1 /*
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>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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.
15 *
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.
27 */
28
29 #include "config.h"
30 #include "core/html/canvas/CanvasStyle.h"
31
32 #include "core/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"
40
41 namespace WebCore {
42
43 enum ColorParseResult { ParsedRGBA, ParsedCurrentColor, ParsedSystemColor, ParseFailed };
44
parseColor(RGBA32 & parsedColor,const String & colorString)45 static ColorParseResult parseColor(RGBA32& parsedColor, const String& colorString)
46 {
47 if (equalIgnoringCase(colorString, "currentcolor"))
48 return ParsedCurrentColor;
49 const bool useStrictParsing = true;
50 if (BisonCSSParser::parseColor(parsedColor, colorString, useStrictParsing))
51 return ParsedRGBA;
52 if (BisonCSSParser::parseSystemColor(parsedColor, colorString))
53 return ParsedSystemColor;
54 return ParseFailed;
55 }
56
currentColor(HTMLCanvasElement * canvas)57 RGBA32 currentColor(HTMLCanvasElement* canvas)
58 {
59 if (!canvas || !canvas->inDocument() || !canvas->inlineStyle())
60 return Color::black;
61 RGBA32 rgba = Color::black;
62 BisonCSSParser::parseColor(rgba, canvas->inlineStyle()->getPropertyValue(CSSPropertyColor));
63 return rgba;
64 }
65
parseColorOrCurrentColor(RGBA32 & parsedColor,const String & colorString,HTMLCanvasElement * canvas)66 bool parseColorOrCurrentColor(RGBA32& parsedColor, const String& colorString, HTMLCanvasElement* canvas)
67 {
68 ColorParseResult parseResult = parseColor(parsedColor, colorString);
69 switch (parseResult) {
70 case ParsedRGBA:
71 case ParsedSystemColor:
72 return true;
73 case ParsedCurrentColor:
74 parsedColor = currentColor(canvas);
75 return true;
76 case ParseFailed:
77 return false;
78 default:
79 ASSERT_NOT_REACHED();
80 return false;
81 }
82 }
83
CanvasStyle(Type type,float overrideAlpha)84 CanvasStyle::CanvasStyle(Type type, float overrideAlpha)
85 : m_type(type)
86 , m_overrideAlpha(overrideAlpha)
87 {
88 }
89
CanvasStyle(RGBA32 rgba)90 CanvasStyle::CanvasStyle(RGBA32 rgba)
91 : m_type(RGBA)
92 , m_rgba(rgba)
93 {
94 }
95
CanvasStyle(float grayLevel,float alpha)96 CanvasStyle::CanvasStyle(float grayLevel, float alpha)
97 : m_type(RGBA)
98 , m_rgba(makeRGBA32FromFloats(grayLevel, grayLevel, grayLevel, alpha))
99 {
100 }
101
CanvasStyle(float r,float g,float b,float a)102 CanvasStyle::CanvasStyle(float r, float g, float b, float a)
103 : m_type(RGBA)
104 , m_rgba(makeRGBA32FromFloats(r, g, b, a))
105 {
106 }
107
CanvasStyle(float c,float m,float y,float k,float a)108 CanvasStyle::CanvasStyle(float c, float m, float y, float k, float a)
109 : m_type(CMYKA)
110 , m_rgba(makeRGBAFromCMYKA(c, m, y, k, a))
111 , m_cmyka(c, m, y, k, a)
112 {
113 }
114
CanvasStyle(PassRefPtr<CanvasGradient> gradient)115 CanvasStyle::CanvasStyle(PassRefPtr<CanvasGradient> gradient)
116 : m_type(Gradient)
117 , m_gradient(gradient)
118 {
119 }
120
CanvasStyle(PassRefPtr<CanvasPattern> pattern)121 CanvasStyle::CanvasStyle(PassRefPtr<CanvasPattern> pattern)
122 : m_type(ImagePattern)
123 , m_pattern(pattern)
124 {
125 }
126
createFromString(const String & color)127 PassRefPtr<CanvasStyle> CanvasStyle::createFromString(const String& color)
128 {
129 RGBA32 rgba;
130 ColorParseResult parseResult = parseColor(rgba, color);
131 switch (parseResult) {
132 case ParsedRGBA:
133 case ParsedSystemColor:
134 return adoptRef(new CanvasStyle(rgba));
135 case ParsedCurrentColor:
136 return adoptRef(new CanvasStyle(CurrentColor));
137 case ParseFailed:
138 return nullptr;
139 default:
140 ASSERT_NOT_REACHED();
141 return nullptr;
142 }
143 }
144
createFromStringWithOverrideAlpha(const String & color,float alpha)145 PassRefPtr<CanvasStyle> CanvasStyle::createFromStringWithOverrideAlpha(const String& color, float alpha)
146 {
147 RGBA32 rgba;
148 ColorParseResult parseResult = parseColor(rgba, color);
149 switch (parseResult) {
150 case ParsedRGBA:
151 return adoptRef(new CanvasStyle(colorWithOverrideAlpha(rgba, alpha)));
152 case ParsedCurrentColor:
153 return adoptRef(new CanvasStyle(CurrentColorWithOverrideAlpha, alpha));
154 case ParseFailed:
155 return nullptr;
156 default:
157 ASSERT_NOT_REACHED();
158 return nullptr;
159 }
160 }
161
createFromGradient(PassRefPtr<CanvasGradient> gradient)162 PassRefPtr<CanvasStyle> CanvasStyle::createFromGradient(PassRefPtr<CanvasGradient> gradient)
163 {
164 if (!gradient)
165 return nullptr;
166 return adoptRef(new CanvasStyle(gradient));
167 }
168
createFromPattern(PassRefPtr<CanvasPattern> pattern)169 PassRefPtr<CanvasStyle> CanvasStyle::createFromPattern(PassRefPtr<CanvasPattern> pattern)
170 {
171 if (!pattern)
172 return nullptr;
173 return adoptRef(new CanvasStyle(pattern));
174 }
175
isEquivalentColor(const CanvasStyle & other) const176 bool CanvasStyle::isEquivalentColor(const CanvasStyle& other) const
177 {
178 if (m_type != other.m_type)
179 return false;
180
181 switch (m_type) {
182 case RGBA:
183 return m_rgba == other.m_rgba;
184 case CMYKA:
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;
190 case Gradient:
191 case ImagePattern:
192 case CurrentColor:
193 case CurrentColorWithOverrideAlpha:
194 return false;
195 }
196
197 ASSERT_NOT_REACHED();
198 return false;
199 }
200
isEquivalentRGBA(float r,float g,float b,float a) const201 bool CanvasStyle::isEquivalentRGBA(float r, float g, float b, float a) const
202 {
203 if (m_type != RGBA)
204 return false;
205
206 return m_rgba == makeRGBA32FromFloats(r, g, b, a);
207 }
208
isEquivalentCMYKA(float c,float m,float y,float k,float a) const209 bool CanvasStyle::isEquivalentCMYKA(float c, float m, float y, float k, float a) const
210 {
211 if (m_type != CMYKA)
212 return false;
213
214 return c == m_cmyka.c
215 && m == m_cmyka.m
216 && y == m_cmyka.y
217 && k == m_cmyka.k
218 && a == m_cmyka.a;
219 }
220
applyStrokeColor(GraphicsContext * context)221 void CanvasStyle::applyStrokeColor(GraphicsContext* context)
222 {
223 if (!context)
224 return;
225 switch (m_type) {
226 case RGBA:
227 context->setStrokeColor(m_rgba);
228 break;
229 case CMYKA: {
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);
233 break;
234 }
235 case Gradient:
236 context->setStrokeGradient(canvasGradient()->gradient());
237 break;
238 case ImagePattern:
239 context->setStrokePattern(canvasPattern()->pattern());
240 break;
241 case CurrentColor:
242 case CurrentColorWithOverrideAlpha:
243 ASSERT_NOT_REACHED();
244 break;
245 }
246 }
247
applyFillColor(GraphicsContext * context)248 void CanvasStyle::applyFillColor(GraphicsContext* context)
249 {
250 if (!context)
251 return;
252 switch (m_type) {
253 case RGBA:
254 context->setFillColor(m_rgba);
255 break;
256 case CMYKA: {
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);
260 break;
261 }
262 case Gradient:
263 context->setFillGradient(canvasGradient()->gradient());
264 break;
265 case ImagePattern:
266 context->setFillPattern(canvasPattern()->pattern());
267 break;
268 case CurrentColor:
269 case CurrentColorWithOverrideAlpha:
270 ASSERT_NOT_REACHED();
271 break;
272 }
273 }
274
275 }
276