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/*
* Copyright (C) 2006-2025 Apple Inc. All rights reserved.
* Copyright (C) 2008, 2010 Nokia Corporation and/or its subsidiary(-ies)
* Copyright (C) 2007 Alp Toker <alp@atoker.com>
* Copyright (C) 2008 Eric Seidel <eric@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,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* 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 "CanvasStyle.h"
#include "ContextDestructionObserverInlines.h"
#include "CSSParserContext.h"
#include "CSSParserMode.h"
#include "CSSPropertyNames.h"
#include "CSSPropertyParserConsumer+ColorInlines.h"
#include "CanvasGradient.h"
#include "CanvasPattern.h"
#include "ColorConversion.h"
#include "Gradient.h"
#include "GraphicsContext.h"
#include "HTMLCanvasElement.h"
#include "NodeInlines.h"
#include "StyleProperties.h"
#if ENABLE(OFFSCREEN_CANVAS)
#include "OffscreenCanvas.h"
#endif
namespace WebCore {
class CanvasStyleColorResolutionDelegate final : public CSS::PlatformColorResolutionDelegate {
public:
explicit CanvasStyleColorResolutionDelegate(Ref<HTMLCanvasElement> canvasElement)
: m_canvasElement { WTFMove(canvasElement) }
{
}
Color currentColor() const final;
const Ref<HTMLCanvasElement> m_canvasElement;
};
Color CanvasStyleColorResolutionDelegate::currentColor() const
{
if (!m_canvasElement->isConnected() || !m_canvasElement->inlineStyle())
return Color::black;
auto colorString = m_canvasElement->inlineStyle()->getPropertyValue(CSSPropertyColor);
auto color = CSSPropertyParserHelpers::parseColorRaw(colorString, m_canvasElement->cssParserContext(), m_canvasElement->document());
if (color.isValid())
return color;
return Color::black;
}
static OptionSet<CSS::ColorType> allowedColorTypes(ScriptExecutionContext* scriptExecutionContext)
{
if (scriptExecutionContext && scriptExecutionContext->isDocument())
return { CSS::ColorType::Absolute, CSS::ColorType::Current, CSS::ColorType::System };
// FIXME: All canvas types should support all color types, but currently
// system colors are not thread safe so are disabled for non-document
// based canvases.
return { CSS::ColorType::Absolute, CSS::ColorType::Current };
}
Color parseColor(const String& colorString, CanvasBase& canvasBase)
{
using namespace CSSPropertyParserHelpers;
auto cssParserContext = canvasBase.cssParserContext();
auto color = parseColorRawSimple(colorString, cssParserContext);
if (color.isValid())
return color;
if (RefPtr canvasElement = dynamicDowncast<HTMLCanvasElement>(canvasBase)) {
RefPtr scriptExecutionContext = canvasElement->scriptExecutionContext();
CanvasStyleColorResolutionDelegate delegate(canvasElement.releaseNonNull());
CSSColorParsingOptions options;
CSS::PlatformColorResolutionState state {
.delegate = &delegate
};
return parseColorRawGeneral(colorString, cssParserContext, *scriptExecutionContext, options, state);
}
RefPtr scriptExecutionContext = canvasBase.scriptExecutionContext();
CSSColorParsingOptions options {
.allowedColorTypes = allowedColorTypes(scriptExecutionContext.get())
};
CSS::PlatformColorResolutionState state {
.resolvedCurrentColor = Color::black
};
return parseColorRawGeneral(colorString, cssParserContext, *scriptExecutionContext, options, state);
}
Color parseColor(const String& colorString, ScriptExecutionContext& scriptExecutionContext)
{
// FIXME: Add constructor for CSSParserContext that takes a ScriptExecutionContext to allow preferences to be
// checked correctly.
using namespace CSSPropertyParserHelpers;
auto color = parseColorRawSimple(colorString, CSSParserContext(HTMLStandardMode));
if (color.isValid())
return color;
CSSColorParsingOptions options {
.allowedColorTypes = allowedColorTypes(&scriptExecutionContext)
};
CSS::PlatformColorResolutionState state {
.resolvedCurrentColor = Color::black
};
return parseColorRawGeneral(colorString, CSSParserContext(HTMLStandardMode), scriptExecutionContext, options, state);
}
}
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