Merge Webkit at r58956: Initial merge by Git.

Change-Id: I1d9fb60ea2c3f2ddc04c17a871acdb39353be228

1 files changed, 265 insertions, 0 deletions

diff --git a/WebCore/rendering/RenderSVGResourceGradient.cpp b/WebCore/rendering/RenderSVGResourceGradient.cpp
new file mode 100644
index 0000000..6c9d784
--- /dev/null
+++ b/WebCore/rendering/RenderSVGResourceGradient.cpp
@@ -0,0 +1,265 @@
+/*
+ * 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);
+
+    deleteAllValues(m_gradient);
+    m_gradient.clear();
+}
+
+void RenderSVGResourceGradient::invalidateClient(RenderObject* object)
+{
+    ASSERT(object);
+
+    // FIXME: The HashMap should always contain the object on calling invalidateClient. A race condition
+    // during the parsing can causes a call of invalidateClient right before the call of applyResource.
+    // We return earlier for the moment. This bug should be fixed in:
+    // https://bugs.webkit.org/show_bug.cgi?id=35181
+    if (!m_gradient.contains(object))
+        return;
+
+    delete m_gradient.take(object);
+    markForLayoutAndResourceInvalidation(object);
+}
+
+#if PLATFORM(CG)
+static inline AffineTransform absoluteTransformForRenderer(const RenderObject* object)
+{
+    AffineTransform absoluteTransform;
+
+    const RenderObject* currentObject = object;
+    while (currentObject) {
+        absoluteTransform = currentObject->localToParentTransform() * absoluteTransform;
+        currentObject = currentObject->parent();
+    }
+
+    return absoluteTransform;
+}
+
+static inline bool createMaskAndSwapContextForTextGradient(GraphicsContext*& context,
+                                                           GraphicsContext*& savedContext,
+                                                           OwnPtr<ImageBuffer>& imageBuffer,
+                                                           const RenderObject* object)
+{
+    const RenderObject* textRootBlock = findTextRootObject(object);
+
+    AffineTransform transform = absoluteTransformForRenderer(textRootBlock);
+    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.set(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 = findTextRootObject(object);
+    context->clipToImageBuffer(textRootBlock->repaintRectInLocalCoordinates(), imageBuffer.get());
+
+    AffineTransform matrix;
+    if (gradientData->boundingBoxMode) {
+        FloatRect maskBoundingBox = textRootBlock->objectBoundingBox();
+        matrix.translate(maskBoundingBox.x(), maskBoundingBox.y());
+        matrix.scaleNonUniform(maskBoundingBox.width(), maskBoundingBox.height());
+    }
+    matrix.multiply(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);
+
+    // Create gradient object
+    if (!gradientData->gradient)
+        buildGradient(gradientData, gradientElement);
+
+    if (!gradientData->gradient)
+        return false;
+
+    // Draw gradient
+    context->save();
+
+    bool isPaintingText = resourceMode & ApplyToTextMode;
+    if (isPaintingText) {
+#if PLATFORM(CG)
+        if (!createMaskAndSwapContextForTextGradient(context, m_savedContext, m_imageBuffer, object)) {
+            context->restore();
+            return false;
+        }
+#endif
+
+        context->setTextDrawingMode(resourceMode & ApplyToFillMode ? cTextFill : cTextStroke);
+    }
+
+    AffineTransform transform;
+
+    // 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();
+        transform.translate(objectBoundingBox.x(), objectBoundingBox.y());
+        transform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
+    }
+
+    transform.multiply(gradientData->transform);
+    gradientData->gradient->setGradientSpaceTransform(transform);
+
+    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) {
+        context->setAlpha(svgStyle->strokeOpacity());
+        context->setStrokeGradient(gradientData->gradient);
+        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 = 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