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      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 
     42 namespace WebCore {
     43 
     44 IntSize dragImageSize(DragImageRef image)
     45 {
     46     if (!image)
     47         return IntSize();
     48 
     49     return IntSize(image->width(), image->height());
     50 }
     51 
     52 void deleteDragImage(DragImageRef image)
     53 {
     54     delete image;
     55 }
     56 
     57 DragImageRef 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 
     71 DragImageRef 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 
     94 DragImageRef 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 
    108 DragImageRef createDragImageIconForCachedImage(CachedImage*)
    109 {
    110     notImplemented();
    111     return 0;
    112 }
    113 
    114 } // namespace WebCore
    115