1/*
2 * Copyright (c) 2008, 2009, 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#include "config.h"
32#include "DragImage.h"
33
34#include "Image.h"
35#include "NativeImageSkia.h"
36#include "NotImplemented.h"
37#include "RefPtr.h"
38#include "SkBitmap.h"
39
40#include "skia/ext/image_operations.h"
41
42namespace WebCore {
43
44IntSize dragImageSize(DragImageRef image)
45{
46    if (!image)
47        return IntSize();
48
49    return IntSize(image->width(), image->height());
50}
51
52void deleteDragImage(DragImageRef image)
53{
54    delete image;
55}
56
57DragImageRef scaleDragImage(DragImageRef image, FloatSize scale)
58{
59    if (!image)
60        return 0;
61
62    int imageWidth = scale.width() * image->width();
63    int imageHeight = scale.height() * image->height();
64    DragImageRef scaledImage = new SkBitmap(
65        skia::ImageOperations::Resize(*image, skia::ImageOperations::RESIZE_LANCZOS3,
66                                      imageWidth, imageHeight));
67    delete image;
68    return scaledImage;
69}
70
71DragImageRef dissolveDragImageToFraction(DragImageRef image, float fraction)
72{
73    if (!image)
74        return 0;
75
76    image->setIsOpaque(false);
77    image->lockPixels();
78
79    for (int row = 0; row < image->height(); ++row) {
80        for (int column = 0; column < image->width(); ++column) {
81            uint32_t* pixel = image->getAddr32(column, row);
82            *pixel = SkPreMultiplyARGB(SkColorGetA(*pixel) * fraction,
83                                       SkColorGetR(*pixel),
84                                       SkColorGetG(*pixel),
85                                       SkColorGetB(*pixel));
86        }
87    }
88
89    image->unlockPixels();
90
91    return image;
92}
93
94DragImageRef createDragImageFromImage(Image* image)
95{
96    if (!image)
97        return 0;
98
99    NativeImageSkia* bitmap = image->nativeImageForCurrentFrame();
100    if (!bitmap)
101        return 0;
102
103    SkBitmap* dragImage = new SkBitmap();
104    bitmap->copyTo(dragImage, SkBitmap::kARGB_8888_Config);
105    return dragImage;
106}
107
108DragImageRef createDragImageIconForCachedImage(CachedImage*)
109{
110    notImplemented();
111    return 0;
112}
113
114} // namespace WebCore
115