| /* |
| * 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" |
| |
| #include "core/rendering/svg/RenderSVGResourcePattern.h" |
| |
| #include "core/platform/graphics/GraphicsContext.h" |
| #include "core/rendering/svg/SVGRenderSupport.h" |
| #include "core/rendering/svg/SVGRenderingContext.h" |
| #include "core/svg/PatternAttributes.h" |
| #include "core/svg/SVGFitToViewBox.h" |
| |
| namespace WebCore { |
| |
| const RenderSVGResourceType RenderSVGResourcePattern::s_resourceType = PatternResourceType; |
| |
| RenderSVGResourcePattern::RenderSVGResourcePattern(SVGPatternElement* node) |
| : RenderSVGResourceContainer(node) |
| , m_shouldCollectPatternAttributes(true) |
| { |
| } |
| |
| void RenderSVGResourcePattern::removeAllClientsFromCache(bool markForInvalidation) |
| { |
| m_patternMap.clear(); |
| m_shouldCollectPatternAttributes = true; |
| markAllClientsForInvalidation(markForInvalidation ? RepaintInvalidation : ParentOnlyInvalidation); |
| } |
| |
| void RenderSVGResourcePattern::removeClientFromCache(RenderObject* client, bool markForInvalidation) |
| { |
| ASSERT(client); |
| m_patternMap.remove(client); |
| markClientForInvalidation(client, markForInvalidation ? RepaintInvalidation : ParentOnlyInvalidation); |
| } |
| |
| PatternData* RenderSVGResourcePattern::buildPattern(RenderObject* object, unsigned short resourceMode) |
| { |
| PatternData* currentData = m_patternMap.get(object); |
| if (currentData && currentData->pattern) |
| return currentData; |
| |
| SVGPatternElement* patternElement = toSVGPatternElement(element()); |
| if (!patternElement) |
| return 0; |
| |
| if (m_shouldCollectPatternAttributes) { |
| patternElement->synchronizeAnimatedSVGAttribute(anyQName()); |
| |
| m_attributes = PatternAttributes(); |
| patternElement->collectPatternAttributes(m_attributes); |
| m_shouldCollectPatternAttributes = false; |
| } |
| |
| // If we couldn't determine the pattern content element root, stop here. |
| if (!m_attributes.patternContentElement()) |
| return 0; |
| |
| // An empty viewBox disables rendering. |
| if (m_attributes.hasViewBox() && m_attributes.viewBox().isEmpty()) |
| return 0; |
| |
| // Compute all necessary transformations to build the tile image & the pattern. |
| FloatRect tileBoundaries; |
| AffineTransform tileImageTransform; |
| if (!buildTileImageTransform(object, m_attributes, patternElement, tileBoundaries, tileImageTransform)) |
| return 0; |
| |
| AffineTransform absoluteTransformIgnoringRotation; |
| SVGRenderingContext::calculateTransformationToOutermostCoordinateSystem(object, absoluteTransformIgnoringRotation); |
| |
| // Ignore 2D rotation, as it doesn't affect the size of the tile. |
| SVGRenderingContext::clear2DRotation(absoluteTransformIgnoringRotation); |
| FloatRect absoluteTileBoundaries = absoluteTransformIgnoringRotation.mapRect(tileBoundaries); |
| FloatRect clampedAbsoluteTileBoundaries; |
| |
| // Scale the tile size to match the scale level of the patternTransform. |
| absoluteTileBoundaries.scale(static_cast<float>(m_attributes.patternTransform().xScale()), |
| static_cast<float>(m_attributes.patternTransform().yScale())); |
| |
| // Build tile image. |
| OwnPtr<ImageBuffer> tileImage = createTileImage(m_attributes, tileBoundaries, absoluteTileBoundaries, tileImageTransform, clampedAbsoluteTileBoundaries); |
| if (!tileImage) |
| return 0; |
| |
| RefPtr<Image> copiedImage = tileImage->copyImage(CopyBackingStore); |
| if (!copiedImage) |
| return 0; |
| |
| // Build pattern. |
| OwnPtr<PatternData> patternData = adoptPtr(new PatternData); |
| patternData->pattern = Pattern::create(copiedImage, true, true); |
| |
| // Compute pattern space transformation. |
| const IntSize tileImageSize = tileImage->logicalSize(); |
| patternData->transform.translate(tileBoundaries.x(), tileBoundaries.y()); |
| patternData->transform.scale(tileBoundaries.width() / tileImageSize.width(), tileBoundaries.height() / tileImageSize.height()); |
| |
| AffineTransform patternTransform = m_attributes.patternTransform(); |
| if (!patternTransform.isIdentity()) |
| patternData->transform = patternTransform * patternData->transform; |
| |
| // Account for text drawing resetting the context to non-scaled, see SVGInlineTextBox::paintTextWithShadows. |
| if (resourceMode & ApplyToTextMode) { |
| AffineTransform additionalTextTransformation; |
| if (shouldTransformOnTextPainting(object, additionalTextTransformation)) |
| patternData->transform *= additionalTextTransformation; |
| } |
| patternData->pattern->setPatternSpaceTransform(patternData->transform); |
| |
| // Various calls above may trigger invalidations in some fringe cases (ImageBuffer allocation |
| // failures in the SVG image cache for example). To avoid having our PatternData deleted by |
| // removeAllClientsFromCache(), we only make it visible in the cache at the very end. |
| return m_patternMap.set(object, patternData.release()).iterator->value.get(); |
| } |
| |
| bool RenderSVGResourcePattern::applyResource(RenderObject* object, RenderStyle* style, GraphicsContext*& context, unsigned short resourceMode) |
| { |
| ASSERT(object); |
| ASSERT(style); |
| ASSERT(context); |
| ASSERT(resourceMode != ApplyToDefaultMode); |
| |
| clearInvalidationMask(); |
| |
| // 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.patternUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX && objectBoundingBox.isEmpty()) |
| return false; |
| |
| PatternData* patternData = buildPattern(object, resourceMode); |
| if (!patternData) |
| return false; |
| |
| // 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); |
| else if (resourceMode & ApplyToStrokeMode) |
| context->setTextDrawingMode(TextModeStroke); |
| } |
| |
| return true; |
| } |
| |
| void RenderSVGResourcePattern::postApplyResource(RenderObject*, GraphicsContext*& context, unsigned short resourceMode, const Path* path, const RenderSVGShape* shape) |
| { |
| ASSERT(context); |
| ASSERT(resourceMode != ApplyToDefaultMode); |
| |
| if (resourceMode & ApplyToFillMode) { |
| if (path) |
| context->fillPath(*path); |
| else if (shape) |
| shape->fillShape(context); |
| } |
| if (resourceMode & ApplyToStrokeMode) { |
| if (path) |
| context->strokePath(*path); |
| else if (shape) |
| shape->strokeShape(context); |
| } |
| |
| context->restore(); |
| } |
| |
| static inline FloatRect calculatePatternBoundaries(const PatternAttributes& attributes, |
| const FloatRect& objectBoundingBox, |
| const SVGPatternElement* patternElement) |
| { |
| ASSERT(patternElement); |
| return SVGLengthContext::resolveRectangle(patternElement, attributes.patternUnits(), objectBoundingBox, attributes.x(), attributes.y(), attributes.width(), attributes.height()); |
| } |
| |
| 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 = SVGFitToViewBox::viewBoxToViewTransform(attributes.viewBox(), attributes.preserveAspectRatio(), patternBoundaries.width(), patternBoundaries.height()); |
| |
| // Apply viewBox/objectBoundingBox transformations. |
| if (!viewBoxCTM.isIdentity()) |
| tileImageTransform = viewBoxCTM; |
| else if (attributes.patternContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) |
| tileImageTransform.scale(objectBoundingBox.width(), objectBoundingBox.height()); |
| |
| return true; |
| } |
| |
| PassOwnPtr<ImageBuffer> RenderSVGResourcePattern::createTileImage(const PatternAttributes& attributes, |
| const FloatRect& tileBoundaries, |
| const FloatRect& absoluteTileBoundaries, |
| const AffineTransform& tileImageTransform, |
| FloatRect& clampedAbsoluteTileBoundaries) const |
| { |
| clampedAbsoluteTileBoundaries = SVGRenderingContext::clampedAbsoluteTargetRect(absoluteTileBoundaries); |
| |
| OwnPtr<ImageBuffer> tileImage = ImageBuffer::createBufferForTile(absoluteTileBoundaries.size(), clampedAbsoluteTileBoundaries.size(), Unaccelerated); |
| if (!tileImage) |
| return nullptr; |
| |
| 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(clampedAbsoluteTileBoundaries.width() / tileBoundaries.width(), |
| clampedAbsoluteTileBoundaries.height() / tileBoundaries.height())); |
| |
| // Apply tile image transformations. |
| if (!tileImageTransform.isIdentity()) |
| tileImageContext->concatCTM(tileImageTransform); |
| |
| AffineTransform contentTransformation; |
| if (attributes.patternContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) |
| contentTransformation = tileImageTransform; |
| |
| // Draw the content into the ImageBuffer. |
| for (Node* node = attributes.patternContentElement()->firstChild(); node; node = node->nextSibling()) { |
| if (!node->isSVGElement() || !node->renderer()) |
| continue; |
| if (node->renderer()->needsLayout()) |
| return nullptr; |
| SVGRenderingContext::renderSubtree(tileImage->context(), node->renderer(), contentTransformation); |
| } |
| |
| return tileImage.release(); |
| } |
| |
| } |
