ImageBufferCGBitmapBackend.cpp [plain text]
#include "config.h"
#include "ImageBufferCGBitmapBackend.h"
#if USE(CG)
#include "GraphicsContext.h"
#include "GraphicsContextCG.h"
#include "ImageBufferUtilitiesCG.h"
#include "ImageData.h"
#include "IntRect.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(ImageBufferCGBitmapBackend);
std::unique_ptr<ImageBufferCGBitmapBackend> ImageBufferCGBitmapBackend::create(const Parameters& parameters, CGColorSpaceRef cgColorSpace, const HostWindow*)
{
ASSERT(parameters.pixelFormat == PixelFormat::BGRA8);
IntSize backendSize = calculateBackendSize(parameters.logicalSize, parameters.resolutionScale);
if (backendSize.isEmpty())
return nullptr;
void* data;
unsigned bytesPerRow = 4 * backendSize.width();
if (!tryFastCalloc(backendSize.height(), bytesPerRow).getValue(data))
return nullptr;
ASSERT(!(reinterpret_cast<intptr_t>(data) & 3));
size_t numBytes = backendSize.height() * bytesPerRow;
verifyImageBufferIsBigEnough(data, numBytes);
auto cgContext = adoptCF(CGBitmapContextCreate(data, backendSize.width(), backendSize.height(), 8, bytesPerRow, cgColorSpace, kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));
if (!cgContext)
return nullptr;
auto context = makeUnique<GraphicsContext>(cgContext.get());
const auto releaseImageData = [] (void*, const void* data, size_t) {
fastFree(const_cast<void*>(data));
};
auto dataProvider = adoptCF(CGDataProviderCreateWithData(0, data, numBytes, releaseImageData));
return std::unique_ptr<ImageBufferCGBitmapBackend>(new ImageBufferCGBitmapBackend(parameters, data, WTFMove(dataProvider), WTFMove(context)));
}
std::unique_ptr<ImageBufferCGBitmapBackend> ImageBufferCGBitmapBackend::create(const Parameters& parameters, const GraphicsContext& context)
{
if (auto cgColorSpace = context.hasPlatformContext() ? contextColorSpace(context) : nullptr)
return ImageBufferCGBitmapBackend::create(parameters, cgColorSpace.get(), nullptr);
return ImageBufferCGBitmapBackend::create(parameters, nullptr);
}
std::unique_ptr<ImageBufferCGBitmapBackend> ImageBufferCGBitmapBackend::create(const Parameters& parameters, const HostWindow* hostWindow)
{
return ImageBufferCGBitmapBackend::create(parameters, cachedCGColorSpace(parameters.colorSpace), hostWindow);
}
ImageBufferCGBitmapBackend::ImageBufferCGBitmapBackend(const Parameters& parameters, void* data, RetainPtr<CGDataProviderRef>&& dataProvider, std::unique_ptr<GraphicsContext>&& context)
: ImageBufferCGBackend(parameters)
, m_data(data)
, m_dataProvider(WTFMove(dataProvider))
, m_context(WTFMove(context))
{
ASSERT(m_data);
ASSERT(m_dataProvider);
ASSERT(m_context);
setupContext();
}
GraphicsContext& ImageBufferCGBitmapBackend::context() const
{
return *m_context;
}
IntSize ImageBufferCGBitmapBackend::backendSize() const
{
CGContextRef cgContext = context().platformContext();
return { static_cast<int>(CGBitmapContextGetWidth(cgContext)), static_cast<int>(CGBitmapContextGetHeight(cgContext)) };
}
RefPtr<NativeImage> ImageBufferCGBitmapBackend::copyNativeImage(BackingStoreCopy copyBehavior) const
{
switch (copyBehavior) {
case CopyBackingStore:
return NativeImage::create(adoptCF(CGBitmapContextCreateImage(context().platformContext())));
case DontCopyBackingStore:
auto backendSize = this->backendSize();
return NativeImage::create(adoptCF(CGImageCreate(
backendSize.width(), backendSize.height(), 8, 32, bytesPerRow(),
cachedCGColorSpace(colorSpace()), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host, m_dataProvider.get(),
0, true, kCGRenderingIntentDefault)));
}
ASSERT_NOT_REACHED();
return nullptr;
}
Vector<uint8_t> ImageBufferCGBitmapBackend::toBGRAData() const
{
return ImageBufferBackend::toBGRAData(m_data);
}
RefPtr<ImageData> ImageBufferCGBitmapBackend::getImageData(AlphaPremultiplication outputFormat, const IntRect& srcRect) const
{
return ImageBufferBackend::getImageData(outputFormat, srcRect, m_data);
}
void ImageBufferCGBitmapBackend::putImageData(AlphaPremultiplication inputFormat, const ImageData& imageData, const IntRect& srcRect, const IntPoint& destPoint, AlphaPremultiplication destFormat)
{
ImageBufferBackend::putImageData(inputFormat, imageData, srcRect, destPoint, destFormat, m_data);
}
}
#endif // USE(CG)