3 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2000 Brian Paul All Rights Reserved.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
27 /* xfonts.c -- glXUseXFont() for Mesa written by
28 * Copyright (C) 1995 Thorsten.Ohl @ Physik.TH-Darmstadt.de
32 #include "glxheader.h"
33 #include "main/context.h"
34 #include "main/imports.h"
38 /* Some debugging info. */
46 dump_char_struct(XCharStruct
* ch
, char *prefix
)
48 printf("%slbearing = %d, rbearing = %d, width = %d\n",
49 prefix
, ch
->lbearing
, ch
->rbearing
, ch
->width
);
50 printf("%sascent = %d, descent = %d, attributes = %u\n",
51 prefix
, ch
->ascent
, ch
->descent
, (unsigned int) ch
->attributes
);
55 dump_font_struct(XFontStruct
* font
)
57 printf("ascent = %d, descent = %d\n", font
->ascent
, font
->descent
);
58 printf("char_or_byte2 = (%u,%u)\n",
59 font
->min_char_or_byte2
, font
->max_char_or_byte2
);
60 printf("byte1 = (%u,%u)\n", font
->min_byte1
, font
->max_byte1
);
61 printf("all_chars_exist = %s\n", font
->all_chars_exist
? "True" : "False");
62 printf("default_char = %c (\\%03o)\n",
63 (char) (isprint(font
->default_char
) ? font
->default_char
: ' '),
65 dump_char_struct(&font
->min_bounds
, "min> ");
66 dump_char_struct(&font
->max_bounds
, "max> ");
68 for (c
= font
->min_char_or_byte2
; c
<= font
->max_char_or_byte2
; c
++) {
70 sprintf(prefix
, "%d> ", c
);
71 dump_char_struct(&font
->per_char
[c
], prefix
);
77 dump_bitmap(unsigned int width
, unsigned int height
, GLubyte
* bitmap
)
82 for (x
= 0; x
< 8 * width
; x
++)
83 printf("%o", 7 - (x
% 8));
85 for (y
= 0; y
< height
; y
++) {
87 for (x
= 0; x
< 8 * width
; x
++)
88 putchar((bitmap
[width
* (height
- y
- 1) + x
/ 8] & (1 << (7 - (x
%
92 for (x
= 0; x
< width
; x
++)
93 printf("0x%02x, ", bitmap
[width
* (height
- y
- 1) + x
]);
100 /* Implementation. */
102 /* Fill a BITMAP with a character C from thew current font
103 in the graphics context GC. WIDTH is the width in bytes
104 and HEIGHT is the height in bits.
106 Note that the generated bitmaps must be used with
108 glPixelStorei (GL_UNPACK_SWAP_BYTES, GL_FALSE);
109 glPixelStorei (GL_UNPACK_LSB_FIRST, GL_FALSE);
110 glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
111 glPixelStorei (GL_UNPACK_SKIP_ROWS, 0);
112 glPixelStorei (GL_UNPACK_SKIP_PIXELS, 0);
113 glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
115 Possible optimizations:
117 * use only one reusable pixmap with the maximum dimensions.
118 * draw the entire font into a single pixmap (careful with
119 proportional fonts!).
124 * Generate OpenGL-compatible bitmap.
127 fill_bitmap(Display
* dpy
, Window win
, GC gc
,
128 unsigned int width
, unsigned int height
,
129 int x0
, int y0
, unsigned int c
, GLubyte
* bitmap
)
136 pixmap
= XCreatePixmap(dpy
, win
, 8 * width
, height
, 1);
137 XSetForeground(dpy
, gc
, 0);
138 XFillRectangle(dpy
, pixmap
, gc
, 0, 0, 8 * width
, height
);
139 XSetForeground(dpy
, gc
, 1);
141 char2b
.byte1
= (c
>> 8) & 0xff;
142 char2b
.byte2
= (c
& 0xff);
144 XDrawString16(dpy
, pixmap
, gc
, x0
, y0
, &char2b
, 1);
146 image
= XGetImage(dpy
, pixmap
, 0, 0, 8 * width
, height
, 1, XYPixmap
);
148 /* Fill the bitmap (X11 and OpenGL are upside down wrt each other). */
149 for (y
= 0; y
< height
; y
++)
150 for (x
= 0; x
< 8 * width
; x
++)
151 if (XGetPixel(image
, x
, y
))
152 bitmap
[width
* (height
- y
- 1) + x
/ 8] |=
153 (1 << (7 - (x
% 8)));
154 XDestroyImage(image
);
157 XFreePixmap(dpy
, pixmap
);
161 * determine if a given glyph is valid and return the
162 * corresponding XCharStruct.
165 isvalid(XFontStruct
* fs
, unsigned int which
)
167 unsigned int rows
, pages
;
168 unsigned int byte1
= 0, byte2
= 0;
171 rows
= fs
->max_byte1
- fs
->min_byte1
+ 1;
172 pages
= fs
->max_char_or_byte2
- fs
->min_char_or_byte2
+ 1;
176 if ((fs
->min_char_or_byte2
> which
) || (fs
->max_char_or_byte2
< which
))
181 byte2
= which
& 0xff;
183 if ((fs
->min_char_or_byte2
> byte2
) ||
184 (fs
->max_char_or_byte2
< byte2
) ||
185 (fs
->min_byte1
> byte1
) || (fs
->max_byte1
< byte1
))
193 return (fs
->per_char
+ (which
- fs
->min_char_or_byte2
));
197 i
= ((byte1
- fs
->min_byte1
) * pages
) +
198 (byte2
- fs
->min_char_or_byte2
);
199 return (fs
->per_char
+ i
);
203 return (&fs
->min_bounds
);
211 Fake_glXUseXFont(Font font
, int first
, int count
, int listbase
)
218 unsigned long valuemask
;
220 GLint swapbytes
, lsbfirst
, rowlength
;
221 GLint skiprows
, skippixels
, alignment
;
222 unsigned int max_width
, max_height
, max_bm_width
, max_bm_height
;
226 dpy
= glXGetCurrentDisplay();
228 return; /* I guess glXMakeCurrent wasn't called */
229 win
= RootWindow(dpy
, DefaultScreen(dpy
));
231 fs
= XQueryFont(dpy
, font
);
233 _mesa_error(NULL
, GL_INVALID_VALUE
,
234 "Couldn't get font structure information");
238 /* Allocate a bitmap that can fit all characters. */
239 max_width
= fs
->max_bounds
.rbearing
- fs
->min_bounds
.lbearing
;
240 max_height
= fs
->max_bounds
.ascent
+ fs
->max_bounds
.descent
;
241 max_bm_width
= (max_width
+ 7) / 8;
242 max_bm_height
= max_height
;
244 bm
= malloc((max_bm_width
* max_bm_height
) * sizeof(GLubyte
));
246 XFreeFontInfo(NULL
, fs
, 1);
247 _mesa_error(NULL
, GL_OUT_OF_MEMORY
,
248 "Couldn't allocate bitmap in glXUseXFont()");
253 /* get the page info */
254 pages
= fs
->max_char_or_byte2
- fs
->min_char_or_byte2
+ 1;
255 firstchar
= (fs
->min_byte1
<< 8) + fs
->min_char_or_byte2
;
256 lastchar
= (fs
->max_byte1
<< 8) + fs
->max_char_or_byte2
;
257 rows
= fs
->max_byte1
- fs
->min_byte1
+ 1;
258 unsigned int first_char
, last_char
, pages
, rows
;
261 /* Save the current packing mode for bitmaps. */
262 glGetIntegerv(GL_UNPACK_SWAP_BYTES
, &swapbytes
);
263 glGetIntegerv(GL_UNPACK_LSB_FIRST
, &lsbfirst
);
264 glGetIntegerv(GL_UNPACK_ROW_LENGTH
, &rowlength
);
265 glGetIntegerv(GL_UNPACK_SKIP_ROWS
, &skiprows
);
266 glGetIntegerv(GL_UNPACK_SKIP_PIXELS
, &skippixels
);
267 glGetIntegerv(GL_UNPACK_ALIGNMENT
, &alignment
);
269 /* Enforce a standard packing mode which is compatible with
270 fill_bitmap() from above. This is actually the default mode,
271 except for the (non)alignment. */
272 glPixelStorei(GL_UNPACK_SWAP_BYTES
, GL_FALSE
);
273 glPixelStorei(GL_UNPACK_LSB_FIRST
, GL_FALSE
);
274 glPixelStorei(GL_UNPACK_ROW_LENGTH
, 0);
275 glPixelStorei(GL_UNPACK_SKIP_ROWS
, 0);
276 glPixelStorei(GL_UNPACK_SKIP_PIXELS
, 0);
277 glPixelStorei(GL_UNPACK_ALIGNMENT
, 1);
279 pixmap
= XCreatePixmap(dpy
, win
, 10, 10, 1);
280 values
.foreground
= BlackPixel(dpy
, DefaultScreen(dpy
));
281 values
.background
= WhitePixel(dpy
, DefaultScreen(dpy
));
282 values
.font
= fs
->fid
;
283 valuemask
= GCForeground
| GCBackground
| GCFont
;
284 gc
= XCreateGC(dpy
, pixmap
, valuemask
, &values
);
285 XFreePixmap(dpy
, pixmap
);
289 dump_font_struct(fs
);
292 for (i
= 0; i
< count
; i
++) {
293 unsigned int width
, height
, bm_width
, bm_height
;
294 GLfloat x0
, y0
, dx
, dy
;
297 unsigned int c
= first
+ i
;
298 int list
= listbase
+ i
;
301 /* check on index validity and get the bounds */
304 ch
= &fs
->max_bounds
;
314 sprintf(s
, isprint(c
) ? "%c> " : "\\%03o> ", c
);
315 dump_char_struct(ch
, s
);
319 /* glBitmap()' parameters:
320 straight from the glXUseXFont(3) manpage. */
321 width
= ch
->rbearing
- ch
->lbearing
;
322 height
= ch
->ascent
+ ch
->descent
;
324 y0
= ch
->descent
- 0; /* XXX used to subtract 1 here */
325 /* but that caused a conformace failure */
329 /* X11's starting point. */
333 /* Round the width to a multiple of eight. We will use this also
334 for the pixmap for capturing the X11 font. This is slightly
335 inefficient, but it makes the OpenGL part real easy. */
336 bm_width
= (width
+ 7) / 8;
339 glNewList(list
, GL_COMPILE
);
340 if (valid
&& (bm_width
> 0) && (bm_height
> 0)) {
342 memset(bm
, '\0', bm_width
* bm_height
);
343 fill_bitmap(dpy
, win
, gc
, bm_width
, bm_height
, x
, y
, c
, bm
);
345 glBitmap(width
, height
, x0
, y0
, dx
, dy
, bm
);
348 printf("width/height = %u/%u\n", width
, height
);
349 printf("bm_width/bm_height = %u/%u\n", bm_width
, bm_height
);
350 dump_bitmap(bm_width
, bm_height
, bm
);
355 glBitmap(0, 0, 0.0, 0.0, dx
, dy
, NULL
);
361 XFreeFontInfo(NULL
, fs
, 1);
364 /* Restore saved packing modes. */
365 glPixelStorei(GL_UNPACK_SWAP_BYTES
, swapbytes
);
366 glPixelStorei(GL_UNPACK_LSB_FIRST
, lsbfirst
);
367 glPixelStorei(GL_UNPACK_ROW_LENGTH
, rowlength
);
368 glPixelStorei(GL_UNPACK_SKIP_ROWS
, skiprows
);
369 glPixelStorei(GL_UNPACK_SKIP_PIXELS
, skippixels
);
370 glPixelStorei(GL_UNPACK_ALIGNMENT
, alignment
);