J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2007 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.java2d.pipe; |
| 27 | |
| 28 | import java.awt.AlphaComposite; |
| 29 | import java.awt.Composite; |
| 30 | import sun.java2d.SunGraphics2D; |
| 31 | import sun.java2d.SurfaceData; |
| 32 | import sun.java2d.loops.CompositeType; |
| 33 | import sun.java2d.loops.MaskFill; |
| 34 | import sun.java2d.loops.SurfaceType; |
| 35 | import static sun.java2d.pipe.BufferedOpCodes.*; |
| 36 | |
| 37 | /** |
| 38 | * The MaskFill operation is expressed as: |
| 39 | * dst = ((src <MODE> dst) * pathA) + (dst * (1 - pathA)) |
| 40 | * |
| 41 | * The OGL/D3D implementation of the MaskFill operation differs from the above |
| 42 | * equation because it is not possible to perform such a complex operation in |
| 43 | * OpenGL/Direct3D (without the use of advanced techniques like fragment |
| 44 | * shaders and multitexturing). Therefore, the BufferedMaskFill operation |
| 45 | * is expressed as: |
| 46 | * dst = (src * pathA) <SrcOver> dst |
| 47 | * |
| 48 | * This simplified formula is only equivalent to the "true" MaskFill equation |
| 49 | * in the following situations: |
| 50 | * - <MODE> is SrcOver |
| 51 | * - <MODE> is Src, extra alpha == 1.0, and the source paint is opaque |
| 52 | * |
| 53 | * Therefore, we register BufferedMaskFill primitives for only the SurfaceType |
| 54 | * and CompositeType restrictions mentioned above. In addition, for the |
| 55 | * SrcNoEa case we must override the incoming composite with a SrcOver (no |
| 56 | * extra alpha) instance, so that we set up the OpenGL/Direct3D blending |
| 57 | * mode to match the BufferedMaskFill equation. |
| 58 | */ |
| 59 | public abstract class BufferedMaskFill extends MaskFill { |
| 60 | |
| 61 | protected final RenderQueue rq; |
| 62 | |
| 63 | protected BufferedMaskFill(RenderQueue rq, |
| 64 | SurfaceType srcType, |
| 65 | CompositeType compType, |
| 66 | SurfaceType dstType) |
| 67 | { |
| 68 | super(srcType, compType, dstType); |
| 69 | this.rq = rq; |
| 70 | } |
| 71 | |
| 72 | @Override |
| 73 | public void MaskFill(SunGraphics2D sg2d, SurfaceData sData, |
| 74 | Composite comp, |
| 75 | final int x, final int y, final int w, final int h, |
| 76 | final byte[] mask, |
| 77 | final int maskoff, final int maskscan) |
| 78 | { |
| 79 | AlphaComposite acomp = (AlphaComposite)comp; |
| 80 | if (acomp.getRule() != AlphaComposite.SRC_OVER) { |
| 81 | comp = AlphaComposite.SrcOver; |
| 82 | } |
| 83 | |
| 84 | rq.lock(); |
| 85 | try { |
| 86 | validateContext(sg2d, comp, BufferedContext.USE_MASK); |
| 87 | |
| 88 | // we adjust the mask length so that the mask ends on a |
| 89 | // 4-byte boundary |
| 90 | int maskBytesRequired; |
| 91 | if (mask != null) { |
| 92 | // we adjust the mask length so that the mask ends on a |
| 93 | // 4-byte boundary |
| 94 | maskBytesRequired = (mask.length + 3) & (~3); |
| 95 | } else { |
| 96 | // mask not needed |
| 97 | maskBytesRequired = 0; |
| 98 | } |
| 99 | int totalBytesRequired = 32 + maskBytesRequired; |
| 100 | |
| 101 | RenderBuffer buf = rq.getBuffer(); |
| 102 | if (totalBytesRequired <= buf.capacity()) { |
| 103 | if (totalBytesRequired > buf.remaining()) { |
| 104 | // process the queue first and then enqueue the mask |
| 105 | rq.flushNow(); |
| 106 | } |
| 107 | |
| 108 | buf.putInt(MASK_FILL); |
| 109 | // enqueue parameters |
| 110 | buf.putInt(x).putInt(y).putInt(w).putInt(h); |
| 111 | buf.putInt(maskoff); |
| 112 | buf.putInt(maskscan); |
| 113 | buf.putInt(maskBytesRequired); |
| 114 | if (mask != null) { |
| 115 | // enqueue the mask |
| 116 | int padding = maskBytesRequired - mask.length; |
| 117 | buf.put(mask); |
| 118 | if (padding != 0) { |
| 119 | buf.position(buf.position() + padding); |
| 120 | } |
| 121 | } |
| 122 | } else { |
| 123 | // queue is too small to accomodate entire mask; perform |
| 124 | // the operation directly on the queue flushing thread |
| 125 | rq.flushAndInvokeNow(new Runnable() { |
| 126 | public void run() { |
| 127 | maskFill(x, y, w, h, |
| 128 | maskoff, maskscan, mask.length, mask); |
| 129 | } |
| 130 | }); |
| 131 | } |
| 132 | } finally { |
| 133 | rq.unlock(); |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | /** |
| 138 | * Called as a separate Runnable when the operation is too large to fit |
| 139 | * on the RenderQueue. The OGL/D3D pipelines each have their own (small) |
| 140 | * native implementation of this method. |
| 141 | */ |
| 142 | protected abstract void maskFill(int x, int y, int w, int h, |
| 143 | int maskoff, int maskscan, int masklen, |
| 144 | byte[] mask); |
| 145 | |
| 146 | /** |
| 147 | * Validates the state in the provided SunGraphics2D object and sets up |
| 148 | * any special resources for this operation (e.g. enabling gradient |
| 149 | * shading). |
| 150 | */ |
| 151 | protected abstract void validateContext(SunGraphics2D sg2d, |
| 152 | Composite comp, int ctxflags); |
| 153 | } |