/*
* 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
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*/
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);
}