--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/rendering/RenderSVGResourceGradient.cpp Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,263 @@
+/*
+ * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
+ * 2008 Eric Seidel <eric@webkit.org>
+ * 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 "SVGRenderSupport.h"
+#include <wtf/UnusedParam.h>
+
+namespace WebCore {
+
+RenderSVGResourceGradient::RenderSVGResourceGradient(SVGGradientElement* node)
+ : RenderSVGResourceContainer(node)
+#if PLATFORM(CG)
+ , m_savedContext(0)
+#endif
+{
+}
+
+RenderSVGResourceGradient::~RenderSVGResourceGradient()
+{
+ deleteAllValues(m_gradient);
+ m_gradient.clear();
+}
+
+void RenderSVGResourceGradient::invalidateClients()
+{
+ const HashMap<RenderObject*, GradientData*>::const_iterator end = m_gradient.end();
+ for (HashMap<RenderObject*, GradientData*>::const_iterator it = m_gradient.begin(); it != end; ++it)
+ markForLayoutAndResourceInvalidation(it->first, false);
+
+ deleteAllValues(m_gradient);
+ m_gradient.clear();
+}
+
+void RenderSVGResourceGradient::invalidateClient(RenderObject* object)
+{
+ ASSERT(object);
+ if (!m_gradient.contains(object))
+ return;
+
+ delete m_gradient.take(object);
+ markForLayoutAndResourceInvalidation(object, false);
+}
+
+#if PLATFORM(CG)
+static inline AffineTransform absoluteTransformFromContext(GraphicsContext* context)
+{
+ // Extract current transformation matrix used in the original context. Note that this coordinate
+ // system is flipped compared to SVGs internal coordinate system, done in WebKit level. Fix
+ // this transformation by flipping the y component.
+ return context->getCTM() * AffineTransform().flipY();
+}
+
+static inline bool createMaskAndSwapContextForTextGradient(GraphicsContext*& context,
+ GraphicsContext*& savedContext,
+ OwnPtr<ImageBuffer>& imageBuffer,
+ const RenderObject* object)
+{
+ const RenderObject* textRootBlock = SVGRenderSupport::findTextRootObject(object);
+
+ AffineTransform transform(absoluteTransformFromContext(context));
+ FloatRect maskAbsoluteBoundingBox = transform.mapRect(textRootBlock->repaintRectInLocalCoordinates());
+
+ IntRect maskImageRect = enclosingIntRect(maskAbsoluteBoundingBox);
+ if (maskImageRect.isEmpty())
+ return false;
+
+ // Allocate an image buffer as big as the absolute unclipped size of the object
+ OwnPtr<ImageBuffer> maskImage = ImageBuffer::create(maskImageRect.size());
+ if (!maskImage)
+ return false;
+
+ GraphicsContext* maskImageContext = maskImage->context();
+
+ // Transform the mask image coordinate system to absolute screen coordinates
+ maskImageContext->translate(-maskAbsoluteBoundingBox.x(), -maskAbsoluteBoundingBox.y());
+ maskImageContext->concatCTM(transform);
+
+ imageBuffer = maskImage.release();
+ savedContext = context;
+ context = maskImageContext;
+
+ return true;
+}
+
+static inline AffineTransform clipToTextMask(GraphicsContext* context,
+ OwnPtr<ImageBuffer>& imageBuffer,
+ const RenderObject* object,
+ GradientData* gradientData)
+{
+ const RenderObject* textRootBlock = SVGRenderSupport::findTextRootObject(object);
+
+ // The mask image has been created in the device coordinate space, as the image should not be scaled.
+ // So the actual masking process has to be done in the device coordinate space as well.
+ AffineTransform transform(absoluteTransformFromContext(context));
+ context->concatCTM(transform.inverse());
+ context->clipToImageBuffer(transform.mapRect(textRootBlock->repaintRectInLocalCoordinates()), imageBuffer.get());
+ context->concatCTM(transform);
+
+ AffineTransform matrix;
+ if (gradientData->boundingBoxMode) {
+ FloatRect maskBoundingBox = textRootBlock->objectBoundingBox();
+ matrix.translate(maskBoundingBox.x(), maskBoundingBox.y());
+ matrix.scaleNonUniform(maskBoundingBox.width(), maskBoundingBox.height());
+ }
+ matrix.multLeft(gradientData->transform);
+ 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 invalidateClients() 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;
+
+ gradientElement->updateAnimatedSVGAttribute(anyQName());
+
+ 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 PLATFORM(CG)
+ if (gradientData->boundingBoxMode && !isPaintingText) {
+#else
+ if (gradientData->boundingBoxMode) {
+#endif
+ FloatRect objectBoundingBox = object->objectBoundingBox();
+ gradientData->userspaceTransform.translate(objectBoundingBox.x(), objectBoundingBox.y());
+ gradientData->userspaceTransform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
+ }
+
+ gradientData->userspaceTransform.multLeft(gradientData->transform);
+ gradientData->gradient->setGradientSpaceTransform(gradientData->userspaceTransform);
+ }
+
+ if (!gradientData->gradient)
+ return false;
+
+ // Draw gradient
+ context->save();
+
+ if (isPaintingText) {
+#if PLATFORM(CG)
+ if (!createMaskAndSwapContextForTextGradient(context, m_savedContext, m_imageBuffer, object)) {
+ context->restore();
+ return false;
+ }
+#endif
+
+ context->setTextDrawingMode(resourceMode & ApplyToFillMode ? cTextFill : cTextStroke);
+ }
+
+ 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)
+{
+ ASSERT(context);
+ ASSERT(resourceMode != ApplyToDefaultMode);
+
+ if (resourceMode & ApplyToTextMode) {
+#if PLATFORM(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;
+
+ gradientData->gradient->setGradientSpaceTransform(clipToTextMask(context, m_imageBuffer, object, gradientData));
+ context->setFillGradient(gradientData->gradient);
+
+ const RenderObject* textRootBlock = SVGRenderSupport::findTextRootObject(object);
+ context->fillRect(textRootBlock->repaintRectInLocalCoordinates());
+
+ m_imageBuffer.clear();
+ }
+#else
+ UNUSED_PARAM(object);
+#endif
+ } else {
+ if (resourceMode & ApplyToFillMode)
+ context->fillPath();
+ else if (resourceMode & ApplyToStrokeMode)
+ context->strokePath();
+ }
+
+ 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