mirror of git://gcc.gnu.org/git/gcc.git
318 lines
8.3 KiB
Java
318 lines
8.3 KiB
Java
/* BMPInfoHeader.java --
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Copyright (C) 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.javax.imageio.bmp;
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import java.awt.Dimension;
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import java.awt.image.ColorModel;
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import java.awt.image.RenderedImage;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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import javax.imageio.IIOImage;
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import javax.imageio.ImageWriteParam;
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import javax.imageio.stream.ImageInputStream;
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import javax.imageio.stream.ImageOutputStream;
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public class BMPInfoHeader
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{
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/** Size of the bitmap info header */
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protected int biSize;
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/** Pixel width of the bitmap */
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protected int biWidth;
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/** Pixel height of the bitmap */
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protected int biHeight;
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/** Number of bitplanes = 1 */
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protected short biPlanes;
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/** Number of bpp = 1,4,8,24 */
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protected short biBitCount;
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/** Compression type, RGB8, RLE8, RLE4, BITFIELDS */
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protected int biCompression;
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/** Byte size of the uncompressed bitmap, can be 0. */
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protected int biSizeImage;
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/** X resolution, dots per meter */
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protected int biXPelsPerMeter;
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/** Y resolution, dots per meter */
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protected int biYPelsPerMeter;
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/** Number of colors used (palette only, can be 0 for all) */
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protected int biClrUsed;
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/** Number of 'important' colors, 0 for all */
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protected int biClrImportant;
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/** BITMAPINFOHEADER is 40 bytes */
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public static final int SIZE = 40;
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/**
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* Compression types
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*/
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public static final int BI_RGB = 0;
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public static final int BI_RLE8 = 1;
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public static final int BI_RLE4 = 2;
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public static final int BI_BITFIELDS = 3;
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/**
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* Creates the header from an input stream, which is not closed.
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*
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* @param in - the image input stream
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* @throws IOException if an I/O error occured.
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* @throws BMPException if the header was invalid
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*/
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public BMPInfoHeader(ImageInputStream in) throws IOException, BMPException
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{
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byte[] data = new byte[SIZE];
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if (in.read(data) != SIZE)
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throw new IOException("Couldn't read header.");
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ByteBuffer buf = ByteBuffer.wrap(data);
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buf.order(ByteOrder.LITTLE_ENDIAN);
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int n;
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if ((n = buf.getInt()) != SIZE)
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throw new BMPException("Invalid BITMAPINFOHEADER size: " + n);
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biWidth = buf.getInt();
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biHeight = buf.getInt();
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biPlanes = buf.getShort();
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setBitCount(buf.getShort());
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setCompression(buf.getInt());
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biSizeImage = buf.getInt();
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biXPelsPerMeter = buf.getInt();
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biYPelsPerMeter = buf.getInt();
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biClrUsed = buf.getInt();
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biClrImportant = buf.getInt();
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}
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/**
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* Creates the info header from an output stream, which is not closed.
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*
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* @param out - the image output stream
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* @param im - the image
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* @param param - the image write param.
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* @throws IOException if an I/O error occured.
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*/
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public BMPInfoHeader(ImageOutputStream out, IIOImage im, ImageWriteParam param) throws IOException
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{
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RenderedImage img = im.getRenderedImage();
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ColorModel cMod = img.getColorModel();
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biSize = SIZE;
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biWidth = img.getWidth();
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biHeight = img.getHeight();
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biPlanes = 1;
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if (param != null && param.canWriteCompressed())
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{
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String compType = param.getCompressionType();
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if (compType.equals("BI_RLE8"))
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{
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biCompression = BI_RLE8;
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biBitCount = 8;
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}
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else if (compType.equals("BI_RLE4"))
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{
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biCompression = BI_RLE4;
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biBitCount = 4;
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}
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else
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{
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biCompression = BI_RGB;
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biBitCount = (short) cMod.getPixelSize();
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}
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}
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else
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{
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biBitCount = (short) cMod.getPixelSize();
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biCompression = BI_RGB;
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}
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biXPelsPerMeter = 0x0;
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biYPelsPerMeter = 0x0;
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biClrUsed = 0;
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biClrImportant = 0;
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biSizeImage = ((biWidth * biHeight) * 3)
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+ ((4 - ((biWidth * 3) % 4)) * biHeight);
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out.write(intToDWord(biSize));
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out.write(intToDWord(biWidth));
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out.write(intToDWord(biHeight));
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out.write(intToWord(biPlanes));
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out.write(intToWord(biBitCount));
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out.write(intToDWord(biCompression));
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out.write(intToDWord(biSizeImage));
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out.write(intToDWord(biXPelsPerMeter));
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out.write(intToDWord(biYPelsPerMeter));
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out.write(intToDWord(biClrUsed));
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out.write(intToDWord(biClrImportant));
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}
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/**
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* Converts an int to a word, where the return value is stored in a
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* 2-byte array.
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*
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* @param val - the value to convert
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* @return the array
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*/
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private byte[] intToWord(int val)
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{
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byte b[] = new byte[2];
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b[0] = (byte) (val & 0x00FF);
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b[1] = (byte) ((val >> 8) & 0x00FF);
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return b;
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}
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/**
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* Converts an int to a double word, where the return value is
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* stored in a 4-byte array.
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*
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* @param val - the value to convert
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* @return the array
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*/
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private byte[] intToDWord(int val)
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{
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byte b[] = new byte[4];
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b[0] = (byte) (val & 0x00FF);
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b[1] = (byte) ((val >> 8) & 0x000000FF);
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b[2] = (byte) ((val >> 16) & 0x000000FF);
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b[3] = (byte) ((val >> 24) & 0x000000FF);
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return b;
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}
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public void setBitCount(short bitcount) throws BMPException
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{
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switch (bitcount)
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{
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case 1:
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case 4:
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case 8:
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case 16:
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case 24:
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case 32:
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biBitCount = bitcount;
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break;
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default:
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throw new BMPException("Invalid number of bits per pixel: " + bitcount);
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}
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}
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public short getBitCount()
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{
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return biBitCount;
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}
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public void setCompression(int compression) throws BMPException
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{
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switch (compression)
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{
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case BI_RLE8:
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if (getBitCount() != 8)
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throw new BMPException("Invalid number of bits per pixel.");
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biCompression = compression;
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break;
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case BI_RLE4:
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if (getBitCount() != 4)
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throw new BMPException("Invalid number of bits per pixel.");
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biCompression = compression;
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break;
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case BI_RGB:
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case BI_BITFIELDS:
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biCompression = compression;
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break;
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default:
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throw new BMPException("Unknown bitmap compression type.");
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}
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}
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public int getNumberOfPaletteEntries()
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{
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if (biClrUsed == 0)
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switch (biBitCount)
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{
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case 1:
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return 2;
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case 4:
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return 16;
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case 8:
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return 256;
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default: // should not happen
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return 0;
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}
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return biClrUsed;
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}
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public int getCompression()
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{
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return biCompression;
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}
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public Dimension getSize()
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{
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return new Dimension(biWidth, biHeight);
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}
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public int getWidth()
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{
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return biWidth;
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}
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public int getHeight()
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{
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return biHeight;
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}
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public void setSize(Dimension d)
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{
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biWidth = (int) d.getWidth();
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biHeight = (int) d.getHeight();
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}
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}
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