| /* |
| * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org> |
| * Copyright (C) 2008 Eric Seidel <eric@webkit.org> |
| * Copyright (C) 2008 Dirk Schulze <krit@webkit.org> |
| * Copyright (C) Research In Motion Limited 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" |
| |
| #if ENABLE(SVG) |
| #include "RenderSVGResourceGradient.h" |
| |
| #include "GradientAttributes.h" |
| #include "GraphicsContext.h" |
| #include "RenderSVGText.h" |
| #include "SVGImageBufferTools.h" |
| #include "SVGRenderSupport.h" |
| #include <wtf/UnusedParam.h> |
| |
| namespace WebCore { |
| |
| RenderSVGResourceGradient::RenderSVGResourceGradient(SVGGradientElement* node) |
| : RenderSVGResourceContainer(node) |
| , m_shouldCollectGradientAttributes(true) |
| #if USE(CG) |
| , m_savedContext(0) |
| #endif |
| { |
| } |
| |
| RenderSVGResourceGradient::~RenderSVGResourceGradient() |
| { |
| if (m_gradient.isEmpty()) |
| return; |
| |
| deleteAllValues(m_gradient); |
| m_gradient.clear(); |
| } |
| |
| void RenderSVGResourceGradient::removeAllClientsFromCache(bool markForInvalidation) |
| { |
| if (!m_gradient.isEmpty()) { |
| deleteAllValues(m_gradient); |
| m_gradient.clear(); |
| } |
| |
| m_shouldCollectGradientAttributes = true; |
| markAllClientsForInvalidation(markForInvalidation ? RepaintInvalidation : ParentOnlyInvalidation); |
| } |
| |
| void RenderSVGResourceGradient::removeClientFromCache(RenderObject* client, bool markForInvalidation) |
| { |
| ASSERT(client); |
| |
| if (m_gradient.contains(client)) |
| delete m_gradient.take(client); |
| |
| markClientForInvalidation(client, markForInvalidation ? RepaintInvalidation : ParentOnlyInvalidation); |
| } |
| |
| #if USE(CG) |
| static inline bool createMaskAndSwapContextForTextGradient(GraphicsContext*& context, |
| GraphicsContext*& savedContext, |
| OwnPtr<ImageBuffer>& imageBuffer, |
| RenderObject* object) |
| { |
| RenderObject* textRootBlock = RenderSVGText::locateRenderSVGTextAncestor(object); |
| ASSERT(textRootBlock); |
| |
| AffineTransform absoluteTransform; |
| SVGImageBufferTools::calculateTransformationToOutermostSVGCoordinateSystem(textRootBlock, absoluteTransform); |
| |
| FloatRect absoluteTargetRect = absoluteTransform.mapRect(textRootBlock->repaintRectInLocalCoordinates()); |
| FloatRect clampedAbsoluteTargetRect = SVGImageBufferTools::clampedAbsoluteTargetRectForRenderer(textRootBlock, absoluteTargetRect); |
| if (clampedAbsoluteTargetRect.isEmpty()) |
| return false; |
| |
| OwnPtr<ImageBuffer> maskImage; |
| if (!SVGImageBufferTools::createImageBuffer(absoluteTargetRect, clampedAbsoluteTargetRect, maskImage, ColorSpaceDeviceRGB)) |
| return false; |
| |
| GraphicsContext* maskImageContext = maskImage->context(); |
| ASSERT(maskImageContext); |
| |
| maskImageContext->translate(-clampedAbsoluteTargetRect.x(), -clampedAbsoluteTargetRect.y()); |
| maskImageContext->concatCTM(absoluteTransform); |
| |
| ASSERT(maskImage); |
| savedContext = context; |
| context = maskImageContext; |
| imageBuffer = maskImage.release(); |
| return true; |
| } |
| |
| static inline AffineTransform clipToTextMask(GraphicsContext* context, |
| OwnPtr<ImageBuffer>& imageBuffer, |
| FloatRect& targetRect, |
| RenderObject* object, |
| bool boundingBoxMode, |
| const AffineTransform& gradientTransform) |
| { |
| RenderObject* textRootBlock = RenderSVGText::locateRenderSVGTextAncestor(object); |
| ASSERT(textRootBlock); |
| |
| targetRect = textRootBlock->repaintRectInLocalCoordinates(); |
| |
| AffineTransform absoluteTransform; |
| SVGImageBufferTools::calculateTransformationToOutermostSVGCoordinateSystem(textRootBlock, absoluteTransform); |
| |
| FloatRect absoluteTargetRect = absoluteTransform.mapRect(targetRect); |
| FloatRect clampedAbsoluteTargetRect = SVGImageBufferTools::clampedAbsoluteTargetRectForRenderer(textRootBlock, absoluteTargetRect); |
| |
| SVGImageBufferTools::clipToImageBuffer(context, absoluteTransform, clampedAbsoluteTargetRect, imageBuffer); |
| |
| AffineTransform matrix; |
| if (boundingBoxMode) { |
| FloatRect maskBoundingBox = textRootBlock->objectBoundingBox(); |
| matrix.translate(maskBoundingBox.x(), maskBoundingBox.y()); |
| matrix.scaleNonUniform(maskBoundingBox.width(), maskBoundingBox.height()); |
| } |
| matrix *= gradientTransform; |
| return matrix; |
| } |
| #endif |
| |
| bool RenderSVGResourceGradient::applyResource(RenderObject* object, RenderStyle* style, GraphicsContext*& context, unsigned short resourceMode) |
| { |
| ASSERT(object); |
| ASSERT(style); |
| ASSERT(context); |
| ASSERT(resourceMode != ApplyToDefaultMode); |
| |
| // Be sure to synchronize all SVG properties on the gradientElement _before_ processing any further. |
| // Otherwhise the call to collectGradientAttributes() in createTileImage(), may cause the SVG DOM property |
| // synchronization to kick in, which causes removeAllClientsFromCache() to be called, which in turn deletes our |
| // GradientData object! Leaving out the line below will cause svg/dynamic-updates/SVG*GradientElement-svgdom* to crash. |
| SVGGradientElement* gradientElement = static_cast<SVGGradientElement*>(node()); |
| if (!gradientElement) |
| return false; |
| |
| if (m_shouldCollectGradientAttributes) { |
| gradientElement->updateAnimatedSVGAttribute(anyQName()); |
| collectGradientAttributes(gradientElement); |
| m_shouldCollectGradientAttributes = false; |
| } |
| |
| // Spec: When the geometry of the applicable element has no width or height and objectBoundingBox is specified, |
| // then the given effect (e.g. a gradient or a filter) will be ignored. |
| FloatRect objectBoundingBox = object->objectBoundingBox(); |
| if (boundingBoxMode() && objectBoundingBox.isEmpty()) |
| return false; |
| |
| if (!m_gradient.contains(object)) |
| m_gradient.set(object, new GradientData); |
| |
| GradientData* gradientData = m_gradient.get(object); |
| bool isPaintingText = resourceMode & ApplyToTextMode; |
| |
| // Create gradient object |
| if (!gradientData->gradient) { |
| buildGradient(gradientData, gradientElement); |
| |
| // CG platforms will handle the gradient space transform for text after applying the |
| // resource, so don't apply it here. For non-CG platforms, we want the text bounding |
| // box applied to the gradient space transform now, so the gradient shader can use it. |
| #if USE(CG) |
| if (boundingBoxMode() && !objectBoundingBox.isEmpty() && !isPaintingText) { |
| #else |
| if (boundingBoxMode() && !objectBoundingBox.isEmpty()) { |
| #endif |
| gradientData->userspaceTransform.translate(objectBoundingBox.x(), objectBoundingBox.y()); |
| gradientData->userspaceTransform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height()); |
| } |
| |
| AffineTransform gradientTransform; |
| calculateGradientTransform(gradientTransform); |
| |
| gradientData->userspaceTransform *= gradientTransform; |
| gradientData->gradient->setGradientSpaceTransform(gradientData->userspaceTransform); |
| } |
| |
| if (!gradientData->gradient) |
| return false; |
| |
| // Draw gradient |
| context->save(); |
| |
| if (isPaintingText) { |
| #if USE(CG) |
| if (!createMaskAndSwapContextForTextGradient(context, m_savedContext, m_imageBuffer, object)) { |
| context->restore(); |
| return false; |
| } |
| #endif |
| |
| context->setTextDrawingMode(resourceMode & ApplyToFillMode ? TextModeFill : TextModeStroke); |
| } |
| |
| const SVGRenderStyle* svgStyle = style->svgStyle(); |
| ASSERT(svgStyle); |
| |
| if (resourceMode & ApplyToFillMode) { |
| context->setAlpha(svgStyle->fillOpacity()); |
| context->setFillGradient(gradientData->gradient); |
| context->setFillRule(svgStyle->fillRule()); |
| } else if (resourceMode & ApplyToStrokeMode) { |
| if (svgStyle->vectorEffect() == VE_NON_SCALING_STROKE) |
| gradientData->gradient->setGradientSpaceTransform(transformOnNonScalingStroke(object, gradientData->userspaceTransform)); |
| context->setAlpha(svgStyle->strokeOpacity()); |
| context->setStrokeGradient(gradientData->gradient); |
| SVGRenderSupport::applyStrokeStyleToContext(context, style, object); |
| } |
| |
| return true; |
| } |
| |
| void RenderSVGResourceGradient::postApplyResource(RenderObject* object, GraphicsContext*& context, unsigned short resourceMode, const Path* path) |
| { |
| ASSERT(context); |
| ASSERT(resourceMode != ApplyToDefaultMode); |
| |
| if (resourceMode & ApplyToTextMode) { |
| #if USE(CG) |
| // CG requires special handling for gradient on text |
| if (m_savedContext && m_gradient.contains(object)) { |
| GradientData* gradientData = m_gradient.get(object); |
| |
| // Restore on-screen drawing context |
| context = m_savedContext; |
| m_savedContext = 0; |
| |
| AffineTransform gradientTransform; |
| calculateGradientTransform(gradientTransform); |
| |
| FloatRect targetRect; |
| gradientData->gradient->setGradientSpaceTransform(clipToTextMask(context, m_imageBuffer, targetRect, object, boundingBoxMode(), gradientTransform)); |
| context->setFillGradient(gradientData->gradient); |
| |
| context->fillRect(targetRect); |
| m_imageBuffer.clear(); |
| } |
| #else |
| UNUSED_PARAM(object); |
| #endif |
| } else if (path) { |
| if (resourceMode & ApplyToFillMode) |
| context->fillPath(*path); |
| else if (resourceMode & ApplyToStrokeMode) |
| context->strokePath(*path); |
| } |
| |
| context->restore(); |
| } |
| |
| void RenderSVGResourceGradient::addStops(GradientData* gradientData, const Vector<Gradient::ColorStop>& stops) const |
| { |
| ASSERT(gradientData->gradient); |
| |
| const Vector<Gradient::ColorStop>::const_iterator end = stops.end(); |
| for (Vector<Gradient::ColorStop>::const_iterator it = stops.begin(); it != end; ++it) |
| gradientData->gradient->addColorStop(*it); |
| } |
| |
| } |
| |
| #endif |
