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/*
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* Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.java2d.pipe;
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import java.awt.AlphaComposite;
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import java.awt.Composite;
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import sun.java2d.SurfaceData;
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import sun.java2d.loops.Blit;
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import sun.java2d.loops.CompositeType;
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import sun.java2d.loops.MaskBlit;
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import sun.java2d.loops.SurfaceType;
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import static sun.java2d.pipe.BufferedOpCodes.*;
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/**
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* The MaskBlit operation is expressed as:
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* dst = ((src <MODE> dst) * pathA) + (dst * (1 - pathA))
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*
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* The OGL/D3D implementation of the MaskBlit operation differs from the above
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* equation because it is not possible to perform such a complex operation in
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* OpenGL/Direct3D (without the use of advanced techniques like fragment
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* shaders and multitexturing). Therefore, the BufferedMaskBlit operation
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* is expressed as:
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* dst = (src * pathA) <SrcOver> dst
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*
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* This simplified formula is only equivalent to the "true" MaskBlit equation
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* in the following situations:
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* - <MODE> is SrcOver
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* - <MODE> is Src, extra alpha == 1.0, and the source surface is opaque
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*
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* Therefore, we register BufferedMaskBlit primitives for only the SurfaceType
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* and CompositeType restrictions mentioned above. In addition for the Src
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* case, we must override the composite with a SrcOver (no extra alpha)
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* instance, so that we set up the OpenGL/Direct3D blending mode to match the
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* BufferedMaskBlit equation.
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*/
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public abstract class BufferedMaskBlit extends MaskBlit {
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private static final int ST_INT_ARGB = 0;
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private static final int ST_INT_ARGB_PRE = 1;
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private static final int ST_INT_RGB = 2;
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private static final int ST_INT_BGR = 3;
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private final RenderQueue rq;
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private final int srcTypeVal;
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private Blit blitop;
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protected BufferedMaskBlit(RenderQueue rq,
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SurfaceType srcType,
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CompositeType compType,
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SurfaceType dstType)
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{
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super(srcType, compType, dstType);
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this.rq = rq;
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if (srcType == SurfaceType.IntArgb) {
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this.srcTypeVal = ST_INT_ARGB;
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} else if (srcType == SurfaceType.IntArgbPre) {
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this.srcTypeVal = ST_INT_ARGB_PRE;
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} else if (srcType == SurfaceType.IntRgb) {
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this.srcTypeVal = ST_INT_RGB;
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} else if (srcType == SurfaceType.IntBgr) {
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this.srcTypeVal = ST_INT_BGR;
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} else {
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throw new InternalError("unrecognized source surface type");
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}
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}
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@Override
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public void MaskBlit(SurfaceData src, SurfaceData dst,
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Composite comp, Region clip,
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int srcx, int srcy,
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int dstx, int dsty,
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int width, int height,
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byte[] mask, int maskoff, int maskscan)
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{
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if (width <= 0 || height <= 0) {
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return;
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}
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if (mask == null) {
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// no mask involved; delegate to regular blit loop
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if (blitop == null) {
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blitop = Blit.getFromCache(src.getSurfaceType(),
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CompositeType.AnyAlpha,
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this.getDestType());
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}
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blitop.Blit(src, dst,
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comp, clip,
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srcx, srcy, dstx, dsty,
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width, height);
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return;
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}
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AlphaComposite acomp = (AlphaComposite)comp;
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if (acomp.getRule() != AlphaComposite.SRC_OVER) {
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comp = AlphaComposite.SrcOver;
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}
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rq.lock();
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try {
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validateContext(dst, comp, clip);
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RenderBuffer buf = rq.getBuffer();
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int totalBytesRequired = 20 + (width * height * 4);
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/*
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* REMIND: we should fix this so that it works with tiles that
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* are larger than the entire buffer, but the native
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* OGL/D3DMaskBlit isn't even prepared for tiles larger
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* than 32x32 pixels, so there's no urgency here...
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*/
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rq.ensureCapacity(totalBytesRequired);
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// enqueue parameters and tile pixels
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int newpos = enqueueTile(buf.getAddress(), buf.position(),
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src, src.getNativeOps(), srcTypeVal,
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mask, mask.length, maskoff, maskscan,
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srcx, srcy, dstx, dsty,
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width, height);
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buf.position(newpos);
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} finally {
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rq.unlock();
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}
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}
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private native int enqueueTile(long buf, int bpos,
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SurfaceData srcData,
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long pSrcOps, int srcType,
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byte[] mask, int masklen,
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int maskoff, int maskscan,
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int srcx, int srcy, int dstx, int dsty,
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int width, int height);
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/**
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* Validates the context state using the given destination surface
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* and composite/clip values.
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*/
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protected abstract void validateContext(SurfaceData dstData,
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Composite comp, Region clip);
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}
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