IntSize dragImageSize(DragImageRef image)
{
if (!image)
return IntSize();
return IntSize(image->width(), image->height());
}
DragImageRef scaleDragImage(DragImageRef image, FloatSize scale)
{
if (!image)
return 0;
int scaledWidth = image->width() * scale.width();
int scaledHeight = image->height() * scale.height();
*image = image->scaled(scaledWidth, scaledHeight);
return 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;
}