/*
 * 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.
/**
     * 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;
    }
}