8903b0e6cbd44e121702a7877d93bf661cc4bfde
2 * Mesa 3-D graphics library
5 * Copyright (C) 1995 Thorsten.Ohl @ Physik.TH-Darmstadt.de
6 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
7 * Copyright (C) 2009 VMware, Inc. All Rights Reserved.
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
23 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
24 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
29 * Fake implementation of glXUseXFont().
33 #include "main/context.h"
34 #include "main/imports.h"
38 /* Some debugging info. */
49 dump_char_struct(XCharStruct
* ch
, char *prefix
)
51 printf("%slbearing = %d, rbearing = %d, width = %d\n",
52 prefix
, ch
->lbearing
, ch
->rbearing
, ch
->width
);
53 printf("%sascent = %d, descent = %d, attributes = %u\n",
54 prefix
, ch
->ascent
, ch
->descent
, (unsigned int) ch
->attributes
);
58 dump_font_struct(XFontStruct
* font
)
60 printf("ascent = %d, descent = %d\n", font
->ascent
, font
->descent
);
61 printf("char_or_byte2 = (%u,%u)\n",
62 font
->min_char_or_byte2
, font
->max_char_or_byte2
);
63 printf("byte1 = (%u,%u)\n", font
->min_byte1
, font
->max_byte1
);
64 printf("all_chars_exist = %s\n", font
->all_chars_exist
? "True" : "False");
65 printf("default_char = %c (\\%03o)\n",
66 (char) (isprint(font
->default_char
) ? font
->default_char
: ' '),
68 dump_char_struct(&font
->min_bounds
, "min> ");
69 dump_char_struct(&font
->max_bounds
, "max> ");
71 for (c
= font
->min_char_or_byte2
; c
<= font
->max_char_or_byte2
; c
++) {
73 sprintf(prefix
, "%d> ", c
);
74 dump_char_struct(&font
->per_char
[c
], prefix
);
80 dump_bitmap(unsigned int width
, unsigned int height
, GLubyte
* bitmap
)
85 for (x
= 0; x
< 8 * width
; x
++)
86 printf("%o", 7 - (x
% 8));
88 for (y
= 0; y
< height
; y
++) {
90 for (x
= 0; x
< 8 * width
; x
++)
91 putchar((bitmap
[width
* (height
- y
- 1) + x
/ 8] & (1 << (7 - (x
%
95 for (x
= 0; x
< width
; x
++)
96 printf("0x%02x, ", bitmap
[width
* (height
- y
- 1) + x
]);
103 /* Implementation. */
105 /* Fill a BITMAP with a character C from thew current font
106 in the graphics context GC. WIDTH is the width in bytes
107 and HEIGHT is the height in bits.
109 Note that the generated bitmaps must be used with
111 glPixelStorei (GL_UNPACK_SWAP_BYTES, GL_FALSE);
112 glPixelStorei (GL_UNPACK_LSB_FIRST, GL_FALSE);
113 glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
114 glPixelStorei (GL_UNPACK_SKIP_ROWS, 0);
115 glPixelStorei (GL_UNPACK_SKIP_PIXELS, 0);
116 glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
118 Possible optimizations:
120 * use only one reusable pixmap with the maximum dimensions.
121 * draw the entire font into a single pixmap (careful with
122 proportional fonts!).
127 * Generate OpenGL-compatible bitmap.
130 fill_bitmap(Display
* dpy
, Window win
, GC gc
,
131 unsigned int width
, unsigned int height
,
132 int x0
, int y0
, unsigned int c
, GLubyte
* bitmap
)
139 pixmap
= XCreatePixmap(dpy
, win
, 8 * width
, height
, 1);
140 XSetForeground(dpy
, gc
, 0);
141 XFillRectangle(dpy
, pixmap
, gc
, 0, 0, 8 * width
, height
);
142 XSetForeground(dpy
, gc
, 1);
144 char2b
.byte1
= (c
>> 8) & 0xff;
145 char2b
.byte2
= (c
& 0xff);
147 XDrawString16(dpy
, pixmap
, gc
, x0
, y0
, &char2b
, 1);
149 image
= XGetImage(dpy
, pixmap
, 0, 0, 8 * width
, height
, 1, XYPixmap
);
151 /* Fill the bitmap (X11 and OpenGL are upside down wrt each other). */
152 for (y
= 0; y
< height
; y
++)
153 for (x
= 0; x
< 8 * width
; x
++)
154 if (XGetPixel(image
, x
, y
))
155 bitmap
[width
* (height
- y
- 1) + x
/ 8] |=
156 (1 << (7 - (x
% 8)));
157 XDestroyImage(image
);
160 XFreePixmap(dpy
, pixmap
);
164 * determine if a given glyph is valid and return the
165 * corresponding XCharStruct.
168 isvalid(XFontStruct
* fs
, unsigned int which
)
170 unsigned int rows
, pages
;
171 unsigned int byte1
= 0, byte2
= 0;
174 rows
= fs
->max_byte1
- fs
->min_byte1
+ 1;
175 pages
= fs
->max_char_or_byte2
- fs
->min_char_or_byte2
+ 1;
179 if ((fs
->min_char_or_byte2
> which
) || (fs
->max_char_or_byte2
< which
))
184 byte2
= which
& 0xff;
186 if ((fs
->min_char_or_byte2
> byte2
) ||
187 (fs
->max_char_or_byte2
< byte2
) ||
188 (fs
->min_byte1
> byte1
) || (fs
->max_byte1
< byte1
))
196 return (fs
->per_char
+ (which
- fs
->min_char_or_byte2
));
200 i
= ((byte1
- fs
->min_byte1
) * pages
) +
201 (byte2
- fs
->min_char_or_byte2
);
202 return (fs
->per_char
+ i
);
206 return (&fs
->min_bounds
);
214 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 i
= DefaultScreen(dpy
);
233 win
= RootWindow(dpy
, i
);
235 fs
= XQueryFont(dpy
, font
);
237 _mesa_error(NULL
, GL_INVALID_VALUE
,
238 "Couldn't get font structure information");
242 /* Allocate a bitmap that can fit all characters. */
243 max_width
= fs
->max_bounds
.rbearing
- fs
->min_bounds
.lbearing
;
244 max_height
= fs
->max_bounds
.ascent
+ fs
->max_bounds
.descent
;
245 max_bm_width
= (max_width
+ 7) / 8;
246 max_bm_height
= max_height
;
248 bm
= (GLubyte
*) MALLOC((max_bm_width
* max_bm_height
) * sizeof(GLubyte
));
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
++) {
297 unsigned int width
, height
, bm_width
, bm_height
;
298 GLfloat x0
, y0
, dx
, dy
;
301 unsigned int c
= first
+ i
;
302 int list
= listbase
+ i
;
305 /* check on index validity and get the bounds */
308 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
, bm_height
);
354 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
);