001/* RenderableImageProducer.java -- 002 Copyright (C) 2002, 2006 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038 039package java.awt.image.renderable; 040 041import java.awt.image.ColorModel; 042import java.awt.image.DataBuffer; 043import java.awt.image.ImageConsumer; 044import java.awt.image.ImageProducer; 045import java.awt.image.Raster; 046import java.awt.image.RenderedImage; 047import java.awt.image.SampleModel; 048import java.util.ArrayList; 049import java.util.Iterator; 050 051public class RenderableImageProducer implements ImageProducer, Runnable 052{ 053 private RenderableImage image; 054 private RenderContext context; 055 private ArrayList consumers = new ArrayList(); 056 057 public RenderableImageProducer(RenderableImage image, RenderContext context) 058 { 059 this.image = image; 060 this.context = context; 061 } 062 063 public void setRenderContext(RenderContext context) 064 { 065 this.context = context; 066 } 067 068 public void addConsumer(ImageConsumer consumer) 069 { 070 synchronized (consumers) 071 { 072 if (! consumers.contains(consumer)) 073 consumers.add(consumer); 074 } 075 } 076 077 public boolean isConsumer(ImageConsumer consumer) 078 { 079 synchronized (consumers) 080 { 081 return consumers.contains(consumer); 082 } 083 } 084 085 public void removeConsumer(ImageConsumer consumer) 086 { 087 synchronized (consumers) 088 { 089 consumers.remove(consumer); 090 } 091 } 092 093 public void startProduction(ImageConsumer consumer) 094 { 095 addConsumer(consumer); 096 Thread t = new Thread(this, "RenderableImageProducerWorker"); 097 t.start(); 098 } 099 100 public void requestTopDownLeftRightResend(ImageConsumer consumer) 101 { 102 // Do nothing. The contract says we can ignore this call, so we do. 103 } 104 105 public void run() 106 { 107 // This isn't ideal but it avoids fail-fast problems. 108 // Alternatively, we could clone 'consumers' here. 109 synchronized (consumers) 110 { 111 RenderedImage newImage; 112 if (context == null) 113 newImage = image.createDefaultRendering(); 114 else 115 newImage = image.createRendering(context); 116 Raster newData = newImage.getData(); 117 ColorModel colorModel = newImage.getColorModel(); 118 if (colorModel == null) 119 colorModel = ColorModel.getRGBdefault(); 120 SampleModel sampleModel = newData.getSampleModel(); 121 DataBuffer dataBuffer = newData.getDataBuffer(); 122 int width = newData.getWidth(); 123 int height = newData.getHeight(); 124 125 // Initialize the consumers. 126 Iterator it = consumers.iterator(); 127 while (it.hasNext()) 128 { 129 ImageConsumer target = (ImageConsumer) it.next(); 130 target.setHints(ImageConsumer.COMPLETESCANLINES 131 | ImageConsumer.SINGLEFRAME 132 | ImageConsumer.SINGLEPASS 133 | ImageConsumer.TOPDOWNLEFTRIGHT); 134 target.setDimensions(width, height); 135 } 136 137 // Work in scan-line order. 138 int[] newLine = new int[width]; 139 int[] bands = new int[sampleModel.getNumBands()]; 140 for (int y = 0; y < height; ++y) 141 { 142 for (int x = 0; x < width; ++x) 143 { 144 sampleModel.getPixel(x, y, bands, dataBuffer); 145 newLine[x] = colorModel.getDataElement(bands, 0); 146 } 147 148 // Tell the consumers about the new scan line. 149 it = consumers.iterator(); 150 while (it.hasNext()) 151 { 152 ImageConsumer target = (ImageConsumer) it.next(); 153 target.setPixels(0, y, width, 1, colorModel, newLine, 0, width); 154 } 155 } 156 157 // Tell the consumers that we're done. 158 it = consumers.iterator(); 159 while (it.hasNext()) 160 { 161 ImageConsumer target = (ImageConsumer) it.next(); 162 target.imageComplete(ImageConsumer.STATICIMAGEDONE); 163 } 164 } 165 } 166} // class RenderableImageProducer