2 * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
3 * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc. All rights reserved.
4 * Copyright (C) 2008-2009 Torch Mobile, Inc.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
22 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
23 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 #include "platform/geometry/IntSize.h"
32 #include "platform/graphics/Color.h"
33 #include "platform/graphics/FrameData.h"
34 #include "platform/graphics/Image.h"
35 #include "platform/graphics/ImageOrientation.h"
36 #include "platform/graphics/ImageSource.h"
37 #include "wtf/Forward.h"
41 class NativeImageSkia;
42 template <typename T> class Timer;
44 class PLATFORM_EXPORT BitmapImage : public Image {
45 friend class GeneratedImage;
46 friend class CrossfadeGeneratedImage;
47 friend class GradientGeneratedImage;
48 friend class GraphicsContext;
50 static PassRefPtr<BitmapImage> create(PassRefPtr<NativeImageSkia> nativeImage, ImageObserver* observer = 0)
52 return adoptRef(new BitmapImage(nativeImage, observer));
54 static PassRefPtr<BitmapImage> create(ImageObserver* observer = 0)
56 return adoptRef(new BitmapImage(observer));
58 virtual ~BitmapImage();
60 virtual bool isBitmapImage() const OVERRIDE;
62 virtual bool currentFrameHasSingleSecurityOrigin() const OVERRIDE { return true; };
64 virtual IntSize size() const OVERRIDE;
65 IntSize sizeRespectingOrientation() const;
66 IntSize currentFrameSize() const;
67 virtual bool getHotSpot(IntPoint&) const OVERRIDE;
69 virtual bool dataChanged(bool allDataReceived) OVERRIDE;
70 bool isAllDataReceived() const;
71 bool hasColorProfile() const;
72 virtual String filenameExtension() const OVERRIDE;
74 // It may look unusual that there is no start animation call as public API. This is because
75 // we start and stop animating lazily. Animation begins whenever someone draws the image. It will
76 // automatically pause once all observers no longer want to render the image anywhere.
77 virtual void stopAnimation() OVERRIDE;
78 virtual void resetAnimation() OVERRIDE;
79 virtual bool maybeAnimated() OVERRIDE;
81 virtual PassRefPtr<NativeImageSkia> nativeImageForCurrentFrame() OVERRIDE;
82 virtual PassRefPtr<Image> imageForDefaultFrame() OVERRIDE;
83 virtual bool currentFrameKnownToBeOpaque() OVERRIDE;
85 ImageOrientation currentFrameOrientation();
88 virtual bool notSolidColor() OVERRIDE;
92 friend class BitmapImageTest;
94 void updateSize() const;
97 enum RepetitionCountStatus {
98 Unknown, // We haven't checked the source's repetition count.
99 Uncertain, // We have a repetition count, but it might be wrong (some GIFs have a count after the image data, and will report "loop once" until all data has been decoded).
100 Certain // The repetition count is known to be correct.
103 BitmapImage(PassRefPtr<NativeImageSkia>, ImageObserver* = 0);
104 BitmapImage(ImageObserver* = 0);
106 virtual void draw(GraphicsContext*, const FloatRect& dstRect, const FloatRect& srcRect, CompositeOperator, WebBlendMode) OVERRIDE;
107 virtual void draw(GraphicsContext*, const FloatRect& dstRect, const FloatRect& srcRect, CompositeOperator, WebBlendMode, RespectImageOrientationEnum) OVERRIDE;
109 size_t currentFrame() const { return m_currentFrame; }
111 PassRefPtr<NativeImageSkia> frameAtIndex(size_t);
112 bool frameIsCompleteAtIndex(size_t);
113 float frameDurationAtIndex(size_t);
114 bool frameHasAlphaAtIndex(size_t);
115 ImageOrientation frameOrientationAtIndex(size_t);
117 // Decodes and caches a frame. Never accessed except internally.
118 void cacheFrame(size_t index);
119 // Called before accessing m_frames[index]. Returns false on index out of bounds.
120 bool ensureFrameIsCached(size_t index);
122 // Called to invalidate cached data. When |destroyAll| is true, we wipe out
123 // the entire frame buffer cache and tell the image source to destroy
124 // everything; this is used when e.g. we want to free some room in the image
125 // cache. If |destroyAll| is false, we delete frames except the current
126 // frame; this is used while animating large images to keep memory footprint
127 // low; the decoder should preserve the current frame and may preserve some
128 // other frames to avoid redecoding the whole image on every frame.
129 virtual void destroyDecodedData(bool destroyAll) OVERRIDE;
131 // If the image is large enough, calls destroyDecodedData().
132 void destroyDecodedDataIfNecessary();
134 // Generally called by destroyDecodedData(), destroys whole-image metadata
135 // and notifies observers that the memory footprint has (hopefully)
136 // decreased by |frameBytesCleared|.
137 void destroyMetadataAndNotify(size_t frameBytesCleared);
139 // Whether or not size is available yet.
140 bool isSizeAvailable();
143 int repetitionCount(bool imageKnownToBeComplete); // |imageKnownToBeComplete| should be set if the caller knows the entire image has been decoded.
144 bool shouldAnimate();
145 virtual void startAnimation(CatchUpAnimation = CatchUp) OVERRIDE;
146 void advanceAnimation(Timer<BitmapImage>*);
148 // Function that does the real work of advancing the animation. When
149 // skippingFrames is true, we're in the middle of a loop trying to skip over
150 // a bunch of animation frames, so we should not do things like decode each
151 // one or notify our observers.
152 // Returns whether the animation was advanced.
153 bool internalAdvanceAnimation(bool skippingFrames);
155 // Checks to see if the image is a 1x1 solid color. We optimize these images and just do a fill rect instead.
156 // This check should happen regardless whether m_checkedForSolidColor is already set, as the frame may have
158 void checkForSolidColor();
160 virtual bool mayFillWithSolidColor() OVERRIDE;
161 virtual Color solidColor() const OVERRIDE;
163 ImageSource m_source;
164 mutable IntSize m_size; // The size to use for the overall image (will just be the size of the first image).
165 mutable IntSize m_sizeRespectingOrientation;
167 size_t m_currentFrame; // The index of the current frame of animation.
168 Vector<FrameData, 1> m_frames; // An array of the cached frames of the animation. We have to ref frames to pin them in the cache.
170 Timer<BitmapImage>* m_frameTimer;
171 int m_repetitionCount; // How many total animation loops we should do. This will be cAnimationNone if this image type is incapable of animation.
172 RepetitionCountStatus m_repetitionCountStatus;
173 int m_repetitionsComplete; // How many repetitions we've finished.
174 double m_desiredFrameStartTime; // The system time at which we hope to see the next call to startAnimation().
176 Color m_solidColor; // If we're a 1x1 solid color, this is the color to use to fill.
180 bool m_isSolidColor : 1; // Whether or not we are a 1x1 solid image.
181 bool m_checkedForSolidColor : 1; // Whether we've checked the frame for solid color.
183 bool m_animationFinished : 1; // Whether or not we've completed the entire animation.
185 bool m_allDataReceived : 1; // Whether or not we've received all our data.
186 mutable bool m_haveSize : 1; // Whether or not our |m_size| member variable has the final overall image size yet.
187 bool m_sizeAvailable : 1; // Whether or not we can obtain the size of the first image frame yet from ImageIO.
188 mutable bool m_hasUniformFrameSize : 1;
189 mutable bool m_haveFrameCount : 1;
192 DEFINE_IMAGE_TYPE_CASTS(BitmapImage);