void WidgetBackingStoreCairo::scroll(const IntRect& scrollRect, const IntSize& scrollOffset)
{
notImplemented();
IntRect targetRect(scrollRect);
targetRect.move(scrollOffset);
targetRect.shiftMaxXEdgeTo(targetRect.maxX() - scrollOffset.width());
targetRect.shiftMaxYEdgeTo(targetRect.maxY() - scrollOffset.height());
if (targetRect.isEmpty())
return;
copyRectFromOneSurfaceToAnother(m_surface.get(), m_scrollSurface.get(),
scrollOffset, targetRect);
copyRectFromOneSurfaceToAnother(m_scrollSurface.get(), m_surface.get(),
IntSize(), targetRect);
}
bool GraphicsContext3D::ImageExtractor::extractImage(bool premultiplyAlpha, bool ignoreGammaAndColorProfile)
{
if (!m_image)
return false;
// We need this to stay in scope because the native image is just a shallow copy of the data.
m_decoder = new ImageSource(premultiplyAlpha ? ImageSource::AlphaPremultiplied : ImageSource::AlphaNotPremultiplied, ignoreGammaAndColorProfile ? ImageSource::GammaAndColorProfileIgnored : ImageSource::GammaAndColorProfileApplied);
if (!m_decoder)
return false;
ImageSource& decoder = *m_decoder;
m_alphaOp = AlphaDoNothing;
if (m_image->data()) {
decoder.setData(m_image->data(), true);
if (!decoder.frameCount() || !decoder.frameIsCompleteAtIndex(0))
return false;
m_imageSurface = decoder.createFrameAtIndex(0);
} else {
m_imageSurface = m_image->nativeImageForCurrentFrame();
// 1. For texImage2D with HTMLVideoElment input, assume no PremultiplyAlpha had been applied and the alpha value is 0xFF for each pixel,
// which is true at present and may be changed in the future and needs adjustment accordingly.
// 2. For texImage2D with HTMLCanvasElement input in which Alpha is already Premultiplied in this port,
// do AlphaDoUnmultiply if UNPACK_PREMULTIPLY_ALPHA_WEBGL is set to false.
if (!premultiplyAlpha && m_imageHtmlDomSource != HtmlDomVideo)
m_alphaOp = AlphaDoUnmultiply;
// if m_imageSurface is not an image, extract a copy of the surface
if (m_imageSurface && cairo_surface_get_type(m_imageSurface.get()) != CAIRO_SURFACE_TYPE_IMAGE) {
RefPtr<cairo_surface_t> tmpSurface = adoptRef(cairo_image_surface_create(CAIRO_FORMAT_ARGB32, m_imageWidth, m_imageHeight));
copyRectFromOneSurfaceToAnother(m_imageSurface.get(), tmpSurface.get(), IntSize(), IntRect(0, 0, m_imageWidth, m_imageHeight), IntSize(), CAIRO_OPERATOR_SOURCE);
m_imageSurface = tmpSurface.release();
}
}
if (!m_imageSurface)
return false;
ASSERT(cairo_surface_get_type(m_imageSurface.get()) == CAIRO_SURFACE_TYPE_IMAGE);
IntSize imageSize = cairoSurfaceSize(m_imageSurface.get());
m_imageWidth = imageSize.width();
m_imageHeight = imageSize.height();
if (!m_imageWidth || !m_imageHeight)
return false;
if (cairo_image_surface_get_format(m_imageSurface.get()) != CAIRO_FORMAT_ARGB32)
return false;
unsigned int srcUnpackAlignment = 1;
size_t bytesPerRow = cairo_image_surface_get_stride(m_imageSurface.get());
size_t bitsPerPixel = 32;
unsigned padding = bytesPerRow - bitsPerPixel / 8 * m_imageWidth;
if (padding) {
srcUnpackAlignment = padding + 1;
while (bytesPerRow % srcUnpackAlignment)
++srcUnpackAlignment;
}
m_imagePixelData = cairo_image_surface_get_data(m_imageSurface.get());
m_imageSourceFormat = DataFormatBGRA8;
m_imageSourceUnpackAlignment = srcUnpackAlignment;
return true;
}
