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
31 #include "glxheader.h"
32 #include "main/context.h"
33 #include "main/imports.h"
37 /* Some debugging info. */
45 dump_char_struct(XCharStruct
* ch
, char *prefix
)
47 printf("%slbearing = %d, rbearing = %d, width = %d\n",
48 prefix
, ch
->lbearing
, ch
->rbearing
, ch
->width
);
49 printf("%sascent = %d, descent = %d, attributes = %u\n",
50 prefix
, ch
->ascent
, ch
->descent
, (unsigned int) ch
->attributes
);
54 dump_font_struct(XFontStruct
* font
)
56 printf("ascent = %d, descent = %d\n", font
->ascent
, font
->descent
);
57 printf("char_or_byte2 = (%u,%u)\n",
58 font
->min_char_or_byte2
, font
->max_char_or_byte2
);
59 printf("byte1 = (%u,%u)\n", font
->min_byte1
, font
->max_byte1
);
60 printf("all_chars_exist = %s\n", font
->all_chars_exist
? "True" : "False");
61 printf("default_char = %c (\\%03o)\n",
62 (char) (isprint(font
->default_char
) ? font
->default_char
: ' '),
64 dump_char_struct(&font
->min_bounds
, "min> ");
65 dump_char_struct(&font
->max_bounds
, "max> ");
67 for (c
= font
->min_char_or_byte2
; c
<= font
->max_char_or_byte2
; c
++) {
69 sprintf(prefix
, "%d> ", c
);
70 dump_char_struct(&font
->per_char
[c
], prefix
);
76 dump_bitmap(unsigned int width
, unsigned int height
, GLubyte
* bitmap
)
81 for (x
= 0; x
< 8 * width
; x
++)
82 printf("%o", 7 - (x
% 8));
84 for (y
= 0; y
< height
; y
++) {
86 for (x
= 0; x
< 8 * width
; x
++)
87 putchar((bitmap
[width
* (height
- y
- 1) + x
/ 8] & (1 << (7 - (x
%
91 for (x
= 0; x
< width
; x
++)
92 printf("0x%02x, ", bitmap
[width
* (height
- y
- 1) + x
]);
101 /* Fill a BITMAP with a character C from thew current font
102 in the graphics context GC. WIDTH is the width in bytes
103 and HEIGHT is the height in bits.
105 Note that the generated bitmaps must be used with
107 glPixelStorei (GL_UNPACK_SWAP_BYTES, GL_FALSE);
108 glPixelStorei (GL_UNPACK_LSB_FIRST, GL_FALSE);
109 glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
110 glPixelStorei (GL_UNPACK_SKIP_ROWS, 0);
111 glPixelStorei (GL_UNPACK_SKIP_PIXELS, 0);
112 glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
114 Possible optimizations:
116 * use only one reusable pixmap with the maximum dimensions.
117 * draw the entire font into a single pixmap (careful with
118 proportional fonts!).
123 * Generate OpenGL-compatible bitmap.
126 fill_bitmap(Display
* dpy
, Window win
, GC gc
,
127 unsigned int width
, unsigned int height
,
128 int x0
, int y0
, unsigned int c
, GLubyte
* bitmap
)
135 pixmap
= XCreatePixmap(dpy
, win
, 8 * width
, height
, 1);
136 XSetForeground(dpy
, gc
, 0);
137 XFillRectangle(dpy
, pixmap
, gc
, 0, 0, 8 * width
, height
);
138 XSetForeground(dpy
, gc
, 1);
140 char2b
.byte1
= (c
>> 8) & 0xff;
141 char2b
.byte2
= (c
& 0xff);
143 XDrawString16(dpy
, pixmap
, gc
, x0
, y0
, &char2b
, 1);
145 image
= XGetImage(dpy
, pixmap
, 0, 0, 8 * width
, height
, 1, XYPixmap
);
147 /* Fill the bitmap (X11 and OpenGL are upside down wrt each other). */
148 for (y
= 0; y
< height
; y
++)
149 for (x
= 0; x
< 8 * width
; x
++)
150 if (XGetPixel(image
, x
, y
))
151 bitmap
[width
* (height
- y
- 1) + x
/ 8] |=
152 (1 << (7 - (x
% 8)));
153 XDestroyImage(image
);
156 XFreePixmap(dpy
, pixmap
);
160 * determine if a given glyph is valid and return the
161 * corresponding XCharStruct.
164 isvalid(XFontStruct
* fs
, unsigned int which
)
166 unsigned int rows
, pages
;
167 unsigned int byte1
= 0, byte2
= 0;
170 rows
= fs
->max_byte1
- fs
->min_byte1
+ 1;
171 pages
= fs
->max_char_or_byte2
- fs
->min_char_or_byte2
+ 1;
175 if ((fs
->min_char_or_byte2
> which
) || (fs
->max_char_or_byte2
< which
))
180 byte2
= which
& 0xff;
182 if ((fs
->min_char_or_byte2
> byte2
) ||
183 (fs
->max_char_or_byte2
< byte2
) ||
184 (fs
->min_byte1
> byte1
) || (fs
->max_byte1
< byte1
))
192 return (fs
->per_char
+ (which
- fs
->min_char_or_byte2
));
196 i
= ((byte1
- fs
->min_byte1
) * pages
) +
197 (byte2
- fs
->min_char_or_byte2
);
198 return (fs
->per_char
+ i
);
202 return (&fs
->min_bounds
);
210 Fake_glXUseXFont(Font font
, int first
, int count
, int listbase
)
217 unsigned long valuemask
;
219 GLint swapbytes
, lsbfirst
, rowlength
;
220 GLint skiprows
, skippixels
, alignment
;
221 unsigned int max_width
, max_height
, max_bm_width
, max_bm_height
;
225 dpy
= glXGetCurrentDisplay();
227 return; /* I guess glXMakeCurrent wasn't called */
228 win
= RootWindow(dpy
, DefaultScreen(dpy
));
230 fs
= XQueryFont(dpy
, font
);
232 _mesa_error(NULL
, GL_INVALID_VALUE
,
233 "Couldn't get font structure information");
237 /* Allocate a bitmap that can fit all characters. */
238 max_width
= fs
->max_bounds
.rbearing
- fs
->min_bounds
.lbearing
;
239 max_height
= fs
->max_bounds
.ascent
+ fs
->max_bounds
.descent
;
240 max_bm_width
= (max_width
+ 7) / 8;
241 max_bm_height
= max_height
;
243 bm
= malloc((max_bm_width
* max_bm_height
) * sizeof(GLubyte
));
245 XFreeFontInfo(NULL
, fs
, 1);
246 _mesa_error(NULL
, GL_OUT_OF_MEMORY
,
247 "Couldn't allocate bitmap in glXUseXFont()");
252 /* get the page info */
253 pages
= fs
->max_char_or_byte2
- fs
->min_char_or_byte2
+ 1;
254 firstchar
= (fs
->min_byte1
<< 8) + fs
->min_char_or_byte2
;
255 lastchar
= (fs
->max_byte1
<< 8) + fs
->max_char_or_byte2
;
256 rows
= fs
->max_byte1
- fs
->min_byte1
+ 1;
257 unsigned int first_char
, last_char
, pages
, rows
;
260 /* Save the current packing mode for bitmaps. */
261 glGetIntegerv(GL_UNPACK_SWAP_BYTES
, &swapbytes
);
262 glGetIntegerv(GL_UNPACK_LSB_FIRST
, &lsbfirst
);
263 glGetIntegerv(GL_UNPACK_ROW_LENGTH
, &rowlength
);
264 glGetIntegerv(GL_UNPACK_SKIP_ROWS
, &skiprows
);
265 glGetIntegerv(GL_UNPACK_SKIP_PIXELS
, &skippixels
);
266 glGetIntegerv(GL_UNPACK_ALIGNMENT
, &alignment
);
268 /* Enforce a standard packing mode which is compatible with
269 fill_bitmap() from above. This is actually the default mode,
270 except for the (non)alignment. */
271 glPixelStorei(GL_UNPACK_SWAP_BYTES
, GL_FALSE
);
272 glPixelStorei(GL_UNPACK_LSB_FIRST
, GL_FALSE
);
273 glPixelStorei(GL_UNPACK_ROW_LENGTH
, 0);
274 glPixelStorei(GL_UNPACK_SKIP_ROWS
, 0);
275 glPixelStorei(GL_UNPACK_SKIP_PIXELS
, 0);
276 glPixelStorei(GL_UNPACK_ALIGNMENT
, 1);
278 pixmap
= XCreatePixmap(dpy
, win
, 10, 10, 1);
279 values
.foreground
= BlackPixel(dpy
, DefaultScreen(dpy
));
280 values
.background
= WhitePixel(dpy
, DefaultScreen(dpy
));
281 values
.font
= fs
->fid
;
282 valuemask
= GCForeground
| GCBackground
| GCFont
;
283 gc
= XCreateGC(dpy
, pixmap
, valuemask
, &values
);
284 XFreePixmap(dpy
, pixmap
);
288 dump_font_struct(fs
);
291 for (i
= 0; i
< count
; i
++) {
292 unsigned int width
, height
, bm_width
, bm_height
;
293 GLfloat x0
, y0
, dx
, dy
;
296 unsigned int c
= first
+ i
;
297 int list
= listbase
+ i
;
300 /* check on index validity and get the bounds */
303 ch
= &fs
->max_bounds
;
313 sprintf(s
, isprint(c
) ? "%c> " : "\\%03o> ", c
);
314 dump_char_struct(ch
, s
);
318 /* glBitmap()' parameters:
319 straight from the glXUseXFont(3) manpage. */
320 width
= ch
->rbearing
- ch
->lbearing
;
321 height
= ch
->ascent
+ ch
->descent
;
323 y0
= ch
->descent
- 0; /* XXX used to subtract 1 here */
324 /* but that caused a conformace failure */
328 /* X11's starting point. */
332 /* Round the width to a multiple of eight. We will use this also
333 for the pixmap for capturing the X11 font. This is slightly
334 inefficient, but it makes the OpenGL part real easy. */
335 bm_width
= (width
+ 7) / 8;
338 glNewList(list
, GL_COMPILE
);
339 if (valid
&& (bm_width
> 0) && (bm_height
> 0)) {
341 memset(bm
, '\0', bm_width
* bm_height
);
342 fill_bitmap(dpy
, win
, gc
, bm_width
, bm_height
, x
, y
, c
, bm
);
344 glBitmap(width
, height
, x0
, y0
, dx
, dy
, bm
);
347 printf("width/height = %u/%u\n", width
, height
);
348 printf("bm_width/bm_height = %u/%u\n", bm_width
, bm_height
);
349 dump_bitmap(bm_width
, bm_height
, bm
);
354 glBitmap(0, 0, 0.0, 0.0, dx
, dy
, NULL
);
360 XFreeFontInfo(NULL
, fs
, 1);
363 /* Restore saved packing modes. */
364 glPixelStorei(GL_UNPACK_SWAP_BYTES
, swapbytes
);
365 glPixelStorei(GL_UNPACK_LSB_FIRST
, lsbfirst
);
366 glPixelStorei(GL_UNPACK_ROW_LENGTH
, rowlength
);
367 glPixelStorei(GL_UNPACK_SKIP_ROWS
, skiprows
);
368 glPixelStorei(GL_UNPACK_SKIP_PIXELS
, skippixels
);
369 glPixelStorei(GL_UNPACK_ALIGNMENT
, alignment
);