1 files changed, 293 insertions, 0 deletions
diff --git a/Source/WebCore/rendering/RenderSVGResourcePattern.cpp b/Source/WebCore/rendering/RenderSVGResourcePattern.cpp
new file mode 100644
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--- /dev/null
+++ b/Source/WebCore/rendering/RenderSVGResourcePattern.cpp
@@ -0,0 +1,293 @@
+/*
+ * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.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 "RenderSVGResourcePattern.h"
+
+#include "FrameView.h"
+#include "GraphicsContext.h"
+#include "PatternAttributes.h"
+#include "RenderSVGRoot.h"
+#include "SVGImageBufferTools.h"
+#include "SVGRenderSupport.h"
+
+namespace WebCore {
+
+RenderSVGResourceType RenderSVGResourcePattern::s_resourceType = PatternResourceType;
+
+RenderSVGResourcePattern::RenderSVGResourcePattern(SVGPatternElement* node)
+    : RenderSVGResourceContainer(node)
+    , m_shouldCollectPatternAttributes(true)
+{
+}
+
+RenderSVGResourcePattern::~RenderSVGResourcePattern()
+{
+    if (m_pattern.isEmpty())
+        return;
+
+    deleteAllValues(m_pattern);
+    m_pattern.clear();
+}
+
+void RenderSVGResourcePattern::removeAllClientsFromCache(bool markForInvalidation)
+{
+    if (!m_pattern.isEmpty()) {
+        deleteAllValues(m_pattern);
+        m_pattern.clear();
+    }
+
+    m_shouldCollectPatternAttributes = true;
+    markAllClientsForInvalidation(markForInvalidation ? RepaintInvalidation : ParentOnlyInvalidation);
+}
+
+void RenderSVGResourcePattern::removeClientFromCache(RenderObject* client, bool markForInvalidation)
+{
+    ASSERT(client);
+
+    if (m_pattern.contains(client))
+        delete m_pattern.take(client);
+
+    markClientForInvalidation(client, markForInvalidation ? RepaintInvalidation : ParentOnlyInvalidation);
+}
+
+bool RenderSVGResourcePattern::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 patternElement _before_ processing any further.
+    // Otherwhise the call to collectPatternAttributes() below, may cause the SVG DOM property
+    // synchronization to kick in, which causes removeAllClientsFromCache() to be called, which in turn deletes our
+    // PatternData object! Leaving out the line below will cause svg/dynamic-updates/SVGPatternElement-svgdom* to crash.
+    SVGPatternElement* patternElement = static_cast<SVGPatternElement*>(node());
+    if (!patternElement)
+        return false;
+
+    if (m_shouldCollectPatternAttributes) {
+        patternElement->updateAnimatedSVGAttribute(anyQName());
+
+        m_attributes = PatternAttributes();
+        patternElement->collectPatternAttributes(m_attributes);
+        m_shouldCollectPatternAttributes = 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 (m_attributes.boundingBoxMode() && objectBoundingBox.isEmpty())
+        return false;
+
+    if (!m_pattern.contains(object))
+        m_pattern.set(object, new PatternData);
+
+    PatternData* patternData = m_pattern.get(object);
+    if (!patternData->pattern) {
+        // If we couldn't determine the pattern content element root, stop here.
+        if (!m_attributes.patternContentElement())
+            return false;
+
+        // Compute all necessary transformations to build the tile image & the pattern.
+        FloatRect tileBoundaries;
+        AffineTransform tileImageTransform;
+        if (!buildTileImageTransform(object, m_attributes, patternElement, tileBoundaries, tileImageTransform))
+            return false;
+
+        AffineTransform absoluteTransform;
+        SVGImageBufferTools::calculateTransformationToOutermostSVGCoordinateSystem(object, absoluteTransform);
+
+        FloatRect absoluteTileBoundaries = absoluteTransform.mapRect(tileBoundaries);
+
+        // Build tile image.
+        OwnPtr<ImageBuffer> tileImage = createTileImage(object, m_attributes, tileBoundaries, absoluteTileBoundaries, tileImageTransform);
+        if (!tileImage)
+            return false;
+
+        RefPtr<Image> copiedImage = tileImage->copyImage();
+        if (!copiedImage)
+            return false;
+
+        // Build pattern.
+        patternData->pattern = Pattern::create(copiedImage, true, true);
+        if (!patternData->pattern)
+            return false;
+
+        // Compute pattern space transformation.
+        patternData->transform.translate(tileBoundaries.x(), tileBoundaries.y());
+        patternData->transform.scale(tileBoundaries.width() / absoluteTileBoundaries.width(), tileBoundaries.height() / absoluteTileBoundaries.height());
+
+        AffineTransform patternTransform = m_attributes.patternTransform();
+        if (!patternTransform.isIdentity())
+            patternData->transform.multiply(patternTransform);
+
+        patternData->pattern->setPatternSpaceTransform(patternData->transform);
+    }
+
+    // Draw pattern
+    context->save();
+
+    const SVGRenderStyle* svgStyle = style->svgStyle();
+    ASSERT(svgStyle);
+
+    if (resourceMode & ApplyToFillMode) {
+        context->setAlpha(svgStyle->fillOpacity());
+        context->setFillPattern(patternData->pattern);
+        context->setFillRule(svgStyle->fillRule());
+    } else if (resourceMode & ApplyToStrokeMode) {
+        if (svgStyle->vectorEffect() == VE_NON_SCALING_STROKE)
+            patternData->pattern->setPatternSpaceTransform(transformOnNonScalingStroke(object, patternData->transform));
+        context->setAlpha(svgStyle->strokeOpacity());
+        context->setStrokePattern(patternData->pattern);
+        SVGRenderSupport::applyStrokeStyleToContext(context, style, object);
+    }
+
+    if (resourceMode & ApplyToTextMode) {
+        if (resourceMode & ApplyToFillMode) {
+            context->setTextDrawingMode(TextModeFill);
+
+#if PLATFORM(CG)
+            context->applyFillPattern();
+#endif
+        } else if (resourceMode & ApplyToStrokeMode) {
+            context->setTextDrawingMode(TextModeStroke);
+
+#if PLATFORM(CG)
+            context->applyStrokePattern();
+#endif
+        }
+    }
+
+    return true;
+}
+
+void RenderSVGResourcePattern::postApplyResource(RenderObject*, GraphicsContext*& context, unsigned short resourceMode, const Path* path)
+{
+    ASSERT(context);
+    ASSERT(resourceMode != ApplyToDefaultMode);
+
+    if (path && !(resourceMode & ApplyToTextMode)) {
+        if (resourceMode & ApplyToFillMode)
+            context->fillPath(*path);
+        else if (resourceMode & ApplyToStrokeMode)
+            context->strokePath(*path);
+    }
+
+    context->restore();
+}
+
+static inline FloatRect calculatePatternBoundaries(const PatternAttributes& attributes,
+                                                   const FloatRect& objectBoundingBox,
+                                                   const SVGPatternElement* patternElement)
+{
+    ASSERT(patternElement);
+
+    if (attributes.boundingBoxMode())
+        return FloatRect(attributes.x().valueAsPercentage() * objectBoundingBox.width() + objectBoundingBox.x(),
+                         attributes.y().valueAsPercentage() * objectBoundingBox.height() + objectBoundingBox.y(),
+                         attributes.width().valueAsPercentage() * objectBoundingBox.width(),
+                         attributes.height().valueAsPercentage() * objectBoundingBox.height());
+
+    return FloatRect(attributes.x().value(patternElement),
+                     attributes.y().value(patternElement),
+                     attributes.width().value(patternElement),
+                     attributes.height().value(patternElement));
+}
+
+bool RenderSVGResourcePattern::buildTileImageTransform(RenderObject* renderer,
+                                                       const PatternAttributes& attributes,
+                                                       const SVGPatternElement* patternElement,
+                                                       FloatRect& patternBoundaries,
+                                                       AffineTransform& tileImageTransform) const
+{
+    ASSERT(renderer);
+    ASSERT(patternElement);
+
+    FloatRect objectBoundingBox = renderer->objectBoundingBox();
+    patternBoundaries = calculatePatternBoundaries(attributes, objectBoundingBox, patternElement); 
+    if (patternBoundaries.width() <= 0 || patternBoundaries.height() <= 0)
+        return false;
+
+    AffineTransform viewBoxCTM = patternElement->viewBoxToViewTransform(patternElement->viewBox(), patternElement->preserveAspectRatio(), patternBoundaries.width(), patternBoundaries.height());
+
+    // Apply viewBox/objectBoundingBox transformations.
+    if (!viewBoxCTM.isIdentity())
+        tileImageTransform = viewBoxCTM;
+    else if (attributes.boundingBoxModeContent()) {
+        tileImageTransform.translate(objectBoundingBox.x(), objectBoundingBox.y());
+        tileImageTransform.scale(objectBoundingBox.width(), objectBoundingBox.height());
+    }
+
+    return true;
+}
+
+PassOwnPtr<ImageBuffer> RenderSVGResourcePattern::createTileImage(RenderObject* object,
+                                                                  const PatternAttributes& attributes,
+                                                                  const FloatRect& tileBoundaries,
+                                                                  const FloatRect& absoluteTileBoundaries,
+                                                                  const AffineTransform& tileImageTransform) const
+{
+    ASSERT(object);
+
+    // Clamp tile image size against SVG viewport size, as last resort, to avoid allocating huge image buffers.
+    FloatRect contentBoxRect = SVGRenderSupport::findTreeRootObject(object)->contentBoxRect();
+
+    FloatRect clampedAbsoluteTileBoundaries = absoluteTileBoundaries;
+    if (clampedAbsoluteTileBoundaries.width() > contentBoxRect.width())
+        clampedAbsoluteTileBoundaries.setWidth(contentBoxRect.width());
+
+    if (clampedAbsoluteTileBoundaries.height() > contentBoxRect.height())
+        clampedAbsoluteTileBoundaries.setHeight(contentBoxRect.height());
+
+    OwnPtr<ImageBuffer> tileImage;
+
+    if (!SVGImageBufferTools::createImageBuffer(absoluteTileBoundaries, clampedAbsoluteTileBoundaries, tileImage, ColorSpaceDeviceRGB))
+        return PassOwnPtr<ImageBuffer>();
+
+    GraphicsContext* tileImageContext = tileImage->context();
+    ASSERT(tileImageContext);
+
+    // The image buffer represents the final rendered size, so the content has to be scaled (to avoid pixelation).
+    tileImageContext->scale(FloatSize(absoluteTileBoundaries.width() / tileBoundaries.width(),
+                                      absoluteTileBoundaries.height() / tileBoundaries.height()));
+
+    // Apply tile image transformations.
+    if (!tileImageTransform.isIdentity())
+        tileImageContext->concatCTM(tileImageTransform);
+
+    AffineTransform contentTransformation;
+
+    // Draw the content into the ImageBuffer.
+    for (Node* node = attributes.patternContentElement()->firstChild(); node; node = node->nextSibling()) {
+        if (!node->isSVGElement() || !static_cast<SVGElement*>(node)->isStyled() || !node->renderer())
+            continue;
+        SVGImageBufferTools::renderSubtreeToImageBuffer(tileImage.get(), node->renderer(), contentTransformation);
+    }
+
+    return tileImage.release();
+}
+
+}
+
+#endif