001: /*
002: * @(#)BitmapImageSource.java 1.13 06/10/10
003: *
004: * Copyright 1990-2006 Sun Microsystems, Inc. All Rights Reserved.
005: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006: *
007: * This program is free software; you can redistribute it and/or
008: * modify it under the terms of the GNU General Public License version
009: * 2 only, as published by the Free Software Foundation.
010: *
011: * This program is distributed in the hope that it will be useful, but
012: * WITHOUT ANY WARRANTY; without even the implied warranty of
013: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014: * General Public License version 2 for more details (a copy is
015: * included at /legal/license.txt).
016: *
017: * You should have received a copy of the GNU General Public License
018: * version 2 along with this work; if not, write to the Free Software
019: * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020: * 02110-1301 USA
021: *
022: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023: * Clara, CA 95054 or visit www.sun.com if you need additional
024: * information or have any questions.
025: *
026: */
027: package sun.porting.utils;
028:
029: import java.awt.Color;
030: import java.awt.image.*;
031:
032: /**
033: * A memory image source whose memory representation consists of
034: * a packed bitmap (32 bits packed into each int) and an IndexColorModel
035: * describing the colors represented by the bits (i.e. the background color
036: * maps to pixel value 0 and the foreground color to pixel value 1).
037: * @version 1.8
038: */
039: public class BitmapImageSource extends MemoryImageSource {
040: /**
041: * Create an image source for an image of the given width and height,
042: * with packed bitmap data stored in pix[] and using the given
043: * IndexColorModel to translate the bits into colors.
044: * @param w The width of the image
045: * @param h The height of the image
046: * @param pix The bitmap data, packed 32 pixels per int. The data must
047: * be padded so that each scanline starts on an int boundary.
048: * @param cm The color model describing the meanings of 0 (background)
049: * and 1 (foreground).
050: */
051: public BitmapImageSource(int w, int h, int pix[], IndexColorModel cm) {
052: super (w, h, cm, translatePixels(pix, w, h), 0, w);
053: }
054:
055: /**
056: * Create an IndexColorModel of size 2 that translates color 0 to the given
057: * background color and color 1 to the given foreground color.
058: * @param fg The desired foreground color
059: * @param bg The desired background color
060: * @return An IndexColorModel which maps 1/0 to the given colors.
061: */
062: protected static IndexColorModel makeColorModel(Color fg, Color bg) {
063: byte r[] = new byte[2];
064: byte g[] = new byte[2];
065: byte b[] = new byte[2];
066: r[0] = (byte) bg.getRed();
067: g[0] = (byte) bg.getGreen();
068: b[0] = (byte) bg.getBlue();
069: r[1] = (byte) fg.getRed();
070: g[1] = (byte) fg.getGreen();
071: b[1] = (byte) fg.getBlue();
072: return new IndexColorModel(8, 2, r, g, b, 0);
073: }
074:
075: /**
076: * Translate bitmap image data into byte image data.
077: * Takes a bitmap packed 32 pixels to an int (i.e. 1 bit of data per pixel,
078: * plus padding), and returns one byte of data per pixel, no padding.
079: * @param pix The input pixel data (bitmap data)
080: * @param width The width of the input bitmap
081: * @param height The height of the input bitmap
082: * @return A byte array containing the translated bitmap.
083: */
084: protected static byte[] translatePixels(int pix[], int width,
085: int height) {
086: byte data[] = new byte[height * width];
087: for (int y = 0; y < height; ++y) {
088: int ix = y * ((width + 31) >> 5);
089: int d = pix[ix++];
090: int mask = (int) 0x80000000;
091: for (int x = 0; x < width; ++x) {
092: if (mask == 0) {
093: d = pix[ix++];
094: mask = (int) 0x80000000;
095: }
096: if ((mask & d) != 0) {
097: data[y * width + x] = 1;
098: }
099: mask >>>= 1;
100: }
101: }
102: return data;
103: }
104: }
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