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/*
* Copyright (C) 2023, 2024 Igalia S.L.
*
* 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.
*/
#pragma once
#include "RenderSVGResourceGradient.h"
#include "RenderView.h"
#include "SVGRenderStyle.h"
#include "SVGRenderSupport.h"
namespace WebCore {
class SVGPaintServerHandling {
WTF_MAKE_NONCOPYABLE(SVGPaintServerHandling);
public:
SVGPaintServerHandling(GraphicsContext& context)
: m_context(context)
{
}
~SVGPaintServerHandling() = default;
GraphicsContext& context() const { return m_context; }
enum class Operation : uint8_t {
Fill,
Stroke
};
template<Operation op>
bool preparePaintOperation(const RenderLayerModelObject& renderer, const RenderStyle& style) const
{
auto paintServerResult = requestPaintServer<op>(renderer, style);
if (std::holds_alternative<std::monostate>(paintServerResult))
return false;
if (std::holds_alternative<RenderSVGResourcePaintServer*>(paintServerResult)) {
auto& paintServer = *std::get<RenderSVGResourcePaintServer*>(paintServerResult);
if (op == Operation::Fill && paintServer.prepareFillOperation(m_context, renderer, style))
return true;
if (op == Operation::Stroke && paintServer.prepareStrokeOperation(m_context, renderer, style))
return true;
// Repeat the paint server request, but explicitly treating the paintServer as invalid/not-existant, to go through the fallback code path.
paintServerResult = requestPaintServer<op, URIResolving::Disabled>(renderer, style);
if (std::holds_alternative<std::monostate>(paintServerResult))
return false;
}
ASSERT(std::holds_alternative<Color>(paintServerResult));
const auto& color = std::get<Color>(paintServerResult);
if (op == Operation::Fill)
prepareFillOperation(renderer, style, color);
else
prepareStrokeOperation(renderer, style, color);
return true;
}
enum class URIResolving : uint8_t {
Enabled,
Disabled
};
template<Operation op, URIResolving allowPaintServerURIResolving = URIResolving::Enabled>
static SVGPaintServerOrColor requestPaintServer(const RenderLayerModelObject& targetRenderer, const RenderStyle& style)
{
// When rendering the mask for a RenderSVGResourceClipper, always use the initial fill paint server.
if (targetRenderer.view().frameView().paintBehavior().contains(PaintBehavior::RenderingSVGClipOrMask))
return op == Operation::Fill ? SVGRenderStyle::initialFillPaintColor().resolvedColor() : SVGRenderStyle::initialStrokePaintColor().resolvedColor();
auto paintType = op == Operation::Fill ? style.svgStyle().fillPaintType() : style.svgStyle().strokePaintType();
if (paintType == SVGPaintType::None)
return { };
if (paintType >= SVGPaintType::URINone) {
if (allowPaintServerURIResolving == URIResolving::Disabled) {
// If we found no paint server, and no fallback is desired, stop here.
// We can only get here, if we previously requested a paint server, attempted to
// prepare a fill or stroke operation, which failed. It can fail if, for example,
// the paint sever is a gradient, gradientUnits are set to 'objectBoundingBox' and
// the target is an one-dimensional object without a defined 'objectBoundingBox' (<line>).
if (paintType == SVGPaintType::URI || paintType == SVGPaintType::URINone)
return { };
} else {
auto paintServerForOperation = [&]() {
if (op == Operation::Fill)
return targetRenderer.svgFillPaintServerResourceFromStyle(style);
return targetRenderer.svgStrokePaintServerResourceFromStyle(style);
};
// Try resolving URI first.
if (auto* paintServer = paintServerForOperation())
return paintServer;
// If we found no paint server, and no fallback is desired, stop here.
if (paintType == SVGPaintType::URI || paintType == SVGPaintType::URINone)
return { };
}
}
// SVGPaintType::CurrentColor / SVGPaintType::RGBColor / SVGPaintType::URICurrentColor / SVGPaintType::URIRGBColor handling.
auto color = resolveColorFromStyle<op>(style);
if (inheritColorFromParentStyleIfNeeded<op>(targetRenderer, color))
return color;
return { };
}
private:
inline void prepareFillOperation(const RenderLayerModelObject& renderer, const RenderStyle& style, const Color& fillColor) const
{
Ref svgStyle = style.svgStyle();
if (renderer.view().frameView().paintBehavior().contains(PaintBehavior::RenderingSVGClipOrMask)) {
m_context.setAlpha(1);
m_context.setFillRule(svgStyle->clipRule());
} else {
m_context.setAlpha(svgStyle->fillOpacity());
m_context.setFillRule(svgStyle->fillRule());
}
m_context.setFillColor(style.colorByApplyingColorFilter(fillColor));
}
inline void prepareStrokeOperation(const RenderLayerModelObject& renderer, const RenderStyle& style, const Color& strokeColor) const
{
m_context.setAlpha(style.svgStyle().strokeOpacity());
m_context.setStrokeColor(style.colorByApplyingColorFilter(strokeColor));
SVGRenderSupport::applyStrokeStyleToContext(m_context, style, renderer);
}
template<Operation op>
static inline Color resolveColorFromStyle(const RenderStyle& style)
{
Ref svgStyle = style.svgStyle();
if (op == Operation::Fill)
return resolveColorFromStyle(style, svgStyle->fillPaintType(), svgStyle->fillPaintColor(), svgStyle->visitedLinkFillPaintType(), svgStyle->visitedLinkFillPaintColor());
return resolveColorFromStyle(style, svgStyle->strokePaintType(), svgStyle->strokePaintColor(), svgStyle->visitedLinkStrokePaintType(), svgStyle->visitedLinkStrokePaintColor());
}
static inline Color resolveColorFromStyle(const RenderStyle& style, SVGPaintType paintType, const Style::Color& paintColor, SVGPaintType visitedLinkPaintType, const Style::Color& visitedLinkPaintColor)
{
// All paint types except None / URI / URINone handle solid colors.
ASSERT_UNUSED(paintType, paintType != SVGPaintType::None);
ASSERT(paintType != SVGPaintType::URI);
ASSERT(paintType != SVGPaintType::URINone);
auto color = style.colorResolvingCurrentColor(paintColor);
if (style.insideLink() == InsideLink::InsideVisited) {
// FIXME: This code doesn't support the uri component of the visited link paint, https://bugs.webkit.org/show_bug.cgi?id=70006
if (visitedLinkPaintType == SVGPaintType::RGBColor) {
const auto& visitedColor = style.colorResolvingCurrentColor(visitedLinkPaintColor);
if (visitedColor.isValid())
color = visitedColor.colorWithAlpha(color.alphaAsFloat());
}
}
return color;
}
template<Operation op>
static inline bool inheritColorFromParentStyleIfNeeded(const RenderLayerModelObject& renderer, Color& color)
{
if (color.isValid())
return true;
if (!renderer.parent())
return false;
Ref parentSVGStyle = renderer.parent()->style().svgStyle();
color = renderer.style().colorResolvingCurrentColor(op == Operation::Fill ? parentSVGStyle->fillPaintColor() : parentSVGStyle->strokePaintColor());
return true;
}
private:
GraphicsContext& m_context;
};
} // namespace WebCore
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