-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathSDL_ttf.c
2242 lines (1982 loc) · 66.7 KB
/
SDL_ttf.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
SDL_ttf: A companion library to SDL for working with TrueType (tm) fonts
Copyright (C) 2001-2017 Sam Lantinga <[email protected]>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_OUTLINE_H
#include FT_STROKER_H
#include FT_GLYPH_H
#include FT_TRUETYPE_IDS_H
#include "SDL.h"
#include "SDL_endian.h"
#include "SDL_ttf.h"
/* FIXME: Right now we assume the gray-scale renderer Freetype is using
supports 256 shades of gray, but we should instead key off of num_grays
in the result FT_Bitmap after the FT_Render_Glyph() call. */
#define NUM_GRAYS 256
/* Handy routines for converting from fixed point */
#define FT_FLOOR(X) ((X & -64) / 64)
#define FT_CEIL(X) (((X + 63) & -64) / 64)
#define CACHED_METRICS 0x10
#define CACHED_BITMAP 0x01
#define CACHED_PIXMAP 0x02
/* Cached glyph information */
typedef struct cached_glyph {
int stored;
FT_UInt index;
FT_Bitmap bitmap;
FT_Bitmap pixmap;
int minx;
int maxx;
int miny;
int maxy;
int yoffset;
int advance;
Uint16 cached;
} c_glyph;
/* The structure used to hold internal font information */
struct _TTF_Font {
/* Freetype2 maintains all sorts of useful info itself */
FT_Face face;
/* We'll cache these ourselves */
int height;
int ascent;
int descent;
int lineskip;
/* The font style */
int face_style;
int style;
int outline;
/* Whether kerning is desired */
int kerning;
/* Extra width in glyph bounds for text styles */
int glyph_overhang;
float glyph_italics;
/* Information in the font for underlining */
int underline_offset;
int underline_height;
/* Cache for style-transformed glyphs */
c_glyph *current;
c_glyph cache[257]; /* 257 is a prime */
/* We are responsible for closing the font stream */
SDL_RWops *src;
int freesrc;
FT_Open_Args args;
/* For non-scalable formats, we must remember which font index size */
int font_size_family;
/* really just flags passed into FT_Load_Glyph */
int hinting;
};
/* Handle a style only if the font does not already handle it */
#define TTF_HANDLE_STYLE_BOLD(font) (((font)->style & TTF_STYLE_BOLD) && \
!((font)->face_style & TTF_STYLE_BOLD))
#define TTF_HANDLE_STYLE_ITALIC(font) (((font)->style & TTF_STYLE_ITALIC) && \
!((font)->face_style & TTF_STYLE_ITALIC))
#define TTF_HANDLE_STYLE_UNDERLINE(font) ((font)->style & TTF_STYLE_UNDERLINE)
#define TTF_HANDLE_STYLE_STRIKETHROUGH(font) ((font)->style & TTF_STYLE_STRIKETHROUGH)
/* Font styles that does not impact glyph drawing */
#define TTF_STYLE_NO_GLYPH_CHANGE (TTF_STYLE_UNDERLINE | TTF_STYLE_STRIKETHROUGH)
/* The FreeType font engine/library */
static FT_Library library;
static int TTF_initialized = 0;
static int TTF_byteswapped = 0;
#define TTF_CHECKPOINTER(p, errval) \
if ( !TTF_initialized ) { \
TTF_SetError("Library not initialized"); \
return errval; \
} \
if ( !p ) { \
TTF_SetError("Passed a NULL pointer"); \
return errval; \
}
/* Gets the top row of the underline. The outline
is taken into account.
*/
static int TTF_underline_top_row(TTF_Font *font)
{
/* With outline, the underline_offset is underline_offset+outline. */
/* So, we don't have to remove the top part of the outline height. */
return font->ascent - font->underline_offset - 1;
}
/* Gets the top row of the underline. for a given glyph. The outline
is taken into account.
Need to update row according to height difference between font and glyph:
font_value - font->ascent + glyph->maxy
*/
static int TTF_Glyph_underline_top_row(TTF_Font *font, c_glyph *glyph)
{
return glyph->maxy - font->underline_offset - 1;
}
/* Gets the bottom row of the underline. The outline
is taken into account.
*/
static int TTF_underline_bottom_row(TTF_Font *font)
{
int row = TTF_underline_top_row(font) + font->underline_height;
if ( font->outline > 0 ) {
/* Add underline_offset outline offset and */
/* the bottom part of the outline. */
row += font->outline * 2;
}
return row;
}
/* Gets the bottom row of the underline. for a given glyph. The outline
is taken into account.
Need to update row according to height difference between font and glyph:
font_value - font->ascent + glyph->maxy
*/
static int TTF_Glyph_underline_bottom_row(TTF_Font *font, c_glyph *glyph)
{
return TTF_underline_bottom_row(font) - font->ascent + glyph->maxy;
}
/* Gets the top row of the strikethrough. The outline
is taken into account.
*/
static int TTF_strikethrough_top_row(TTF_Font *font)
{
/* With outline, the first text row is 'outline'. */
/* So, we don't have to remove the top part of the outline height. */
return font->height / 2;
}
/* Gets the top row of the strikethrough for a given glyph. The outline
is taken into account.
Need to update row according to height difference between font and glyph:
font_value - font->ascent + glyph->maxy
*/
static int TTF_Glyph_strikethrough_top_row(TTF_Font *font, c_glyph *glyph)
{
return TTF_strikethrough_top_row(font) - font->ascent + glyph->maxy;
}
static void TTF_initLineMectrics(const TTF_Font *font, const SDL_Surface *textbuf, const int row, Uint8 **pdst, int *pheight)
{
Uint8 *dst;
int height;
dst = (Uint8 *)textbuf->pixels;
if ( row > 0 ) {
dst += row * textbuf->pitch;
}
height = font->underline_height;
/* Take outline into account */
if ( font->outline > 0 ) {
height += font->outline * 2;
}
*pdst = dst;
*pheight = height;
}
/* Draw a solid line of underline_height (+ optional outline)
at the given row. The row value must take the
outline into account.
*/
static void TTF_drawLine_Solid(const TTF_Font *font, const SDL_Surface *textbuf, const int row)
{
int line;
Uint8 *dst_check = (Uint8*)textbuf->pixels + textbuf->pitch * textbuf->h;
Uint8 *dst;
int height;
TTF_initLineMectrics(font, textbuf, row, &dst, &height);
/* Draw line */
for ( line=height; line>0 && dst < dst_check; --line ) {
/* 1 because 0 is the bg color */
SDL_memset( dst, 1, textbuf->w );
dst += textbuf->pitch;
}
}
/* Draw a shaded line of underline_height (+ optional outline)
at the given row. The row value must take the
outline into account.
*/
static void TTF_drawLine_Shaded(const TTF_Font *font, const SDL_Surface *textbuf, const int row)
{
int line;
Uint8 *dst_check = (Uint8*)textbuf->pixels + textbuf->pitch * textbuf->h;
Uint8 *dst;
int height;
TTF_initLineMectrics(font, textbuf, row, &dst, &height);
/* Draw line */
for ( line=height; line>0 && dst < dst_check; --line ) {
SDL_memset( dst, NUM_GRAYS - 1, textbuf->w );
dst += textbuf->pitch;
}
}
/* Draw a blended line of underline_height (+ optional outline)
at the given row. The row value must take the
outline into account.
*/
static void TTF_drawLine_Blended(const TTF_Font *font, const SDL_Surface *textbuf, const int row, const Uint32 color)
{
int line;
Uint32 *dst_check = (Uint32*)textbuf->pixels + textbuf->pitch/4 * textbuf->h;
Uint8 *dst8; /* destination, byte version */
Uint32 *dst;
int height;
int col;
Uint32 pixel = color | 0xFF000000; /* Amask */
TTF_initLineMectrics(font, textbuf, row, &dst8, &height);
dst = (Uint32 *) dst8;
/* Draw line */
for ( line=height; line>0 && dst < dst_check; --line ) {
for ( col=0; col < textbuf->w; ++col ) {
dst[col] = pixel;
}
dst += textbuf->pitch/4;
}
}
/* rcg06192001 get linked library's version. */
const SDL_version *TTF_Linked_Version(void)
{
static SDL_version linked_version;
SDL_TTF_VERSION(&linked_version);
return(&linked_version);
}
/* This function tells the library whether UNICODE text is generally
byteswapped. A UNICODE BOM character at the beginning of a string
will override this setting for that string.
*/
void TTF_ByteSwappedUNICODE(int swapped)
{
TTF_byteswapped = swapped;
}
static void TTF_SetFTError(const char *msg, FT_Error error)
{
#ifdef USE_FREETYPE_ERRORS
#undef FTERRORS_H
#define FT_ERRORDEF( e, v, s ) { e, s },
static const struct
{
int err_code;
const char* err_msg;
} ft_errors[] = {
#include <freetype/fterrors.h>
};
int i;
const char *err_msg;
char buffer[1024];
err_msg = NULL;
for ( i=0; i<((sizeof ft_errors)/(sizeof ft_errors[0])); ++i ) {
if ( error == ft_errors[i].err_code ) {
err_msg = ft_errors[i].err_msg;
break;
}
}
if ( ! err_msg ) {
err_msg = "unknown FreeType error";
}
TTF_SetError("%s: %s", msg, err_msg);
#else
TTF_SetError("%s", msg);
#endif /* USE_FREETYPE_ERRORS */
}
int TTF_Init( void )
{
int status = 0;
if ( ! TTF_initialized ) {
FT_Error error = FT_Init_FreeType( &library );
if ( error ) {
TTF_SetFTError("Couldn't init FreeType engine", error);
status = -1;
}
}
if ( status == 0 ) {
++TTF_initialized;
}
return status;
}
static unsigned long RWread(
FT_Stream stream,
unsigned long offset,
unsigned char* buffer,
unsigned long count
)
{
SDL_RWops *src;
src = (SDL_RWops *)stream->descriptor.pointer;
SDL_RWseek( src, (int)offset, RW_SEEK_SET );
if ( count == 0 ) {
return 0;
}
return (unsigned long)SDL_RWread( src, buffer, 1, (int)count );
}
TTF_Font* TTF_OpenFontIndexRW( SDL_RWops *src, int freesrc, int ptsize, long index )
{
TTF_Font* font;
FT_Error error;
FT_Face face;
FT_Fixed scale;
FT_Stream stream;
FT_CharMap found;
Sint64 position;
int i;
if ( ! TTF_initialized ) {
TTF_SetError( "Library not initialized" );
if ( src && freesrc ) {
SDL_RWclose( src );
}
return NULL;
}
if ( ! src ) {
TTF_SetError( "Passed a NULL font source" );
return NULL;
}
/* Check to make sure we can seek in this stream */
position = SDL_RWtell(src);
if ( position < 0 ) {
TTF_SetError( "Can't seek in stream" );
if ( freesrc ) {
SDL_RWclose( src );
}
return NULL;
}
font = (TTF_Font*)SDL_malloc(sizeof *font);
if ( font == NULL ) {
TTF_SetError( "Out of memory" );
if ( freesrc ) {
SDL_RWclose( src );
}
return NULL;
}
SDL_memset(font, 0, sizeof(*font));
font->src = src;
font->freesrc = freesrc;
stream = (FT_Stream)SDL_malloc(sizeof(*stream));
if ( stream == NULL ) {
TTF_SetError( "Out of memory" );
TTF_CloseFont( font );
return NULL;
}
SDL_memset(stream, 0, sizeof(*stream));
stream->read = RWread;
stream->descriptor.pointer = src;
stream->pos = (unsigned long)position;
stream->size = (unsigned long)(SDL_RWsize(src) - position);
font->args.flags = FT_OPEN_STREAM;
font->args.stream = stream;
error = FT_Open_Face( library, &font->args, index, &font->face );
if ( error ) {
TTF_SetFTError( "Couldn't load font file", error );
TTF_CloseFont( font );
return NULL;
}
face = font->face;
/* Set charmap for loaded font */
found = 0;
for (i = 0; i < face->num_charmaps; i++) {
FT_CharMap charmap = face->charmaps[i];
if ((charmap->platform_id == 3 && charmap->encoding_id == 1) /* Windows Unicode */
|| (charmap->platform_id == 3 && charmap->encoding_id == 0) /* Windows Symbol */
|| (charmap->platform_id == 2 && charmap->encoding_id == 1) /* ISO Unicode */
|| (charmap->platform_id == 0)) { /* Apple Unicode */
found = charmap;
break;
}
}
if ( found ) {
/* If this fails, continue using the default charmap */
FT_Set_Charmap(face, found);
}
/* Make sure that our font face is scalable (global metrics) */
if ( FT_IS_SCALABLE(face) ) {
/* Set the character size and use default DPI (72) */
error = FT_Set_Char_Size( font->face, 0, ptsize * 64, 0, 0 );
if ( error ) {
TTF_SetFTError( "Couldn't set font size", error );
TTF_CloseFont( font );
return NULL;
}
/* Get the scalable font metrics for this font */
scale = face->size->metrics.y_scale;
font->ascent = FT_CEIL(FT_MulFix(face->ascender, scale));
font->descent = FT_CEIL(FT_MulFix(face->descender, scale));
font->height = font->ascent - font->descent + /* baseline */ 1;
font->lineskip = FT_CEIL(FT_MulFix(face->height, scale));
font->underline_offset = FT_FLOOR(FT_MulFix(face->underline_position, scale));
font->underline_height = FT_FLOOR(FT_MulFix(face->underline_thickness, scale));
} else {
/* Non-scalable font case. ptsize determines which family
* or series of fonts to grab from the non-scalable format.
* It is not the point size of the font.
* */
if ( ptsize >= font->face->num_fixed_sizes )
ptsize = font->face->num_fixed_sizes - 1;
font->font_size_family = ptsize;
error = FT_Set_Pixel_Sizes( face,
face->available_sizes[ptsize].width,
face->available_sizes[ptsize].height );
/* With non-scalale fonts, Freetype2 likes to fill many of the
* font metrics with the value of 0. The size of the
* non-scalable fonts must be determined differently
* or sometimes cannot be determined.
* */
font->ascent = face->available_sizes[ptsize].height;
font->descent = 0;
font->height = face->available_sizes[ptsize].height;
font->lineskip = FT_CEIL(font->ascent);
font->underline_offset = FT_FLOOR(face->underline_position);
font->underline_height = FT_FLOOR(face->underline_thickness);
}
if ( font->underline_height < 1 ) {
font->underline_height = 1;
}
#ifdef DEBUG_FONTS
printf("Font metrics:\n");
printf("\tascent = %d, descent = %d\n",
font->ascent, font->descent);
printf("\theight = %d, lineskip = %d\n",
font->height, font->lineskip);
printf("\tunderline_offset = %d, underline_height = %d\n",
font->underline_offset, font->underline_height);
printf("\tunderline_top_row = %d, strikethrough_top_row = %d\n",
TTF_underline_top_row(font), TTF_strikethrough_top_row(font));
#endif
/* Initialize the font face style */
font->face_style = TTF_STYLE_NORMAL;
if ( font->face->style_flags & FT_STYLE_FLAG_BOLD ) {
font->face_style |= TTF_STYLE_BOLD;
}
if ( font->face->style_flags & FT_STYLE_FLAG_ITALIC ) {
font->face_style |= TTF_STYLE_ITALIC;
}
/* Set the default font style */
font->style = font->face_style;
font->outline = 0;
font->kerning = 1;
font->glyph_overhang = face->size->metrics.y_ppem / 10;
/* x offset = cos(((90.0-12)/360)*2*M_PI), or 12 degree angle */
font->glyph_italics = 0.207f;
font->glyph_italics *= font->height;
return font;
}
TTF_Font* TTF_OpenFontRW( SDL_RWops *src, int freesrc, int ptsize )
{
return TTF_OpenFontIndexRW(src, freesrc, ptsize, 0);
}
TTF_Font* TTF_OpenFontIndex( const char *file, int ptsize, long index )
{
SDL_RWops *rw = SDL_RWFromFile(file, "rb");
if ( rw == NULL ) {
return NULL;
}
return TTF_OpenFontIndexRW(rw, 1, ptsize, index);
}
TTF_Font* TTF_OpenFont( const char *file, int ptsize )
{
return TTF_OpenFontIndex(file, ptsize, 0);
}
static void Flush_Glyph( c_glyph* glyph )
{
glyph->stored = 0;
glyph->index = 0;
if ( glyph->bitmap.buffer ) {
SDL_free( glyph->bitmap.buffer );
glyph->bitmap.buffer = 0;
}
if ( glyph->pixmap.buffer ) {
SDL_free( glyph->pixmap.buffer );
glyph->pixmap.buffer = 0;
}
glyph->cached = 0;
}
static void Flush_Cache( TTF_Font* font )
{
int i;
int size = sizeof( font->cache ) / sizeof( font->cache[0] );
for ( i = 0; i < size; ++i ) {
if ( font->cache[i].cached ) {
Flush_Glyph( &font->cache[i] );
}
}
}
static FT_Error Load_Glyph( TTF_Font* font, Uint16 ch, c_glyph* cached, int want )
{
FT_Face face;
FT_Error error;
FT_GlyphSlot glyph;
FT_Glyph_Metrics* metrics;
FT_Outline* outline;
if ( !font || !font->face ) {
return FT_Err_Invalid_Handle;
}
face = font->face;
/* Load the glyph */
if ( ! cached->index ) {
cached->index = FT_Get_Char_Index( face, ch );
}
error = FT_Load_Glyph( face, cached->index, FT_LOAD_DEFAULT | font->hinting);
if ( error ) {
return error;
}
/* Get our glyph shortcuts */
glyph = face->glyph;
metrics = &glyph->metrics;
outline = &glyph->outline;
/* Get the glyph metrics if desired */
if ( (want & CACHED_METRICS) && !(cached->stored & CACHED_METRICS) ) {
if ( FT_IS_SCALABLE( face ) ) {
/* Get the bounding box */
cached->minx = FT_FLOOR(metrics->horiBearingX);
cached->maxx = FT_CEIL(metrics->horiBearingX + metrics->width);
cached->maxy = FT_FLOOR(metrics->horiBearingY);
cached->miny = cached->maxy - FT_CEIL(metrics->height);
cached->yoffset = font->ascent - cached->maxy;
cached->advance = FT_CEIL(metrics->horiAdvance);
} else {
/* Get the bounding box for non-scalable format.
* Again, freetype2 fills in many of the font metrics
* with the value of 0, so some of the values we
* need must be calculated differently with certain
* assumptions about non-scalable formats.
* */
cached->minx = FT_FLOOR(metrics->horiBearingX);
cached->maxx = FT_CEIL(metrics->horiBearingX + metrics->width);
cached->maxy = FT_FLOOR(metrics->horiBearingY);
cached->miny = cached->maxy - FT_CEIL(face->available_sizes[font->font_size_family].height);
cached->yoffset = 0;
cached->advance = FT_CEIL(metrics->horiAdvance);
}
/* Adjust for bold and italic text */
if ( TTF_HANDLE_STYLE_BOLD(font) ) {
cached->maxx += font->glyph_overhang;
}
if ( TTF_HANDLE_STYLE_ITALIC(font) ) {
cached->maxx += (int)SDL_ceil(font->glyph_italics);
}
cached->stored |= CACHED_METRICS;
}
if ( ((want & CACHED_BITMAP) && !(cached->stored & CACHED_BITMAP)) ||
((want & CACHED_PIXMAP) && !(cached->stored & CACHED_PIXMAP)) ) {
int mono = (want & CACHED_BITMAP);
int i;
FT_Bitmap* src;
FT_Bitmap* dst;
FT_Glyph bitmap_glyph = NULL;
/* Handle the italic style */
if ( TTF_HANDLE_STYLE_ITALIC(font) ) {
FT_Matrix shear;
shear.xx = 1 << 16;
shear.xy = (int) ( font->glyph_italics * ( 1 << 16 ) ) / font->height;
shear.yx = 0;
shear.yy = 1 << 16;
FT_Outline_Transform( outline, &shear );
}
/* Render as outline */
if ( (font->outline > 0) && glyph->format != FT_GLYPH_FORMAT_BITMAP ) {
FT_Stroker stroker;
FT_Get_Glyph( glyph, &bitmap_glyph );
error = FT_Stroker_New( library, &stroker );
if ( error ) {
return error;
}
FT_Stroker_Set( stroker, font->outline * 64, FT_STROKER_LINECAP_ROUND, FT_STROKER_LINEJOIN_ROUND, 0 );
FT_Glyph_Stroke( &bitmap_glyph, stroker, 1 /* delete the original glyph */ );
FT_Stroker_Done( stroker );
/* Render the glyph */
error = FT_Glyph_To_Bitmap( &bitmap_glyph, mono ? ft_render_mode_mono : ft_render_mode_normal, 0, 1 );
if ( error ) {
FT_Done_Glyph( bitmap_glyph );
return error;
}
src = &((FT_BitmapGlyph)bitmap_glyph)->bitmap;
} else {
/* Render the glyph */
error = FT_Render_Glyph( glyph, mono ? ft_render_mode_mono : ft_render_mode_normal );
if ( error ) {
return error;
}
src = &glyph->bitmap;
}
/* Copy over information to cache */
if ( mono ) {
dst = &cached->bitmap;
} else {
dst = &cached->pixmap;
}
SDL_memcpy( dst, src, sizeof( *dst ) );
/* FT_Render_Glyph() and .fon fonts always generate a
* two-color (black and white) glyphslot surface, even
* when rendered in ft_render_mode_normal. */
/* FT_IS_SCALABLE() means that the font is in outline format,
* but does not imply that outline is rendered as 8-bit
* grayscale, because embedded bitmap/graymap is preferred
* (see FT_LOAD_DEFAULT section of FreeType2 API Reference).
* FT_Render_Glyph() canreturn two-color bitmap or 4/16/256-
* color graymap according to the format of embedded bitmap/
* graymap. */
if ( src->pixel_mode == FT_PIXEL_MODE_MONO ) {
dst->pitch *= 8;
} else if ( src->pixel_mode == FT_PIXEL_MODE_GRAY2 ) {
dst->pitch *= 4;
} else if ( src->pixel_mode == FT_PIXEL_MODE_GRAY4 ) {
dst->pitch *= 2;
}
/* Adjust for bold and italic text */
if ( TTF_HANDLE_STYLE_BOLD(font) ) {
int bump = font->glyph_overhang;
dst->pitch += bump;
dst->width += bump;
}
if ( TTF_HANDLE_STYLE_ITALIC(font) ) {
int bump = (int)SDL_ceil(font->glyph_italics);
dst->pitch += bump;
dst->width += bump;
}
if (dst->rows != 0) {
dst->buffer = (unsigned char *)SDL_malloc( dst->pitch * dst->rows );
if ( !dst->buffer ) {
return FT_Err_Out_Of_Memory;
}
SDL_memset( dst->buffer, 0, dst->pitch * dst->rows );
for ( i = 0; i < src->rows; i++ ) {
int soffset = i * src->pitch;
int doffset = i * dst->pitch;
if ( mono ) {
unsigned char *srcp = src->buffer + soffset;
unsigned char *dstp = dst->buffer + doffset;
int j;
if ( src->pixel_mode == FT_PIXEL_MODE_MONO ) {
for ( j = 0; j < src->width; j += 8 ) {
unsigned char c = *srcp++;
*dstp++ = (c&0x80) >> 7;
c <<= 1;
*dstp++ = (c&0x80) >> 7;
c <<= 1;
*dstp++ = (c&0x80) >> 7;
c <<= 1;
*dstp++ = (c&0x80) >> 7;
c <<= 1;
*dstp++ = (c&0x80) >> 7;
c <<= 1;
*dstp++ = (c&0x80) >> 7;
c <<= 1;
*dstp++ = (c&0x80) >> 7;
c <<= 1;
*dstp++ = (c&0x80) >> 7;
}
} else if ( src->pixel_mode == FT_PIXEL_MODE_GRAY2 ) {
for ( j = 0; j < src->width; j += 4 ) {
unsigned char c = *srcp++;
*dstp++ = (((c&0xA0) >> 6) >= 0x2) ? 1 : 0;
c <<= 2;
*dstp++ = (((c&0xA0) >> 6) >= 0x2) ? 1 : 0;
c <<= 2;
*dstp++ = (((c&0xA0) >> 6) >= 0x2) ? 1 : 0;
c <<= 2;
*dstp++ = (((c&0xA0) >> 6) >= 0x2) ? 1 : 0;
}
} else if ( src->pixel_mode == FT_PIXEL_MODE_GRAY4 ) {
for ( j = 0; j < src->width; j += 2 ) {
unsigned char c = *srcp++;
*dstp++ = (((c&0xF0) >> 4) >= 0x8) ? 1 : 0;
c <<= 4;
*dstp++ = (((c&0xF0) >> 4) >= 0x8) ? 1 : 0;
}
} else {
for ( j = 0; j < src->width; j++ ) {
unsigned char c = *srcp++;
*dstp++ = (c >= 0x80) ? 1 : 0;
}
}
} else if ( src->pixel_mode == FT_PIXEL_MODE_MONO ) {
/* This special case wouldn't
* be here if the FT_Render_Glyph()
* function wasn't buggy when it tried
* to render a .fon font with 256
* shades of gray. Instead, it
* returns a black and white surface
* and we have to translate it back
* to a 256 gray shaded surface.
* */
unsigned char *srcp = src->buffer + soffset;
unsigned char *dstp = dst->buffer + doffset;
unsigned char c;
int j, k;
for ( j = 0; j < src->width; j += 8) {
c = *srcp++;
for (k = 0; k < 8; ++k) {
if ((c&0x80) >> 7) {
*dstp++ = NUM_GRAYS - 1;
} else {
*dstp++ = 0x00;
}
c <<= 1;
}
}
} else if ( src->pixel_mode == FT_PIXEL_MODE_GRAY2 ) {
unsigned char *srcp = src->buffer + soffset;
unsigned char *dstp = dst->buffer + doffset;
unsigned char c;
int j, k;
for ( j = 0; j < src->width; j += 4 ) {
c = *srcp++;
for ( k = 0; k < 4; ++k ) {
if ((c&0xA0) >> 6) {
*dstp++ = NUM_GRAYS * ((c&0xA0) >> 6) / 3 - 1;
} else {
*dstp++ = 0x00;
}
c <<= 2;
}
}
} else if ( src->pixel_mode == FT_PIXEL_MODE_GRAY4 ) {
unsigned char *srcp = src->buffer + soffset;
unsigned char *dstp = dst->buffer + doffset;
unsigned char c;
int j, k;
for ( j = 0; j < src->width; j += 2 ) {
c = *srcp++;
for ( k = 0; k < 2; ++k ) {
if ((c&0xF0) >> 4) {
*dstp++ = NUM_GRAYS * ((c&0xF0) >> 4) / 15 - 1;
} else {
*dstp++ = 0x00;
}
c <<= 4;
}
}
} else {
SDL_memcpy(dst->buffer+doffset,
src->buffer+soffset, src->pitch);
}
}
}
/* Handle the bold style */
if ( TTF_HANDLE_STYLE_BOLD(font) ) {
int row;
int col;
int offset;
int pixel;
Uint8* pixmap;
/* The pixmap is a little hard, we have to add and clamp */
for ( row = dst->rows - 1; row >= 0; --row ) {
pixmap = (Uint8*) dst->buffer + row * dst->pitch;
for ( offset=1; offset <= font->glyph_overhang; ++offset ) {
for ( col = dst->width - 1; col > 0; --col ) {
if ( mono ) {
pixmap[col] |= pixmap[col-1];
} else {
pixel = (pixmap[col] + pixmap[col-1]);
if ( pixel > NUM_GRAYS - 1 ) {
pixel = NUM_GRAYS - 1;
}
pixmap[col] = (Uint8) pixel;
}
}
}
}
}
/* Mark that we rendered this format */
if ( mono ) {
cached->stored |= CACHED_BITMAP;
} else {
cached->stored |= CACHED_PIXMAP;
}
/* Free outlined glyph */
if ( bitmap_glyph ) {
FT_Done_Glyph( bitmap_glyph );
}
}
/* We're done, mark this glyph cached */
cached->cached = ch;
return 0;
}
static FT_Error Find_Glyph( TTF_Font* font, Uint16 ch, int want )
{
int retval = 0;
int hsize = sizeof( font->cache ) / sizeof( font->cache[0] );
int h = ch % hsize;
font->current = &font->cache[h];
if (font->current->cached != ch)
Flush_Glyph( font->current );
if ( (font->current->stored & want) != want ) {
retval = Load_Glyph( font, ch, font->current, want );
}
return retval;
}
void TTF_CloseFont( TTF_Font* font )
{
if ( font ) {
Flush_Cache( font );
if ( font->face ) {
FT_Done_Face( font->face );
}
if ( font->args.stream ) {
SDL_free( font->args.stream );
}
if ( font->freesrc ) {
SDL_RWclose( font->src );
}
SDL_free( font );
}
}
/* Gets the number of bytes used by a null terminated UCS2 string */
static size_t UCS2_len(const Uint16 *text)
{
size_t count = 0;
while (*text++) {
++count;
}
return count * sizeof(*text);
}
/* Convert a Latin-1 string to a UTF-8 string */
static void LATIN1_to_UTF8(const char *src, Uint8 *dst)
{
while (*src) {
Uint8 ch = *(Uint8*)src++;
if (ch <= 0x7F) {
*dst++ = ch;
} else {
*dst++ = 0xC0 | ((ch >> 6) & 0x1F);
*dst++ = 0x80 | (ch & 0x3F);
}
}
*dst = '\0';
}
/* Convert a UCS-2 string to a UTF-8 string */
static void UCS2_to_UTF8(const Uint16 *src, Uint8 *dst)
{
int swapped = TTF_byteswapped;
while (*src) {
Uint16 ch = *(Uint16*)src++;
if (ch == UNICODE_BOM_NATIVE) {
swapped = 0;
continue;
}
if (ch == UNICODE_BOM_SWAPPED) {
swapped = 1;
continue;
}
if (swapped) {
ch = SDL_Swap16(ch);
}
if (ch <= 0x7F) {
*dst++ = (Uint8) ch;
} else if (ch <= 0x7FF) {
*dst++ = 0xC0 | (Uint8) ((ch >> 6) & 0x1F);
*dst++ = 0x80 | (Uint8) (ch & 0x3F);
} else {
*dst++ = 0xE0 | (Uint8) ((ch >> 12) & 0x0F);
*dst++ = 0x80 | (Uint8) ((ch >> 6) & 0x3F);
*dst++ = 0x80 | (Uint8) (ch & 0x3F);
}
}
*dst = '\0';
}
/* Gets a unicode value from a UTF-8 encoded string and advance the string */
#define UNKNOWN_UNICODE 0xFFFD
static Uint32 UTF8_getch(const char **src, size_t *srclen)
{
const Uint8 *p = *(const Uint8**)src;
size_t left = 0;
SDL_bool overlong = SDL_FALSE;
SDL_bool underflow = SDL_FALSE;
Uint32 ch = UNKNOWN_UNICODE;
if (*srclen == 0) {
return UNKNOWN_UNICODE;