SVGRenderingContext.cpp [plain text]
#include "config.h"
#include "SVGRenderingContext.h"
#include "BasicShapes.h"
#include "Frame.h"
#include "FrameView.h"
#include "RenderLayer.h"
#include "RenderSVGImage.h"
#include "RenderSVGResourceClipper.h"
#include "RenderSVGResourceFilter.h"
#include "RenderSVGResourceMasker.h"
#include "RenderView.h"
#include "SVGLengthContext.h"
#include "SVGResources.h"
#include "SVGResourcesCache.h"
namespace WebCore {
static inline bool isRenderingMaskImage(const RenderObject& object)
{
return object.view().frameView().paintBehavior() & PaintBehaviorRenderingSVGMask;
}
SVGRenderingContext::~SVGRenderingContext()
{
if (!(m_renderingFlags & ActionsNeeded))
return;
ASSERT(m_renderer && m_paintInfo);
if (m_renderingFlags & EndFilterLayer) {
ASSERT(m_filter);
GraphicsContext* contextPtr = &m_paintInfo->context();
m_filter->postApplyResource(*m_renderer, contextPtr, RenderSVGResourceMode::ApplyToDefault, nullptr, nullptr);
m_paintInfo->setContext(*m_savedContext);
m_paintInfo->rect = m_savedPaintRect;
}
if (m_renderingFlags & EndOpacityLayer)
m_paintInfo->context().endTransparencyLayer();
if (m_renderingFlags & EndShadowLayer)
m_paintInfo->context().endTransparencyLayer();
if (m_renderingFlags & RestoreGraphicsContext)
m_paintInfo->context().restore();
}
void SVGRenderingContext::prepareToRenderSVGContent(RenderElement& renderer, PaintInfo& paintInfo, NeedsGraphicsContextSave needsGraphicsContextSave)
{
#ifndef NDEBUG
ASSERT(!(m_renderingFlags & PrepareToRenderSVGContentWasCalled));
m_renderingFlags |= PrepareToRenderSVGContentWasCalled;
#endif
m_renderer = &renderer;
m_paintInfo = &paintInfo;
m_filter = nullptr;
if (needsGraphicsContextSave == SaveGraphicsContext) {
m_paintInfo->context().save();
m_renderingFlags |= RestoreGraphicsContext;
}
auto& style = m_renderer->style();
const SVGRenderStyle& svgStyle = style.svgStyle();
bool isRenderingMask = isRenderingMaskImage(*m_renderer);
float opacity = (renderer.isSVGRoot() || isRenderingMask) ? 1 : style.opacity();
const ShadowData* shadow = svgStyle.shadow();
bool hasBlendMode = style.hasBlendMode();
bool hasIsolation = style.hasIsolation();
bool isolateMaskForBlending = false;
#if ENABLE(CSS_COMPOSITING)
if (svgStyle.hasMasker() && is<SVGGraphicsElement>(downcast<SVGElement>(*renderer.element()))) {
SVGGraphicsElement& graphicsElement = downcast<SVGGraphicsElement>(*renderer.element());
isolateMaskForBlending = graphicsElement.shouldIsolateBlending();
}
#endif
if (opacity < 1 || shadow || hasBlendMode || isolateMaskForBlending || hasIsolation) {
FloatRect repaintRect = m_renderer->repaintRectInLocalCoordinates();
m_paintInfo->context().clip(repaintRect);
if (opacity < 1 || hasBlendMode || isolateMaskForBlending || hasIsolation) {
if (hasBlendMode)
m_paintInfo->context().setCompositeOperation(m_paintInfo->context().compositeOperation(), style.blendMode());
m_paintInfo->context().beginTransparencyLayer(opacity);
if (hasBlendMode)
m_paintInfo->context().setCompositeOperation(m_paintInfo->context().compositeOperation(), BlendModeNormal);
m_renderingFlags |= EndOpacityLayer;
}
if (shadow) {
m_paintInfo->context().setShadow(IntSize(roundToInt(shadow->x()), roundToInt(shadow->y())), shadow->radius(), shadow->color());
m_paintInfo->context().beginTransparencyLayer(1);
m_renderingFlags |= EndShadowLayer;
}
}
ClipPathOperation* clipPathOperation = style.clipPath();
bool hasCSSClipping = is<ShapeClipPathOperation>(clipPathOperation) || is<BoxClipPathOperation>(clipPathOperation);
if (hasCSSClipping)
SVGRenderSupport::clipContextToCSSClippingArea(m_paintInfo->context(), renderer);
auto* resources = SVGResourcesCache::cachedResourcesForRenderer(*m_renderer);
if (!resources) {
if (style.hasReferenceFilterOnly())
return;
m_renderingFlags |= RenderingPrepared;
return;
}
if (!isRenderingMask) {
if (RenderSVGResourceMasker* masker = resources->masker()) {
GraphicsContext* contextPtr = &m_paintInfo->context();
bool result = masker->applyResource(*m_renderer, style, contextPtr, RenderSVGResourceMode::ApplyToDefault);
m_paintInfo->setContext(*contextPtr);
if (!result)
return;
}
}
RenderSVGResourceClipper* clipper = resources->clipper();
if (!hasCSSClipping && clipper) {
GraphicsContext* contextPtr = &m_paintInfo->context();
bool result = clipper->applyResource(*m_renderer, style, contextPtr, RenderSVGResourceMode::ApplyToDefault);
m_paintInfo->setContext(*contextPtr);
if (!result)
return;
}
if (!isRenderingMask) {
m_filter = resources->filter();
if (m_filter) {
m_savedContext = &m_paintInfo->context();
m_savedPaintRect = m_paintInfo->rect;
m_renderingFlags |= EndFilterLayer;
GraphicsContext* contextPtr = &m_paintInfo->context();
bool result = m_filter->applyResource(*m_renderer, style, contextPtr, RenderSVGResourceMode::ApplyToDefault);
m_paintInfo->setContext(*contextPtr);
if (!result)
return;
m_paintInfo->rect = IntRect(m_filter->drawingRegion(m_renderer));
}
}
m_renderingFlags |= RenderingPrepared;
}
static AffineTransform& currentContentTransformation()
{
static NeverDestroyed<AffineTransform> s_currentContentTransformation;
return s_currentContentTransformation;
}
float SVGRenderingContext::calculateScreenFontSizeScalingFactor(const RenderObject& renderer)
{
AffineTransform ctm = calculateTransformationToOutermostCoordinateSystem(renderer);
return narrowPrecisionToFloat(sqrt((pow(ctm.xScale(), 2) + pow(ctm.yScale(), 2)) / 2));
}
AffineTransform SVGRenderingContext::calculateTransformationToOutermostCoordinateSystem(const RenderObject& renderer)
{
AffineTransform absoluteTransform = currentContentTransformation();
float deviceScaleFactor = renderer.document().deviceScaleFactor();
const RenderObject* ancestor = &renderer;
while (ancestor) {
absoluteTransform = ancestor->localToParentTransform() * absoluteTransform;
if (ancestor->isSVGRoot())
break;
ancestor = ancestor->parent();
}
RenderLayer* layer = ancestor ? ancestor->enclosingLayer() : nullptr;
while (layer) {
if (TransformationMatrix* layerTransform = layer->transform())
absoluteTransform = layerTransform->toAffineTransform() * absoluteTransform;
if (layer->isComposited())
break;
layer = layer->parent();
}
absoluteTransform.scale(deviceScaleFactor);
return absoluteTransform;
}
std::unique_ptr<ImageBuffer> SVGRenderingContext::createImageBuffer(const FloatRect& targetRect, const AffineTransform& absoluteTransform, ColorSpace colorSpace, RenderingMode renderingMode)
{
IntRect paintRect = calculateImageBufferRect(targetRect, absoluteTransform);
if (paintRect.isEmpty())
return nullptr;
FloatSize scale;
FloatSize clampedSize = ImageBuffer::clampedSize(paintRect.size(), scale);
auto imageBuffer = ImageBuffer::create(clampedSize, renderingMode, 1, colorSpace);
if (!imageBuffer)
return nullptr;
AffineTransform transform;
transform.scale(scale).translate(-paintRect.location()).multiply(absoluteTransform);
GraphicsContext& imageContext = imageBuffer->context();
imageContext.concatCTM(transform);
return imageBuffer;
}
std::unique_ptr<ImageBuffer> SVGRenderingContext::createImageBuffer(const FloatRect& targetRect, const FloatRect& clampedRect, ColorSpace colorSpace, RenderingMode renderingMode)
{
IntSize clampedSize = roundedIntSize(clampedRect.size());
FloatSize unclampedSize = roundedIntSize(targetRect.size());
if (clampedSize.isEmpty())
return nullptr;
auto imageBuffer = ImageBuffer::create(clampedSize, renderingMode, 1, colorSpace);
if (!imageBuffer)
return nullptr;
GraphicsContext& imageContext = imageBuffer->context();
imageContext.scale(unclampedSize / targetRect.size());
return imageBuffer;
}
void SVGRenderingContext::renderSubtreeToImageBuffer(ImageBuffer* image, RenderElement& item, const AffineTransform& subtreeContentTransformation)
{
ASSERT(image);
PaintInfo info(image->context(), LayoutRect::infiniteRect(), PaintPhaseForeground, PaintBehaviorSkipSelectionHighlight);
AffineTransform& contentTransformation = currentContentTransformation();
AffineTransform savedContentTransformation = contentTransformation;
contentTransformation = subtreeContentTransformation * contentTransformation;
ASSERT(!item.needsLayout());
item.paint(info, { });
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);
context.concatCTM(absoluteTransform.inverse().value_or(AffineTransform()));
context.clipToImageBuffer(*imageBuffer, absoluteTargetRect);
context.concatCTM(absoluteTransform);
if (safeToClear && !currentContentTransformation().isIdentity())
imageBuffer.reset();
}
void SVGRenderingContext::clear2DRotation(AffineTransform& transform)
{
AffineTransform::DecomposedType decomposition;
transform.decompose(decomposition);
decomposition.angle = 0;
transform.recompose(decomposition);
}
bool SVGRenderingContext::bufferForeground(std::unique_ptr<ImageBuffer>& imageBuffer)
{
ASSERT(m_paintInfo);
ASSERT(is<RenderSVGImage>(*m_renderer));
FloatRect boundingBox = m_renderer->objectBoundingBox();
if (imageBuffer) {
AffineTransform transform = m_paintInfo->context().getCTM(GraphicsContext::DefinitelyIncludeDeviceScale);
IntSize expandedBoundingBox = expandedIntSize(boundingBox.size());
IntSize bufferSize(static_cast<int>(ceil(expandedBoundingBox.width() * transform.xScale())), static_cast<int>(ceil(expandedBoundingBox.height() * transform.yScale())));
if (bufferSize != imageBuffer->internalSize())
imageBuffer.reset();
}
if (!imageBuffer) {
if ((imageBuffer = ImageBuffer::createCompatibleBuffer(expandedIntSize(boundingBox.size()), ColorSpaceSRGB, m_paintInfo->context()))) {
GraphicsContext& bufferedRenderingContext = imageBuffer->context();
bufferedRenderingContext.translate(-boundingBox.location());
PaintInfo bufferedInfo(*m_paintInfo);
bufferedInfo.setContext(bufferedRenderingContext);
downcast<RenderSVGImage>(*m_renderer).paintForeground(bufferedInfo);
} else
return false;
}
m_paintInfo->context().drawImageBuffer(*imageBuffer, boundingBox);
return true;
}
}