1 /*
2 * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
3 * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include "config.h"
28 #include "Image.h"
29
30 #include "AffineTransform.h"
31 #include "BitmapImage.h"
32 #include "GraphicsContext.h"
33 #include "IntRect.h"
34 #include "MIMETypeRegistry.h"
35 #include <wtf/StdLibExtras.h>
36
37 #include <math.h>
38
39 #if PLATFORM(CG)
40 #include <CoreFoundation/CoreFoundation.h>
41 #endif
42
43 namespace WebCore {
44
Image(ImageObserver * observer)45 Image::Image(ImageObserver* observer)
46 : m_imageObserver(observer)
47 {
48 }
49
~Image()50 Image::~Image()
51 {
52 }
53
nullImage()54 Image* Image::nullImage()
55 {
56 DEFINE_STATIC_LOCAL(RefPtr<Image>, nullImage, (BitmapImage::create()));;
57 return nullImage.get();
58 }
59
supportsType(const String & type)60 bool Image::supportsType(const String& type)
61 {
62 return MIMETypeRegistry::isSupportedImageResourceMIMEType(type);
63 }
64
setData(PassRefPtr<SharedBuffer> data,bool allDataReceived)65 bool Image::setData(PassRefPtr<SharedBuffer> data, bool allDataReceived)
66 {
67 m_data = data;
68 if (!m_data.get())
69 return true;
70
71 int length = m_data->size();
72 if (!length)
73 return true;
74
75 return dataChanged(allDataReceived);
76 }
77
fillWithSolidColor(GraphicsContext * ctxt,const FloatRect & dstRect,const Color & color,ColorSpace styleColorSpace,CompositeOperator op)78 void Image::fillWithSolidColor(GraphicsContext* ctxt, const FloatRect& dstRect, const Color& color, ColorSpace styleColorSpace, CompositeOperator op)
79 {
80 if (color.alpha() <= 0)
81 return;
82
83 ctxt->save();
84 ctxt->setCompositeOperation(!color.hasAlpha() && op == CompositeSourceOver ? CompositeCopy : op);
85 ctxt->fillRect(dstRect, color, styleColorSpace);
86 ctxt->restore();
87 }
88
calculatePatternScale(const FloatRect & dstRect,const FloatRect & srcRect,Image::TileRule hRule,Image::TileRule vRule)89 static inline FloatSize calculatePatternScale(const FloatRect& dstRect, const FloatRect& srcRect, Image::TileRule hRule, Image::TileRule vRule)
90 {
91 float scaleX = 1.0f, scaleY = 1.0f;
92
93 if (hRule == Image::StretchTile)
94 scaleX = dstRect.width() / srcRect.width();
95 if (vRule == Image::StretchTile)
96 scaleY = dstRect.height() / srcRect.height();
97
98 if (hRule == Image::RepeatTile)
99 scaleX = scaleY;
100 if (vRule == Image::RepeatTile)
101 scaleY = scaleX;
102
103 return FloatSize(scaleX, scaleY);
104 }
105
106
drawTiled(GraphicsContext * ctxt,const FloatRect & destRect,const FloatPoint & srcPoint,const FloatSize & scaledTileSize,ColorSpace styleColorSpace,CompositeOperator op)107 void Image::drawTiled(GraphicsContext* ctxt, const FloatRect& destRect, const FloatPoint& srcPoint, const FloatSize& scaledTileSize, ColorSpace styleColorSpace, CompositeOperator op)
108 {
109 if (mayFillWithSolidColor()) {
110 fillWithSolidColor(ctxt, destRect, solidColor(), styleColorSpace, op);
111 return;
112 }
113
114 FloatSize intrinsicTileSize = size();
115 if (hasRelativeWidth())
116 intrinsicTileSize.setWidth(scaledTileSize.width());
117 if (hasRelativeHeight())
118 intrinsicTileSize.setHeight(scaledTileSize.height());
119
120 FloatSize scale(scaledTileSize.width() / intrinsicTileSize.width(),
121 scaledTileSize.height() / intrinsicTileSize.height());
122
123 FloatRect oneTileRect;
124 oneTileRect.setX(destRect.x() + fmodf(fmodf(-srcPoint.x(), scaledTileSize.width()) - scaledTileSize.width(), scaledTileSize.width()));
125 oneTileRect.setY(destRect.y() + fmodf(fmodf(-srcPoint.y(), scaledTileSize.height()) - scaledTileSize.height(), scaledTileSize.height()));
126 oneTileRect.setSize(scaledTileSize);
127
128 // Check and see if a single draw of the image can cover the entire area we are supposed to tile.
129 if (oneTileRect.contains(destRect)) {
130 FloatRect visibleSrcRect;
131 visibleSrcRect.setX((destRect.x() - oneTileRect.x()) / scale.width());
132 visibleSrcRect.setY((destRect.y() - oneTileRect.y()) / scale.height());
133 visibleSrcRect.setWidth(destRect.width() / scale.width());
134 visibleSrcRect.setHeight(destRect.height() / scale.height());
135 draw(ctxt, destRect, visibleSrcRect, styleColorSpace, op);
136 return;
137 }
138
139 AffineTransform patternTransform = AffineTransform().scaleNonUniform(scale.width(), scale.height());
140 FloatRect tileRect(FloatPoint(), intrinsicTileSize);
141 drawPattern(ctxt, tileRect, patternTransform, oneTileRect.location(), styleColorSpace, op, destRect);
142
143 startAnimation();
144 }
145
146 // FIXME: Merge with the other drawTiled eventually, since we need a combination of both for some things.
drawTiled(GraphicsContext * ctxt,const FloatRect & dstRect,const FloatRect & srcRect,TileRule hRule,TileRule vRule,ColorSpace styleColorSpace,CompositeOperator op)147 void Image::drawTiled(GraphicsContext* ctxt, const FloatRect& dstRect, const FloatRect& srcRect, TileRule hRule, TileRule vRule, ColorSpace styleColorSpace, CompositeOperator op)
148 {
149 if (mayFillWithSolidColor()) {
150 fillWithSolidColor(ctxt, dstRect, solidColor(), styleColorSpace, op);
151 return;
152 }
153
154 // FIXME: We do not support 'round' yet. For now just map it to 'repeat'.
155 if (hRule == RoundTile)
156 hRule = RepeatTile;
157 if (vRule == RoundTile)
158 vRule = RepeatTile;
159
160 FloatSize scale = calculatePatternScale(dstRect, srcRect, hRule, vRule);
161 AffineTransform patternTransform = AffineTransform().scaleNonUniform(scale.width(), scale.height());
162
163 // We want to construct the phase such that the pattern is centered (when stretch is not
164 // set for a particular rule).
165 float hPhase = scale.width() * srcRect.x();
166 float vPhase = scale.height() * srcRect.y();
167 if (hRule == Image::RepeatTile)
168 hPhase -= fmodf(dstRect.width(), scale.width() * srcRect.width()) / 2.0f;
169 if (vRule == Image::RepeatTile)
170 vPhase -= fmodf(dstRect.height(), scale.height() * srcRect.height()) / 2.0f;
171 FloatPoint patternPhase(dstRect.x() - hPhase, dstRect.y() - vPhase);
172
173 drawPattern(ctxt, srcRect, patternTransform, patternPhase, styleColorSpace, op, dstRect);
174
175 startAnimation();
176 }
177
178
179 }
180