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Diffstat (limited to 'libjava/classpath/gnu/javax/imageio/bmp/BMPInfoHeader.java')
| -rw-r--r-- | libjava/classpath/gnu/javax/imageio/bmp/BMPInfoHeader.java | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/javax/imageio/bmp/BMPInfoHeader.java b/libjava/classpath/gnu/javax/imageio/bmp/BMPInfoHeader.java new file mode 100644 index 00000000000..edcb4e644cc --- /dev/null +++ b/libjava/classpath/gnu/javax/imageio/bmp/BMPInfoHeader.java @@ -0,0 +1,201 @@ +/* BMPInfoHeader.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.bmp; + +import java.io.IOException; +import javax.imageio.stream.ImageInputStream; +import java.io.OutputStream; +import java.nio.ByteBuffer; +import java.nio.ByteOrder; +import java.awt.Dimension; + +public class BMPInfoHeader { + /** Size of the bitmap info header*/ + private int biSize; + + /** Pixel width of the bitmap */ + private int biWidth; + + /** Pixel height of the bitmap */ + private int biHeight; + + /** Number of bitplanes = 1 */ + private short biPlanes; + + /** Number of bpp = 1,4,8,24 */ + private short biBitCount; + + /** Compression type, RGB8, RLE8, RLE4, BITFIELDS */ + private int biCompression; + + /** Byte size of the uncompressed bitmap, can be 0. */ + private int biSizeImage; + + /** X resolution, dots per meter */ + private int biXPelsPerMeter; + + /** Y resolution, dots per meter */ + private int biYPelsPerMeter; + + /** Number of colors used (palette only, can be 0 for all) */ + private int biClrUsed; + + /** Number of 'important' colors, 0 for all */ + private int biClrImportant; + + /** BITMAPINFOHEADER is 40 bytes */ + public static final int SIZE = 40; + + /** + * Compression types + */ + public static final int BI_RGB = 0; + public static final int BI_RLE8 = 1; + public static final int BI_RLE4 = 2; + public static final int BI_BITFIELDS = 3; + + /** + * Creates the header from an input stream, which is not closed. + * @throws IOException if an I/O error occured. + * @throws BMPException if the header was invalid + */ + public BMPInfoHeader(ImageInputStream in) throws IOException, BMPException { + byte[] data = new byte[SIZE]; + + if (in.read(data) != SIZE) + throw new IOException("Couldn't read header."); + ByteBuffer buf = ByteBuffer.wrap(data); + buf.order(ByteOrder.LITTLE_ENDIAN); + + int n; + if((n=buf.getInt()) != SIZE) + throw new BMPException("Invalid BITMAPINFOHEADER size: "+n); + + biWidth = buf.getInt(); + biHeight = buf.getInt(); + biPlanes = buf.getShort(); + setBitCount(buf.getShort()); + setCompression(buf.getInt()); + biSizeImage = buf.getInt(); + biXPelsPerMeter = buf.getInt(); + biYPelsPerMeter = buf.getInt(); + biClrUsed = buf.getInt(); + biClrImportant = buf.getInt(); + } + + public void setBitCount(short bitcount) throws BMPException { + switch(bitcount){ + case 1: + case 4: + case 8: + case 16: + case 24: + case 32: + biBitCount = bitcount; + break; + + default: + throw new BMPException("Invalid number of bits per pixel: "+ + bitcount); + } + } + + public short getBitCount() { return biBitCount; } + + public void setCompression(int compression) throws BMPException { + switch(compression){ + case BI_RLE8: + if(getBitCount() != 8) + throw new BMPException("Invalid number of bits per pixel."); + biCompression = compression; + break; + case BI_RLE4: + if(getBitCount() != 4) + throw new BMPException("Invalid number of bits per pixel."); + biCompression = compression; + break; + + case BI_RGB: + case BI_BITFIELDS: + biCompression = compression; + break; + + default: + throw new BMPException("Unknown bitmap compression type."); + } + } + + public int getNumberOfPaletteEntries(){ + if(biClrUsed == 0) + switch(biBitCount){ + case 1: + return 2; + case 4: + return 16; + case 8: + return 256; + + default: // should not happen + return 0; + } + + return biClrUsed; + } + + public int getCompression(){ + return biCompression; + } + + public Dimension getSize(){ + return new Dimension(biWidth, biHeight); + } + + public int getWidth(){ + return biWidth; + } + + public int getHeight(){ + return biHeight; + } + + public void setSize(Dimension d){ + biWidth = (int)d.getWidth(); + biHeight = (int)d.getHeight(); + } + +} |