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; 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); }