Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 534 insertions, 0 deletions

diff --git a/Source/WebCore/platform/graphics/cg/ImageBufferCG.cpp b/Source/WebCore/platform/graphics/cg/ImageBufferCG.cpp
new file mode 100644
index 0000000..75a36e5
--- /dev/null
+++ b/Source/WebCore/platform/graphics/cg/ImageBufferCG.cpp
@@ -0,0 +1,534 @@
+/*
+ * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
+ * Copyright (C) 2008 Apple Inc. All rights reserved.
+ * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "ImageBuffer.h"
+
+#include "Base64.h"
+#include "BitmapImage.h"
+#include "GraphicsContext.h"
+#include "GraphicsContextCG.h"
+#include "MIMETypeRegistry.h"
+#include <ApplicationServices/ApplicationServices.h>
+#include <wtf/Assertions.h>
+#include <wtf/text/StringConcatenate.h>
+#include <wtf/OwnArrayPtr.h>
+#include <wtf/RetainPtr.h>
+#include <wtf/Threading.h>
+#include <math.h>
+
+#if USE(IOSURFACE_CANVAS_BACKING_STORE)
+#include <IOSurface/IOSurface.h>
+#endif
+
+#if PLATFORM(MAC) || PLATFORM(CHROMIUM)
+#include "WebCoreSystemInterface.h"
+#endif
+
+using namespace std;
+
+namespace WebCore {
+
+#if USE(IOSURFACE_CANVAS_BACKING_STORE)
+static RetainPtr<IOSurfaceRef> createIOSurface(const IntSize& size)
+{
+    unsigned pixelFormat = 'BGRA';
+    unsigned bytesPerElement = 4;
+    int width = size.width();
+    int height = size.height();
+
+    unsigned long bytesPerRow = IOSurfaceAlignProperty(kIOSurfaceBytesPerRow, size.width() * bytesPerElement);
+    if (!bytesPerRow)
+        return 0;
+
+    unsigned long allocSize = IOSurfaceAlignProperty(kIOSurfaceAllocSize, size.height() * bytesPerRow);
+    if (!allocSize)
+        return 0;
+
+    const void *keys[6];
+    const void *values[6];
+    keys[0] = kIOSurfaceWidth;
+    values[0] = CFNumberCreate(0, kCFNumberIntType, &width);
+    keys[1] = kIOSurfaceHeight;
+    values[1] = CFNumberCreate(0, kCFNumberIntType, &height);
+    keys[2] = kIOSurfacePixelFormat;
+    values[2] = CFNumberCreate(0, kCFNumberIntType, &pixelFormat);
+    keys[3] = kIOSurfaceBytesPerElement;
+    values[3] = CFNumberCreate(0, kCFNumberIntType, &bytesPerElement);
+    keys[4] = kIOSurfaceBytesPerRow;
+    values[4] = CFNumberCreate(0, kCFNumberLongType, &bytesPerRow);
+    keys[5] = kIOSurfaceAllocSize;
+    values[5] = CFNumberCreate(0, kCFNumberLongType, &allocSize);
+
+    RetainPtr<CFDictionaryRef> dict(AdoptCF, CFDictionaryCreate(0, keys, values, 6, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks));
+    for (unsigned i = 0; i < 6; i++)
+        CFRelease(values[i]);
+
+    return RetainPtr<IOSurfaceRef>(AdoptCF, IOSurfaceCreate(dict.get()));
+}
+#endif
+
+static void releaseImageData(void*, const void* data, size_t)
+{
+    fastFree(const_cast<void*>(data));
+}
+
+ImageBufferData::ImageBufferData(const IntSize&)
+    : m_data(0)
+#if USE(IOSURFACE_CANVAS_BACKING_STORE)
+    , m_surface(0)
+#endif
+{
+}
+
+ImageBuffer::ImageBuffer(const IntSize& size, ColorSpace imageColorSpace, RenderingMode renderingMode, bool& success)
+    : m_data(size)
+    , m_size(size)
+    , m_accelerateRendering(renderingMode == Accelerated)
+{
+#if !USE(IOSURFACE_CANVAS_BACKING_STORE)
+    ASSERT(renderingMode == Unaccelerated);
+#endif
+    success = false;  // Make early return mean failure.
+    if (size.width() < 0 || size.height() < 0)
+        return;
+
+    unsigned bytesPerRow = size.width();
+    if (bytesPerRow > 0x3FFFFFFF) // Protect against overflow
+        return;
+    bytesPerRow *= 4;
+    m_data.m_bytesPerRow = bytesPerRow;
+    size_t dataSize = size.height() * bytesPerRow;
+
+    switch (imageColorSpace) {
+    case ColorSpaceDeviceRGB:
+        m_data.m_colorSpace = deviceRGBColorSpaceRef();
+        break;
+    case ColorSpaceSRGB:
+        m_data.m_colorSpace = sRGBColorSpaceRef();
+        break;
+    case ColorSpaceLinearRGB:
+        m_data.m_colorSpace = linearRGBColorSpaceRef();
+        break;
+    }
+
+    RetainPtr<CGContextRef> cgContext;
+    if (!m_accelerateRendering) {
+        if (!tryFastCalloc(size.height(), bytesPerRow).getValue(m_data.m_data))
+            return;
+        ASSERT(!(reinterpret_cast<size_t>(m_data.m_data) & 2));
+
+        m_data.m_bitmapInfo = kCGImageAlphaPremultipliedLast;
+        cgContext.adoptCF(CGBitmapContextCreate(m_data.m_data, size.width(), size.height(), 8, bytesPerRow, m_data.m_colorSpace, m_data.m_bitmapInfo));
+        // Create a live image that wraps the data.
+        m_data.m_dataProvider.adoptCF(CGDataProviderCreateWithData(0, m_data.m_data, dataSize, releaseImageData));
+    } else {
+#if USE(IOSURFACE_CANVAS_BACKING_STORE)
+        m_data.m_surface = createIOSurface(size);
+        cgContext.adoptCF(wkIOSurfaceContextCreate(m_data.m_surface.get(), size.width(), size.height(), m_data.m_colorSpace));
+#else
+        m_accelerateRendering = false; // Force to false on older platforms
+#endif
+    }
+
+    if (!cgContext)
+        return;
+
+    m_context.set(new GraphicsContext(cgContext.get()));
+    m_context->scale(FloatSize(1, -1));
+    m_context->translate(0, -size.height());
+    success = true;
+}
+
+ImageBuffer::~ImageBuffer()
+{
+}
+
+GraphicsContext* ImageBuffer::context() const
+{
+    return m_context.get();
+}
+
+bool ImageBuffer::drawsUsingCopy() const
+{
+    return false;
+}
+
+PassRefPtr<Image> ImageBuffer::copyImage() const
+{
+    // BitmapImage will release the passed in CGImage on destruction
+    CGImageRef ctxImage = 0;
+    if (!m_accelerateRendering)
+        ctxImage = CGBitmapContextCreateImage(context()->platformContext());
+#if USE(IOSURFACE_CANVAS_BACKING_STORE)
+    else
+        ctxImage = wkIOSurfaceContextCreateImage(context()->platformContext());
+#endif
+    return BitmapImage::create(ctxImage);
+}
+
+static CGImageRef cgImage(const IntSize& size, const ImageBufferData& data)
+{
+    return CGImageCreate(size.width(), size.height(), 8, 32, data.m_bytesPerRow,
+                         data.m_colorSpace, data.m_bitmapInfo, data.m_dataProvider.get(), 0, true, kCGRenderingIntentDefault);
+}
+
+void ImageBuffer::draw(GraphicsContext* destContext, ColorSpace styleColorSpace, const FloatRect& destRect, const FloatRect& srcRect,
+                       CompositeOperator op, bool useLowQualityScale)
+{
+    if (!m_accelerateRendering) {
+        if (destContext == context()) {
+            // We're drawing into our own buffer.  In order for this to work, we need to copy the source buffer first.
+            RefPtr<Image> copy = copyImage();
+            destContext->drawImage(copy.get(), ColorSpaceDeviceRGB, destRect, srcRect, op, useLowQualityScale);
+        } else {
+            RefPtr<Image> imageForRendering = BitmapImage::create(cgImage(m_size, m_data));
+            destContext->drawImage(imageForRendering.get(), styleColorSpace, destRect, srcRect, op, useLowQualityScale);
+        }
+    } else {
+        RefPtr<Image> copy = copyImage();
+        ColorSpace colorSpace = (destContext == context()) ? ColorSpaceDeviceRGB : styleColorSpace;
+        destContext->drawImage(copy.get(), colorSpace, destRect, srcRect, op, useLowQualityScale);
+    }
+}
+
+void ImageBuffer::drawPattern(GraphicsContext* destContext, const FloatRect& srcRect, const AffineTransform& patternTransform,
+                              const FloatPoint& phase, ColorSpace styleColorSpace, CompositeOperator op, const FloatRect& destRect)
+{
+    if (!m_accelerateRendering) {
+        if (destContext == context()) {
+            // We're drawing into our own buffer.  In order for this to work, we need to copy the source buffer first.
+            RefPtr<Image> copy = copyImage();
+            copy->drawPattern(destContext, srcRect, patternTransform, phase, styleColorSpace, op, destRect);
+        } else {
+            RefPtr<Image> imageForRendering = BitmapImage::create(cgImage(m_size, m_data));
+            imageForRendering->drawPattern(destContext, srcRect, patternTransform, phase, styleColorSpace, op, destRect);
+        }
+    } else {
+        RefPtr<Image> copy = copyImage();
+        copy->drawPattern(destContext, srcRect, patternTransform, phase, styleColorSpace, op, destRect);
+    }
+}
+
+void ImageBuffer::clip(GraphicsContext* context, const FloatRect& rect) const
+{
+    CGContextRef platformContext = context->platformContext();
+    RetainPtr<CGImageRef> image;
+    if (!m_accelerateRendering)
+        image.adoptCF(cgImage(m_size, m_data));
+#if USE(IOSURFACE_CANVAS_BACKING_STORE)
+    else
+        image.adoptCF(wkIOSurfaceContextCreateImage(platformContext));
+#endif
+    CGContextTranslateCTM(platformContext, rect.x(), rect.y() + rect.height());
+    CGContextScaleCTM(platformContext, 1, -1);
+    CGContextClipToMask(platformContext, FloatRect(FloatPoint(), rect.size()), image.get());
+    CGContextScaleCTM(platformContext, 1, -1);
+    CGContextTranslateCTM(platformContext, -rect.x(), -rect.y() - rect.height());
+}
+
+template <Multiply multiplied>
+PassRefPtr<ByteArray> getImageData(const IntRect& rect, const ImageBufferData& imageData, const IntSize& size, bool accelerateRendering)
+{
+    RefPtr<ByteArray> result = ByteArray::create(rect.width() * rect.height() * 4);
+    unsigned char* data = result->data();
+
+    if (rect.x() < 0 || rect.y() < 0 || rect.right() > size.width() || rect.bottom() > size.height())
+        memset(data, 0, result->length());
+
+    int originx = rect.x();
+    int destx = 0;
+    if (originx < 0) {
+        destx = -originx;
+        originx = 0;
+    }
+    int endx = rect.right();
+    if (endx > size.width())
+        endx = size.width();
+    int numColumns = endx - originx;
+
+    int originy = rect.y();
+    int desty = 0;
+    if (originy < 0) {
+        desty = -originy;
+        originy = 0;
+    }
+    int endy = rect.bottom();
+    if (endy > size.height())
+        endy = size.height();
+    int numRows = endy - originy;
+    
+    unsigned destBytesPerRow = 4 * rect.width();
+    unsigned char* destRows = data + desty * destBytesPerRow + destx * 4;
+
+    unsigned srcBytesPerRow;
+    unsigned char* srcRows;
+
+    if (!accelerateRendering) {
+        srcBytesPerRow = 4 * size.width();
+        srcRows = reinterpret_cast<unsigned char*>(imageData.m_data) + originy * srcBytesPerRow + originx * 4;
+        
+        for (int y = 0; y < numRows; ++y) {
+            for (int x = 0; x < numColumns; x++) {
+                int basex = x * 4;
+                unsigned char alpha = srcRows[basex + 3];
+                if (multiplied == Unmultiplied && alpha) {
+                    destRows[basex] = (srcRows[basex] * 255) / alpha;
+                    destRows[basex + 1] = (srcRows[basex + 1] * 255) / alpha;
+                    destRows[basex + 2] = (srcRows[basex + 2] * 255) / alpha;
+                    destRows[basex + 3] = alpha;
+                } else
+                    reinterpret_cast<uint32_t*>(destRows + basex)[0] = reinterpret_cast<uint32_t*>(srcRows + basex)[0];
+            }
+            srcRows += srcBytesPerRow;
+            destRows += destBytesPerRow;
+        }
+    } else {
+#if USE(IOSURFACE_CANVAS_BACKING_STORE)
+        IOSurfaceRef surface = imageData.m_surface.get();
+        IOSurfaceLock(surface, kIOSurfaceLockReadOnly, 0);
+        srcBytesPerRow = IOSurfaceGetBytesPerRow(surface);
+        srcRows = (unsigned char*)(IOSurfaceGetBaseAddress(surface)) + originy * srcBytesPerRow + originx * 4;
+        
+        for (int y = 0; y < numRows; ++y) {
+            for (int x = 0; x < numColumns; x++) {
+                int basex = x * 4;
+                unsigned char alpha = srcRows[basex + 3];
+                if (multiplied == Unmultiplied && alpha) {
+                    destRows[basex] = (srcRows[basex + 2] * 255) / alpha;
+                    destRows[basex + 1] = (srcRows[basex + 1] * 255) / alpha;
+                    destRows[basex + 2] = (srcRows[basex] * 255) / alpha;
+                    destRows[basex + 3] = alpha;
+                } else {
+                    destRows[basex] = srcRows[basex + 2];
+                    destRows[basex + 1] = srcRows[basex + 1];
+                    destRows[basex + 2] = srcRows[basex];
+                    destRows[basex + 3] = alpha;
+                }
+            }
+            srcRows += srcBytesPerRow;
+            destRows += destBytesPerRow;
+        }
+        IOSurfaceUnlock(surface, kIOSurfaceLockReadOnly, 0);
+#else
+        ASSERT_NOT_REACHED();
+#endif
+    }
+    
+    return result.release();
+}
+
+PassRefPtr<ByteArray> ImageBuffer::getUnmultipliedImageData(const IntRect& rect) const
+{
+    if (m_accelerateRendering)
+        CGContextFlush(context()->platformContext());
+    return getImageData<Unmultiplied>(rect, m_data, m_size, m_accelerateRendering);
+}
+
+PassRefPtr<ByteArray> ImageBuffer::getPremultipliedImageData(const IntRect& rect) const
+{
+    if (m_accelerateRendering)
+        CGContextFlush(context()->platformContext());
+    return getImageData<Premultiplied>(rect, m_data, m_size, m_accelerateRendering);
+}
+
+template <Multiply multiplied>
+void putImageData(ByteArray*& source, const IntSize& sourceSize, const IntRect& sourceRect, const IntPoint& destPoint, ImageBufferData& imageData, const IntSize& size, bool accelerateRendering)
+{
+    ASSERT(sourceRect.width() > 0);
+    ASSERT(sourceRect.height() > 0);
+
+    int originx = sourceRect.x();
+    int destx = destPoint.x() + sourceRect.x();
+    ASSERT(destx >= 0);
+    ASSERT(destx < size.width());
+    ASSERT(originx >= 0);
+    ASSERT(originx <= sourceRect.right());
+
+    int endx = destPoint.x() + sourceRect.right();
+    ASSERT(endx <= size.width());
+
+    int numColumns = endx - destx;
+
+    int originy = sourceRect.y();
+    int desty = destPoint.y() + sourceRect.y();
+    ASSERT(desty >= 0);
+    ASSERT(desty < size.height());
+    ASSERT(originy >= 0);
+    ASSERT(originy <= sourceRect.bottom());
+
+    int endy = destPoint.y() + sourceRect.bottom();
+    ASSERT(endy <= size.height());
+    int numRows = endy - desty;
+
+    unsigned srcBytesPerRow = 4 * sourceSize.width();
+    unsigned char* srcRows = source->data() + originy * srcBytesPerRow + originx * 4;
+    unsigned destBytesPerRow;
+    unsigned char* destRows;
+
+    if (!accelerateRendering) {
+        destBytesPerRow = 4 * size.width();
+        destRows = reinterpret_cast<unsigned char*>(imageData.m_data) + desty * destBytesPerRow + destx * 4;
+        for (int y = 0; y < numRows; ++y) {
+            for (int x = 0; x < numColumns; x++) {
+                int basex = x * 4;
+                unsigned char alpha = srcRows[basex + 3];
+                if (multiplied == Unmultiplied && alpha != 255) {
+                    destRows[basex] = (srcRows[basex] * alpha + 254) / 255;
+                    destRows[basex + 1] = (srcRows[basex + 1] * alpha + 254) / 255;
+                    destRows[basex + 2] = (srcRows[basex + 2] * alpha + 254) / 255;
+                    destRows[basex + 3] = alpha;
+                } else
+                    reinterpret_cast<uint32_t*>(destRows + basex)[0] = reinterpret_cast<uint32_t*>(srcRows + basex)[0];
+            }
+            destRows += destBytesPerRow;
+            srcRows += srcBytesPerRow;
+        }
+    } else {
+#if USE(IOSURFACE_CANVAS_BACKING_STORE)
+        IOSurfaceRef surface = imageData.m_surface.get();
+        IOSurfaceLock(surface, 0, 0);
+        destBytesPerRow = IOSurfaceGetBytesPerRow(surface);
+        destRows = (unsigned char*)(IOSurfaceGetBaseAddress(surface)) + desty * destBytesPerRow + destx * 4;
+        
+        for (int y = 0; y < numRows; ++y) {
+            for (int x = 0; x < numColumns; x++) {
+                int basex = x * 4;
+                unsigned char alpha = srcRows[basex + 3];
+                if (multiplied == Unmultiplied && alpha != 255) {
+                    destRows[basex] = (srcRows[basex + 2] * alpha + 254) / 255;
+                    destRows[basex + 1] = (srcRows[basex + 1] * alpha + 254) / 255;
+                    destRows[basex + 2] = (srcRows[basex] * alpha + 254) / 255;
+                    destRows[basex + 3] = alpha;
+                } else {
+                    destRows[basex] = srcRows[basex + 2];
+                    destRows[basex + 1] = srcRows[basex + 1];
+                    destRows[basex + 2] = srcRows[basex];
+                    destRows[basex + 3] = alpha;
+                }
+            }
+            destRows += destBytesPerRow;
+            srcRows += srcBytesPerRow;
+        }
+        IOSurfaceUnlock(surface, 0, 0);
+#else
+        ASSERT_NOT_REACHED();
+#endif
+    }
+}
+
+void ImageBuffer::putUnmultipliedImageData(ByteArray* source, const IntSize& sourceSize, const IntRect& sourceRect, const IntPoint& destPoint)
+{
+    if (m_accelerateRendering)
+        CGContextFlush(context()->platformContext());
+    putImageData<Unmultiplied>(source, sourceSize, sourceRect, destPoint, m_data, m_size, m_accelerateRendering);
+}
+
+void ImageBuffer::putPremultipliedImageData(ByteArray* source, const IntSize& sourceSize, const IntRect& sourceRect, const IntPoint& destPoint)
+{
+    if (m_accelerateRendering)
+        CGContextFlush(context()->platformContext());
+    putImageData<Premultiplied>(source, sourceSize, sourceRect, destPoint, m_data, m_size, m_accelerateRendering);
+}
+
+static inline CFStringRef jpegUTI()
+{
+#if PLATFORM(WIN)
+    static const CFStringRef kUTTypeJPEG = CFSTR("public.jpeg");
+#endif
+    return kUTTypeJPEG;
+}
+    
+static RetainPtr<CFStringRef> utiFromMIMEType(const String& mimeType)
+{
+#if PLATFORM(MAC)
+    RetainPtr<CFStringRef> mimeTypeCFString(AdoptCF, mimeType.createCFString());
+    return RetainPtr<CFStringRef>(AdoptCF, UTTypeCreatePreferredIdentifierForTag(kUTTagClassMIMEType, mimeTypeCFString.get(), 0));
+#else
+    ASSERT(isMainThread()); // It is unclear if CFSTR is threadsafe.
+
+    // FIXME: Add Windows support for all the supported UTIs when a way to convert from MIMEType to UTI reliably is found.
+    // For now, only support PNG, JPEG, and GIF. See <rdar://problem/6095286>.
+    static const CFStringRef kUTTypePNG = CFSTR("public.png");
+    static const CFStringRef kUTTypeGIF = CFSTR("com.compuserve.gif");
+
+    if (equalIgnoringCase(mimeType, "image/png"))
+        return kUTTypePNG;
+    if (equalIgnoringCase(mimeType, "image/jpeg"))
+        return jpegUTI();
+    if (equalIgnoringCase(mimeType, "image/gif"))
+        return kUTTypeGIF;
+
+    ASSERT_NOT_REACHED();
+    return kUTTypePNG;
+#endif
+}
+
+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);
+}
+} // namespace WebCore