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(const IntSize& size, ColorSpace imageColorSpace, RenderingMode renderingMode, DeferralMode, bool& success)
: m_data(size) // NOTE: The input here isn't important as ImageBufferDataCG's constructor just ignores it.
, m_size(size)
{
success = false; // Make early return mean failure.
bool accelerateRendering = renderingMode == Accelerated;
if (size.width() <= 0 || size.height() <= 0)
return;
Checked<int, RecordOverflow> width = size.width();
Checked<int, RecordOverflow> height = size.height();
// Prevent integer overflows
m_data.m_bytesPerRow = 4 * width;
Checked<size_t, RecordOverflow> numBytes = height * m_data.m_bytesPerRow;
if (numBytes.hasOverflowed())
return;
#if USE(IOSURFACE_CANVAS_BACKING_STORE)
if (width.unsafeGet() >= maxIOSurfaceDimension || height.unsafeGet() >= maxIOSurfaceDimension || (width * height).unsafeGet() < minIOSurfaceArea)
accelerateRendering = false;
#else
ASSERT(renderingMode == Unaccelerated);
#endif
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 (accelerateRendering) {
#if USE(IOSURFACE_CANVAS_BACKING_STORE)
m_data.m_surface = createIOSurface(size);
cgContext.adoptCF(wkIOSurfaceContextCreate(m_data.m_surface.get(), width.unsafeGet(), height.unsafeGet(), m_data.m_colorSpace));
#endif
if (!cgContext)
accelerateRendering = false; // If allocation fails, fall back to non-accelerated path.
}
if (!accelerateRendering) {
if (!tryFastCalloc(height.unsafeGet(), m_data.m_bytesPerRow.unsafeGet()).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, width.unsafeGet(), height.unsafeGet(), 8, m_data.m_bytesPerRow.unsafeGet(), 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, numBytes.unsafeGet(), releaseImageData));
}
if (!cgContext)
return;
m_context = adoptPtr(new GraphicsContext(cgContext.get()));
m_context->scale(FloatSize(1, -1));
m_context->translate(0, -height.unsafeGet());
m_context->setIsAcceleratedContext(accelerateRendering);
#if defined(BUILDING_ON_LION)
m_data.m_lastFlushTime = currentTimeMS();
#endif
success = true;
}
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;
Checked<int, RecordOverflow> width = size.width();
Checked<int, RecordOverflow> height = size.height();
// Prevent integer overflows
m_data.m_bytesPerRow = 4 * width;
Checked<size_t, RecordOverflow> dataSize = height * m_data.m_bytesPerRow;
if (dataSize.hasOverflowed())
return;
#if USE(IOSURFACE_CANVAS_BACKING_STORE)
if (width.unsafeGet() >= maxIOSurfaceDimension || height.unsafeGet() >= maxIOSurfaceDimension || (width * height).unsafeGet() < minIOSurfaceArea)
m_accelerateRendering = false;
#else
ASSERT(renderingMode == Unaccelerated);
#endif
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 USE(IOSURFACE_CANVAS_BACKING_STORE)
m_data.m_surface = createIOSurface(size);
cgContext.adoptCF(wkIOSurfaceContextCreate(m_data.m_surface.get(), width.unsafeGet(), height.unsafeGet(), m_data.m_colorSpace));
#endif
if (!cgContext)
m_accelerateRendering = false; // If allocation fails, fall back to non-accelerated path.
}
if (!m_accelerateRendering) {
if (!tryFastCalloc(height.unsafeGet(), m_data.m_bytesPerRow.unsafeGet()).getValue(m_data.m_data))
return;
ASSERT(!(reinterpret_cast<size_t>(m_data.m_data) & 2));
#if USE_ARGB32
m_data.m_bitmapInfo = kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host;
#else
m_data.m_bitmapInfo = kCGImageAlphaPremultipliedLast;
#endif
cgContext.adoptCF(CGBitmapContextCreate(m_data.m_data, width.unsafeGet(), height.unsafeGet(), 8, m_data.m_bytesPerRow.unsafeGet(), 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.unsafeGet(), releaseImageData));
}
if (!cgContext)
return;
m_context= adoptPtr(new GraphicsContext(cgContext.get()));
m_context->scale(FloatSize(1, -1));
m_context->translate(0, -height.unsafeGet());
success = true;
}