blob: 4475a69f8f2c966f63c3183f32ef15485a84ac2b [file] [log] [blame]
/*
* 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, RefPtr<ImageBuffer>& imageBuffer, RenderElement& renderer)
{
auto* textRootBlock = RenderSVGText::locateRenderSVGTextAncestor(renderer);
ASSERT(textRootBlock);
AffineTransform absoluteTransform = SVGRenderingContext::calculateTransformationToOutermostCoordinateSystem(*textRootBlock);
FloatRect repaintRect = textRootBlock->repaintRectInLocalCoordinates();
auto maskImage = SVGRenderingContext::createImageBuffer(repaintRect, absoluteTransform, DestinationColorSpace::SRGB(), context->renderingMode(), renderer.hostWindow());
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, RenderElement& renderer, bool boundingBoxMode, const AffineTransform& gradientTransform)
{
auto* textRootBlock = RenderSVGText::locateRenderSVGTextAncestor(renderer);
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;
bool isPaintingText = resourceMode.contains(RenderSVGResourceMode::ApplyToText);
auto& gradientData = m_gradientMap.ensure(&renderer, [&]() -> GradientData {
auto gradient = buildGradient(style);
AffineTransform userspaceTransform;
// 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 (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) {
// 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))
userspaceTransform *= additionalTextTransform;
}
return { WTFMove(gradient), userspaceTransform };
}).iterator->value;
// 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) ? TextDrawingMode::Fill : TextDrawingMode::Stroke);
}
auto& svgStyle = style.svgStyle();
auto userspaceTransform = gradientData.userspaceTransform;
if (resourceMode.contains(RenderSVGResourceMode::ApplyToFill)) {
context->setAlpha(svgStyle.fillOpacity());
context->setFillGradient(*gradientData.gradient, userspaceTransform);
context->setFillRule(svgStyle.fillRule());
} else if (resourceMode.contains(RenderSVGResourceMode::ApplyToStroke)) {
if (svgStyle.vectorEffect() == VectorEffect::NonScalingStroke)
userspaceTransform = transformOnNonScalingStroke(&renderer, gradientData.userspaceTransform);
context->setAlpha(svgStyle.strokeOpacity());
context->setStrokeGradient(*gradientData.gradient, userspaceTransform);
SVGRenderSupport::applyStrokeStyleToContext(*context, style, renderer);
}
return true;
}
void RenderSVGResourceGradient::postApplyResource(RenderElement& renderer, GraphicsContext*& context, OptionSet<RenderSVGResourceMode> resourceMode, const Path* path, const RenderElement* shape)
{
ASSERT(context);
ASSERT(!resourceMode.isEmpty());
if (resourceMode.contains(RenderSVGResourceMode::ApplyToText)) {
#if USE(CG)
// CG requires special handling for gradient on text
if (m_savedContext) {
auto gradientData = m_gradientMap.find(&renderer);
if (gradientData != m_gradientMap.end()) {
auto& gradient = *gradientData->value.gradient;
// Restore on-screen drawing context
context = std::exchange(m_savedContext, nullptr);
FloatRect targetRect;
AffineTransform userspaceTransform = clipToTextMask(*context, m_imageBuffer, targetRect, renderer, gradientUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX, gradientTransform());
context->setFillGradient(gradient, userspaceTransform);
context->fillRect(targetRect);
m_imageBuffer = nullptr;
}
}
#else
UNUSED_PARAM(renderer);
#endif
} else
fillAndStrokePathOrShape(*context, resourceMode, path, shape);
context->restore();
}
GradientColorStops RenderSVGResourceGradient::stopsByApplyingColorFilter(const GradientColorStops& stops, const RenderStyle& style)
{
if (!style.hasAppleColorFilter())
return stops;
return stops.mapColors([&] (auto& color) { return style.colorByApplyingColorFilter(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;
}
}