/*

 * $Id$

 *

 * Copyright (C) 2003-2009 JNode.org

 *

 * This library is free software; you can redistribute it and/or modify it

 * under the terms of the GNU Lesser General Public License as published

 * by the Free Software Foundation; either version 2.1 of the License, or

 * (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful, but 

 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY

 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 

 * License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with this library; If not, write to the Free Software Foundation, Inc., 

 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 */

package org.jnode.vm;

import org.jnode.annotation.MagicPermission;

import org.vmmagic.unboxed.Address;

/**

 * The java implementation of {@link org.jnode.vm.VmMultiMediaSupport}.

 *

 * @author Ewout Prangsma (epr@users.sourceforge.net)

 */

@MagicPermission

final class VmJavaMultiMediaSupport extends VmMultiMediaSupport {

    /**

     * @see org.jnode.vm.VmMultiMediaSupport#setARGB32bpp(org.vmmagic.unboxed.Address, org.vmmagic.unboxed.Address, int)

     */

    public void setARGB32bpp(Address src, Address dst, int length) {

        for (int i = length; i > 0; i--) {

            final int c = src.loadInt();

            final int alpha = (c >>> 24) & 0xFF;

            if (alpha != 0) {

                final int d = dst.loadInt();

                final int c1 = c & 0xFF;

                final int c2 = (c >> 8) & 0xFF;

                final int c3 = (c >> 16) & 0xFF;

                final int d1 = d & 0xFF;

                final int d2 = (d >> 8) & 0xFF;

                final int d3 = (d >> 16) & 0xFF;

                final int r1 = (((alpha * (c1 - d1)) >> 8) + d1) & 0xFF;

                final int r2 = (((alpha * (c2 - d2)) >> 8) + d2) & 0xFF;

                final int r3 = (((alpha * (c3 - d3)) >> 8) + d3) & 0xFF;

                dst.store(r1 | (r2 << 8) | (r3 << 16));

            }

            src = src.add(4);

            dst = dst.add(4);

        }

    }

}