/*

 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

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

 * 2 along with this work; if not, write to the Free Software Foundation,

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

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package sun.java2d.opengl;

import java.awt.image.AffineTransformOp;

import java.awt.image.BufferedImage;

import java.awt.image.BufferedImageOp;

import java.awt.image.ConvolveOp;

import java.awt.image.LookupOp;

import java.awt.image.RescaleOp;

import sun.java2d.SunGraphics2D;

import sun.java2d.SurfaceData;

import sun.java2d.loops.CompositeType;

import sun.java2d.pipe.BufferedBufImgOps;

import static sun.java2d.opengl.OGLContext.OGLContextCaps.*;

class OGLBufImgOps extends BufferedBufImgOps {

    /**

     * This method is called from OGLDrawImage.transformImage() only.  It

     * validates the provided BufferedImageOp to determine whether the op

     * is one that can be accelerated by the OGL pipeline.  If the operation

     * cannot be completed for any reason, this method returns false;

     * otherwise, the given BufferedImage is rendered to the destination

     * using the provided BufferedImageOp and this method returns true.

     */

    static boolean renderImageWithOp(SunGraphics2D sg, BufferedImage img,

                                     BufferedImageOp biop, int x, int y)

    {

        // Validate the provided BufferedImage (make sure it is one that

        // is supported, and that its properties are acceleratable)

        if (biop instanceof ConvolveOp) {

            if (!isConvolveOpValid((ConvolveOp)biop)) {

                return false;

            }

        } else if (biop instanceof RescaleOp) {

            if (!isRescaleOpValid((RescaleOp)biop, img)) {

                return false;

            }

        } else if (biop instanceof LookupOp) {

            if (!isLookupOpValid((LookupOp)biop, img)) {

                return false;

            }

        } else {

            // No acceleration for other BufferedImageOps (yet)

            return false;

        }

        SurfaceData dstData = sg.surfaceData;

        if (!(dstData instanceof OGLSurfaceData) ||

            (sg.interpolationType == AffineTransformOp.TYPE_BICUBIC) ||

            (sg.compositeState > SunGraphics2D.COMP_ALPHA))

        {

            return false;

        }

        SurfaceData srcData =

            dstData.getSourceSurfaceData(img, SunGraphics2D.TRANSFORM_ISIDENT,

                                         CompositeType.SrcOver, null);

        if (!(srcData instanceof OGLSurfaceData)) {

            // REMIND: this hack tries to ensure that we have a cached texture

            srcData =

                dstData.getSourceSurfaceData(img, SunGraphics2D.TRANSFORM_ISIDENT,

                                             CompositeType.SrcOver, null);

            if (!(srcData instanceof OGLSurfaceData)) {

                return false;

            }

        }

        // Verify that the source surface is actually a texture and

        // that the operation is supported

        OGLSurfaceData oglSrc = (OGLSurfaceData)srcData;

        OGLGraphicsConfig gc = oglSrc.getOGLGraphicsConfig();

        if (oglSrc.getType() != OGLSurfaceData.TEXTURE ||

            !gc.isCapPresent(CAPS_EXT_BIOP_SHADER))

        {

            return false;

        }

        int sw = img.getWidth();

        int sh = img.getHeight();

        OGLBlitLoops.IsoBlit(srcData, dstData,

                             img, biop,

                             sg.composite, sg.getCompClip(),

                             sg.transform, sg.interpolationType,

                             0, 0, sw, sh,

                             x, y, x+sw, y+sh,

                             true);

        return true;

    }

}