2 * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
3 * Copyright (C) 2008, 2010 Nokia Corporation and/or its subsidiary(-ies)
4 * Copyright (C) 2007 Alp Toker <alp@atoker.com>
5 * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
20 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
21 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
24 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 #include "core/html/canvas/CanvasStyle.h"
32 #include "CSSPropertyNames.h"
33 #include "core/css/parser/BisonCSSParser.h"
34 #include "core/css/StylePropertySet.h"
35 #include "core/html/HTMLCanvasElement.h"
36 #include "core/html/canvas/CanvasGradient.h"
37 #include "core/html/canvas/CanvasPattern.h"
38 #include "platform/graphics/GraphicsContext.h"
39 #include "wtf/PassRefPtr.h"
43 enum ColorParseResult { ParsedRGBA, ParsedCurrentColor, ParsedSystemColor, ParseFailed };
45 static ColorParseResult parseColor(RGBA32& parsedColor, const String& colorString)
47 if (equalIgnoringCase(colorString, "currentcolor"))
48 return ParsedCurrentColor;
49 const bool useStrictParsing = true;
50 if (BisonCSSParser::parseColor(parsedColor, colorString, useStrictParsing))
52 if (BisonCSSParser::parseSystemColor(parsedColor, colorString))
53 return ParsedSystemColor;
57 RGBA32 currentColor(HTMLCanvasElement* canvas)
59 if (!canvas || !canvas->inDocument() || !canvas->inlineStyle())
61 RGBA32 rgba = Color::black;
62 BisonCSSParser::parseColor(rgba, canvas->inlineStyle()->getPropertyValue(CSSPropertyColor));
66 bool parseColorOrCurrentColor(RGBA32& parsedColor, const String& colorString, HTMLCanvasElement* canvas)
68 ColorParseResult parseResult = parseColor(parsedColor, colorString);
69 switch (parseResult) {
71 case ParsedSystemColor:
73 case ParsedCurrentColor:
74 parsedColor = currentColor(canvas);
84 CanvasStyle::CanvasStyle(Type type, float overrideAlpha)
86 , m_overrideAlpha(overrideAlpha)
90 CanvasStyle::CanvasStyle(RGBA32 rgba)
96 CanvasStyle::CanvasStyle(float grayLevel, float alpha)
98 , m_rgba(makeRGBA32FromFloats(grayLevel, grayLevel, grayLevel, alpha))
102 CanvasStyle::CanvasStyle(float r, float g, float b, float a)
104 , m_rgba(makeRGBA32FromFloats(r, g, b, a))
108 CanvasStyle::CanvasStyle(float c, float m, float y, float k, float a)
110 , m_rgba(makeRGBAFromCMYKA(c, m, y, k, a))
111 , m_cmyka(c, m, y, k, a)
115 CanvasStyle::CanvasStyle(PassRefPtr<CanvasGradient> gradient)
117 , m_gradient(gradient)
121 CanvasStyle::CanvasStyle(PassRefPtr<CanvasPattern> pattern)
122 : m_type(ImagePattern)
127 PassRefPtr<CanvasStyle> CanvasStyle::createFromString(const String& color)
130 ColorParseResult parseResult = parseColor(rgba, color);
131 switch (parseResult) {
133 case ParsedSystemColor:
134 return adoptRef(new CanvasStyle(rgba));
135 case ParsedCurrentColor:
136 return adoptRef(new CanvasStyle(CurrentColor));
140 ASSERT_NOT_REACHED();
145 PassRefPtr<CanvasStyle> CanvasStyle::createFromStringWithOverrideAlpha(const String& color, float alpha)
148 ColorParseResult parseResult = parseColor(rgba, color);
149 switch (parseResult) {
151 return adoptRef(new CanvasStyle(colorWithOverrideAlpha(rgba, alpha)));
152 case ParsedCurrentColor:
153 return adoptRef(new CanvasStyle(CurrentColorWithOverrideAlpha, alpha));
157 ASSERT_NOT_REACHED();
162 PassRefPtr<CanvasStyle> CanvasStyle::createFromGradient(PassRefPtr<CanvasGradient> gradient)
166 return adoptRef(new CanvasStyle(gradient));
169 PassRefPtr<CanvasStyle> CanvasStyle::createFromPattern(PassRefPtr<CanvasPattern> pattern)
173 return adoptRef(new CanvasStyle(pattern));
176 bool CanvasStyle::isEquivalentColor(const CanvasStyle& other) const
178 if (m_type != other.m_type)
183 return m_rgba == other.m_rgba;
185 return m_cmyka.c == other.m_cmyka.c
186 && m_cmyka.m == other.m_cmyka.m
187 && m_cmyka.y == other.m_cmyka.y
188 && m_cmyka.k == other.m_cmyka.k
189 && m_cmyka.a == other.m_cmyka.a;
193 case CurrentColorWithOverrideAlpha:
197 ASSERT_NOT_REACHED();
201 bool CanvasStyle::isEquivalentRGBA(float r, float g, float b, float a) const
206 return m_rgba == makeRGBA32FromFloats(r, g, b, a);
209 bool CanvasStyle::isEquivalentCMYKA(float c, float m, float y, float k, float a) const
214 return c == m_cmyka.c
221 void CanvasStyle::applyStrokeColor(GraphicsContext* context)
227 context->setStrokeColor(m_rgba);
230 // FIXME: Do this through platform-independent GraphicsContext API.
231 // We'll need a fancier Color abstraction to support CMYKA correctly
232 context->setStrokeColor(m_rgba);
236 context->setStrokeGradient(canvasGradient()->gradient());
239 context->setStrokePattern(canvasPattern()->pattern());
242 case CurrentColorWithOverrideAlpha:
243 ASSERT_NOT_REACHED();
248 void CanvasStyle::applyFillColor(GraphicsContext* context)
254 context->setFillColor(m_rgba);
257 // FIXME: Do this through platform-independent GraphicsContext API.
258 // We'll need a fancier Color abstraction to support CMYKA correctly
259 context->setFillColor(m_rgba);
263 context->setFillGradient(canvasGradient()->gradient());
266 context->setFillPattern(canvasPattern()->pattern());
269 case CurrentColorWithOverrideAlpha:
270 ASSERT_NOT_REACHED();