| /* |
| * Copyright (C) 2007, 2008 Rob Buis <buis@kde.org> |
| * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org> |
| * Copyright (C) 2007 Eric Seidel <eric@webkit.org> |
| * Copyright (C) 2009 Google, Inc. All rights reserved. |
| * Copyright (C) 2009 Dirk Schulze <krit@webkit.org> |
| * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #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() |
| { |
| // Fast path if we don't need to restore anything. |
| 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 |
| // This function must not be called twice! |
| ASSERT(!(m_renderingFlags & PrepareToRenderSVGContentWasCalled)); |
| m_renderingFlags |= PrepareToRenderSVGContentWasCalled; |
| #endif |
| |
| m_renderer = &renderer; |
| m_paintInfo = &paintInfo; |
| m_filter = nullptr; |
| |
| // We need to save / restore the context even if the initialization failed. |
| if (needsGraphicsContextSave == SaveGraphicsContext) { |
| m_paintInfo->context().save(); |
| m_renderingFlags |= RestoreGraphicsContext; |
| } |
| |
| auto& style = m_renderer->style(); |
| |
| const SVGRenderStyle& svgStyle = style.svgStyle(); |
| |
| // Setup transparency layers before setting up SVG resources! |
| bool isRenderingMask = isRenderingMaskImage(*m_renderer); |
| // RenderLayer takes care of root opacity. |
| 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(); |
| if (is<ShapeClipPathOperation>(clipPathOperation)) { |
| auto& clipPath = downcast<ShapeClipPathOperation>(*clipPathOperation); |
| FloatRect referenceBox; |
| if (clipPath.referenceBox() == Stroke) |
| // FIXME: strokeBoundingBox() takes dasharray into account but shouldn't. |
| referenceBox = renderer.strokeBoundingBox(); |
| else if (clipPath.referenceBox() == ViewBox && renderer.element()) { |
| FloatSize viewportSize; |
| SVGLengthContext(downcast<SVGElement>(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()); |
| } |
| |
| 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 (!clipPathOperation && 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; |
| // Return with false here may mean that we don't need to draw the content |
| // (because it was either drawn before or empty) but we still need to apply the filter. |
| 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; |
| |
| // Since we're caching the resulting bitmap and do not invalidate it on repaint rect |
| // changes, we need to paint the whole filter region. Otherwise, elements not visible |
| // at the time of the initial paint (due to scrolling, window size, etc.) will never |
| // be drawn. |
| 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(); |
| // 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; |
| } |
| |
| std::unique_ptr<ImageBuffer> SVGRenderingContext::createImageBuffer(const FloatRect& targetRect, const AffineTransform& absoluteTransform, ColorSpace colorSpace, RenderingMode renderingMode) |
| { |
| IntRect paintRect = calculateImageBufferRect(targetRect, absoluteTransform); |
| // Don't create empty ImageBuffers. |
| 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()); |
| |
| // Don't create empty ImageBuffers. |
| if (clampedSize.isEmpty()) |
| return nullptr; |
| |
| auto imageBuffer = ImageBuffer::create(clampedSize, renderingMode, 1, colorSpace); |
| if (!imageBuffer) |
| return nullptr; |
| |
| GraphicsContext& imageContext = imageBuffer->context(); |
| |
| // Compensate rounding effects, as the absolute target rect is using floating-point numbers and the image buffer size is integer. |
| imageContext.scale(unclampedSize / targetRect.size()); |
| |
| return imageBuffer; |
| } |
| |
| 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, { }); |
| |
| 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().value_or(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(); |
| } |
| |
| 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(); |
| |
| // Invalidate an existing buffer if the scale is not correct. |
| 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(); |
| } |
| |
| // Create a new buffer and paint the foreground into it. |
| 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; |
| } |
| |
| } |
