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/*
* Copyright (C) 2006, 2008 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 COMPUTER, 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 COMPUTER, 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 "modules/canvas2d/CanvasStyle.h"
#include "core/CSSPropertyNames.h"
#include "core/css/StylePropertySet.h"
#include "core/css/parser/CSSParser.h"
#include "core/html/HTMLCanvasElement.h"
#include "modules/canvas2d/CanvasGradient.h"
#include "modules/canvas2d/CanvasPattern.h"
#include "platform/graphics/skia/SkiaUtils.h"
#include "third_party/skia/include/core/SkShader.h"
#include "wtf/PassRefPtr.h"
namespace blink {
enum ColorParseResult { ParsedRGBA, ParsedCurrentColor, ParsedSystemColor, ParseFailed };
static ColorParseResult parseColor(Color& parsedColor, const String& colorString)
{
if (equalIgnoringCase(colorString, "currentcolor"))
return ParsedCurrentColor;
const bool useStrictParsing = true;
if (CSSParser::parseColor(parsedColor, colorString, useStrictParsing))
return ParsedRGBA;
if (CSSParser::parseSystemColor(parsedColor, colorString))
return ParsedSystemColor;
return ParseFailed;
}
static Color currentColor(HTMLCanvasElement* canvas)
{
if (!canvas || !canvas->isConnected() || !canvas->inlineStyle())
return Color::black;
Color color = Color::black;
CSSParser::parseColor(color, canvas->inlineStyle()->getPropertyValue(CSSPropertyColor));
return color;
}
bool parseColorOrCurrentColor(Color& parsedColor, const String& colorString, HTMLCanvasElement* canvas)
{
ColorParseResult parseResult = parseColor(parsedColor, colorString);
switch (parseResult) {
case ParsedRGBA:
case ParsedSystemColor:
return true;
case ParsedCurrentColor:
parsedColor = canvas ? currentColor(canvas) : Color::black;
return true;
case ParseFailed:
return false;
default:
ASSERT_NOT_REACHED();
return false;
}
}
CanvasStyle::CanvasStyle(RGBA32 rgba)
: m_type(ColorRGBA)
, m_rgba(rgba)
{
}
CanvasStyle::CanvasStyle(CanvasGradient* gradient)
: m_type(Gradient)
, m_gradient(gradient)
{
}
CanvasStyle::CanvasStyle(CanvasPattern* pattern)
: m_type(ImagePattern)
, m_pattern(pattern)
{
}
CanvasStyle* CanvasStyle::createFromGradient(CanvasGradient* gradient)
{
ASSERT(gradient);
return new CanvasStyle(gradient);
}
CanvasStyle* CanvasStyle::createFromPattern(CanvasPattern* pattern)
{
ASSERT(pattern);
return new CanvasStyle(pattern);
}
void CanvasStyle::applyToPaint(SkPaint& paint) const
{
switch (m_type) {
case ColorRGBA:
paint.setShader(nullptr);
break;
case Gradient:
getCanvasGradient()->getGradient()->applyToPaint(paint, SkMatrix::I());
break;
case ImagePattern:
getCanvasPattern()->getPattern()->applyToPaint(paint, affineTransformToSkMatrix(getCanvasPattern()->getTransform()));
break;
default:
ASSERT_NOT_REACHED();
}
}
RGBA32 CanvasStyle::paintColor() const
{
if (m_type == ColorRGBA)
return m_rgba;
ASSERT(m_type == Gradient || m_type == ImagePattern);
return Color::black;
}
DEFINE_TRACE(CanvasStyle)
{
visitor->trace(m_gradient);
visitor->trace(m_pattern);
}
} // namespace blink