utilbitmap.c revision 41c30155 
1/*
2
3Copyright 1990, 1994, 1998  The Open Group
4
5Permission to use, copy, modify, distribute, and sell this software and its
6documentation for any purpose is hereby granted without fee, provided that
7the above copyright notice appear in all copies and that both that
8copyright notice and this permission notice appear in supporting
9documentation.
10
11The above copyright notice and this permission notice shall be included in
12all copies or substantial portions of the Software.
13
14THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
17OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
18AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
19CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20
21Except as contained in this notice, the name of The Open Group shall not be
22used in advertising or otherwise to promote the sale, use or other dealings
23in this Software without prior written authorization from The Open Group.
24
25*/
26
27/*
28 * Author:  Keith Packard, MIT X Consortium
29 */
30
31#ifdef HAVE_CONFIG_H
32#include <config.h>
33#endif
34#include <X11/fonts/fontmisc.h>
35
36/* Utility functions for reformating font bitmaps */
37
38static const unsigned char _reverse_byte[0x100] = {
39	0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
40	0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
41	0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
42	0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
43	0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
44	0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
45	0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
46	0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
47	0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
48	0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
49	0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
50	0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
51	0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
52	0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
53	0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
54	0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
55	0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
56	0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
57	0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
58	0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
59	0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
60	0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
61	0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
62	0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
63	0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
64	0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
65	0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
66	0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
67	0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
68	0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
69	0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
70	0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
71};
72
73/*
74 *	Invert bit order within each BYTE of an array.
75 */
76void
77BitOrderInvert(unsigned char *buf, int nbytes)
78{
79    const unsigned char *rev = _reverse_byte;
80
81    for (; --nbytes >= 0; buf++)
82	*buf = rev[*buf];
83}
84
85/*
86 *	Invert byte order within each 16-bits of an array.
87 */
88void
89TwoByteSwap(unsigned char *buf, int nbytes)
90{
91    unsigned char c;
92
93    for (; nbytes > 0; nbytes -= 2, buf += 2)
94    {
95	c = buf[0];
96	buf[0] = buf[1];
97	buf[1] = c;
98    }
99}
100
101/*
102 *	Invert byte order within each 32-bits of an array.
103 */
104void
105FourByteSwap(unsigned char *buf, int nbytes)
106{
107    unsigned char c;
108
109    for (; nbytes > 0; nbytes -= 4, buf += 4)
110    {
111	c = buf[0];
112	buf[0] = buf[3];
113	buf[3] = c;
114	c = buf[1];
115	buf[1] = buf[2];
116	buf[2] = c;
117    }
118}
119
120/*
121 *	Repad a bitmap
122 */
123
124int
125RepadBitmap (char *pSrc, char *pDst,
126	     unsigned int srcPad, unsigned int dstPad,
127	     int width, int height)
128{
129    int	    srcWidthBytes,dstWidthBytes;
130    int	    row,col;
131    char    *pTmpSrc,*pTmpDst;
132
133    switch (srcPad) {
134    case 1:
135	srcWidthBytes = (width+7)>>3;
136	break;
137    case 2:
138	srcWidthBytes = ((width+15)>>4)<<1;
139	break;
140    case 4:
141	srcWidthBytes = ((width+31)>>5)<<2;
142	break;
143    case 8:
144	srcWidthBytes = ((width+63)>>6)<<3;
145	break;
146    default:
147	return 0;
148    }
149    switch (dstPad) {
150    case 1:
151	dstWidthBytes = (width+7)>>3;
152	break;
153    case 2:
154	dstWidthBytes = ((width+15)>>4)<<1;
155	break;
156    case 4:
157	dstWidthBytes = ((width+31)>>5)<<2;
158	break;
159    case 8:
160	dstWidthBytes = ((width+63)>>6)<<3;
161	break;
162    default:
163	return 0;
164    }
165
166    width = srcWidthBytes;
167    if (width > dstWidthBytes)
168	width = dstWidthBytes;
169    pTmpSrc= pSrc;
170    pTmpDst= pDst;
171    for (row = 0; row < height; row++)
172    {
173	for (col = 0; col < width; col++)
174	    *pTmpDst++ = *pTmpSrc++;
175	while (col < dstWidthBytes)
176 	{
177	    *pTmpDst++ = '\0';
178	    col++;
179	}
180	pTmpSrc += srcWidthBytes - width;
181    }
182    return dstWidthBytes * height;
183}
184
185
186