RenderSVGResourceGradient.cpp [plain text]
#include "config.h"
#include "RenderSVGResourceGradient.h"
#include "GradientAttributes.h"
#include "GraphicsContext.h"
#include "RenderSVGText.h"
#include "SVGRenderingContext.h"
namespace WebCore {
RenderSVGResourceGradient::RenderSVGResourceGradient(SVGGradientElement& node, PassRef<RenderStyle> style)
: RenderSVGResourceContainer(node, WTF::move(style))
, m_shouldCollectGradientAttributes(true)
#if USE(CG)
, m_savedContext(0)
#endif
{
}
void RenderSVGResourceGradient::removeAllClientsFromCache(bool markForInvalidation)
{
m_gradientMap.clear();
m_shouldCollectGradientAttributes = true;
markAllClientsForInvalidation(markForInvalidation ? RepaintInvalidation : ParentOnlyInvalidation);
}
void RenderSVGResourceGradient::removeClientFromCache(RenderElement& client, bool markForInvalidation)
{
m_gradientMap.remove(&client);
markClientForInvalidation(client, markForInvalidation ? RepaintInvalidation : ParentOnlyInvalidation);
}
#if USE(CG)
static inline bool createMaskAndSwapContextForTextGradient(GraphicsContext*& context, GraphicsContext*& savedContext, std::unique_ptr<ImageBuffer>& imageBuffer, RenderObject* object)
{
auto* textRootBlock = RenderSVGText::locateRenderSVGTextAncestor(*object);
ASSERT(textRootBlock);
AffineTransform absoluteTransform;
SVGRenderingContext::calculateTransformationToOutermostCoordinateSystem(*textRootBlock, absoluteTransform);
FloatRect repaintRect = textRootBlock->repaintRectInLocalCoordinates();
std::unique_ptr<ImageBuffer> maskImage;
if (!SVGRenderingContext::createImageBuffer(repaintRect, absoluteTransform, maskImage, ColorSpaceDeviceRGB, Unaccelerated))
return false;
GraphicsContext* maskImageContext = maskImage->context();
ASSERT(maskImageContext);
ASSERT(maskImage);
savedContext = context;
context = maskImageContext;
imageBuffer = WTF::move(maskImage);
return true;
}
static inline AffineTransform clipToTextMask(GraphicsContext* context, std::unique_ptr<ImageBuffer>& imageBuffer, FloatRect& targetRect, RenderObject* object, bool boundingBoxMode, const AffineTransform& gradientTransform)
{
auto* textRootBlock = RenderSVGText::locateRenderSVGTextAncestor(*object);
ASSERT(textRootBlock);
AffineTransform absoluteTransform;
SVGRenderingContext::calculateTransformationToOutermostCoordinateSystem(*textRootBlock, absoluteTransform);
targetRect = textRootBlock->repaintRectInLocalCoordinates();
SVGRenderingContext::clipToImageBuffer(context, absoluteTransform, targetRect, imageBuffer, false);
AffineTransform matrix;
if (boundingBoxMode) {
FloatRect maskBoundingBox = textRootBlock->objectBoundingBox();
matrix.translate(maskBoundingBox.x(), maskBoundingBox.y());
matrix.scaleNonUniform(maskBoundingBox.width(), maskBoundingBox.height());
}
matrix *= gradientTransform;
return matrix;
}
#endif
bool RenderSVGResourceGradient::applyResource(RenderElement& renderer, const RenderStyle& style, GraphicsContext*& context, unsigned short resourceMode)
{
ASSERT(context);
ASSERT(resourceMode != ApplyToDefaultMode);
if (m_shouldCollectGradientAttributes) {
gradientElement().synchronizeAnimatedSVGAttribute(anyQName());
if (!collectGradientAttributes())
return false;
m_shouldCollectGradientAttributes = false;
}
FloatRect objectBoundingBox = renderer.objectBoundingBox();
if (gradientUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX && objectBoundingBox.isEmpty())
return false;
auto& gradientData = m_gradientMap.add(&renderer, nullptr).iterator->value;
if (!gradientData)
gradientData = std::make_unique<GradientData>();
bool isPaintingText = resourceMode & ApplyToTextMode;
if (!gradientData->gradient) {
buildGradient(gradientData.get());
#if USE(CG)
if (gradientUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX && !objectBoundingBox.isEmpty() && !isPaintingText) {
#else
if (gradientUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX && !objectBoundingBox.isEmpty()) {
#endif
gradientData->userspaceTransform.translate(objectBoundingBox.x(), objectBoundingBox.y());
gradientData->userspaceTransform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
}
AffineTransform gradientTransform;
calculateGradientTransform(gradientTransform);
gradientData->userspaceTransform *= gradientTransform;
if (isPaintingText) {
AffineTransform additionalTextTransform;
if (shouldTransformOnTextPainting(renderer, additionalTextTransform))
gradientData->userspaceTransform *= additionalTextTransform;
}
gradientData->gradient->setGradientSpaceTransform(gradientData->userspaceTransform);
}
if (!gradientData->gradient)
return false;
context->save();
if (isPaintingText) {
#if USE(CG)
if (!createMaskAndSwapContextForTextGradient(context, m_savedContext, m_imageBuffer, &renderer)) {
context->restore();
return false;
}
#endif
context->setTextDrawingMode(resourceMode & ApplyToFillMode ? TextModeFill : TextModeStroke);
}
const SVGRenderStyle& svgStyle = style.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(&renderer, gradientData->userspaceTransform));
context->setAlpha(svgStyle.strokeOpacity());
context->setStrokeGradient(gradientData->gradient);
SVGRenderSupport::applyStrokeStyleToContext(context, style, renderer);
}
return true;
}
void RenderSVGResourceGradient::postApplyResource(RenderElement& renderer, GraphicsContext*& context, unsigned short resourceMode, const Path* path, const RenderSVGShape* shape)
{
ASSERT(context);
ASSERT(resourceMode != ApplyToDefaultMode);
if (resourceMode & ApplyToTextMode) {
#if USE(CG)
GradientData* gradientData;
if (m_savedContext && (gradientData = m_gradientMap.get(&renderer))) {
context = m_savedContext;
m_savedContext = 0;
AffineTransform gradientTransform;
calculateGradientTransform(gradientTransform);
FloatRect targetRect;
gradientData->gradient->setGradientSpaceTransform(clipToTextMask(context, m_imageBuffer, targetRect, &renderer, gradientUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX, gradientTransform));
context->setFillGradient(gradientData->gradient);
context->fillRect(targetRect);
m_imageBuffer.reset();
}
#else
UNUSED_PARAM(renderer);
#endif
} else {
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();
}
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);
}
GradientSpreadMethod RenderSVGResourceGradient::platformSpreadMethodFromSVGType(SVGSpreadMethodType method) const
{
switch (method) {
case SVGSpreadMethodUnknown:
case SVGSpreadMethodPad:
return SpreadMethodPad;
case SVGSpreadMethodReflect:
return SpreadMethodReflect;
case SVGSpreadMethodRepeat:
return SpreadMethodRepeat;
}
ASSERT_NOT_REACHED();
return SpreadMethodPad;
}
}