Moving GraphicsContext and dependencies from core to platform.

Source/core/platform/graphics/ImageSource.h

-/*
- * 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 ImageSource_h
-#define ImageSource_h
-
-#include "platform/graphics/ImageOrientation.h"
-#include "wtf/Forward.h"
-#include "wtf/Noncopyable.h"
-#include "wtf/OwnPtr.h"
-#include "wtf/Vector.h"
-
-namespace WebCore {
-
-class DeferredImageDecoder;
-class ImageOrientation;
-class IntPoint;
-class IntSize;
-class NativeImageSkia;
-class SharedBuffer;
-
-// Right now GIFs are the only recognized image format that supports animation.
-// The animation system and the constants below are designed with this in mind.
-// GIFs have an optional 16-bit unsigned loop count that describes how an
-// animated GIF should be cycled.  If the loop count is absent, the animation
-// cycles once; if it is 0, the animation cycles infinitely; otherwise the
-// animation plays n + 1 cycles (where n is the specified loop count).  If the
-// GIF decoder defaults to cAnimationLoopOnce in the absence of any loop count
-// and translates an explicit "0" loop count to cAnimationLoopInfinite, then we
-// get a couple of nice side effects:
-//   * By making cAnimationLoopOnce be 0, we allow the animation cycling code in
-//     BitmapImage.cpp to avoid special-casing it, and simply treat all
-//     non-negative loop counts identically.
-//   * By making the other two constants negative, we avoid conflicts with any
-//     real loop count values.
-const int cAnimationLoopOnce = 0;
-const int cAnimationLoopInfinite = -1;
-const int cAnimationNone = -2;
-
-class ImageSource {
-    WTF_MAKE_NONCOPYABLE(ImageSource);
-public:
-    enum AlphaOption {
-        AlphaPremultiplied,
-        AlphaNotPremultiplied
-    };
-
-    enum GammaAndColorProfileOption {
-        GammaAndColorProfileApplied,
-        GammaAndColorProfileIgnored
-    };
-
-    ImageSource(AlphaOption alphaOption = AlphaPremultiplied, GammaAndColorProfileOption gammaAndColorProfileOption = GammaAndColorProfileApplied);
-    ~ImageSource();
-
-    // Tells the ImageSource that the Image no longer cares about decoded frame
-    // data except for the specified frame. Callers may pass WTF::kNotFound to
-    // clear all frames.
-    //
-    // In response, the ImageSource should delete cached decoded data for other
-    // frames where possible to keep memory use low. The expectation is that in
-    // the future, the caller may call createFrameAtIndex() with an index larger
-    // than the one passed to this function, and the implementation may then
-    // make use of the preserved frame data here in decoding that frame.
-    // By contrast, callers who call this function and then later ask for an
-    // earlier frame may require more work to be done, e.g. redecoding the image
-    // from the beginning.
-    //
-    // Implementations may elect to preserve more frames than the one requested
-    // here if doing so is likely to save CPU time in the future, but will pay
-    // an increased memory cost to do so.
-    //
-    // Returns the number of bytes of frame data actually cleared.
-    size_t clearCacheExceptFrame(size_t);
-
-    bool initialized() const;
-
-    void setData(SharedBuffer* data, bool allDataReceived);
-    String filenameExtension() const;
-
-    bool isSizeAvailable();
-    IntSize size(RespectImageOrientationEnum = DoNotRespectImageOrientation) const;
-    IntSize frameSizeAtIndex(size_t, RespectImageOrientationEnum = DoNotRespectImageOrientation) const;
-
-    bool getHotSpot(IntPoint&) const;
-
-    int repetitionCount();
-
-    size_t frameCount() const;
-
-    PassRefPtr<NativeImageSkia> createFrameAtIndex(size_t);
-
-    float frameDurationAtIndex(size_t) const;
-    bool frameHasAlphaAtIndex(size_t) const; // Whether or not the frame actually used any alpha.
-    bool frameIsCompleteAtIndex(size_t) const; // Whether or not the frame is fully received.
-    ImageOrientation orientationAtIndex(size_t) const; // EXIF image orientation
-
-    // Return the number of bytes in the decoded frame. If the frame is not yet
-    // decoded then return 0.
-    unsigned frameBytesAtIndex(size_t) const;
-
-private:
-    OwnPtr<DeferredImageDecoder> m_decoder;
-
-    AlphaOption m_alphaOption;
-    GammaAndColorProfileOption m_gammaAndColorProfileOption;
-};
-
-}
-
-#endif