| /* JPEGScan.java -- |
| Copyright (C) 2005 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| package gnu.javax.imageio.jpeg; |
| |
| import java.util.ArrayList; |
| |
| public class JPEGScan |
| { |
| private int maxHeight = 0, maxWidth = 0, maxV = 0, maxH = 0; |
| private int numOfComponents = 0, numOfComponentBlocks = 0; |
| private ArrayList components = new ArrayList(); |
| |
| public JPEGScan() |
| { |
| // Nothing to do here. |
| } |
| |
| public JPEGScan(int h, int w) |
| { |
| maxHeight=h; |
| maxWidth=w; |
| } |
| |
| private void recalculateDimensions() |
| { |
| JPEGComponent comp; |
| |
| // Compute the maximum H, maximum V factors defined in Annex A of the ISO |
| // DIS 10918-1. |
| for(int i=0; i < components.size() ; i++) |
| { |
| comp = (JPEGComponent)components.get(i); |
| if(comp.factorH > maxH) |
| maxH=comp.factorH; |
| if(comp.factorV > maxV) |
| maxV=comp.factorV; |
| } |
| |
| for(int i=0; i < components.size() ; i++) |
| { |
| comp = (JPEGComponent)components.get(i); |
| comp.maxH = maxH; |
| comp.maxV = maxV; |
| } |
| |
| } |
| |
| public void addComponent(byte id, byte factorHorizontal, byte factorVertical, |
| byte quantizationID) |
| { |
| JPEGComponent component = new JPEGComponent(id, factorHorizontal, factorVertical, quantizationID); |
| components.add((Object)component); |
| recalculateDimensions(); |
| numOfComponents++; |
| numOfComponentBlocks += factorHorizontal*factorVertical; |
| } |
| |
| public JPEGComponent getComponentByID(byte id) |
| { |
| JPEGComponent comp = (JPEGComponent)components.get(0); |
| for(int i=0; i < components.size() ; i++) |
| { |
| comp=(JPEGComponent)components.get(i); |
| if(comp.component_id==id) |
| break; |
| } |
| return(comp); |
| } |
| |
| public JPEGComponent get(int id) |
| { |
| return((JPEGComponent)components.get(id)); |
| } |
| |
| public int getX(byte id) |
| { |
| JPEGComponent comp = getComponentByID(id); |
| return(comp.width); |
| } |
| |
| public int getY(byte id) |
| { |
| JPEGComponent comp = getComponentByID(id); |
| return(comp.height); |
| } |
| |
| public int getMaxV() |
| { |
| return(maxV); |
| } |
| |
| public int getMaxH() |
| { |
| return(maxH); |
| } |
| |
| public void setWidth(int w) |
| { |
| maxWidth=w; |
| } |
| |
| public void setHeight(int h) |
| { |
| maxHeight=h; |
| } |
| |
| public int size() |
| { |
| return(numOfComponents); |
| } |
| |
| public int sizeComponentBlocks() |
| { |
| return(numOfComponentBlocks); |
| } |
| } |