void SVGImage::drawPatternForContainer(GraphicsContext* context, const FloatSize containerSize, float zoom, const FloatRect& srcRect,
const FloatSize& scale, const FloatPoint& phase, CompositeOperator compositeOp, const FloatRect& dstRect, blink::WebBlendMode blendMode, const IntSize& repeatSpacing)
{
FloatRect zoomedContainerRect = FloatRect(FloatPoint(), containerSize);
zoomedContainerRect.scale(zoom);
// The ImageBuffer size needs to be scaled to match the final resolution.
// FIXME: No need to get the full CTM here, we just need the scale.
AffineTransform transform = context->getCTM();
FloatSize imageBufferScale = FloatSize(transform.xScale(), transform.yScale());
ASSERT(imageBufferScale.width());
ASSERT(imageBufferScale.height());
FloatSize scaleWithoutCTM(scale.width() / imageBufferScale.width(), scale.height() / imageBufferScale.height());
FloatRect imageBufferSize = zoomedContainerRect;
imageBufferSize.scale(imageBufferScale.width(), imageBufferScale.height());
OwnPtr<ImageBuffer> buffer = ImageBuffer::create(expandedIntSize(imageBufferSize.size()));
if (!buffer) // Failed to allocate buffer.
return;
drawForContainer(buffer->context(), containerSize, zoom, imageBufferSize, zoomedContainerRect, CompositeSourceOver, blink::WebBlendModeNormal);
RefPtr<Image> image = buffer->copyImage(DontCopyBackingStore, Unscaled);
// Adjust the source rect and transform due to the image buffer's scaling.
FloatRect scaledSrcRect = srcRect;
scaledSrcRect.scale(imageBufferScale.width(), imageBufferScale.height());
image->drawPattern(context, scaledSrcRect, scaleWithoutCTM, phase, compositeOp, dstRect, blendMode, repeatSpacing);
}
void GeneratorGeneratedImage::drawPattern(GraphicsContext* destContext, const FloatRect& srcRect, const FloatSize& scale,
const FloatPoint& phase, CompositeOperator compositeOp, const FloatRect& destRect, BlendMode)
{
// Allow the generator to provide visually-equivalent tiling parameters for better performance.
IntSize adjustedSize = m_size;
FloatRect adjustedSrcRect = srcRect;
m_gradient->adjustParametersForTiledDrawing(adjustedSize, adjustedSrcRect);
// Factor in the destination context's scale to generate at the best resolution.
// FIXME: No need to get the full CTM here, we just need the scale.
AffineTransform destContextCTM = destContext->getCTM(GraphicsContext::DefinitelyIncludeDeviceScale);
float xScale = fabs(destContextCTM.xScale());
float yScale = fabs(destContextCTM.yScale());
FloatSize scaleWithoutCTM(scale.width() / xScale, scale.height() / yScale);
adjustedSrcRect.scale(xScale, yScale);
unsigned generatorHash = m_gradient->hash();
if (!m_cachedImageBuffer || m_cachedGeneratorHash != generatorHash || m_cachedAdjustedSize != adjustedSize || !destContext->isCompatibleWithBuffer(m_cachedImageBuffer.get())) {
m_cachedImageBuffer = destContext->createCompatibleBuffer(adjustedSize, m_gradient->hasAlpha());
if (!m_cachedImageBuffer)
return;
// Fill with the generated image.
m_cachedImageBuffer->context()->setFillGradient(m_gradient);
m_cachedImageBuffer->context()->fillRect(FloatRect(FloatPoint(), adjustedSize));
m_cachedGeneratorHash = generatorHash;
m_cachedAdjustedSize = adjustedSize;
}
// Tile the image buffer into the context.
m_cachedImageBuffer->drawPattern(destContext, adjustedSrcRect, scaleWithoutCTM, phase, compositeOp, destRect);
m_cacheTimer.restart();
}
