| /* |
| * Copyright (c) 1999, 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.loops; |
| |
| import java.awt.image.BufferedImage; |
| import java.awt.AlphaComposite; |
| |
| /** |
| * A CompositeType object provides a chained description of a type of |
| * algorithm for color compositing. The object will provide a single |
| * String constant descriptor which is one way of describing a particular |
| * compositing algorithm as well as a pointer to another CompositeType |
| * which describes a more general algorithm for achieving the same result. |
| * <p> |
| * A description of a more specific algorithm is considered a "subtype" |
| * and a description of a more general algorithm is considered a "supertype". |
| * Thus, the deriveSubType method provides a way to create a new CompositeType |
| * that is related to but more specific than an existing CompositeType and |
| * the getSuperType method provides a way to ask a given CompositeType |
| * for a more general algorithm to achieve the same result. |
| * <p> |
| * Note that you cannot construct a brand new root for a chain since |
| * the constructor is private. Every chain of types must at some point |
| * derive from the Any node provided here using the deriveSubType() |
| * method. The presence of this common Any node on every chain |
| * ensures that all chains end with the DESC_ANY descriptor so that |
| * a suitable General GraphicsPrimitive object can be obtained for |
| * the indicated algorithm if all of the more specific searches fail. |
| */ |
| public final class CompositeType { |
| /* |
| * CONSTANTS USED BY ALL PRIMITIVES TO DESCRIBE THE COMPOSITING |
| * ALGORITHMS THEY CAN PERFORM |
| */ |
| |
| /** |
| * algorithm is a general algorithm that uses a CompositeContext |
| * to do the rendering. |
| */ |
| public static final String DESC_ANY = "Any CompositeContext"; |
| |
| /** |
| * constant used to describe the Graphics.setXORMode() algorithm |
| */ |
| public static final String DESC_XOR = "XOR mode"; |
| |
| /** |
| * constants used to describe the various AlphaComposite |
| * algorithms. |
| */ |
| public static final String DESC_CLEAR = "Porter-Duff Clear"; |
| public static final String DESC_SRC = "Porter-Duff Src"; |
| public static final String DESC_DST = "Porter-Duff Dst"; |
| public static final String DESC_SRC_OVER = "Porter-Duff Src Over Dst"; |
| public static final String DESC_DST_OVER = "Porter-Duff Dst Over Src"; |
| public static final String DESC_SRC_IN = "Porter-Duff Src In Dst"; |
| public static final String DESC_DST_IN = "Porter-Duff Dst In Src"; |
| public static final String DESC_SRC_OUT = "Porter-Duff Src HeldOutBy Dst"; |
| public static final String DESC_DST_OUT = "Porter-Duff Dst HeldOutBy Src"; |
| public static final String DESC_SRC_ATOP = "Porter-Duff Src Atop Dst"; |
| public static final String DESC_DST_ATOP = "Porter-Duff Dst Atop Src"; |
| public static final String DESC_ALPHA_XOR = "Porter-Duff Xor"; |
| |
| /** |
| * constants used to describe the two common cases of |
| * AlphaComposite algorithms that are simpler if there |
| * is not extraAlpha. |
| */ |
| public static final String |
| DESC_SRC_NO_EA = "Porter-Duff Src, No Extra Alpha"; |
| public static final String |
| DESC_SRC_OVER_NO_EA = "Porter-Duff SrcOverDst, No Extra Alpha"; |
| |
| /** |
| * constant used to describe an algorithm that implements all 8 of |
| * the Porter-Duff rules in one Primitive. |
| */ |
| public static final String DESC_ANY_ALPHA = "Any AlphaComposite Rule"; |
| |
| /* |
| * END OF COMPOSITE ALGORITHM TYPE CONSTANTS |
| */ |
| |
| /** |
| * The root CompositeType object for all chains of algorithm descriptions. |
| */ |
| public static final CompositeType |
| Any = new CompositeType(null, DESC_ANY); |
| |
| /* |
| * START OF CompositeeType OBJECTS FOR THE VARIOUS CONSTANTS |
| */ |
| |
| public static final CompositeType |
| General = Any; |
| |
| public static final CompositeType |
| AnyAlpha = General.deriveSubType(DESC_ANY_ALPHA); |
| public static final CompositeType |
| Xor = General.deriveSubType(DESC_XOR); |
| |
| public static final CompositeType |
| Clear = AnyAlpha.deriveSubType(DESC_CLEAR); |
| public static final CompositeType |
| Src = AnyAlpha.deriveSubType(DESC_SRC); |
| public static final CompositeType |
| Dst = AnyAlpha.deriveSubType(DESC_DST); |
| public static final CompositeType |
| SrcOver = AnyAlpha.deriveSubType(DESC_SRC_OVER); |
| public static final CompositeType |
| DstOver = AnyAlpha.deriveSubType(DESC_DST_OVER); |
| public static final CompositeType |
| SrcIn = AnyAlpha.deriveSubType(DESC_SRC_IN); |
| public static final CompositeType |
| DstIn = AnyAlpha.deriveSubType(DESC_DST_IN); |
| public static final CompositeType |
| SrcOut = AnyAlpha.deriveSubType(DESC_SRC_OUT); |
| public static final CompositeType |
| DstOut = AnyAlpha.deriveSubType(DESC_DST_OUT); |
| public static final CompositeType |
| SrcAtop = AnyAlpha.deriveSubType(DESC_SRC_ATOP); |
| public static final CompositeType |
| DstAtop = AnyAlpha.deriveSubType(DESC_DST_ATOP); |
| public static final CompositeType |
| AlphaXor = AnyAlpha.deriveSubType(DESC_ALPHA_XOR); |
| |
| public static final CompositeType |
| SrcNoEa = Src.deriveSubType(DESC_SRC_NO_EA); |
| public static final CompositeType |
| SrcOverNoEa = SrcOver.deriveSubType(DESC_SRC_OVER_NO_EA); |
| |
| /* |
| * END OF CompositeType OBJECTS FOR THE VARIOUS CONSTANTS |
| */ |
| |
| /** |
| * Return a new CompositeType object which uses this object as its |
| * more general "supertype" descriptor. If no operation can be |
| * found that implements the algorithm described more exactly |
| * by desc, then this object will define the more general |
| * compositing algorithm that can be used instead. |
| */ |
| public CompositeType deriveSubType(String desc) { |
| return new CompositeType(this, desc); |
| } |
| |
| /** |
| * Return a CompositeType object for the specified AlphaComposite |
| * rule. |
| */ |
| public static CompositeType forAlphaComposite(AlphaComposite ac) { |
| switch (ac.getRule()) { |
| case AlphaComposite.CLEAR: |
| return Clear; |
| case AlphaComposite.SRC: |
| if (ac.getAlpha() >= 1.0f) { |
| return SrcNoEa; |
| } else { |
| return Src; |
| } |
| case AlphaComposite.DST: |
| return Dst; |
| case AlphaComposite.SRC_OVER: |
| if (ac.getAlpha() >= 1.0f) { |
| return SrcOverNoEa; |
| } else { |
| return SrcOver; |
| } |
| case AlphaComposite.DST_OVER: |
| return DstOver; |
| case AlphaComposite.SRC_IN: |
| return SrcIn; |
| case AlphaComposite.DST_IN: |
| return DstIn; |
| case AlphaComposite.SRC_OUT: |
| return SrcOut; |
| case AlphaComposite.DST_OUT: |
| return DstOut; |
| case AlphaComposite.SRC_ATOP: |
| return SrcAtop; |
| case AlphaComposite.DST_ATOP: |
| return DstAtop; |
| case AlphaComposite.XOR: |
| return AlphaXor; |
| default: |
| throw new InternalError("Unrecognized alpha rule"); |
| } |
| } |
| |
| private static int unusedUID = 1; |
| private int uniqueID; |
| private String desc; |
| private CompositeType next; |
| |
| private CompositeType(CompositeType parent, String desc) { |
| next = parent; |
| this.desc = desc; |
| this.uniqueID = makeUniqueID(); |
| } |
| |
| private synchronized static final int makeUniqueID() { |
| if (unusedUID > 255) { |
| throw new InternalError("composite type id overflow"); |
| } |
| return unusedUID++; |
| } |
| |
| public int getUniqueID() { |
| return uniqueID; |
| } |
| |
| public String getDescriptor() { |
| return desc; |
| } |
| |
| public CompositeType getSuperType() { |
| return next; |
| } |
| |
| public int hashCode() { |
| return desc.hashCode(); |
| } |
| |
| public boolean isDerivedFrom(CompositeType other) { |
| CompositeType comptype = this; |
| do { |
| if (comptype.desc == other.desc) { |
| return true; |
| } |
| comptype = comptype.next; |
| } while (comptype != null); |
| return false; |
| } |
| |
| public boolean equals(Object o) { |
| if (o instanceof CompositeType) { |
| return (((CompositeType) o).uniqueID == this.uniqueID); |
| } |
| return false; |
| } |
| |
| public String toString() { |
| return desc; |
| } |
| } |
