/* * Copyright (c) 2007, 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.Composite;import sun.java2d.SurfaceData;import sun.java2d.loops.Blit;import sun.java2d.loops.CompositeType;import sun.java2d.loops.MaskBlit;import sun.java2d.loops.SurfaceType;import static sun.java2d.pipe.BufferedOpCodes.*; /** * The MaskBlit operation is expressed as: *   dst = ((src <MODE> dst) * pathA) + (dst * (1 - pathA)) * * The OGL/D3D implementation of the MaskBlit operation differs from the above * equation because it is not possible to perform such a complex operation in * OpenGL/Direct3D (without the use of advanced techniques like fragment * shaders and multitexturing).  Therefore, the BufferedMaskBlit operation * is expressed as: *   dst = (src * pathA) <SrcOver> dst * * This simplified formula is only equivalent to the "true" MaskBlit equation * in the following situations: *   - <MODE> is SrcOver *   - <MODE> is Src, extra alpha == 1.0, and the source surface is opaque * * Therefore, we register BufferedMaskBlit primitives for only the SurfaceType * and CompositeType restrictions mentioned above.  In addition for the Src * case, we must override the composite with a SrcOver (no extra alpha) * instance, so that we set up the OpenGL/Direct3D blending mode to match the * BufferedMaskBlit equation. */public abstract class BufferedMaskBlit extends MaskBlit {     private static final int ST_INT_ARGB     = 0;    private static final int ST_INT_ARGB_PRE = 1;    private static final int ST_INT_RGB      = 2;    private static final int ST_INT_BGR      = 3;     private final RenderQueue rq;    private final int srcTypeVal;    private Blit blitop;     protected BufferedMaskBlit(RenderQueue rq,                               SurfaceType srcType,                               CompositeType compType,                               SurfaceType dstType)    {        super(srcType, compType, dstType);        this.rq = rq;        if (srcType == SurfaceType.IntArgb) {            this.srcTypeVal = ST_INT_ARGB;        } else if (srcType == SurfaceType.IntArgbPre) {            this.srcTypeVal = ST_INT_ARGB_PRE;        } else if (srcType == SurfaceType.IntRgb) {            this.srcTypeVal = ST_INT_RGB;        } else if (srcType == SurfaceType.IntBgr) {            this.srcTypeVal = ST_INT_BGR;        } else {            throw new InternalError("unrecognized source surface type");        }    }     @Override    public void MaskBlit(SurfaceData src, SurfaceData dst,                         Composite comp, Region clip,                         int srcx, int srcy,                         int dstx, int dsty,                         int width, int height,                         byte[] mask, int maskoff, int maskscan)    {        if (width <= 0 || height <= 0) {            return;        }         if (mask == null) {            // no mask involved; delegate to regular blit loop            if (blitop == null) {                blitop = Blit.getFromCache(src.getSurfaceType(),                                           CompositeType.AnyAlpha,                                           this.getDestType());            }            blitop.Blit(src, dst,                        comp, clip,                        srcx, srcy, dstx, dsty,                        width, height);            return;        }         AlphaComposite acomp = (AlphaComposite)comp;        if (acomp.getRule() != AlphaComposite.SRC_OVER) {            comp = AlphaComposite.SrcOver;        }         rq.lock();        try {            validateContext(dst, comp, clip);             RenderBuffer buf = rq.getBuffer();            int totalBytesRequired = 20 + (width * height * 4);             /*             * REMIND: we should fix this so that it works with tiles that             *         are larger than the entire buffer, but the native             *         OGL/D3DMaskBlit isn't even prepared for tiles larger             *         than 32x32 pixels, so there's no urgency here...             */            rq.ensureCapacity(totalBytesRequired);             // enqueue parameters and tile pixels            int newpos = enqueueTile(buf.getAddress(), buf.position(),                                     src, src.getNativeOps(), srcTypeVal,                                     mask, mask.length, maskoff, maskscan,                                     srcx, srcy, dstx, dsty,                                     width, height);             buf.position(newpos);        } finally {            rq.unlock();        }    }     private native int enqueueTile(long buf, int bpos,                                   SurfaceData srcData,                                   long pSrcOps, int srcType,                                   byte[] mask, int masklen,                                   int maskoff, int maskscan,                                   int srcx, int srcy, int dstx, int dsty,                                   int width, int height);     /**     * Validates the context state using the given destination surface     * and composite/clip values.     */    protected abstract void validateContext(SurfaceData dstData,                                            Composite comp, Region clip);}