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1 /*
2  * Copyright (C) 2007 Apple 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 #include "config.h"
27 #include "DragImage.h"
28 
29 #if ENABLE(DRAG_SUPPORT)
30 #include "DragController.h"
31 
32 #include "Frame.h"
33 
34 namespace WebCore {
35 
fitDragImageToMaxSize(DragImageRef image,const IntSize & srcSize,const IntSize & size)36 DragImageRef fitDragImageToMaxSize(DragImageRef image, const IntSize& srcSize, const IntSize& size)
37 {
38     float heightResizeRatio = 0.0f;
39     float widthResizeRatio = 0.0f;
40     float resizeRatio = -1.0f;
41     IntSize originalSize = dragImageSize(image);
42 
43     if (srcSize.width() > size.width()) {
44         widthResizeRatio = size.width() / (float)srcSize.width();
45         resizeRatio = widthResizeRatio;
46     }
47 
48     if (srcSize.height() > size.height()) {
49         heightResizeRatio = size.height() / (float)srcSize.height();
50         if ((resizeRatio < 0.0f) || (resizeRatio > heightResizeRatio))
51             resizeRatio = heightResizeRatio;
52     }
53 
54     if (srcSize == originalSize)
55         return resizeRatio > 0.0f ? scaleDragImage(image, FloatSize(resizeRatio, resizeRatio)) : image;
56 
57     // The image was scaled in the webpage so at minimum we must account for that scaling
58     float scalex = srcSize.width() / (float)originalSize.width();
59     float scaley = srcSize.height() / (float)originalSize.height();
60     if (resizeRatio > 0.0f) {
61         scalex *= resizeRatio;
62         scaley *= resizeRatio;
63     }
64 
65     return scaleDragImage(image, FloatSize(scalex, scaley));
66 }
67 
createDragImageForSelection(Frame * frame)68 DragImageRef createDragImageForSelection(Frame* frame)
69 {
70     DragImageRef image = frame->dragImageForSelection();
71     if (image)
72         dissolveDragImageToFraction(image, DragController::DragImageAlpha);
73     return image;
74 }
75 
76 } // namespace WebCore
77 
78 #endif // ENABLE(DRAG_SUPPORT)
79