ShareableBitmapCairo.cpp [plain text]
#include "config.h"
#include "ShareableBitmap.h"
#include <WebCore/BitmapImage.h>
#include <WebCore/CairoOperations.h>
#include <WebCore/CairoUtilities.h>
#include <WebCore/GraphicsContextImplCairo.h>
#include <WebCore/PlatformContextCairo.h>
#include <WebCore/NotImplemented.h>
namespace WebKit {
using namespace WebCore;
static const cairo_format_t cairoFormat = CAIRO_FORMAT_ARGB32;
Checked<unsigned, RecordOverflow> ShareableBitmap::calculateBytesPerRow(WebCore::IntSize size, const Configuration&)
{
return cairo_format_stride_for_width(cairoFormat, size.width());
}
unsigned ShareableBitmap::calculateBytesPerPixel(const Configuration&)
{
return 4;
}
static inline RefPtr<cairo_surface_t> createSurfaceFromData(void* data, const WebCore::IntSize& size)
{
const int stride = cairo_format_stride_for_width(cairoFormat, size.width());
return adoptRef(cairo_image_surface_create_for_data(static_cast<unsigned char*>(data), cairoFormat, size.width(), size.height(), stride));
}
std::unique_ptr<GraphicsContext> ShareableBitmap::createGraphicsContext()
{
RefPtr<cairo_surface_t> image = createCairoSurface();
RefPtr<cairo_t> bitmapContext = adoptRef(cairo_create(image.get()));
return makeUnique<GraphicsContext>(GraphicsContextImplCairo::createFactory(bitmapContext.get()));
}
void ShareableBitmap::paint(GraphicsContext& context, const IntPoint& dstPoint, const IntRect& srcRect)
{
paint(context, 1, dstPoint, srcRect);
}
void ShareableBitmap::paint(GraphicsContext& context, float scaleFactor, const IntPoint& dstPoint, const IntRect& srcRect)
{
RefPtr<cairo_surface_t> surface = createSurfaceFromData(data(), m_size);
cairo_surface_set_device_scale(surface.get(), scaleFactor, scaleFactor);
FloatRect destRect(dstPoint, srcRect.size());
ASSERT(context.hasPlatformContext());
auto& state = context.state();
Cairo::drawSurface(*context.platformContext(), surface.get(), destRect, srcRect, state.imageInterpolationQuality, state.alpha, Cairo::ShadowState(state));
}
RefPtr<cairo_surface_t> ShareableBitmap::createCairoSurface()
{
RefPtr<cairo_surface_t> image = createSurfaceFromData(data(), m_size);
ref(); static cairo_user_data_key_t dataKey;
cairo_surface_set_user_data(image.get(), &dataKey, this, releaseSurfaceData);
return image;
}
void ShareableBitmap::releaseSurfaceData(void* typelessBitmap)
{
static_cast<ShareableBitmap*>(typelessBitmap)->deref(); }
RefPtr<Image> ShareableBitmap::createImage()
{
RefPtr<cairo_surface_t> surface = createCairoSurface();
if (!surface)
return nullptr;
return BitmapImage::create(WTFMove(surface));
}
}