third_party/WebKit/Source/platform/graphics/ImageObserver.h

   1 /*
   2  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef ImageObserver_h
  27 #define ImageObserver_h
  28
  29 #include "platform/PlatformExport.h"
  30
  31 namespace blink {
  32
  33 class Image;
  34 class IntRect;
  35
  36 // Interface for notification about changes to an image, including decoding,
  37 // drawing, and animating.
  38 class PLATFORM_EXPORT ImageObserver {
  39 protected:
  40     virtual ~ImageObserver();
  41 public:
  42     virtual void decodedSizeChanged(const Image*, int delta) = 0;
  43     virtual void didDraw(const Image*) = 0;
  44
  45     virtual bool shouldPauseAnimation(const Image*) = 0;
  46     virtual void animationAdvanced(const Image*) = 0;
  47
  48     virtual void changedInRect(const Image*, const IntRect&) = 0;
  49 };
  50
  51 } // namespace blink
  52
  53 #endif