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/*
* Copyright (C) 2023, 2024 Igalia S.L.
* Copyright (C) 2025 Samuel Weinig <sam@webkit.org>
*
* 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 "RenderStyle+GettersInlines.h"
#include "RenderView.h"
#include "SVGPaintServerHandling.h"
#include "SVGRenderSupport.h"
#include "StyleComputedStyle+InitialInlines.h"
namespace WebCore {
template<SVGPaintServerHandling::Operation op>
bool SVGPaintServerHandling::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 constexpr (op == Operation::Fill) {
if (paintServer.prepareFillOperation(m_context, renderer, style))
return true;
} else if constexpr (op == Operation::Stroke) {
if (paintServer.prepareStrokeOperation(m_context, renderer, style))
return true;
}
// Repeat the paint server request, but explicitly treating the paintServer as invalid/not-existent, 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 constexpr (op == Operation::Fill)
prepareFillOperation(renderer, style, color);
else
prepareStrokeOperation(renderer, style, color);
return true;
}
template<SVGPaintServerHandling::Operation op, SVGPaintServerHandling::URIResolving allowPaintServerURIResolving>
SVGPaintServerOrColor SVGPaintServerHandling::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)) {
if constexpr (op == Operation::Fill)
return Style::ComputedStyle::initialFill().colorDisregardingType().resolvedColor();
else
return Style::ComputedStyle::initialStroke().colorDisregardingType().resolvedColor();
}
auto& paint = [&] -> const Style::SVGPaint& {
if constexpr (op == Operation::Fill)
return style.fill();
else
return style.stroke();
}();
if (paint.isNone())
return { };
if (!paint.isColor()) {
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 (paint.isURL() || paint.isURLNone())
return { };
} else {
auto paintServerForOperation = [&] {
if constexpr (op == Operation::Fill)
return targetRenderer.svgFillPaintServerResourceFromStyle(style);
else
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 (paint.isURL() || paint.isURLNone())
return { };
}
}
// Color and SVGPaint::URLColor handling.
auto color = resolveColorFromStyle<op>(style);
if (inheritColorFromParentStyleIfNeeded<op>(targetRenderer, color))
return color;
return { };
}
inline void SVGPaintServerHandling::prepareFillOperation(const RenderLayerModelObject& renderer, const RenderStyle& style, const Color& fillColor) const
{
if (renderer.view().frameView().paintBehavior().contains(PaintBehavior::RenderingSVGClipOrMask)) {
m_context.setAlpha(1);
m_context.setFillRule(style.clipRule());
} else {
m_context.setAlpha(style.fillOpacity().value.value);
m_context.setFillRule(style.fillRule());
}
Style::ColorResolver colorResolver { style };
m_context.setFillColor(colorResolver.colorApplyingColorFilter(fillColor));
}
inline void SVGPaintServerHandling::prepareStrokeOperation(const RenderLayerModelObject& renderer, const RenderStyle& style, const Color& strokeColor) const
{
m_context.setAlpha(style.strokeOpacity().value.value);
Style::ColorResolver colorResolver { style };
m_context.setStrokeColor(colorResolver.colorApplyingColorFilter(strokeColor));
SVGRenderSupport::applyStrokeStyleToContext(m_context, style, renderer);
}
template<SVGPaintServerHandling::Operation op>
Color SVGPaintServerHandling::resolveColorFromStyle(const RenderStyle& style)
{
if constexpr (op == Operation::Fill)
return resolveColorFromStyle(style, style.fill(), style.visitedLinkFill());
else
return resolveColorFromStyle(style, style.stroke(), style.visitedLinkStroke());
}
inline Color SVGPaintServerHandling::resolveColorFromStyle(const RenderStyle& style, const Style::SVGPaint& paint, const Style::SVGPaint& visitedLinkPaint)
{
// All paint types except `none` / `url` / `url none` handle solid colors.
ASSERT(!paint.isNone());
ASSERT(!paint.isURL());
ASSERT(!paint.isURLNone());
Style::ColorResolver colorResolver { style };
auto color = colorResolver.colorResolvingCurrentColor(paint.colorDisregardingType());
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
// FIXME: This code is resolving the visit link paint color with RenderStyle::color(), rather than the more commonly used RenderStyle::visitedLinkColor(). If this is intentional, we should document that, otherwise, we should use RenderStyle::visitedLinkColor().
if (auto visitedLinkPaintColor = visitedLinkPaint.tryColor()) {
if (auto visitedColor = colorResolver.colorResolvingCurrentColor(*visitedLinkPaintColor); visitedColor.isValid())
color = visitedColor.colorWithAlpha(color.alphaAsFloat());
}
}
return color;
}
template<SVGPaintServerHandling::Operation op>
bool SVGPaintServerHandling::inheritColorFromParentStyleIfNeeded(const RenderLayerModelObject& renderer, Color& color)
{
if (color.isValid())
return true;
if (!renderer.parent())
return false;
// FIXME: If this is intentionally using the `renderer` currentColor to resolve colors from `renderer.parent()`, we should document that, otherwise, this should probably use the corresponding style's current color.
Style::ColorResolver colorResolver { renderer.style() };
auto& parentStyle = renderer.parent()->style();
if constexpr (op == Operation::Fill)
color = colorResolver.colorResolvingCurrentColor(parentStyle.fill().colorDisregardingType());
else
color = colorResolver.colorResolvingCurrentColor(parentStyle.stroke().colorDisregardingType());
return true;
}
} // namespace WebCore
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