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/*
* Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2008 Eric Seidel <eric@webkit.org>
* Copyright (C) 2008 Dirk Schulze <krit@webkit.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 "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, std::unique_ptr<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, 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);
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());
// Be sure to synchronize all SVG properties on the gradientElement _before_ processing any further.
// Otherwhise the call to collectGradientAttributes() in createTileImage(), may cause the SVG DOM property
// synchronization to kick in, which causes removeAllClientsFromCache() to be called, which in turn deletes our
// GradientData object! Leaving out the line below will cause svg/dynamic-updates/SVG*GradientElement-svgdom* to crash.
if (m_shouldCollectGradientAttributes) {
gradientElement().synchronizeAllAttributes();
if (!collectGradientAttributes())
return false;
m_shouldCollectGradientAttributes = 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 = 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 = makeUnique<GradientData>();
bool isPaintingText = resourceMode.contains(RenderSVGResourceMode::ApplyToText);
// Create gradient object
if (!gradientData->gradient) {
buildGradient(gradientData.get(), style);
// CG platforms will handle the gradient space transform for text after applying the
// resource, so don't apply it here. For non-CG platforms, we want the text bounding
// box applied to the gradient space transform now, so the gradient shader can use it.
#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.location());
gradientData->userspaceTransform.scale(objectBoundingBox.size());
}
AffineTransform gradientTransform;
calculateGradientTransform(gradientTransform);
gradientData->userspaceTransform *= gradientTransform;
if (isPaintingText) {
// Depending on font scaling factor, we may need to rescale the gradient here since
// text painting removes the scale factor from the context.
AffineTransform additionalTextTransform;
if (shouldTransformOnTextPainting(renderer, additionalTextTransform))
gradientData->userspaceTransform *= additionalTextTransform;
}
gradientData->gradient->setGradientSpaceTransform(gradientData->userspaceTransform);
}
if (!gradientData->gradient)
return false;
// Draw gradient
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) ? TextModeFill : TextModeStroke);
}
const SVGRenderStyle& 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)
// CG requires special handling for gradient on text
GradientData* gradientData = nullptr;
if (m_savedContext && (gradientData = m_gradientMap.get(&renderer))) {
// Restore on-screen drawing context
context = m_savedContext;
m_savedContext = nullptr;
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.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(GradientData* gradientData, const Vector<Gradient::ColorStop>& stops, const RenderStyle& style) const
{
ASSERT(gradientData->gradient);
for (Gradient::ColorStop stop : stops) {
stop.color = style.colorByApplyingColorFilter(stop.color);
gradientData->gradient->addColorStop(stop);
}
}
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;
}
}