImage(context.get(), CGRectMake(0, 0, imageSizeInUserSpace.width(), imageSizeInUserSpace.height()), image.get());
image = adoptCF(CGBitmapContextCreateImage(context.get()));
}
return CGImageToDataURL(image.get(), mimeType, quality);
}
String ImageBuffer::toDataURL(const String& mimeType) const
{
ASSERT(MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType));
RetainPtr<CGImageRef> image(AdoptCF, CGBitmapContextCreateImage(context()->platformContext()));
if (!image)
return "data:,";
size_t width = CGImageGetWidth(image.get());
size_t height = CGImageGetHeight(image.get());
OwnArrayPtr<uint32_t> imageData(new uint32_t[width * height]);
if (!imageData)
return "data:,";
RetainPtr<CGImageRef> transformedImage(AdoptCF, CGBitmapContextCreateImage(context()->platformContext()));
if (!transformedImage)
return "data:,";
RetainPtr<CFMutableDataRef> transformedImageData(AdoptCF, CFDataCreateMutable(kCFAllocatorDefault, 0));
if (!transformedImageData)
return "data:,";
RetainPtr<CGImageDestinationRef> imageDestination(AdoptCF, CGImageDestinationCreateWithData(transformedImageData.get(),
utiFromMIMEType(mimeType).get(), 1, 0));
if (!imageDestination)
return "data:,";
CGImageDestinationAddImage(imageDestination.get(), transformedImage.get(), 0);
CGImageDestinationFinalize(imageDestination.get());
Vector<char> in;
in.append(CFDataGetBytePtr(transformedImageData.get()), CFDataGetLength(transformedImageData.get()));
Vector<char> out;
base64Encode(in, out);
out.append('\0');
return String::format("data:%s;base64,%s", mimeType.utf8().data(), out.data());
}
