C++ SVGPatternElement::synchronizeAnimatedSVGAttribute方法代码示例

SVGPaintServer LayoutSVGResourcePattern::preparePaintServer(const LayoutObject& object)
{
    clearInvalidationMask();

    SVGPatternElement* patternElement = toSVGPatternElement(element());
    if (!patternElement)
        return SVGPaintServer::invalid();

    if (m_shouldCollectPatternAttributes) {
        patternElement->synchronizeAnimatedSVGAttribute(anyQName());

#if ENABLE(OILPAN)
        m_attributesWrapper->set(PatternAttributes());
#else
        m_attributes = PatternAttributes();
#endif
        patternElement->collectPatternAttributes(mutableAttributes());
        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 (attributes().patternUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX && objectBoundingBox.isEmpty())
        return SVGPaintServer::invalid();

    PatternData* patternData = patternForLayoutObject(object);
    if (!patternData || !patternData->pattern)
        return SVGPaintServer::invalid();

    patternData->pattern->setPatternSpaceTransform(patternData->transform);

    return SVGPaintServer(patternData->pattern);
}

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();
}