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      1 /*
      2  * Copyright (C) 2010 Google 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 are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef AsyncImageResizer_h
     32 #define AsyncImageResizer_h
     33 
     34 #if ENABLE(IMAGE_RESIZER)
     35 
     36 #include "Blob.h"
     37 #include "CachedResourceClient.h"
     38 #include "IntSize.h"
     39 #include "ScriptValue.h"
     40 
     41 namespace WebCore {
     42 
     43 class CachedImage;
     44 class ImageResizerThread;
     45 
     46 // AsyncImageResizer waits for the CachedImage that is passed in to load completely,
     47 // then starts an ImageResizerThread to resize the image. Once created, ImageResizerThread
     48 // becomes in charge of its own lifetime and that of AsyncImageResizer. After the callbacks
     49 // occur, both objects are destroyed. If the document is destroyed during resizing,
     50 // AsyncImageResizer will receive a notification and subsequently block the callbacks from
     51 // occurring.
     52 class AsyncImageResizer : public CachedResourceClient, public RefCounted<AsyncImageResizer> {
     53 public:
     54     struct CallbackInfo {
     55         CallbackInfo(PassRefPtr<AsyncImageResizer> asyncImageResizer)
     56             : asyncImageResizer(asyncImageResizer)
     57             , blob(0)
     58         {
     59         }
     60 
     61         RefPtr<AsyncImageResizer> asyncImageResizer;
     62         RefPtr<Blob> blob;
     63     };
     64 
     65     enum OutputType {
     66         JPEG,
     67         PNG
     68     };
     69 
     70     enum AspectRatioOption {
     71         PreserveAspectRatio,
     72         IgnoreAspectRatio
     73     };
     74 
     75     enum OrientationOption {
     76         CorrectOrientation,
     77         IgnoreOrientation
     78     };
     79 
     80     static PassRefPtr<AsyncImageResizer> create(CachedImage*, OutputType, IntSize desiredBounds, ScriptValue successCallback, ScriptValue errorCallback, float quality, AspectRatioOption, OrientationOption);
     81     ~AsyncImageResizer();
     82 
     83     // FIXME: Insert override function for notification of document destruction (change m_callbacksOk).
     84 
     85     void resizeComplete(RefPtr<Blob>) { /* FIXME: Not yet implemented. */ }
     86     void resizeError() { /* FIXME: Not yet implemented. */ }
     87 
     88 private:
     89     AsyncImageResizer(CachedImage*, OutputType, IntSize desiredBounds, ScriptValue successCallback, ScriptValue errorCallback, float quality, AspectRatioOption, OrientationOption);
     90     virtual void notifyFinished(CachedResource*);
     91 
     92     CachedImage* m_cachedImage;
     93     ScriptValue m_successCallback;
     94     ScriptValue m_errorCallback;
     95 
     96     // Parameters to pass into ImageResizerThread.
     97     OutputType m_outputType;
     98     IntSize m_desiredBounds;
     99     float m_quality;
    100     AspectRatioOption m_aspectRatioOption;
    101     OrientationOption m_orientationOption;
    102 };
    103 
    104 } // namespace WebCore
    105 
    106 #endif // ENABLE(IMAGE_RESIZER)
    107 
    108 #endif // AsyncImageResizer_h
    109