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/*
* 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 const int maxIOSurfaceDimension = 4096;
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)
{
success = false; // Make early return mean failure.
if (size.width() < 0 || size.height() < 0)
return;
#if USE(IOSURFACE_CANVAS_BACKING_STORE)
if (size.width() >= maxIOSurfaceDimension || size.height() >= maxIOSurfaceDimension)
m_accelerateRendering = false;
#else
ASSERT(renderingMode == Unaccelerated);
#endif
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()
{
}
size_t ImageBuffer::dataSize() const
{
return m_size.height() * m_data.m_bytesPerRow;
}
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.maxX() > size.width() || rect.maxY() > size.height())
memset(data, 0, result->length());
int originx = rect.x();
int destx = 0;
if (originx < 0) {
destx = -originx;
originx = 0;
}
int endx = rect.maxX();
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.maxY();
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.maxX());
int endx = destPoint.x() + sourceRect.maxX();
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.maxY());
int endy = destPoint.y() + sourceRect.maxY();
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
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