132 lines
3.7 KiB
Java
132 lines
3.7 KiB
Java
//******************************************************************************
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//
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// File: fcTLChunk.java
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// Package: edu.rit.image.png
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// Unit: Class edu.rit.image.png.fcTLChunk
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//
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// This Java source file is copyright (C) 2013 by Alan Kaminsky. All rights
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// reserved. For further information, contact the author, Alan Kaminsky, at
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// ark@cs.rit.edu.
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//
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// This Java source file is part of the Parallel Java 2 Library ("PJ2"). PJ2 is
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// free software; you can redistribute it and/or modify it under the terms of
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// the GNU General Public License as published by the Free Software Foundation;
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// either version 3 of the License, or (at your option) any later version.
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//
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// PJ2 is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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//
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// A copy of the GNU General Public License is provided in the file gpl.txt. You
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// may also obtain a copy of the GNU General Public License on the World Wide
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// Web at http://www.gnu.org/licenses/gpl.html.
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//
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//******************************************************************************
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package edu.rit.image.png;
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import edu.rit.util.Packing;
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/**
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* Class fcTLChunk provides a frame control chunk stored in an APNG file.
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*
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* @author Alan Kaminsky
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* @version 28-Jun-2013
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*/
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public class fcTLChunk
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extends Chunk
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{
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// Exported constants.
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/**
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* Frame area dispose operation: None.
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*/
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public static final byte APNG_DISPOSE_OP_NONE = (byte) 0;
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/**
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* Frame area dispose operation: Clear output buffer to fully transparent
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* black.
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*/
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public static final byte APNG_DISPOSE_OP_BACKGROUND = (byte) 1;
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/**
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* Frame area dispose operation: Revert output buffer to previous contents.
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*/
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public static final byte APNG_DISPOSE_OP_PREVIOUS = (byte) 2;
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/**
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* Frame area blend operation: Frame overwrites output buffer.
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*/
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public static final byte APNG_BLEND_OP_SOURCE = (byte) 0;
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/**
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* Frame area blend operation: Frame composites onto output buffer.
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*/
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public static final byte APNG_BLEND_OP_OVER = (byte) 1;
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// Exported constructors.
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/**
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* Construct a new uninitialized fcTL chunk. This constructor is for use
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* only by object deserialization.
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*/
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public fcTLChunk()
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{
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super();
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}
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/**
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* Construct a new fcTL chunk.
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*
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* @param seqnum Chunk sequence number.
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* @param width Width of the frame.
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* @param height Height of the frame.
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* @param xOffset X position of the frame.
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* @param yOffset Y position of the frame.
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* @param delayNumer Frame delay numerator.
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* @param delayDenom Frame delay denominator.
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* @param disposeOp Frame area dispose operation.
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* @param blendOp Frame area blend operation.
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*/
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public fcTLChunk
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(int seqnum,
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int width,
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int height,
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int xOffset,
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int yOffset,
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short delayNumer,
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short delayDenom,
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byte disposeOp,
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byte blendOp)
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{
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super (0x6663544c, getData (seqnum, width, height, xOffset, yOffset,
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delayNumer, delayDenom, disposeOp, blendOp));
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}
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private static byte[] getData
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(int seqnum,
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int width,
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int height,
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int xOffset,
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int yOffset,
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short delayNumer,
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short delayDenom,
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byte disposeOp,
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byte blendOp)
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{
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byte[] data = new byte [26];
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Packing.unpackIntBigEndian (seqnum, data, 0);
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Packing.unpackIntBigEndian (width, data, 4);
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Packing.unpackIntBigEndian (height, data, 8);
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Packing.unpackIntBigEndian (xOffset, data, 12);
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Packing.unpackIntBigEndian (yOffset, data, 16);
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Packing.unpackShortBigEndian (delayNumer, data, 20);
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Packing.unpackShortBigEndian (delayDenom, data, 22);
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data[24] = disposeOp;
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data[25] = blendOp;
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return data;
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}
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}
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