AffineTransform SVGRenderingContext::calculateTransformationToOutermostCoordinateSystem(const RenderObject& renderer)
{
AffineTransform absoluteTransform = currentContentTransformation();
float deviceScaleFactor = renderer.document().deviceScaleFactor();
// Walk up the render tree, accumulating SVG transforms.
const RenderObject* ancestor = &renderer;
while (ancestor) {
absoluteTransform = ancestor->localToParentTransform() * absoluteTransform;
if (ancestor->isSVGRoot())
break;
ancestor = ancestor->parent();
}
// Continue walking up the layer tree, accumulating CSS transforms.
RenderLayer* layer = ancestor ? ancestor->enclosingLayer() : nullptr;
while (layer) {
if (TransformationMatrix* layerTransform = layer->transform())
absoluteTransform = layerTransform->toAffineTransform() * absoluteTransform;
// We can stop at compositing layers, to match the backing resolution.
if (layer->isComposited())
break;
layer = layer->parent();
}
absoluteTransform.scale(deviceScaleFactor);
return absoluteTransform;
}
void SVGImageBufferTools::renderSubtreeToImageBuffer(ImageBuffer* image, RenderObject* item, const AffineTransform& subtreeContentTransformation)
{
ASSERT(item);
ASSERT(image);
ASSERT(image->context());
PaintInfo info(image->context(), PaintInfo::infiniteRect(), PaintPhaseForeground, 0, 0, 0);
RenderSVGContainer* svgContainer = 0;
if (item && item->isSVGContainer() && !item->isSVGViewportContainer())
svgContainer = toRenderSVGContainer(item);
bool drawsContents = svgContainer ? svgContainer->drawsContents() : false;
if (svgContainer && !drawsContents)
svgContainer->setDrawsContents(true);
AffineTransform& contentTransformation = currentContentTransformation();
AffineTransform savedContentTransformation = contentTransformation;
contentTransformation.multiply(subtreeContentTransformation);
item->layoutIfNeeded();
item->paint(info, 0, 0);
contentTransformation = savedContentTransformation;
if (svgContainer && !drawsContents)
svgContainer->setDrawsContents(false);
}
void SVGImageBufferTools::calculateTransformationToOutermostSVGCoordinateSystem(const RenderObject* renderer, AffineTransform& absoluteTransform)
{
const RenderObject* current = renderer;
ASSERT(current);
absoluteTransform = currentContentTransformation();
while (current) {
absoluteTransform = current->localToParentTransform() * absoluteTransform;
if (current->isSVGRoot())
break;
current = current->parent();
}
}
void SVGImageBufferTools::clipToImageBuffer(GraphicsContext* context, const AffineTransform& absoluteTransform, const FloatRect& clampedAbsoluteTargetRect, OwnPtr<ImageBuffer>& imageBuffer)
{
ASSERT(context);
ASSERT(imageBuffer);
// The mask image has been created in the absolute coordinate space, as the image should not be scaled.
// So the actual masking process has to be done in the absolute coordinate space as well.
context->concatCTM(absoluteTransform.inverse());
context->clipToImageBuffer(imageBuffer.get(), clampedAbsoluteTargetRect);
context->concatCTM(absoluteTransform);
// When nesting resources, with objectBoundingBox as content unit types, there's no use in caching the
// resulting image buffer as the parent resource already caches the result.
if (!currentContentTransformation().isIdentity())
imageBuffer.clear();
}
void SVGRenderingContext::renderSubtreeToImageBuffer(ImageBuffer* image, RenderElement& item, const AffineTransform& subtreeContentTransformation)
{
ASSERT(image);
// Rendering into a buffer implies we're being used for masking, clipping, patterns or filters. In each of these
// cases we don't want to paint the selection.
PaintInfo info(image->context(), LayoutRect::infiniteRect(), PaintPhaseForeground, PaintBehaviorSkipSelectionHighlight);
AffineTransform& contentTransformation = currentContentTransformation();
AffineTransform savedContentTransformation = contentTransformation;
contentTransformation = subtreeContentTransformation * contentTransformation;
ASSERT(!item.needsLayout());
item.paint(info, IntPoint());
contentTransformation = savedContentTransformation;
}
void SVGImageBufferTools::renderSubtreeToImageBuffer(ImageBuffer* image, RenderObject* item, const AffineTransform& subtreeContentTransformation)
{
ASSERT(item);
ASSERT(image);
ASSERT(image->context());
PaintInfo info(image->context(), PaintInfo::infiniteRect(), PaintPhaseForeground, 0, 0, 0, 0);
AffineTransform& contentTransformation = currentContentTransformation();
AffineTransform savedContentTransformation = contentTransformation;
contentTransformation = subtreeContentTransformation * contentTransformation;
item->layoutIfNeeded();
item->paint(info, IntPoint());
contentTransformation = savedContentTransformation;
}
void SVGRenderingContext::clipToImageBuffer(GraphicsContext& context, const AffineTransform& absoluteTransform, const FloatRect& targetRect, std::unique_ptr<ImageBuffer>& imageBuffer, bool safeToClear)
{
if (!imageBuffer)
return;
FloatRect absoluteTargetRect = calculateImageBufferRect(targetRect, absoluteTransform);
// The mask image has been created in the absolute coordinate space, as the image should not be scaled.
// So the actual masking process has to be done in the absolute coordinate space as well.
context.concatCTM(absoluteTransform.inverse().valueOr(AffineTransform()));
context.clipToImageBuffer(*imageBuffer, absoluteTargetRect);
context.concatCTM(absoluteTransform);
// When nesting resources, with objectBoundingBox as content unit types, there's no use in caching the
// resulting image buffer as the parent resource already caches the result.
if (safeToClear && !currentContentTransformation().isIdentity())
imageBuffer.reset();
}