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/*
* Copyright (C) 2006-2017 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 "CSSParser.h"
#include "CSSPropertyNames.h"
#include "CanvasGradient.h"
#include "CanvasPattern.h"
#include "ColorConversion.h"
#include "Gradient.h"
#include "GraphicsContext.h"
#include "HTMLCanvasElement.h"
#include "StyleProperties.h"
#if ENABLE(OFFSCREEN_CANVAS)
#include "CSSPropertyParserWorkerSafe.h"
#include "OffscreenCanvas.h"
#endif
namespace WebCore {
bool isCurrentColorString(const String& colorString)
{
return equalLettersIgnoringASCIICase(colorString, "currentcolor"_s);
}
Color parseColor(const String& colorString, CanvasBase& canvasBase)
{
#if ENABLE(OFFSCREEN_CANVAS)
if (is<OffscreenCanvas>(canvasBase))
return CSSPropertyParserWorkerSafe::parseColor(colorString);
#endif
Color color;
if (is<HTMLCanvasElement>(canvasBase))
color = CSSParser::parseColor(colorString, downcast<HTMLCanvasElement>(canvasBase).cssParserContext());
else
color = CSSParser::parseColorWithoutContext(colorString);
if (color.isValid())
return color;
return CSSParser::parseSystemColor(colorString);
}
Color parseColor(const String& colorString)
{
Color color = CSSParser::parseColorWithoutContext(colorString);
if (color.isValid())
return color;
return CSSParser::parseSystemColor(colorString);
}
Color currentColor(CanvasBase& canvasBase)
{
if (!is<HTMLCanvasElement>(canvasBase))
return Color::black;
auto& canvas = downcast<HTMLCanvasElement>(canvasBase);
if (!canvas.isConnected() || !canvas.inlineStyle())
return Color::black;
Color color = CSSParser::parseColorWithoutContext(canvas.inlineStyle()->getPropertyValue(CSSPropertyColor));
if (!color.isValid())
return Color::black;
return color;
}
Color parseColorOrCurrentColor(const String& colorString, CanvasBase& canvasBase)
{
if (isCurrentColorString(colorString))
return currentColor(canvasBase);
return parseColor(colorString, canvasBase);
}
CanvasStyle::CanvasStyle(Color color)
: m_style(color)
{
}
CanvasStyle::CanvasStyle(const SRGBA<float>& colorComponents)
: m_style(convertColor<SRGBA<uint8_t>>(colorComponents))
{
}
CanvasStyle::CanvasStyle(CanvasGradient& gradient)
: m_style(&gradient)
{
}
CanvasStyle::CanvasStyle(CanvasPattern& pattern)
: m_style(&pattern)
{
}
inline CanvasStyle::CanvasStyle(CurrentColor color)
: m_style(color)
{
}
CanvasStyle CanvasStyle::createFromString(const String& colorString, CanvasBase& canvasBase)
{
if (isCurrentColorString(colorString))
return CurrentColor { std::nullopt };
Color color = parseColor(colorString, canvasBase);
if (!color.isValid())
return { };
return color;
}
CanvasStyle CanvasStyle::createFromStringWithOverrideAlpha(const String& colorString, float alpha, CanvasBase& canvasBase)
{
if (isCurrentColorString(colorString))
return CurrentColor { alpha };
Color color = parseColor(colorString, canvasBase);
if (!color.isValid())
return { };
return color.colorWithAlpha(alpha);
}
bool CanvasStyle::isEquivalentColor(const CanvasStyle& other) const
{
if (std::holds_alternative<Color>(m_style) && std::holds_alternative<Color>(other.m_style))
return std::get<Color>(m_style) == std::get<Color>(other.m_style);
return false;
}
bool CanvasStyle::isEquivalent(const SRGBA<float>& components) const
{
return std::holds_alternative<Color>(m_style) && std::get<Color>(m_style) == convertColor<SRGBA<uint8_t>>(components);
}
void CanvasStyle::applyStrokeColor(GraphicsContext& context) const
{
WTF::switchOn(m_style,
[&context] (const Color& color) {
context.setStrokeColor(color);
},
[&context] (const RefPtr<CanvasGradient>& gradient) {
context.setStrokeGradient(gradient->gradient());
},
[&context] (const RefPtr<CanvasPattern>& pattern) {
context.setStrokePattern(pattern->pattern());
},
[] (const CurrentColor&) {
ASSERT_NOT_REACHED();
},
[] (const Invalid&) {
ASSERT_NOT_REACHED();
}
);
}
void CanvasStyle::applyFillColor(GraphicsContext& context) const
{
WTF::switchOn(m_style,
[&context] (const Color& color) {
context.setFillColor(color);
},
[&context] (const RefPtr<CanvasGradient>& gradient) {
context.setFillGradient(gradient->gradient());
},
[&context] (const RefPtr<CanvasPattern>& pattern) {
context.setFillPattern(pattern->pattern());
},
[] (const CurrentColor&) {
ASSERT_NOT_REACHED();
},
[] (const Invalid&) {
ASSERT_NOT_REACHED();
}
);
}
}
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