RenderSVGResourceGradient.cpp [plain text]
#include "config.h"
#include "RenderSVGResourceGradient.h"
#include "GradientAttributes.h"
#include "GraphicsContext.h"
#include "RenderSVGText.h"
#include "SVGRenderingContext.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(RenderSVGResourceGradient);
RenderSVGResourceGradient::RenderSVGResourceGradient(SVGGradientElement& node, RenderStyle&& style)
: RenderSVGResourceContainer(node, WTFMove(style))
{
}
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, RefPtr<ImageBuffer>& imageBuffer, RenderObject* object)
{
auto* textRootBlock = RenderSVGText::locateRenderSVGTextAncestor(*object);
ASSERT(textRootBlock);
AffineTransform absoluteTransform = SVGRenderingContext::calculateTransformationToOutermostCoordinateSystem(*textRootBlock);
FloatRect repaintRect = textRootBlock->repaintRectInLocalCoordinates();
auto maskImage = SVGRenderingContext::createImageBuffer(repaintRect, absoluteTransform, ColorSpace::SRGB, context->renderingMode());
if (!maskImage)
return false;
GraphicsContext& maskImageContext = maskImage->context();
ASSERT(maskImage);
savedContext = context;
context = &maskImageContext;
imageBuffer = WTFMove(maskImage);
return true;
}
static inline AffineTransform clipToTextMask(GraphicsContext& context, RefPtr<ImageBuffer>& imageBuffer, FloatRect& targetRect, RenderObject* object, bool boundingBoxMode, const AffineTransform& gradientTransform)
{
auto* textRootBlock = RenderSVGText::locateRenderSVGTextAncestor(*object);
ASSERT(textRootBlock);
AffineTransform absoluteTransform = SVGRenderingContext::calculateTransformationToOutermostCoordinateSystem(*textRootBlock);
targetRect = textRootBlock->repaintRectInLocalCoordinates();
SVGRenderingContext::clipToImageBuffer(context, absoluteTransform, targetRect, imageBuffer, false);
AffineTransform matrix;
if (boundingBoxMode) {
FloatRect maskBoundingBox = textRootBlock->objectBoundingBox();
matrix.translate(maskBoundingBox.location());
matrix.scale(maskBoundingBox.size());
}
matrix *= gradientTransform;
return matrix;
}
#endif
bool RenderSVGResourceGradient::applyResource(RenderElement& renderer, const RenderStyle& style, GraphicsContext*& context, OptionSet<RenderSVGResourceMode> resourceMode)
{
ASSERT(context);
ASSERT(!resourceMode.isEmpty());
if (m_shouldCollectGradientAttributes) {
gradientElement().synchronizeAllAttributes();
if (!collectGradientAttributes())
return false;
m_shouldCollectGradientAttributes = false;
}
FloatRect objectBoundingBox = renderer.objectBoundingBox();
if (gradientUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX && objectBoundingBox.isEmpty())
return false;
bool isPaintingText = resourceMode.contains(RenderSVGResourceMode::ApplyToText);
auto& gradientData = m_gradientMap.ensure(&renderer, [&]() -> GradientData {
auto gradient = buildGradient(style);
AffineTransform userspaceTransform;
if (gradientUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX && !objectBoundingBox.isEmpty()
#if USE(CG)
&& !isPaintingText
#endif
) {
userspaceTransform.translate(objectBoundingBox.location());
userspaceTransform.scale(objectBoundingBox.size());
}
userspaceTransform *= gradientTransform();
if (isPaintingText) {
AffineTransform additionalTextTransform;
if (shouldTransformOnTextPainting(renderer, additionalTextTransform))
userspaceTransform *= additionalTextTransform;
}
gradient->setGradientSpaceTransform(userspaceTransform);
return { WTFMove(gradient), userspaceTransform };
}).iterator->value;
context->save();
if (isPaintingText) {
#if USE(CG)
if (!createMaskAndSwapContextForTextGradient(context, m_savedContext, m_imageBuffer, &renderer)) {
context->restore();
return false;
}
#endif
context->setTextDrawingMode(resourceMode.contains(RenderSVGResourceMode::ApplyToFill) ? TextDrawingMode::Fill : TextDrawingMode::Stroke);
}
auto& svgStyle = style.svgStyle();
if (resourceMode.contains(RenderSVGResourceMode::ApplyToFill)) {
context->setAlpha(svgStyle.fillOpacity());
context->setFillGradient(*gradientData.gradient);
context->setFillRule(svgStyle.fillRule());
} else if (resourceMode.contains(RenderSVGResourceMode::ApplyToStroke)) {
if (svgStyle.vectorEffect() == VectorEffect::NonScalingStroke)
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, OptionSet<RenderSVGResourceMode> resourceMode, const Path* path, const RenderSVGShape* shape)
{
ASSERT(context);
ASSERT(!resourceMode.isEmpty());
if (resourceMode.contains(RenderSVGResourceMode::ApplyToText)) {
#if USE(CG)
if (m_savedContext) {
auto gradientData = m_gradientMap.find(&renderer);
if (gradientData != m_gradientMap.end()) {
auto& gradient = *gradientData->value.gradient;
context = std::exchange(m_savedContext, nullptr);
FloatRect targetRect;
gradient.setGradientSpaceTransform(clipToTextMask(*context, m_imageBuffer, targetRect, &renderer, gradientUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX, gradientTransform()));
context->setFillGradient(gradient);
context->fillRect(targetRect);
m_imageBuffer = nullptr;
}
}
#else
UNUSED_PARAM(renderer);
#endif
} else {
if (resourceMode.contains(RenderSVGResourceMode::ApplyToFill)) {
if (path)
context->fillPath(*path);
else if (shape)
shape->fillShape(*context);
}
if (resourceMode.contains(RenderSVGResourceMode::ApplyToStroke)) {
if (path)
context->strokePath(*path);
else if (shape)
shape->strokeShape(*context);
}
}
context->restore();
}
void RenderSVGResourceGradient::addStops(Gradient& gradient, const Gradient::ColorStopVector& stops, const RenderStyle& style)
{
for (auto& stop : stops)
gradient.addColorStop({ stop.offset, style.colorByApplyingColorFilter(stop.color) });
}
GradientSpreadMethod RenderSVGResourceGradient::platformSpreadMethodFromSVGType(SVGSpreadMethodType method)
{
switch (method) {
case SVGSpreadMethodUnknown:
case SVGSpreadMethodPad:
return GradientSpreadMethod::Pad;
case SVGSpreadMethodReflect:
return GradientSpreadMethod::Reflect;
case SVGSpreadMethodRepeat:
return GradientSpreadMethod::Repeat;
}
ASSERT_NOT_REACHED();
return GradientSpreadMethod::Pad;
}
}