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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 
     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 
     68 DragImageRef createDragImageForSelection(Frame* frame)
     69 {
     70     DragImageRef image = frame->dragImageForSelection();
     71     if (image)
     72         image = dissolveDragImageToFraction(image, DragController::DragImageAlpha);
     73     return image;
     74 }
     75 
     76 #if !PLATFORM(MAC) && (!PLATFORM(WIN) || OS(WINCE))
     77 DragImageRef createDragImageForLink(KURL&, const String&, Frame*)
     78 {
     79     return 0;
     80 }
     81 #endif
     82 
     83 } // namespace WebCore
     84 
     85 #endif // ENABLE(DRAG_SUPPORT)
     86