Examples with CopyOpImage com.sun.media.jai.opimage.CopyOpImage used on opensource projects

Example 1 with CopyOpImage

use of com.sun.media.jai.opimage.CopyOpImage in project imageio-ext by geosolutions-it.

the class TurboJpegImageWriter method refineImage.

/**
 * Performs a few check in order to make sure to provide the proper data bytes to the
 * incoming encoding phase. When calling getData(Rectangle).getDataBuffer() on an image having size
 * smaller than the tile size, the underlying data buffer will be made of the data contained in the
 * full tile (Even having used the getData(Rectangle) call. As an instance, a Rectangle(0,0,64,64)
 * extracted from a 64x64 image with tiling 128x128 will result into a ByteBuffer filled with
 * 128x128xBands bytes. (Therefore a lot of zeros). The encoded image will have a lot of scattered
 * black stripes.
 * This method do a copy of the only needed part of data when such a condition is met, or return the
 * original image otherwise.
 *
 * @param srcImage The source image to be refined.
 * @return
 */
private RenderedImage refineImage(RenderedImage srcImage) {
    final int w = srcImage.getWidth();
    final int h = srcImage.getHeight();
    final int minX = srcImage.getMinX();
    final int minY = srcImage.getMinY();
    final int tw = srcImage.getTileWidth();
    final int th = srcImage.getTileHeight();
    // portion of the original data
    if ((tw > w) || (th > h)) {
        RenderingHints hints = null;
        ImageLayout layout = null;
        if (srcImage instanceof RenderedOp) {
            hints = ((RenderedOp) srcImage).getRenderingHints();
            if ((hints != null) && hints.containsKey(JAI.KEY_IMAGE_LAYOUT)) {
                layout = (ImageLayout) hints.get(JAI.KEY_IMAGE_LAYOUT);
            } else {
                layout = new ImageLayout(srcImage);
            }
        } else {
            layout = new ImageLayout(srcImage);
            hints = new RenderingHints(JAI.KEY_IMAGE_LAYOUT, layout);
        }
        // Imposing the layout of the requested image
        // as well as reducing the tile layout which was
        // bigger than the image
        layout.setTileHeight(h);
        layout.setTileWidth(w);
        layout.setTileGridXOffset(minX);
        layout.setTileGridYOffset(minY);
        layout.setMinX(minX);
        layout.setMinY(minY);
        layout.setWidth(w);
        layout.setHeight(h);
        srcImage = new CopyOpImage(srcImage, hints, layout);
    }
    return srcImage;
}