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1: /* DecodeBF16.java -- 2: Copyright (C) 2005 Free Software Foundation, Inc. 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: package gnu.javax.imageio.bmp; 39: 40: import java.io.IOException; 41: import javax.imageio.stream.ImageInputStream; 42: import java.nio.ByteBuffer; 43: import java.nio.ByteOrder; 44: import java.awt.image.BufferedImage; 45: import java.awt.image.ColorModel; 46: import java.awt.image.DirectColorModel; 47: import java.awt.image.Raster; 48: import java.awt.image.WritableRaster; 49: import java.awt.image.DataBuffer; 50: import java.awt.image.DataBufferUShort; 51: import java.awt.image.SinglePixelPackedSampleModel; 52: import java.awt.image.SampleModel; 53: import java.awt.Dimension; 54: 55: public class DecodeBF16 extends BMPDecoder { 56: private int[] bitmasks; 57: private boolean useDefaultMasks; 58: 59: public DecodeBF16(BMPFileHeader fh, BMPInfoHeader ih, 60: boolean udm){ 61: super(fh,ih); 62: 63: useDefaultMasks = udm; 64: if(useDefaultMasks) // 5-6-5 mask, B,G,R 65: bitmasks = new int[] { 0x00F800, 0x0007E0, 0x00001F }; 66: } 67: 68: public BufferedImage decode(ImageInputStream in) throws IOException, BMPException { 69: if(!useDefaultMasks) 70: bitmasks = readBitMasks(in); 71: skipToImage(in); 72: 73: Dimension d = infoHeader.getSize(); 74: int h = (int)d.getHeight(); 75: int w = (int)d.getWidth(); 76: 77: // BMP scanlines are padded to dword offsets 78: int scansize = (w + (w&1)) << 1; 79: short[] data = new short[w*h]; 80: 81: for(int y=h-1;y>=0;y--){ 82: byte[] scanline = new byte[scansize]; 83: if(in.read(scanline) != scansize) 84: throw new IOException("Couldn't read image data."); 85: 86: for(int x=0;x<w;x++) 87: data[x + y*w] = (short)((scanline[x*2] & (0xFF)) | 88: ((scanline[x*2+1] & (0xFF)) << 8)); 89: } 90: 91: ColorModel cm = new DirectColorModel(16, 92: bitmasks[0], bitmasks[1], bitmasks[2]); 93: SampleModel sm = new SinglePixelPackedSampleModel(DataBuffer.TYPE_USHORT, 94: w, h, 95: bitmasks); 96: DataBuffer db = new DataBufferUShort(data, w*h, 0); 97: WritableRaster raster = Raster.createWritableRaster(sm, db, null); 98: return new BufferedImage(cm, raster, false, null); 99: } 100: 101: } 102: 103: