Java example source code file (GeneralCompositePipe.java)

This example Java source code file (GeneralCompositePipe.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

awt, blit, bufferedimage, colormodel, compositecontext, generalcompositepipe, image, java2d, object, paintcontext, rectangle, renderinghints, shape, sungraphics2d, surfacedata, tilecontext, writableraster

The GeneralCompositePipe.java Java example source code

/*
 * Copyright (c) 1997, 2002, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package sun.java2d.pipe;

import java.awt.AlphaComposite;
import java.awt.CompositeContext;
import java.awt.PaintContext;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.RenderingHints;
import java.awt.image.ColorModel;
import java.awt.image.BufferedImage;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import sun.awt.image.BufImgSurfaceData;
import sun.java2d.SunGraphics2D;
import sun.java2d.SurfaceData;
import sun.java2d.loops.Blit;
import sun.java2d.loops.MaskBlit;
import sun.java2d.loops.CompositeType;

public class GeneralCompositePipe implements CompositePipe {
    class TileContext {
        SunGraphics2D sunG2D;
        PaintContext paintCtxt;
        CompositeContext compCtxt;
        ColorModel compModel;
        Object pipeState;

        public TileContext(SunGraphics2D sg, PaintContext pCtx,
                           CompositeContext cCtx, ColorModel cModel) {
            sunG2D = sg;
            paintCtxt = pCtx;
            compCtxt = cCtx;
            compModel = cModel;
        }
    }

    public Object startSequence(SunGraphics2D sg, Shape s, Rectangle devR,
                                int[] abox) {
        RenderingHints hints = sg.getRenderingHints();
        ColorModel model = sg.getDeviceColorModel();
        PaintContext paintContext =
            sg.paint.createContext(model, devR, s.getBounds2D(),
                                   sg.cloneTransform(),
                                   hints);
        CompositeContext compositeContext =
            sg.composite.createContext(paintContext.getColorModel(), model,
                                       hints);
        return new TileContext(sg, paintContext, compositeContext, model);
    }

    public boolean needTile(Object ctx, int x, int y, int w, int h) {
        return true;
    }

    /**
    * GeneralCompositePipe.renderPathTile works with custom composite operator
    * provided by an application
    */
    public void renderPathTile(Object ctx,
                               byte[] atile, int offset, int tilesize,
                               int x, int y, int w, int h) {
        TileContext context = (TileContext) ctx;
        PaintContext paintCtxt = context.paintCtxt;
        CompositeContext compCtxt = context.compCtxt;
        SunGraphics2D sg = context.sunG2D;

        Raster srcRaster = paintCtxt.getRaster(x, y, w, h);
        ColorModel paintModel = paintCtxt.getColorModel();

        Raster dstRaster;
        Raster dstIn;
        WritableRaster dstOut;

        SurfaceData sd = sg.getSurfaceData();
        dstRaster = sd.getRaster(x, y, w, h);
        if (dstRaster instanceof WritableRaster && atile == null) {
            dstOut = (WritableRaster) dstRaster;
            dstOut = dstOut.createWritableChild(x, y, w, h, 0, 0, null);
            dstIn = dstOut;
        } else {
            dstIn = dstRaster.createChild(x, y, w, h, 0, 0, null);
            dstOut = dstIn.createCompatibleWritableRaster();
        }

        compCtxt.compose(srcRaster, dstIn, dstOut);

        if (dstRaster != dstOut && dstOut.getParent() != dstRaster) {
            if (dstRaster instanceof WritableRaster && atile == null) {
                ((WritableRaster) dstRaster).setDataElements(x, y, dstOut);
            } else {
                ColorModel cm = sg.getDeviceColorModel();
                BufferedImage resImg =
                    new BufferedImage(cm, dstOut,
                                      cm.isAlphaPremultiplied(),
                                      null);
                SurfaceData resData = BufImgSurfaceData.createData(resImg);
                if (atile == null) {
                    Blit blit = Blit.getFromCache(resData.getSurfaceType(),
                                                  CompositeType.SrcNoEa,
                                                  sd.getSurfaceType());
                    blit.Blit(resData, sd, AlphaComposite.Src, null,
                              0, 0, x, y, w, h);
                } else {
                    MaskBlit blit = MaskBlit.getFromCache(resData.getSurfaceType(),
                                                          CompositeType.SrcNoEa,
                                                          sd.getSurfaceType());
                    blit.MaskBlit(resData, sd, AlphaComposite.Src, null,
                                  0, 0, x, y, w, h,
                                  atile, offset, tilesize);
                }
            }
        }
    }

    public void skipTile(Object ctx, int x, int y) {
        return;
    }

    public void endSequence(Object ctx) {
        TileContext context = (TileContext) ctx;
        if (context.paintCtxt != null) {
            context.paintCtxt.dispose();
        }
        if (context.compCtxt != null) {
            context.compCtxt.dispose();
        }
    }

}