2 * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
3 * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
30 #include "platform/PlatformExport.h"
31 #include "platform/geometry/IntRect.h"
32 #include "platform/graphics/Color.h"
33 #include "platform/graphics/GraphicsTypes.h"
34 #include "platform/graphics/ImageOrientation.h"
35 #include "platform/graphics/skia/NativeImageSkia.h"
36 #include "third_party/skia/include/core/SkXfermode.h"
37 #include "wtf/Assertions.h"
38 #include "wtf/PassRefPtr.h"
39 #include "wtf/RefCounted.h"
40 #include "wtf/RefPtr.h"
41 #include "wtf/RetainPtr.h"
42 #include "wtf/text/WTFString.h"
49 class GraphicsContext;
53 // This class gets notified when an image creates or destroys decoded frames and when it advances animation frames.
56 class PLATFORM_EXPORT Image : public RefCounted<Image> {
57 friend class GeneratedImage;
58 friend class CrossfadeGeneratedImage;
59 friend class GradientGeneratedImage;
60 friend class GraphicsContext;
65 static PassRefPtr<Image> loadPlatformResource(const char* name);
66 static bool supportsType(const String&);
68 virtual bool isSVGImage() const { return false; }
69 virtual bool isBitmapImage() const { return false; }
70 virtual bool currentFrameKnownToBeOpaque() = 0;
72 // Derived classes should override this if they can assure that the current
73 // image frame contains only resources from its own security origin.
74 virtual bool currentFrameHasSingleSecurityOrigin() const { return false; }
76 static Image* nullImage();
77 bool isNull() const { return size().isEmpty(); }
79 virtual void setContainerSize(const IntSize&) { }
80 virtual bool usesContainerSize() const { return false; }
81 virtual bool hasRelativeWidth() const { return false; }
82 virtual bool hasRelativeHeight() const { return false; }
83 virtual void computeIntrinsicDimensions(Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio);
85 virtual IntSize size() const = 0;
86 IntRect rect() const { return IntRect(IntPoint(), size()); }
87 int width() const { return size().width(); }
88 int height() const { return size().height(); }
89 virtual bool getHotSpot(IntPoint&) const { return false; }
91 bool setData(PassRefPtr<SharedBuffer> data, bool allDataReceived);
92 virtual bool dataChanged(bool /*allDataReceived*/) { return false; }
94 virtual String filenameExtension() const { return String(); } // null string if unknown
96 virtual void destroyDecodedData(bool destroyAll) = 0;
98 SharedBuffer* data() { return m_encodedImageData.get(); }
100 // Animation begins whenever someone draws the image, so startAnimation() is not normally called.
101 // It will automatically pause once all observers no longer want to render the image anywhere.
102 enum CatchUpAnimation { DoNotCatchUp, CatchUp };
103 virtual void startAnimation(CatchUpAnimation = CatchUp) { }
104 virtual void stopAnimation() {}
105 virtual void resetAnimation() {}
107 // True if this image can potentially animate.
108 virtual bool maybeAnimated() { return false; }
110 // Typically the ImageResource that owns us.
111 ImageObserver* imageObserver() const { return m_imageObserver; }
112 void setImageObserver(ImageObserver* observer) { m_imageObserver = observer; }
114 enum TileRule { StretchTile, RoundTile, SpaceTile, RepeatTile };
116 virtual PassRefPtr<NativeImageSkia> nativeImageForCurrentFrame() { return nullptr; }
118 virtual PassRefPtr<Image> imageForDefaultFrame();
120 virtual void drawPattern(GraphicsContext*, const FloatRect&,
121 const FloatSize&, const FloatPoint& phase, CompositeOperator,
122 const FloatRect&, WebBlendMode = WebBlendModeNormal, const IntSize& repeatSpacing = IntSize());
125 virtual bool notSolidColor() { return true; }
129 Image(ImageObserver* = 0);
131 static void fillWithSolidColor(GraphicsContext*, const FloatRect& dstRect, const Color&, CompositeOperator);
132 static FloatRect adjustForNegativeSize(const FloatRect&); // A helper method for translating negative width and height values.
134 virtual void draw(GraphicsContext*, const FloatRect& dstRect, const FloatRect& srcRect, CompositeOperator, WebBlendMode) = 0;
135 virtual void draw(GraphicsContext*, const FloatRect& dstRect, const FloatRect& srcRect, CompositeOperator, WebBlendMode, RespectImageOrientationEnum);
136 void drawTiled(GraphicsContext*, const FloatRect& dstRect, const FloatPoint& srcPoint, const FloatSize& tileSize,
137 CompositeOperator, WebBlendMode, const IntSize& repeatSpacing);
138 void drawTiled(GraphicsContext*, const FloatRect& dstRect, const FloatRect& srcRect, const FloatSize& tileScaleFactor, TileRule hRule, TileRule vRule, CompositeOperator);
140 // Supporting tiled drawing
141 virtual bool mayFillWithSolidColor() { return false; }
142 virtual Color solidColor() const { return Color(); }
145 RefPtr<SharedBuffer> m_encodedImageData;
146 ImageObserver* m_imageObserver;
149 #define DEFINE_IMAGE_TYPE_CASTS(typeName) \
150 DEFINE_TYPE_CASTS(typeName, Image, image, image->is##typeName(), image.is##typeName())