/* |
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* Copyright (c) 1999, 2010, 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.loops; |
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import java.awt.image.BufferedImage; |
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import java.awt.AlphaComposite; |
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import java.util.HashMap; |
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/** |
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* A CompositeType object provides a chained description of a type of |
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* algorithm for color compositing. The object will provide a single |
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* String constant descriptor which is one way of describing a particular |
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* compositing algorithm as well as a pointer to another CompositeType |
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* which describes a more general algorithm for achieving the same result. |
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* <p> |
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* A description of a more specific algorithm is considered a "subtype" |
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* and a description of a more general algorithm is considered a "supertype". |
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* Thus, the deriveSubType method provides a way to create a new CompositeType |
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* that is related to but more specific than an existing CompositeType and |
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* the getSuperType method provides a way to ask a given CompositeType |
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* for a more general algorithm to achieve the same result. |
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* <p> |
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* Note that you cannot construct a brand new root for a chain since |
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* the constructor is private. Every chain of types must at some point |
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* derive from the Any node provided here using the deriveSubType() |
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* method. The presence of this common Any node on every chain |
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* ensures that all chains end with the DESC_ANY descriptor so that |
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* a suitable General GraphicsPrimitive object can be obtained for |
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* the indicated algorithm if all of the more specific searches fail. |
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*/ |
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public final class CompositeType { |
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private static int unusedUID = 1; |
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private static final HashMap<String,Integer> compositeUIDMap = |
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new HashMap<String,Integer>(100); |
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/* |
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* CONSTANTS USED BY ALL PRIMITIVES TO DESCRIBE THE COMPOSITING |
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* ALGORITHMS THEY CAN PERFORM |
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*/ |
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/** |
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* algorithm is a general algorithm that uses a CompositeContext |
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* to do the rendering. |
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*/ |
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public static final String DESC_ANY = "Any CompositeContext"; |
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/** |
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* constant used to describe the Graphics.setXORMode() algorithm |
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*/ |
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public static final String DESC_XOR = "XOR mode"; |
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/** |
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* constants used to describe the various AlphaComposite |
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* algorithms. |
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*/ |
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public static final String DESC_CLEAR = "Porter-Duff Clear"; |
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public static final String DESC_SRC = "Porter-Duff Src"; |
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public static final String DESC_DST = "Porter-Duff Dst"; |
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public static final String DESC_SRC_OVER = "Porter-Duff Src Over Dst"; |
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public static final String DESC_DST_OVER = "Porter-Duff Dst Over Src"; |
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public static final String DESC_SRC_IN = "Porter-Duff Src In Dst"; |
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public static final String DESC_DST_IN = "Porter-Duff Dst In Src"; |
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public static final String DESC_SRC_OUT = "Porter-Duff Src HeldOutBy Dst"; |
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public static final String DESC_DST_OUT = "Porter-Duff Dst HeldOutBy Src"; |
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public static final String DESC_SRC_ATOP = "Porter-Duff Src Atop Dst"; |
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public static final String DESC_DST_ATOP = "Porter-Duff Dst Atop Src"; |
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public static final String DESC_ALPHA_XOR = "Porter-Duff Xor"; |
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/** |
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* constants used to describe the two common cases of |
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* AlphaComposite algorithms that are simpler if there |
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* is not extraAlpha. |
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*/ |
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public static final String |
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DESC_SRC_NO_EA = "Porter-Duff Src, No Extra Alpha"; |
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public static final String |
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DESC_SRC_OVER_NO_EA = "Porter-Duff SrcOverDst, No Extra Alpha"; |
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/** |
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* constant used to describe an algorithm that implements all 8 of |
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* the Porter-Duff rules in one Primitive. |
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*/ |
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public static final String DESC_ANY_ALPHA = "Any AlphaComposite Rule"; |
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/* |
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* END OF COMPOSITE ALGORITHM TYPE CONSTANTS |
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*/ |
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/** |
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* The root CompositeType object for all chains of algorithm descriptions. |
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*/ |
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public static final CompositeType |
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Any = new CompositeType(null, DESC_ANY); |
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/* |
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* START OF CompositeeType OBJECTS FOR THE VARIOUS CONSTANTS |
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*/ |
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public static final CompositeType |
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General = Any; |
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public static final CompositeType |
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AnyAlpha = General.deriveSubType(DESC_ANY_ALPHA); |
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public static final CompositeType |
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Xor = General.deriveSubType(DESC_XOR); |
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public static final CompositeType |
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Clear = AnyAlpha.deriveSubType(DESC_CLEAR); |
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public static final CompositeType |
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Src = AnyAlpha.deriveSubType(DESC_SRC); |
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public static final CompositeType |
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Dst = AnyAlpha.deriveSubType(DESC_DST); |
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public static final CompositeType |
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SrcOver = AnyAlpha.deriveSubType(DESC_SRC_OVER); |
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public static final CompositeType |
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DstOver = AnyAlpha.deriveSubType(DESC_DST_OVER); |
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public static final CompositeType |
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SrcIn = AnyAlpha.deriveSubType(DESC_SRC_IN); |
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public static final CompositeType |
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DstIn = AnyAlpha.deriveSubType(DESC_DST_IN); |
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public static final CompositeType |
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SrcOut = AnyAlpha.deriveSubType(DESC_SRC_OUT); |
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public static final CompositeType |
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DstOut = AnyAlpha.deriveSubType(DESC_DST_OUT); |
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public static final CompositeType |
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SrcAtop = AnyAlpha.deriveSubType(DESC_SRC_ATOP); |
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public static final CompositeType |
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DstAtop = AnyAlpha.deriveSubType(DESC_DST_ATOP); |
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public static final CompositeType |
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AlphaXor = AnyAlpha.deriveSubType(DESC_ALPHA_XOR); |
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public static final CompositeType |
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SrcNoEa = Src.deriveSubType(DESC_SRC_NO_EA); |
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public static final CompositeType |
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SrcOverNoEa = SrcOver.deriveSubType(DESC_SRC_OVER_NO_EA); |
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/* |
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* A special CompositeType for the case where we are filling in |
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* SrcOverNoEa mode with an opaque color. In that case then the |
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* best loop for us to use would be a SrcNoEa loop, but what if |
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* there is no such loop? In that case then we would end up |
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* backing off to a Src loop (which should still be fine) or an |
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* AnyAlpha loop which would be slower than a SrcOver loop in |
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* most cases. |
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* The fix is to use the following chain which looks for loops |
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* in the following order: |
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* SrcNoEa, Src, SrcOverNoEa, SrcOver, AnyAlpha |
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*/ |
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public static final CompositeType |
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OpaqueSrcOverNoEa = SrcOverNoEa.deriveSubType(DESC_SRC) |
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.deriveSubType(DESC_SRC_NO_EA); |
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/* |
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* END OF CompositeType OBJECTS FOR THE VARIOUS CONSTANTS |
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*/ |
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/** |
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* Return a new CompositeType object which uses this object as its |
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* more general "supertype" descriptor. If no operation can be |
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* found that implements the algorithm described more exactly |
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* by desc, then this object will define the more general |
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* compositing algorithm that can be used instead. |
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*/ |
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public CompositeType deriveSubType(String desc) { |
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return new CompositeType(this, desc); |
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} |
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/** |
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* Return a CompositeType object for the specified AlphaComposite |
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* rule. |
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*/ |
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public static CompositeType forAlphaComposite(AlphaComposite ac) { |
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switch (ac.getRule()) { |
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case AlphaComposite.CLEAR: |
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return Clear; |
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case AlphaComposite.SRC: |
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if (ac.getAlpha() >= 1.0f) { |
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return SrcNoEa; |
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} else { |
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return Src; |
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} |
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case AlphaComposite.DST: |
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return Dst; |
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case AlphaComposite.SRC_OVER: |
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if (ac.getAlpha() >= 1.0f) { |
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return SrcOverNoEa; |
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} else { |
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return SrcOver; |
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} |
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case AlphaComposite.DST_OVER: |
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return DstOver; |
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case AlphaComposite.SRC_IN: |
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return SrcIn; |
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case AlphaComposite.DST_IN: |
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return DstIn; |
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case AlphaComposite.SRC_OUT: |
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return SrcOut; |
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case AlphaComposite.DST_OUT: |
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return DstOut; |
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case AlphaComposite.SRC_ATOP: |
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return SrcAtop; |
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case AlphaComposite.DST_ATOP: |
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return DstAtop; |
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case AlphaComposite.XOR: |
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return AlphaXor; |
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default: |
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throw new InternalError("Unrecognized alpha rule"); |
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} |
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} |
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private int uniqueID; |
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private String desc; |
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private CompositeType next; |
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private CompositeType(CompositeType parent, String desc) { |
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next = parent; |
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this.desc = desc; |
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this.uniqueID = makeUniqueID(desc); |
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} |
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public synchronized static final int makeUniqueID(String desc) { |
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Integer i = compositeUIDMap.get(desc); |
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if (i == null) { |
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if (unusedUID > 255) { |
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throw new InternalError("composite type id overflow"); |
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} |
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i = unusedUID++; |
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compositeUIDMap.put(desc, i); |
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} |
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return i; |
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} |
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public int getUniqueID() { |
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return uniqueID; |
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} |
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public String getDescriptor() { |
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return desc; |
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} |
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public CompositeType getSuperType() { |
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return next; |
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} |
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public int hashCode() { |
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return desc.hashCode(); |
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} |
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public boolean isDerivedFrom(CompositeType other) { |
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CompositeType comptype = this; |
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do { |
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if (comptype.desc == other.desc) { |
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return true; |
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} |
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comptype = comptype.next; |
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} while (comptype != null); |
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return false; |
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} |
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public boolean equals(Object o) { |
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if (o instanceof CompositeType) { |
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return (((CompositeType) o).uniqueID == this.uniqueID); |
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} |
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return false; |
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} |
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public String toString() { |
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return desc; |
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} |
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} |