/*
* Copyright (c) 1995, 2003, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*-
* Reads xbitmap format images into a DIBitmap structure.
*/
package sun.awt.image;
import java.io.*;
import java.awt.image.*;
/**
* Parse files of the form:
*
* #define foo_width w
* #define foo_height h
* static char foo_bits[] = {
* 0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,
* 0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,0xnn,
* 0xnn,0xnn,0xnn,0xnn};
*
* @author James Gosling
*/
public class XbmImageDecoder extends ImageDecoder {
private static byte XbmColormap[] = {(byte) 255, (byte) 255, (byte) 255,
0, 0, 0};
private static int XbmHints = (ImageConsumer.TOPDOWNLEFTRIGHT |
ImageConsumer.COMPLETESCANLINES |
ImageConsumer.SINGLEPASS |
ImageConsumer.SINGLEFRAME);
public XbmImageDecoder(InputStreamImageSource src, InputStream is) {
super(src, is);
if (!(input instanceof BufferedInputStream)) {
// If the topmost stream is a metered stream,
// we take forever to decode the image...
input = new BufferedInputStream(input, 80);
}
}
/**
* An error has occurred. Throw an exception.
*/
private static void error(String s1) throws ImageFormatException {
throw new ImageFormatException(s1);
}
/**
* produce an image from the stream.
*/
public void produceImage() throws IOException, ImageFormatException {
char nm[] = new char[80];
int c;
int i = 0;
int state = 0;
int H = 0;
int W = 0;
int x = 0;
int y = 0;
boolean start = true;
byte raster[] = null;
IndexColorModel model = null;
while (!aborted && (c = input.read()) != -1) {
if ('a' <= c && c <= 'z' ||
'A' <= c && c <= 'Z' ||
'0' <= c && c <= '9' || c == '#' || c == '_') {
if (i < 78)
nm[i++] = (char) c;
} else if (i > 0) {
int nc = i;
i = 0;
if (start) {
if (nc != 7 ||
nm[0] != '#' ||
nm[1] != 'd' ||
nm[2] != 'e' ||
nm[3] != 'f' ||
nm[4] != 'i' ||
nm[5] != 'n' ||
nm[6] != 'e')
{
error("Not an XBM file");
}
start = false;
}
if (nm[nc - 1] == 'h')
state = 1; /* expecting width */
else if (nm[nc - 1] == 't' && nc > 1 && nm[nc - 2] == 'h')
state = 2; /* expecting height */
else if (nc > 2 && state < 0 && nm[0] == '0' && nm[1] == 'x') {
int n = 0;
for (int p = 2; p < nc; p++) {
c = nm[p];
if ('0' <= c && c <= '9')
c = c - '0';
else if ('A' <= c && c <= 'Z')
c = c - 'A' + 10;
else if ('a' <= c && c <= 'z')
c = c - 'a' + 10;
else
c = 0;
n = n * 16 + c;
}
for (int mask = 1; mask <= 0x80; mask <<= 1) {
if (x < W) {
if ((n & mask) != 0)
raster[x] = 1;
else
raster[x] = 0;
}
x++;
}
if (x >= W) {
if (setPixels(0, y, W, 1, model, raster, 0, W) <= 0) {
return;
}
x = 0;
if (y++ >= H) {
break;
}
}
} else {
int n = 0;
for (int p = 0; p < nc; p++)
if ('0' <= (c = nm[p]) && c <= '9')
n = n * 10 + c - '0';
else {
n = -1;
break;
}
if (n > 0 && state > 0) {
if (state == 1)
W = n;
else
H = n;
if (W == 0 || H == 0)
state = 0;
else {
model = new IndexColorModel(8, 2, XbmColormap,
0, false, 0);
setDimensions(W, H);
setColorModel(model);
setHints(XbmHints);
headerComplete();
raster = new byte[W];
state = -1;
}
}
}
}
}
input.close();
imageComplete(ImageConsumer.STATICIMAGEDONE, true);
}
}