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/*
* Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
* Copyright (C) 2004, 2005, 2006 Apple Computer, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef Image_h
#define Image_h
#include "platform/PlatformExport.h"
#include "platform/geometry/IntRect.h"
#include "platform/graphics/Color.h"
#include "platform/graphics/GraphicsTypes.h"
#include "platform/graphics/ImageOrientation.h"
#include "platform/graphics/skia/NativeImageSkia.h"
#include "third_party/skia/include/core/SkXfermode.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefCounted.h"
#include "wtf/RefPtr.h"
#include "wtf/RetainPtr.h"
#include "wtf/text/WTFString.h"
namespace WebCore {
class FloatPoint;
class FloatRect;
class FloatSize;
class GraphicsContext;
class Length;
class SharedBuffer;
// This class gets notified when an image creates or destroys decoded frames and when it advances animation frames.
class ImageObserver;
class PLATFORM_EXPORT Image : public RefCounted<Image> {
friend class GeneratedImage;
friend class CrossfadeGeneratedImage;
friend class GradientGeneratedImage;
friend class GraphicsContext;
public:
virtual ~Image();
static PassRefPtr<Image> loadPlatformResource(const char* name);
static bool supportsType(const String&);
virtual bool isSVGImage() const { return false; }
virtual bool isBitmapImage() const { return false; }
virtual bool currentFrameKnownToBeOpaque() = 0;
// Derived classes should override this if they can assure that the current
// image frame contains only resources from its own security origin.
virtual bool currentFrameHasSingleSecurityOrigin() const { return false; }
static Image* nullImage();
bool isNull() const { return size().isEmpty(); }
virtual void setContainerSize(const IntSize&) { }
virtual bool usesContainerSize() const { return false; }
virtual bool hasRelativeWidth() const { return false; }
virtual bool hasRelativeHeight() const { return false; }
virtual void computeIntrinsicDimensions(Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio);
virtual IntSize size() const = 0;
IntRect rect() const { return IntRect(IntPoint(), size()); }
int width() const { return size().width(); }
int height() const { return size().height(); }
virtual bool getHotSpot(IntPoint&) const { return false; }
bool setData(PassRefPtr<SharedBuffer> data, bool allDataReceived);
virtual bool dataChanged(bool /*allDataReceived*/) { return false; }
virtual String filenameExtension() const { return String(); } // null string if unknown
virtual void destroyDecodedData(bool destroyAll) = 0;
SharedBuffer* data() { return m_encodedImageData.get(); }
// Animation begins whenever someone draws the image, so startAnimation() is not normally called.
// It will automatically pause once all observers no longer want to render the image anywhere.
virtual void startAnimation(bool /*catchUpIfNecessary*/ = true) { }
virtual void stopAnimation() {}
virtual void resetAnimation() {}
// Typically the ImageResource that owns us.
ImageObserver* imageObserver() const { return m_imageObserver; }
void setImageObserver(ImageObserver* observer) { m_imageObserver = observer; }
enum TileRule { StretchTile, RoundTile, SpaceTile, RepeatTile };
virtual PassRefPtr<NativeImageSkia> nativeImageForCurrentFrame() { return 0; }
virtual void drawPattern(GraphicsContext*, const FloatRect&,
const FloatSize&, const FloatPoint& phase, CompositeOperator,
const FloatRect&, blink::WebBlendMode = blink::WebBlendModeNormal, const IntSize& repeatSpacing = IntSize());
#if !ASSERT_DISABLED
virtual bool notSolidColor() { return true; }
#endif
protected:
Image(ImageObserver* = 0);
static void fillWithSolidColor(GraphicsContext*, const FloatRect& dstRect, const Color&, CompositeOperator);
static FloatRect adjustForNegativeSize(const FloatRect&); // A helper method for translating negative width and height values.
virtual void draw(GraphicsContext*, const FloatRect& dstRect, const FloatRect& srcRect, CompositeOperator, blink::WebBlendMode) = 0;
virtual void draw(GraphicsContext*, const FloatRect& dstRect, const FloatRect& srcRect, CompositeOperator, blink::WebBlendMode, RespectImageOrientationEnum);
void drawTiled(GraphicsContext*, const FloatRect& dstRect, const FloatPoint& srcPoint, const FloatSize& tileSize,
CompositeOperator, blink::WebBlendMode, const IntSize& repeatSpacing);
void drawTiled(GraphicsContext*, const FloatRect& dstRect, const FloatRect& srcRect, const FloatSize& tileScaleFactor, TileRule hRule, TileRule vRule, CompositeOperator);
// Supporting tiled drawing
virtual bool mayFillWithSolidColor() { return false; }
virtual Color solidColor() const { return Color(); }
private:
RefPtr<SharedBuffer> m_encodedImageData;
ImageObserver* m_imageObserver;
};
#define DEFINE_IMAGE_TYPE_CASTS(typeName) \
DEFINE_TYPE_CASTS(typeName, Image, image, image->is##typeName(), image.is##typeName())
}
#endif
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