3 * Mesa 3-D graphics library
6 * Copyright (C) 1999-2000 Brian Paul All Rights Reserved.
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
22 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR 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 <GL/vms_x_fix.h>
35 #include "glxheader.h"
41 /* Some debugging info. */
52 dump_char_struct (XCharStruct
*ch
, char *prefix
)
54 printf ("%slbearing = %d, rbearing = %d, width = %d\n",
55 prefix
, ch
->lbearing
, ch
->rbearing
, ch
->width
);
56 printf ("%sascent = %d, descent = %d, attributes = %u\n",
57 prefix
, ch
->ascent
, ch
->descent
, (unsigned int) ch
->attributes
);
61 dump_font_struct (XFontStruct
*font
)
63 printf ("ascent = %d, descent = %d\n", font
->ascent
, font
->descent
);
64 printf ("char_or_byte2 = (%u,%u)\n",
65 font
->min_char_or_byte2
, font
->max_char_or_byte2
);
66 printf ("byte1 = (%u,%u)\n", font
->min_byte1
, font
->max_byte1
);
67 printf ("all_chars_exist = %s\n", font
->all_chars_exist
? "True" :
69 printf ("default_char = %c (\\%03o)\n",
70 (char) (isprint (font
->default_char
) ? font
->default_char
: ' '),
72 dump_char_struct (&font
->min_bounds
, "min> ");
73 dump_char_struct (&font
->max_bounds
, "max> ");
75 for (c
= font
->min_char_or_byte2
; c
<= font
->max_char_or_byte2
; c
++)
78 sprintf (prefix
, "%d> ", c
);
79 dump_char_struct (&font
->per_char
[c
], prefix
);
85 dump_bitmap (unsigned int width
, unsigned int height
, GLubyte
*bitmap
)
90 for (x
= 0; x
< 8*width
; x
++)
91 printf ("%o", 7 - (x
% 8));
93 for (y
= 0; y
< height
; y
++)
96 for (x
= 0; x
< 8*width
; x
++)
97 putchar ((bitmap
[width
*(height
- y
- 1) + x
/8] & (1 << (7 - (x
%
101 for (x
= 0; x
< width
; x
++)
102 printf ("0x%02x, ", bitmap
[width
*(height
- y
- 1) + x
]);
109 /* Implementation. */
111 /* Fill a BITMAP with a character C from thew current font
112 in the graphics context GC. WIDTH is the width in bytes
113 and HEIGHT is the height in bits.
115 Note that the generated bitmaps must be used with
117 glPixelStorei (GL_UNPACK_SWAP_BYTES, GL_FALSE);
118 glPixelStorei (GL_UNPACK_LSB_FIRST, GL_FALSE);
119 glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
120 glPixelStorei (GL_UNPACK_SKIP_ROWS, 0);
121 glPixelStorei (GL_UNPACK_SKIP_PIXELS, 0);
122 glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
124 Possible optimizations:
126 * use only one reusable pixmap with the maximum dimensions.
127 * draw the entire font into a single pixmap (careful with
128 proportional fonts!).
133 * Generate OpenGL-compatible bitmap.
136 fill_bitmap (Display
*dpy
, Window win
, GC gc
,
137 unsigned int width
, unsigned int height
,
138 int x0
, int y0
, unsigned int c
, GLubyte
*bitmap
)
145 pixmap
= XCreatePixmap (dpy
, win
, 8*width
, height
, 1);
146 XSetForeground(dpy
, gc
, 0);
147 XFillRectangle (dpy
, pixmap
, gc
, 0, 0, 8*width
, height
);
148 XSetForeground(dpy
, gc
, 1);
150 char2b
.byte1
= (c
>> 8) & 0xff;
151 char2b
.byte2
= (c
& 0xff);
153 XDrawString16 (dpy
, pixmap
, gc
, x0
, y0
, &char2b
, 1);
155 image
= XGetImage (dpy
, pixmap
, 0, 0, 8*width
, height
, 1, XYPixmap
);
157 /* Fill the bitmap (X11 and OpenGL are upside down wrt each other). */
158 for (y
= 0; y
< height
; y
++)
159 for (x
= 0; x
< 8*width
; x
++)
160 if (XGetPixel (image
, x
, y
))
161 bitmap
[width
*(height
- y
- 1) + x
/8] |= (1 << (7 - (x
% 8)));
162 XDestroyImage (image
);
165 XFreePixmap (dpy
, pixmap
);
169 * determine if a given glyph is valid and return the
170 * corresponding XCharStruct.
172 static XCharStruct
*isvalid(XFontStruct
*fs
, unsigned int which
)
174 unsigned int rows
,pages
;
175 unsigned int byte1
= 0,byte2
= 0;
178 rows
= fs
->max_byte1
- fs
->min_byte1
+ 1;
179 pages
= fs
->max_char_or_byte2
- fs
->min_char_or_byte2
+ 1;
183 if ((fs
->min_char_or_byte2
> which
) ||
184 (fs
->max_char_or_byte2
< which
)) valid
= 0;
187 byte2
= which
& 0xff;
189 if ((fs
->min_char_or_byte2
> byte2
) ||
190 (fs
->max_char_or_byte2
< byte2
) ||
191 (fs
->min_byte1
> byte1
) ||
192 (fs
->max_byte1
< byte1
)) valid
= 0;
199 return(fs
->per_char
+ (which
-fs
->min_char_or_byte2
) );
202 i
= ((byte1
- fs
->min_byte1
) * pages
) +
203 (byte2
- fs
->min_char_or_byte2
);
204 return(fs
->per_char
+ i
);
207 return(&fs
->min_bounds
);
214 void Fake_glXUseXFont( Font font
, int first
, int count
, int listbase
)
221 unsigned long valuemask
;
223 GLint swapbytes
, lsbfirst
, rowlength
;
224 GLint skiprows
, skippixels
, alignment
;
225 unsigned int max_width
, max_height
, max_bm_width
, max_bm_height
;
229 dpy
= glXGetCurrentDisplay();
231 return; /* I guess glXMakeCurrent wasn't called */
232 win
= RootWindow(dpy
, DefaultScreen(dpy
));
234 fs
= XQueryFont (dpy
, font
);
236 _mesa_error(NULL
, GL_INVALID_VALUE
,
237 "Couldn't get font structure information");
241 /* Allocate a bitmap that can fit all characters. */
242 max_width
= fs
->max_bounds
.rbearing
- fs
->min_bounds
.lbearing
;
243 max_height
= fs
->max_bounds
.ascent
+ fs
->max_bounds
.descent
;
244 max_bm_width
= (max_width
+ 7) / 8;
245 max_bm_height
= max_height
;
247 bm
= (GLubyte
*) MALLOC((max_bm_width
* max_bm_height
) * sizeof
250 XFreeFontInfo( NULL
, fs
, 1 );
251 _mesa_error(NULL
, GL_OUT_OF_MEMORY
,
252 "Couldn't allocate bitmap in glXUseXFont()");
257 /* get the page info */
258 pages
= fs
->max_char_or_byte2
- fs
->min_char_or_byte2
+ 1;
259 firstchar
= (fs
->min_byte1
<< 8) + fs
->min_char_or_byte2
;
260 lastchar
= (fs
->max_byte1
<< 8) + fs
->max_char_or_byte2
;
261 rows
= fs
->max_byte1
- fs
->min_byte1
+ 1;
262 unsigned int first_char
, last_char
, pages
, rows
;
265 /* Save the current packing mode for bitmaps. */
266 glGetIntegerv (GL_UNPACK_SWAP_BYTES
, &swapbytes
);
267 glGetIntegerv (GL_UNPACK_LSB_FIRST
, &lsbfirst
);
268 glGetIntegerv (GL_UNPACK_ROW_LENGTH
, &rowlength
);
269 glGetIntegerv (GL_UNPACK_SKIP_ROWS
, &skiprows
);
270 glGetIntegerv (GL_UNPACK_SKIP_PIXELS
, &skippixels
);
271 glGetIntegerv (GL_UNPACK_ALIGNMENT
, &alignment
);
273 /* Enforce a standard packing mode which is compatible with
274 fill_bitmap() from above. This is actually the default mode,
275 except for the (non)alignment. */
276 glPixelStorei (GL_UNPACK_SWAP_BYTES
, GL_FALSE
);
277 glPixelStorei (GL_UNPACK_LSB_FIRST
, GL_FALSE
);
278 glPixelStorei (GL_UNPACK_ROW_LENGTH
, 0);
279 glPixelStorei (GL_UNPACK_SKIP_ROWS
, 0);
280 glPixelStorei (GL_UNPACK_SKIP_PIXELS
, 0);
281 glPixelStorei (GL_UNPACK_ALIGNMENT
, 1);
283 pixmap
= XCreatePixmap (dpy
, win
, 10, 10, 1);
284 values
.foreground
= BlackPixel (dpy
, DefaultScreen (dpy
));
285 values
.background
= WhitePixel (dpy
, DefaultScreen (dpy
));
286 values
.font
= fs
->fid
;
287 valuemask
= GCForeground
| GCBackground
| GCFont
;
288 gc
= XCreateGC (dpy
, pixmap
, valuemask
, &values
);
289 XFreePixmap (dpy
, pixmap
);
293 dump_font_struct (fs
);
296 for (i
= 0; i
< count
; i
++)
298 unsigned int width
, height
, bm_width
, bm_height
;
299 GLfloat x0
, y0
, dx
, dy
;
302 unsigned int c
= first
+ i
;
303 int list
= listbase
+ i
;
306 /* check on index validity and get the bounds */
309 ch
= &fs
->max_bounds
;
318 sprintf (s
, isprint (c
) ? "%c> " : "\\%03o> ", c
);
319 dump_char_struct (ch
, s
);
323 /* glBitmap()' parameters:
324 straight from the glXUseXFont(3) manpage. */
325 width
= ch
->rbearing
- ch
->lbearing
;
326 height
= ch
->ascent
+ ch
->descent
;
328 y0
= ch
->descent
- 0; /* XXX used to subtract 1 here */
329 /* but that caused a conformace failure */
333 /* X11's starting point. */
337 /* Round the width to a multiple of eight. We will use this also
338 for the pixmap for capturing the X11 font. This is slightly
339 inefficient, but it makes the OpenGL part real easy. */
340 bm_width
= (width
+ 7) / 8;
343 glNewList (list
, GL_COMPILE
);
344 if (valid
&& (bm_width
> 0) && (bm_height
> 0)) {
346 MEMSET (bm
, '\0', bm_width
* bm_height
);
347 fill_bitmap (dpy
, win
, gc
, bm_width
, bm_height
, x
, y
, c
, bm
);
349 glBitmap (width
, height
, x0
, y0
, dx
, dy
, bm
);
352 printf ("width/height = %u/%u\n", width
, height
);
353 printf ("bm_width/bm_height = %u/%u\n", bm_width
,
355 dump_bitmap (bm_width
, bm_height
, bm
);
359 glBitmap (0, 0, 0.0, 0.0, dx
, dy
, NULL
);
365 XFreeFontInfo( NULL
, fs
, 1 );
368 /* Restore saved packing modes. */
369 glPixelStorei(GL_UNPACK_SWAP_BYTES
, swapbytes
);
370 glPixelStorei(GL_UNPACK_LSB_FIRST
, lsbfirst
);
371 glPixelStorei(GL_UNPACK_ROW_LENGTH
, rowlength
);
372 glPixelStorei(GL_UNPACK_SKIP_ROWS
, skiprows
);
373 glPixelStorei(GL_UNPACK_SKIP_PIXELS
, skippixels
);
374 glPixelStorei(GL_UNPACK_ALIGNMENT
, alignment
);