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 "platform/graphics/Image.h"
29
30 #include "platform/Length.h"
31 #include "platform/MIMETypeRegistry.h"
32 #include "platform/SharedBuffer.h"
33 #include "platform/TraceEvent.h"
34 #include "platform/geometry/FloatPoint.h"
35 #include "platform/geometry/FloatRect.h"
36 #include "platform/geometry/FloatSize.h"
37 #include "platform/graphics/BitmapImage.h"
38 #include "platform/graphics/GraphicsContext.h"
39 #include "platform/graphics/GraphicsContextStateSaver.h"
40 #include "public/platform/Platform.h"
41 #include "public/platform/WebData.h"
42 #include "wtf/MainThread.h"
43 #include "wtf/StdLibExtras.h"
44
45 #include <math.h>
46
47 namespace WebCore {
48
Image(ImageObserver * observer)49 Image::Image(ImageObserver* observer)
50 : m_imageObserver(observer)
51 {
52 }
53
~Image()54 Image::~Image()
55 {
56 }
57
nullImage()58 Image* Image::nullImage()
59 {
60 ASSERT(isMainThread());
61 DEFINE_STATIC_REF(Image, nullImage, (BitmapImage::create()));
62 return nullImage;
63 }
64
loadPlatformResource(const char * name)65 PassRefPtr<Image> Image::loadPlatformResource(const char *name)
66 {
67 const blink::WebData& resource = blink::Platform::current()->loadResource(name);
68 if (resource.isEmpty())
69 return Image::nullImage();
70
71 RefPtr<Image> image = BitmapImage::create();
72 image->setData(resource, true);
73 return image.release();
74 }
75
supportsType(const String & type)76 bool Image::supportsType(const String& type)
77 {
78 return MIMETypeRegistry::isSupportedImageResourceMIMEType(type);
79 }
80
setData(PassRefPtr<SharedBuffer> data,bool allDataReceived)81 bool Image::setData(PassRefPtr<SharedBuffer> data, bool allDataReceived)
82 {
83 m_encodedImageData = data;
84 if (!m_encodedImageData.get())
85 return true;
86
87 int length = m_encodedImageData->size();
88 if (!length)
89 return true;
90
91 return dataChanged(allDataReceived);
92 }
93
fillWithSolidColor(GraphicsContext * ctxt,const FloatRect & dstRect,const Color & color,CompositeOperator op)94 void Image::fillWithSolidColor(GraphicsContext* ctxt, const FloatRect& dstRect, const Color& color, CompositeOperator op)
95 {
96 if (!color.alpha())
97 return;
98
99 CompositeOperator previousOperator = ctxt->compositeOperation();
100 ctxt->setCompositeOperation(!color.hasAlpha() && op == CompositeSourceOver ? CompositeCopy : op);
101 ctxt->fillRect(dstRect, color);
102 ctxt->setCompositeOperation(previousOperator);
103 }
104
adjustForNegativeSize(const FloatRect & rect)105 FloatRect Image::adjustForNegativeSize(const FloatRect& rect)
106 {
107 FloatRect norm = rect;
108 if (norm.width() < 0) {
109 norm.setX(norm.x() + norm.width());
110 norm.setWidth(-norm.width());
111 }
112 if (norm.height() < 0) {
113 norm.setY(norm.y() + norm.height());
114 norm.setHeight(-norm.height());
115 }
116 return norm;
117 }
118
draw(GraphicsContext * ctx,const FloatRect & dstRect,const FloatRect & srcRect,CompositeOperator op,blink::WebBlendMode blendMode,RespectImageOrientationEnum)119 void Image::draw(GraphicsContext* ctx, const FloatRect& dstRect, const FloatRect& srcRect, CompositeOperator op, blink::WebBlendMode blendMode, RespectImageOrientationEnum)
120 {
121 draw(ctx, dstRect, srcRect, op, blendMode);
122 }
123
drawTiled(GraphicsContext * ctxt,const FloatRect & destRect,const FloatPoint & srcPoint,const FloatSize & scaledTileSize,CompositeOperator op,blink::WebBlendMode blendMode,const IntSize & repeatSpacing)124 void Image::drawTiled(GraphicsContext* ctxt, const FloatRect& destRect, const FloatPoint& srcPoint, const FloatSize& scaledTileSize, CompositeOperator op, blink::WebBlendMode blendMode, const IntSize& repeatSpacing)
125 {
126 if (mayFillWithSolidColor()) {
127 fillWithSolidColor(ctxt, destRect, solidColor(), op);
128 return;
129 }
130
131 // See <https://webkit.org/b/59043>.
132 ASSERT(!isBitmapImage() || notSolidColor());
133
134 FloatSize intrinsicTileSize = size();
135 if (hasRelativeWidth())
136 intrinsicTileSize.setWidth(scaledTileSize.width());
137 if (hasRelativeHeight())
138 intrinsicTileSize.setHeight(scaledTileSize.height());
139
140 FloatSize scale(scaledTileSize.width() / intrinsicTileSize.width(),
141 scaledTileSize.height() / intrinsicTileSize.height());
142
143 FloatSize actualTileSize(scaledTileSize.width() + repeatSpacing.width(), scaledTileSize.height() + repeatSpacing.height());
144 FloatRect oneTileRect;
145 oneTileRect.setX(destRect.x() + fmodf(fmodf(-srcPoint.x(), actualTileSize.width()) - actualTileSize.width(), actualTileSize.width()));
146 oneTileRect.setY(destRect.y() + fmodf(fmodf(-srcPoint.y(), actualTileSize.height()) - actualTileSize.height(), actualTileSize.height()));
147 oneTileRect.setSize(scaledTileSize);
148
149 // Check and see if a single draw of the image can cover the entire area we are supposed to tile.
150 if (oneTileRect.contains(destRect)) {
151 FloatRect visibleSrcRect;
152 visibleSrcRect.setX((destRect.x() - oneTileRect.x()) / scale.width());
153 visibleSrcRect.setY((destRect.y() - oneTileRect.y()) / scale.height());
154 visibleSrcRect.setWidth(destRect.width() / scale.width());
155 visibleSrcRect.setHeight(destRect.height() / scale.height());
156 draw(ctxt, destRect, visibleSrcRect, op, blendMode);
157 return;
158 }
159
160 FloatRect tileRect(FloatPoint(), intrinsicTileSize);
161 drawPattern(ctxt, tileRect, scale, oneTileRect.location(), op, destRect, blendMode, repeatSpacing);
162
163 startAnimation();
164 }
165
166 // 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,const FloatSize & providedTileScaleFactor,TileRule hRule,TileRule vRule,CompositeOperator op)167 void Image::drawTiled(GraphicsContext* ctxt, const FloatRect& dstRect, const FloatRect& srcRect,
168 const FloatSize& providedTileScaleFactor, TileRule hRule, TileRule vRule, CompositeOperator op)
169 {
170 if (mayFillWithSolidColor()) {
171 fillWithSolidColor(ctxt, dstRect, solidColor(), op);
172 return;
173 }
174
175 // FIXME: We do not support 'space' yet. For now just map it to 'repeat'.
176 if (hRule == SpaceTile)
177 hRule = RepeatTile;
178 if (vRule == SpaceTile)
179 vRule = RepeatTile;
180
181 // FIXME: if this code is used for background-repeat: round (in addition to
182 // border-image-repeat), then add logic to deal with the background-size: auto
183 // special case. The aspect ratio should be maintained in this case.
184 FloatSize tileScaleFactor = providedTileScaleFactor;
185 bool useLowInterpolationQuality = false;
186 if (hRule == RoundTile) {
187 float hRepetitions = std::max(1.0f, roundf(dstRect.width() / (tileScaleFactor.width() * srcRect.width())));
188 tileScaleFactor.setWidth(dstRect.width() / (srcRect.width() * hRepetitions));
189 }
190 if (vRule == RoundTile) {
191 float vRepetitions = std::max(1.0f, roundf(dstRect.height() / (tileScaleFactor.height() * srcRect.height())));
192 tileScaleFactor.setHeight(dstRect.height() / (srcRect.height() * vRepetitions));
193 }
194 if (hRule == RoundTile || vRule == RoundTile) {
195 // High interpolation quality rounds the scaled tile to an integer size (see Image::drawPattern).
196 // To avoid causing a visual problem, linear interpolation must be used instead.
197 // FIXME: Allow using high-quality interpolation in this case, too.
198 useLowInterpolationQuality = true;
199 }
200
201 // We want to construct the phase such that the pattern is centered (when stretch is not
202 // set for a particular rule).
203 float hPhase = tileScaleFactor.width() * srcRect.x();
204 float vPhase = tileScaleFactor.height() * srcRect.y();
205 float scaledTileWidth = tileScaleFactor.width() * srcRect.width();
206 float scaledTileHeight = tileScaleFactor.height() * srcRect.height();
207 if (hRule == Image::RepeatTile)
208 hPhase -= (dstRect.width() - scaledTileWidth) / 2;
209 if (vRule == Image::RepeatTile)
210 vPhase -= (dstRect.height() - scaledTileHeight) / 2;
211 FloatPoint patternPhase(dstRect.x() - hPhase, dstRect.y() - vPhase);
212
213 if (useLowInterpolationQuality) {
214 InterpolationQuality previousInterpolationQuality = ctxt->imageInterpolationQuality();
215 ctxt->setImageInterpolationQuality(InterpolationLow);
216 drawPattern(ctxt, srcRect, tileScaleFactor, patternPhase, op, dstRect);
217 ctxt->setImageInterpolationQuality(previousInterpolationQuality);
218 } else {
219 drawPattern(ctxt, srcRect, tileScaleFactor, patternPhase, op, dstRect);
220 }
221
222 startAnimation();
223 }
224
drawPattern(GraphicsContext * context,const FloatRect & floatSrcRect,const FloatSize & scale,const FloatPoint & phase,CompositeOperator compositeOp,const FloatRect & destRect,blink::WebBlendMode blendMode,const IntSize & repeatSpacing)225 void Image::drawPattern(GraphicsContext* context, const FloatRect& floatSrcRect, const FloatSize& scale,
226 const FloatPoint& phase, CompositeOperator compositeOp, const FloatRect& destRect, blink::WebBlendMode blendMode, const IntSize& repeatSpacing)
227 {
228 TRACE_EVENT0("skia", "Image::drawPattern");
229 if (RefPtr<NativeImageSkia> bitmap = nativeImageForCurrentFrame())
230 bitmap->drawPattern(context, adjustForNegativeSize(floatSrcRect), scale, phase, compositeOp, destRect, blendMode, repeatSpacing);
231 }
232
computeIntrinsicDimensions(Length & intrinsicWidth,Length & intrinsicHeight,FloatSize & intrinsicRatio)233 void Image::computeIntrinsicDimensions(Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio)
234 {
235 intrinsicRatio = size();
236 intrinsicWidth = Length(intrinsicRatio.width(), Fixed);
237 intrinsicHeight = Length(intrinsicRatio.height(), Fixed);
238 }
239
240 }
241