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         dissolveDragImageToFraction(image, DragController::DragImageAlpha);

    73     return image;

    74 }

    75 

    76 } // namespace WebCore

    77 

    78 #endif // ENABLE(DRAG_SUPPORT)