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/*
* Copyright (C) 2025 Samuel Weinig <sam@webkit.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "StyleSVGPaint.h"
#include "AnimationUtilities.h"
#include "CSSURLValue.h"
#include "ColorBlending.h"
#include "RenderStyle.h"
#include "StyleBuilderChecking.h"
#include "StyleColor.h"
#include "StyleForVisitedLink.h"
#include <wtf/text/TextStream.h>
namespace WebCore {
namespace Style {
auto CSSValueConversion<SVGPaint>::operator()(BuilderState& state, const CSSValue& value, ForVisitedLink forVisitedLink) -> SVGPaint
{
// <paint> = none | <color> | <url> [none | <color>]?
if (RefPtr list = dynamicDowncast<CSSValueList>(value)) {
RefPtr firstValue = list->item(0);
RefPtr urlValue = requiredDowncast<CSSURLValue>(state, *firstValue);
if (!urlValue) {
return {
.type = SVGPaintType::None,
.url = URL::none(),
.color = Color::currentColor()
};
}
auto url = toStyle(urlValue->url(), state);
if (list->size() == 1) {
return {
.type = SVGPaintType::URI,
.url = WTFMove(url),
};
}
RefPtr secondItem = list->item(1);
if (RefPtr primitiveValue = dynamicDowncast<const CSSPrimitiveValue>(secondItem)) {
switch (primitiveValue->valueID()) {
case CSSValueNone:
return {
.type = SVGPaintType::URINone,
.url = WTFMove(url),
};
case CSSValueCurrentcolor: {
state.style().setDisallowsFastPathInheritance();
return {
.type = SVGPaintType::URICurrentColor,
.url = WTFMove(url),
.color = Color::currentColor(),
};
}
default:
break;
}
}
return {
.type = SVGPaintType::URIRGBColor,
.url = WTFMove(url),
.color = toStyleFromCSSValue<Color>(state, *list->protectedItem(1), forVisitedLink)
};
}
if (RefPtr urlValue = dynamicDowncast<CSSURLValue>(value)) {
return {
.type = SVGPaintType::URI,
.url = toStyle(urlValue->url(), state),
};
}
if (RefPtr primitiveValue = dynamicDowncast<CSSPrimitiveValue>(value)) {
switch (primitiveValue->valueID()) {
case CSSValueNone:
return {
.type = SVGPaintType::None,
};
case CSSValueCurrentcolor: {
state.style().setDisallowsFastPathInheritance();
return {
.type = SVGPaintType::CurrentColor,
.color = Color::currentColor(),
};
}
default:
break;
}
}
return {
.type = SVGPaintType::RGBColor,
.color = toStyleFromCSSValue<Color>(state, value, forVisitedLink)
};
}
// MARK: - Blending
auto Blending<SVGPaint>::equals(const SVGPaint& a, const SVGPaint& b, const RenderStyle& aStyle, const RenderStyle& bStyle) -> bool
{
if (a.type != b.type)
return false;
// We only support animations between SVGPaints that are pure Color values.
// For everything else we must return true for this method, otherwise
// we will try to animate between values forever.
if (a.type == SVGPaintType::RGBColor)
return equalsForBlending(a.color, b.color, aStyle, bStyle);
return true;
}
auto Blending<SVGPaint>::canBlend(const SVGPaint& a, const SVGPaint& b) -> bool
{
auto isValidPaintType = [](SVGPaintType paintType) {
return paintType == SVGPaintType::RGBColor || paintType == SVGPaintType::CurrentColor;
};
if (!isValidPaintType(a.type) || !isValidPaintType(b.type))
return false;
if (a.color.isCurrentColor() && b.color.isCurrentColor())
return false;
return true;
}
auto Blending<SVGPaint>::blend(const SVGPaint& a, const SVGPaint& b, const RenderStyle& aStyle, const RenderStyle& bStyle, const BlendingContext& context) -> SVGPaint
{
return SVGPaint {
.type = a.type,
.url = URL::none(),
.color = WebCore::blend(aStyle.colorResolvingCurrentColor(a.color), bStyle.colorResolvingCurrentColor(b.color), context)
};
}
// MARK: - Logging
TextStream& operator<<(TextStream& ts, SVGPaintType paintType)
{
switch (paintType) {
case SVGPaintType::RGBColor: ts << "rgb-color"_s; break;
case SVGPaintType::None: ts << "none"_s; break;
case SVGPaintType::CurrentColor: ts << "current-color"_s; break;
case SVGPaintType::URINone: ts << "uri-none"_s; break;
case SVGPaintType::URICurrentColor: ts << "uri-current-color"_s; break;
case SVGPaintType::URIRGBColor: ts << "uri-rgb-color"_s; break;
case SVGPaintType::URI: ts << "uri"_s; break;
}
return ts;
}
} // namespace Style
} // namespace WebCore
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