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
41namespace WebCore {
42
43class CachedImage;
44class 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.
52class AsyncImageResizer : public CachedResourceClient, public RefCounted<AsyncImageResizer> {
53public:
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
88private:
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