Source/WebCore/platform/chromium/DragImageChromiumSkia.cpp

/*
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 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
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 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 */

#include "config.h"
#include "DragImage.h"

#include "Image.h"
#include "NativeImageSkia.h"
#include "NotImplemented.h"
#include "RefPtr.h"
#include "SkBitmap.h"

#include "skia/ext/image_operations.h"

namespace WebCore {

IntSize dragImageSize(DragImageRef image)
{
    if (!image)
        return IntSize();

    return IntSize(image->width(), image->height());
}

void deleteDragImage(DragImageRef image)
{
    delete image;
}

DragImageRef scaleDragImage(DragImageRef image, FloatSize scale)
{
    if (!image)
        return 0;

    int imageWidth = scale.width() * image->width();
    int imageHeight = scale.height() * image->height();
    DragImageRef scaledImage = new SkBitmap(
        skia::ImageOperations::Resize(*image, skia::ImageOperations::RESIZE_LANCZOS3,
                                      imageWidth, imageHeight));
    delete image;
    return scaledImage;
}

DragImageRef dissolveDragImageToFraction(DragImageRef image, float fraction)
{
    if (!image)
        return 0;

    image->setIsOpaque(false);
    image->lockPixels();

    for (int row = 0; row < image->height(); ++row) {
        for (int column = 0; column < image->width(); ++column) {
            uint32_t* pixel = image->getAddr32(column, row);
            *pixel = SkPreMultiplyARGB(SkColorGetA(*pixel) * fraction,
                                       SkColorGetR(*pixel),
                                       SkColorGetG(*pixel),
                                       SkColorGetB(*pixel));
        }
    }

    image->unlockPixels();

    return image;
}

DragImageRef createDragImageFromImage(Image* image)
{
    if (!image)
        return 0;

    NativeImageSkia* bitmap = image->nativeImageForCurrentFrame();
    if (!bitmap)
        return 0;

    SkBitmap* dragImage = new SkBitmap();
    bitmap->bitmap().copyTo(dragImage, SkBitmap::kARGB_8888_Config);
    return dragImage;
}

DragImageRef createDragImageIconForCachedImage(CachedImage*)
{
    notImplemented();
    return 0;
}

} // namespace WebCore