1 /*
2 * freeglut_font.c
3 *
4 * Bitmap and stroke fonts displaying.
5 *
6 * Copyright (c) 1999-2000 Pawel W. Olszta. All Rights Reserved.
7 * Written by Pawel W. Olszta, <olszta@sourceforge.net>
8 * Creation date: Thu Dec 16 1999
9 *
10 * Permission is hereby granted, free of charge, to any person obtaining a
11 * copy of this software and associated documentation files (the "Software"),
12 * to deal in the Software without restriction, including without limitation
13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
14 * and/or sell copies of the Software, and to permit persons to whom the
15 * Software is furnished to do so, subject to the following conditions:
16 *
17 * The above copyright notice and this permission notice shall be included
18 * in all copies or substantial portions of the Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
21 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * PAWEL W. OLSZTA BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
24 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
25 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 */
27
28 #include "freeglut.h"
29 #include "freeglut_internal.h"
30
31 /*
32 * TODO BEFORE THE STABLE RELEASE:
33 *
34 * Test things out ...
35 */
36
37 /* -- IMPORT DECLARATIONS -------------------------------------------------- */
38
39 /*
40 * These are the font faces defined in freeglut_font_data.c file:
41 */
42 extern SFG_Font fgFontFixed8x13;
43 extern SFG_Font fgFontFixed9x15;
44 extern SFG_Font fgFontHelvetica10;
45 extern SFG_Font fgFontHelvetica12;
46 extern SFG_Font fgFontHelvetica18;
47 extern SFG_Font fgFontTimesRoman10;
48 extern SFG_Font fgFontTimesRoman24;
49 extern SFG_StrokeFont fgStrokeRoman;
50 extern SFG_StrokeFont fgStrokeMonoRoman;
51
52
53 /* -- PRIVATE FUNCTIONS ---------------------------------------------------- */
54
55 /*
56 * Matches a font ID with a SFG_Font structure pointer.
57 * This was changed to match the GLUT header style.
58 */
fghFontByID(void * font)59 static SFG_Font* fghFontByID( void* font )
60 {
61 if( font == GLUT_BITMAP_8_BY_13 )
62 return &fgFontFixed8x13;
63 if( font == GLUT_BITMAP_9_BY_15 )
64 return &fgFontFixed9x15;
65 if( font == GLUT_BITMAP_HELVETICA_10 )
66 return &fgFontHelvetica10;
67 if( font == GLUT_BITMAP_HELVETICA_12 )
68 return &fgFontHelvetica12;
69 if( font == GLUT_BITMAP_HELVETICA_18 )
70 return &fgFontHelvetica18;
71 if( font == GLUT_BITMAP_TIMES_ROMAN_10 )
72 return &fgFontTimesRoman10;
73 if( font == GLUT_BITMAP_TIMES_ROMAN_24 )
74 return &fgFontTimesRoman24;
75
76 fgWarning( "font 0x%08x not found", font );
77 return 0;
78 }
79
80 /*
81 * Matches a font ID with a SFG_StrokeFont structure pointer.
82 * This was changed to match the GLUT header style.
83 */
fghStrokeByID(void * font)84 static SFG_StrokeFont* fghStrokeByID( void* font )
85 {
86 if( font == GLUT_STROKE_ROMAN )
87 return &fgStrokeRoman;
88 if( font == GLUT_STROKE_MONO_ROMAN )
89 return &fgStrokeMonoRoman;
90
91 fgWarning( "stroke font 0x%08x not found", font );
92 return 0;
93 }
94
95
96 /* -- INTERFACE FUNCTIONS -------------------------------------------------- */
97
98 /*
99 * Draw a bitmap character
100 */
glutBitmapCharacter(void * fontID,int character)101 void FGAPIENTRY glutBitmapCharacter( void* fontID, int character )
102 {
103 const GLubyte* face;
104 SFG_Font* font;
105 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutBitmapCharacter" );
106 font = fghFontByID( fontID );
107 freeglut_return_if_fail( ( character >= 1 )&&( character < 256 ) );
108 freeglut_return_if_fail( font );
109
110 /*
111 * Find the character we want to draw (???)
112 */
113 face = font->Characters[ character ];
114
115 glPushClientAttrib( GL_CLIENT_PIXEL_STORE_BIT );
116 glPixelStorei( GL_UNPACK_SWAP_BYTES, GL_FALSE );
117 glPixelStorei( GL_UNPACK_LSB_FIRST, GL_FALSE );
118 glPixelStorei( GL_UNPACK_ROW_LENGTH, 0 );
119 glPixelStorei( GL_UNPACK_SKIP_ROWS, 0 );
120 glPixelStorei( GL_UNPACK_SKIP_PIXELS, 0 );
121 glPixelStorei( GL_UNPACK_ALIGNMENT, 1 );
122 glBitmap(
123 face[ 0 ], font->Height, /* The bitmap's width and height */
124 font->xorig, font->yorig, /* The origin in the font glyph */
125 ( float )( face[ 0 ] ), 0.0, /* The raster advance -- inc. x,y */
126 ( face + 1 ) /* The packed bitmap data... */
127 );
128 glPopClientAttrib( );
129 }
130
glutBitmapString(void * fontID,const unsigned char * string)131 void FGAPIENTRY glutBitmapString( void* fontID, const unsigned char *string )
132 {
133 unsigned char c;
134 float x = 0.0f ;
135 SFG_Font* font;
136 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutBitmapString" );
137 font = fghFontByID( fontID );
138 freeglut_return_if_fail( font );
139 if ( !string || ! *string )
140 return;
141
142 glPushClientAttrib( GL_CLIENT_PIXEL_STORE_BIT );
143 glPixelStorei( GL_UNPACK_SWAP_BYTES, GL_FALSE );
144 glPixelStorei( GL_UNPACK_LSB_FIRST, GL_FALSE );
145 glPixelStorei( GL_UNPACK_ROW_LENGTH, 0 );
146 glPixelStorei( GL_UNPACK_SKIP_ROWS, 0 );
147 glPixelStorei( GL_UNPACK_SKIP_PIXELS, 0 );
148 glPixelStorei( GL_UNPACK_ALIGNMENT, 1 );
149
150 /*
151 * Step through the string, drawing each character.
152 * A newline will simply translate the next character's insertion
153 * point back to the start of the line and down one line.
154 */
155 while( ( c = *string++) )
156 if( c == '\n' )
157 {
158 glBitmap ( 0, 0, 0, 0, -x, (float) -font->Height, NULL );
159 x = 0.0f;
160 }
161 else /* Not an EOL, draw the bitmap character */
162 {
163 const GLubyte* face = font->Characters[ c ];
164
165 glBitmap(
166 face[ 0 ], font->Height, /* Bitmap's width and height */
167 font->xorig, font->yorig, /* The origin in the font glyph */
168 ( float )( face[ 0 ] ), 0.0, /* The raster advance; inc. x,y */
169 ( face + 1 ) /* The packed bitmap data... */
170 );
171
172 x += ( float )( face[ 0 ] );
173 }
174
175 glPopClientAttrib( );
176 }
177
178 /*
179 * Returns the width in pixels of a font's character
180 */
glutBitmapWidth(void * fontID,int character)181 int FGAPIENTRY glutBitmapWidth( void* fontID, int character )
182 {
183 SFG_Font* font;
184 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutBitmapWidth" );
185 font = fghFontByID( fontID );
186 freeglut_return_val_if_fail( character > 0 && character < 256, 0 );
187 freeglut_return_val_if_fail( font, 0 );
188 return *( font->Characters[ character ] );
189 }
190
191 /*
192 * Return the width of a string drawn using a bitmap font
193 */
glutBitmapLength(void * fontID,const unsigned char * string)194 int FGAPIENTRY glutBitmapLength( void* fontID, const unsigned char* string )
195 {
196 unsigned char c;
197 int length = 0, this_line_length = 0;
198 SFG_Font* font;
199 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutBitmapLength" );
200 font = fghFontByID( fontID );
201 freeglut_return_val_if_fail( font, 0 );
202 if ( !string || ! *string )
203 return 0;
204
205 while( ( c = *string++) )
206 {
207 if( c != '\n' )/* Not an EOL, increment length of line */
208 this_line_length += *( font->Characters[ c ]);
209 else /* EOL; reset the length of this line */
210 {
211 if( length < this_line_length )
212 length = this_line_length;
213 this_line_length = 0;
214 }
215 }
216 if ( length < this_line_length )
217 length = this_line_length;
218
219 return length;
220 }
221
222 /*
223 * Returns the height of a bitmap font
224 */
glutBitmapHeight(void * fontID)225 int FGAPIENTRY glutBitmapHeight( void* fontID )
226 {
227 SFG_Font* font;
228 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutBitmapHeight" );
229 font = fghFontByID( fontID );
230 freeglut_return_val_if_fail( font, 0 );
231 return font->Height;
232 }
233
234 /*
235 * Draw a stroke character
236 */
glutStrokeCharacter(void * fontID,int character)237 void FGAPIENTRY glutStrokeCharacter( void* fontID, int character )
238 {
239 const SFG_StrokeChar *schar;
240 const SFG_StrokeStrip *strip;
241 int i, j;
242 SFG_StrokeFont* font;
243 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutStrokeCharacter" );
244 font = fghStrokeByID( fontID );
245 freeglut_return_if_fail( character >= 0 );
246 freeglut_return_if_fail( character < font->Quantity );
247 freeglut_return_if_fail( font );
248
249 schar = font->Characters[ character ];
250 freeglut_return_if_fail( schar );
251 strip = schar->Strips;
252
253 for( i = 0; i < schar->Number; i++, strip++ )
254 {
255 glBegin( GL_LINE_STRIP );
256 for( j = 0; j < strip->Number; j++ )
257 glVertex2f( strip->Vertices[ j ].X, strip->Vertices[ j ].Y );
258 glEnd( );
259 glBegin( GL_POINTS );
260 for( j = 0; j < strip->Number; j++ )
261 glVertex2f( strip->Vertices[ j ].X, strip->Vertices[ j ].Y );
262 glEnd( );
263 }
264 glTranslatef( schar->Right, 0.0, 0.0 );
265 }
266
glutStrokeString(void * fontID,const unsigned char * string)267 void FGAPIENTRY glutStrokeString( void* fontID, const unsigned char *string )
268 {
269 unsigned char c;
270 int i, j;
271 float length = 0.0;
272 SFG_StrokeFont* font;
273 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutStrokeString" );
274 font = fghStrokeByID( fontID );
275 freeglut_return_if_fail( font );
276 if ( !string || ! *string )
277 return;
278
279 /*
280 * Step through the string, drawing each character.
281 * A newline will simply translate the next character's insertion
282 * point back to the start of the line and down one line.
283 */
284 while( ( c = *string++) )
285 if( c < font->Quantity )
286 {
287 if( c == '\n' )
288 {
289 glTranslatef ( -length, -( float )( font->Height ), 0.0 );
290 length = 0.0;
291 }
292 else /* Not an EOL, draw the bitmap character */
293 {
294 const SFG_StrokeChar *schar = font->Characters[ c ];
295 if( schar )
296 {
297 const SFG_StrokeStrip *strip = schar->Strips;
298
299 for( i = 0; i < schar->Number; i++, strip++ )
300 {
301 glBegin( GL_LINE_STRIP );
302 for( j = 0; j < strip->Number; j++ )
303 glVertex2f( strip->Vertices[ j ].X,
304 strip->Vertices[ j ].Y);
305
306 glEnd( );
307 }
308
309 length += schar->Right;
310 glTranslatef( schar->Right, 0.0, 0.0 );
311 }
312 }
313 }
314 }
315
316 /*
317 * Return the width in pixels of a stroke character
318 */
glutStrokeWidth(void * fontID,int character)319 int FGAPIENTRY glutStrokeWidth( void* fontID, int character )
320 {
321 const SFG_StrokeChar *schar;
322 SFG_StrokeFont* font;
323 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutStrokeWidth" );
324 font = fghStrokeByID( fontID );
325 freeglut_return_val_if_fail( ( character >= 0 ) &&
326 ( character < font->Quantity ),
327 0
328 );
329 freeglut_return_val_if_fail( font, 0 );
330 schar = font->Characters[ character ];
331 freeglut_return_val_if_fail( schar, 0 );
332
333 return ( int )( schar->Right + 0.5 );
334 }
335
336 /*
337 * Return the width of a string drawn using a stroke font
338 */
glutStrokeLength(void * fontID,const unsigned char * string)339 int FGAPIENTRY glutStrokeLength( void* fontID, const unsigned char* string )
340 {
341 unsigned char c;
342 float length = 0.0;
343 float this_line_length = 0.0;
344 SFG_StrokeFont* font;
345 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutStrokeLength" );
346 font = fghStrokeByID( fontID );
347 freeglut_return_val_if_fail( font, 0 );
348 if ( !string || ! *string )
349 return 0;
350
351 while( ( c = *string++) )
352 if( c < font->Quantity )
353 {
354 if( c == '\n' ) /* EOL; reset the length of this line */
355 {
356 if( length < this_line_length )
357 length = this_line_length;
358 this_line_length = 0.0;
359 }
360 else /* Not an EOL, increment the length of this line */
361 {
362 const SFG_StrokeChar *schar = font->Characters[ c ];
363 if( schar )
364 this_line_length += schar->Right;
365 }
366 }
367 if( length < this_line_length )
368 length = this_line_length;
369 return( int )( length + 0.5 );
370 }
371
372 /*
373 * Returns the height of a stroke font
374 */
glutStrokeHeight(void * fontID)375 GLfloat FGAPIENTRY glutStrokeHeight( void* fontID )
376 {
377 SFG_StrokeFont* font;
378 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutStrokeHeight" );
379 font = fghStrokeByID( fontID );
380 freeglut_return_val_if_fail( font, 0.0 );
381 return font->Height;
382 }
383
384 /*** END OF FILE ***/
385