Refactor WebCore::DragImage.

Source/core/platform/chromium/DragImageChromiumSkia.cpp

-/*
- * Copyright (c) 2008, 2009, Google Inc. All rights reserved.
- * 
- * 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
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- * 
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "config.h"
-#include "core/platform/DragImage.h"
-
-#include "SkBitmap.h"
-#include "SkCanvas.h"
-#include "SkMatrix.h"
-#include "core/platform/NotImplemented.h"
-#include "core/platform/graphics/BitmapImage.h"
-#include "core/platform/graphics/FloatRect.h"
-#include "core/platform/graphics/Image.h"
-#include "core/platform/graphics/skia/NativeImageSkia.h"
-#include "core/platform/graphics/transforms/AffineTransform.h"
-
-#include "skia/ext/image_operations.h"
-
-#include <wtf/RefPtr.h>
-
-namespace WebCore {
-
-IntSize dragImageSize(DragImageRef image)
-{
-    if (!image)
-        return IntSize();
-
-    return IntSize(image->bitmap->width(), image->bitmap->height());
-}
-
-void deleteDragImage(DragImageRef image)
-{
-    if (image)
-        delete image->bitmap;
-    delete image;
-}
-
-DragImageRef scaleDragImage(DragImageRef image, FloatSize scale)
-{
-    if (!image)
-        return 0;
-
-    int imageWidth = scale.width() * image->bitmap->width();
-    int imageHeight = scale.height() * image->bitmap->height();
-    SkBitmap* scaledImage = new SkBitmap(
-        skia::ImageOperations::Resize(*image->bitmap, skia::ImageOperations::RESIZE_LANCZOS3,
-                                      imageWidth, imageHeight));
-    delete image->bitmap;
-    image->bitmap = scaledImage;
-    return image;
-}
-
-DragImageRef dissolveDragImageToFraction(DragImageRef image, float fraction)
-{
-    if (!image)
-        return 0;
-
-    image->bitmap->setIsOpaque(false);
-    image->bitmap->lockPixels();
-
-    for (int row = 0; row < image->bitmap->height(); ++row) {
-        for (int column = 0; column < image->bitmap->width(); ++column) {
-            uint32_t* pixel = image->bitmap->getAddr32(column, row);
-            *pixel = SkPreMultiplyARGB(SkColorGetA(*pixel) * fraction,
-                                       SkColorGetR(*pixel),
-                                       SkColorGetG(*pixel),
-                                       SkColorGetB(*pixel));
-        }
-    }
-
-    image->bitmap->unlockPixels();
-
-    return image;
-}
-
-DragImageRef createDragImageFromImage(Image* image, RespectImageOrientationEnum shouldRespectImageOrientation)
-{
-    if (!image)
-        return 0;
-
-    RefPtr<NativeImageSkia> bitmap = image->nativeImageForCurrentFrame();
-    if (!bitmap)
-        return 0;
-
-    DragImageChromium* dragImageChromium = new DragImageChromium;
-    dragImageChromium->bitmap = new SkBitmap();
-    dragImageChromium->resolutionScale = bitmap->resolutionScale();
-
-    if (image->isBitmapImage()) {
-        ImageOrientation orientation = DefaultImageOrientation;
-        BitmapImage* bitmapImage = static_cast<BitmapImage*>(image);
-        IntSize sizeRespectingOrientation = bitmapImage->sizeRespectingOrientation();
-
-        if (shouldRespectImageOrientation == RespectImageOrientation)
-            orientation = bitmapImage->currentFrameOrientation();
-
-        if (orientation != DefaultImageOrientation) {
-            // Construct a correctly-rotated copy of the image to use as the drag image.
-            dragImageChromium->bitmap->setConfig(
-                SkBitmap::kARGB_8888_Config, sizeRespectingOrientation.width(), sizeRespectingOrientation.height());
-            dragImageChromium->bitmap->allocPixels();
-
-            FloatRect destRect(FloatPoint(), sizeRespectingOrientation);
-            SkCanvas canvas(*dragImageChromium->bitmap);
-
-            canvas.concat(orientation.transformFromDefault(sizeRespectingOrientation));
-
-            if (orientation.usesWidthAsHeight())
-                destRect = FloatRect(destRect.x(), destRect.y(), destRect.height(), destRect.width());
-
-            canvas.drawBitmapRect(bitmap->bitmap(), 0, destRect);
-            return dragImageChromium;
-        }
-    }
-
-    bitmap->bitmap().copyTo(dragImageChromium->bitmap, SkBitmap::kARGB_8888_Config);
-    return dragImageChromium;
-}
-
-DragImageRef createDragImageIconForCachedImage(CachedImage*)
-{
-    notImplemented();
-    return 0;
-}
-
-} // namespace WebCore