SVGRenderingContext.cpp [plain text]
#include "config.h"
#include "SVGRenderingContext.h"
#include "BasicShapes.h"
#include "Frame.h"
#include "FrameView.h"
#include "Page.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"
static int kMaxImageBufferSize = 4096;
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 ENABLE(FILTERS)
if (m_renderingFlags & EndFilterLayer) {
ASSERT(m_filter);
m_filter->postApplyResource(*m_renderer, m_paintInfo->context, ApplyToDefaultMode, 0, 0);
m_paintInfo->context = m_savedContext;
m_paintInfo->rect = m_savedPaintRect;
}
#endif
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;
#if ENABLE(FILTERS)
m_filter = 0;
#endif
if (needsGraphicsContextSave == SaveGraphicsContext) {
m_paintInfo->context->save();
m_renderingFlags |= RestoreGraphicsContext;
}
RenderStyle& 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() && toSVGElement(renderer.element())->isSVGGraphicsElement()) {
SVGGraphicsElement& graphicsElement = *toSVGGraphicsElement(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(), style.colorSpace());
m_paintInfo->context->beginTransparencyLayer(1);
m_renderingFlags |= EndShadowLayer;
}
}
ClipPathOperation* clipPathOperation = style.clipPath();
if (clipPathOperation && clipPathOperation->type() == ClipPathOperation::Shape) {
ShapeClipPathOperation& clipPath = toShapeClipPathOperation(*clipPathOperation);
FloatRect referenceBox;
if (clipPath.referenceBox() == Stroke)
referenceBox = renderer.strokeBoundingBox();
else if (clipPath.referenceBox() == ViewBox && renderer.element()) {
FloatSize viewportSize;
SVGLengthContext(toSVGElement(renderer.element())).determineViewport(viewportSize);
referenceBox.setWidth(viewportSize.width());
referenceBox.setHeight(viewportSize.height());
} else
referenceBox = renderer.objectBoundingBox();
m_paintInfo->context->clipPath(clipPath.pathForReferenceRect(referenceBox), clipPath.windRule());
}
SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(*m_renderer);
if (!resources) {
#if ENABLE(FILTERS)
if (svgStyle.hasFilter())
return;
#endif
m_renderingFlags |= RenderingPrepared;
return;
}
if (!isRenderingMask) {
if (RenderSVGResourceMasker* masker = resources->masker()) {
if (!masker->applyResource(*m_renderer, style, m_paintInfo->context, ApplyToDefaultMode))
return;
}
}
RenderSVGResourceClipper* clipper = resources->clipper();
if (!clipPathOperation && clipper) {
if (!clipper->applyResource(*m_renderer, style, m_paintInfo->context, ApplyToDefaultMode))
return;
}
#if ENABLE(FILTERS)
if (!isRenderingMask) {
m_filter = resources->filter();
if (m_filter) {
m_savedContext = m_paintInfo->context;
m_savedPaintRect = m_paintInfo->rect;
m_renderingFlags |= EndFilterLayer;
if (!m_filter->applyResource(*m_renderer, style, m_paintInfo->context, ApplyToDefaultMode))
return;
m_paintInfo->rect = IntRect(m_filter->drawingRegion(m_renderer));
}
}
#endif
m_renderingFlags |= RenderingPrepared;
}
static AffineTransform& currentContentTransformation()
{
DEPRECATED_DEFINE_STATIC_LOCAL(AffineTransform, s_currentContentTransformation, ());
return s_currentContentTransformation;
}
float SVGRenderingContext::calculateScreenFontSizeScalingFactor(const RenderObject& renderer)
{
AffineTransform ctm;
calculateTransformationToOutermostCoordinateSystem(renderer, ctm);
return narrowPrecisionToFloat(sqrt((pow(ctm.xScale(), 2) + pow(ctm.yScale(), 2)) / 2));
}
void SVGRenderingContext::calculateTransformationToOutermostCoordinateSystem(const RenderObject& renderer, AffineTransform& absoluteTransform)
{
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);
}
bool SVGRenderingContext::createImageBuffer(const FloatRect& targetRect, const AffineTransform& absoluteTransform, std::unique_ptr<ImageBuffer>& imageBuffer, ColorSpace colorSpace, RenderingMode renderingMode)
{
IntRect paintRect = calculateImageBufferRect(targetRect, absoluteTransform);
if (paintRect.isEmpty())
return false;
IntSize clampedSize = clampedAbsoluteSize(paintRect.size());
std::unique_ptr<ImageBuffer> image = ImageBuffer::create(clampedSize, 1, colorSpace, renderingMode);
if (!image)
return false;
GraphicsContext* imageContext = image->context();
ASSERT(imageContext);
imageContext->scale(FloatSize(static_cast<float>(clampedSize.width()) / paintRect.width(),
static_cast<float>(clampedSize.height()) / paintRect.height()));
imageContext->translate(-paintRect.x(), -paintRect.y());
imageContext->concatCTM(absoluteTransform);
imageBuffer = WTF::move(image);
return true;
}
bool SVGRenderingContext::createImageBufferForPattern(const FloatRect& absoluteTargetRect, const FloatRect& clampedAbsoluteTargetRect, std::unique_ptr<ImageBuffer>& imageBuffer, ColorSpace colorSpace, RenderingMode renderingMode)
{
IntSize imageSize(roundedIntSize(clampedAbsoluteTargetRect.size()));
IntSize unclampedImageSize(roundedIntSize(absoluteTargetRect.size()));
if (imageSize.isEmpty())
return false;
std::unique_ptr<ImageBuffer> image = ImageBuffer::create(imageSize, 1, colorSpace, renderingMode);
if (!image)
return false;
GraphicsContext* imageContext = image->context();
ASSERT(imageContext);
imageContext->scale(FloatSize(unclampedImageSize.width() / absoluteTargetRect.width(), unclampedImageSize.height() / absoluteTargetRect.height()));
imageBuffer = WTF::move(image);
return true;
}
void SVGRenderingContext::renderSubtreeToImageBuffer(ImageBuffer* image, RenderElement& item, const AffineTransform& subtreeContentTransformation)
{
ASSERT(image);
ASSERT(image->context());
PaintInfo info(image->context(), LayoutRect::infiniteRect(), PaintPhaseForeground, PaintBehaviorNormal);
AffineTransform& contentTransformation = currentContentTransformation();
AffineTransform savedContentTransformation = contentTransformation;
contentTransformation = subtreeContentTransformation * contentTransformation;
ASSERT(!item.needsLayout());
item.paint(info, IntPoint());
contentTransformation = savedContentTransformation;
}
void SVGRenderingContext::clipToImageBuffer(GraphicsContext* context, const AffineTransform& absoluteTransform, const FloatRect& targetRect, std::unique_ptr<ImageBuffer>& imageBuffer, bool safeToClear)
{
ASSERT(context);
ASSERT(imageBuffer);
FloatRect absoluteTargetRect = calculateImageBufferRect(targetRect, absoluteTransform);
context->concatCTM(absoluteTransform.inverse());
context->clipToImageBuffer(imageBuffer.get(), absoluteTargetRect);
context->concatCTM(absoluteTransform);
if (safeToClear && !currentContentTransformation().isIdentity())
imageBuffer.reset();
}
FloatRect SVGRenderingContext::clampedAbsoluteTargetRect(const FloatRect& absoluteTargetRect)
{
const FloatSize maxImageBufferSize(kMaxImageBufferSize, kMaxImageBufferSize);
return FloatRect(absoluteTargetRect.location(), absoluteTargetRect.size().shrunkTo(maxImageBufferSize));
}
IntSize SVGRenderingContext::clampedAbsoluteSize(const IntSize& absoluteSize)
{
const IntSize maxImageBufferSize(kMaxImageBufferSize, kMaxImageBufferSize);
return absoluteSize.shrunkTo(maxImageBufferSize);
}
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(m_renderer->isSVGImage());
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 = m_paintInfo->context->createCompatibleBuffer(expandedIntSize(boundingBox.size()), true))) {
GraphicsContext* bufferedRenderingContext = imageBuffer->context();
bufferedRenderingContext->translate(-boundingBox.x(), -boundingBox.y());
PaintInfo bufferedInfo(*m_paintInfo);
bufferedInfo.context = bufferedRenderingContext;
toRenderSVGImage(m_renderer)->paintForeground(bufferedInfo);
} else
return false;
}
m_paintInfo->context->drawImageBuffer(imageBuffer.get(), ColorSpaceDeviceRGB, boundingBox);
return true;
}
}