1
2 /********************************************/
3 /* gd interface to freetype library */
4 /* */
5 /* John Ellson ellson@graphviz.org */
6 /********************************************/
7
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <string.h>
11 #include <math.h>
12 #include "gd.h"
13 #include "gdhelpers.h"
14
15 #ifndef MSWIN32
16 #include <unistd.h>
17 #else
18 #include <io.h>
19 #ifndef R_OK
20 # define R_OK 04 /* Needed in Windows */
21 #endif
22 #endif
23
24 #ifdef WIN32
25 #define access _access
26 #ifndef R_OK
27 #define R_OK 2
28 #endif
29 #endif
30
31 /* number of antialised colors for indexed bitmaps */
32 /* overwrite Windows GDI define in case of windows build */
33 #ifdef NUMCOLORS
34 #undef NUMCOLORS
35 #endif
36 #define NUMCOLORS 8
37
38 char *
gdImageStringTTF(gdImage * im,int * brect,int fg,char * fontlist,double ptsize,double angle,int x,int y,char * string)39 gdImageStringTTF (gdImage * im, int *brect, int fg, char *fontlist,
40 double ptsize, double angle, int x, int y, char *string)
41 {
42 /* 2.0.6: valid return */
43 return gdImageStringFT (im, brect, fg, fontlist, ptsize, angle, x, y, string);
44 }
45
46 #ifndef HAVE_LIBFREETYPE
47 char *
gdImageStringFTEx(gdImage * im,int * brect,int fg,char * fontlist,double ptsize,double angle,int x,int y,char * string,gdFTStringExtraPtr strex)48 gdImageStringFTEx (gdImage * im, int *brect, int fg, char *fontlist,
49 double ptsize, double angle, int x, int y, char *string,
50 gdFTStringExtraPtr strex)
51 {
52 return "libgd was not built with FreeType font support\n";
53 }
54
55 char *
gdImageStringFT(gdImage * im,int * brect,int fg,char * fontlist,double ptsize,double angle,int x,int y,char * string)56 gdImageStringFT (gdImage * im, int *brect, int fg, char *fontlist,
57 double ptsize, double angle, int x, int y, char *string)
58 {
59 return "libgd was not built with FreeType font support\n";
60 }
61 #else
62
63 #include "gdcache.h"
64 #include <ft2build.h>
65 #include FT_FREETYPE_H
66 #include FT_GLYPH_H
67
68 /* number of fonts cached before least recently used is replaced */
69 #define FONTCACHESIZE 6
70
71 /* number of antialias color lookups cached */
72 #define TWEENCOLORCACHESIZE 32
73
74 /*
75 * Line separation as a factor of font height.
76 * No space between if LINESPACE = 1.00
77 * Line separation will be rounded up to next pixel row.
78 */
79 #define LINESPACE 1.05
80
81 /*
82 * The character (space) used to separate alternate fonts in the
83 * fontlist parameter to gdImageStringFT. 2.0.18: space was a oor choice for this.
84 */
85 #define LISTSEPARATOR ";"
86
87 /*
88 * DEFAULT_FONTPATH and PATHSEPARATOR are host type dependent and
89 * are normally set by configure in config.h. These are just
90 * some last resort values that might match some Un*x system
91 * if building this version of gd separate from graphviz.
92 */
93 #ifndef DEFAULT_FONTPATH
94 #if defined(__APPLE__) || (defined(__MWERKS__) && defined(macintosh))
95 #define DEFAULT_FONTPATH "/usr/share/fonts/truetype:/System/Library/Fonts:/Library/Fonts"
96 #else
97 #define DEFAULT_FONTPATH "/usr/share/fonts/truetype"
98 #endif
99 #endif
100 #ifndef PATHSEPARATOR
101 #define PATHSEPARATOR ":"
102 #endif
103
104 #ifndef TRUE
105 #define FALSE 0
106 #define TRUE !FALSE
107 #endif
108
109 #ifndef MAX
110 #define MAX(a,b) ((a)>(b)?(a):(b))
111 #endif
112
113 #ifndef MIN
114 #define MIN(a,b) ((a)<(b)?(a):(b))
115 #endif
116
117 typedef struct
118 {
119 char *fontlist; /* key */
120 FT_Library *library;
121 FT_Face face;
122 FT_Bool have_char_map_unicode, have_char_map_big5, have_char_map_sjis, have_char_map_apple_roman;
123 gdCache_head_t *glyphCache;
124 } font_t;
125
126 typedef struct
127 {
128 char *fontlist; /* key */
129 int preferred_map;
130 FT_Library *library;
131 } fontkey_t;
132
133 typedef struct
134 {
135 int pixel; /* key */
136 int bgcolor; /* key */
137 int fgcolor; /* key *//* -ve means no antialias */
138 gdImagePtr im; /* key */
139 int tweencolor;
140 } tweencolor_t;
141
142 typedef struct
143 {
144 int pixel; /* key */
145 int bgcolor; /* key */
146 int fgcolor; /* key *//* -ve means no antialias */
147 gdImagePtr im; /* key */
148 } tweencolorkey_t;
149
150 /********************************************************************
151 * gdTcl_UtfToUniChar is borrowed from Tcl ...
152 */
153 /*
154 * tclUtf.c --
155 *
156 * Routines for manipulating UTF-8 strings.
157 *
158 * Copyright (c) 1997-1998 Sun Microsystems, Inc.
159 *
160 * See the file "license.terms" for information on usage and redistribution
161 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
162 *
163 * SCCS: @(#) tclUtf.c 1.25 98/01/28 18:02:43
164 */
165
166 /*
167 *---------------------------------------------------------------------------
168 *
169 * gdTcl_UtfToUniChar --
170 *
171 * Extract the Tcl_UniChar represented by the UTF-8 string. Bad
172 * UTF-8 sequences are converted to valid Tcl_UniChars and processing
173 * continues. Equivalent to Plan 9 chartorune().
174 *
175 * The caller must ensure that the source buffer is long enough that
176 * this routine does not run off the end and dereference non-existent
177 * memory looking for trail bytes. If the source buffer is known to
178 * be '\0' terminated, this cannot happen. Otherwise, the caller
179 * should call Tcl_UtfCharComplete() before calling this routine to
180 * ensure that enough bytes remain in the string.
181 *
182 * Results:
183 * *chPtr is filled with the Tcl_UniChar, and the return value is the
184 * number of bytes from the UTF-8 string that were consumed.
185 *
186 * Side effects:
187 * None.
188 *
189 *---------------------------------------------------------------------------
190 */
191
192 #ifdef JISX0208
193 #include "jisx0208.h"
194 #endif
195
196 extern int any2eucjp (char *, char *, unsigned int);
197
198 /* Persistent font cache until explicitly cleared */
199 /* Fonts can be used across multiple images */
200
201 /* 2.0.16: thread safety (the font cache is shared) */
202 gdMutexDeclare(gdFontCacheMutex);
203 static gdCache_head_t *fontCache = NULL;
204 static FT_Library library;
205
206 #define Tcl_UniChar int
207 #define TCL_UTF_MAX 3
gdTcl_UtfToUniChar(char * str,Tcl_UniChar * chPtr)208 static int gdTcl_UtfToUniChar (char *str, Tcl_UniChar * chPtr)
209 /* str is the UTF8 next character pointer */
210 /* chPtr is the int for the result */
211 {
212 int byte;
213
214 /* HTML4.0 entities in decimal form, e.g. Å */
215 byte = *((unsigned char *) str);
216 if (byte == '&') {
217 int i, n = 0;
218
219 byte = *((unsigned char *) (str + 1));
220 if (byte == '#') {
221 byte = *((unsigned char *) (str + 2));
222 if (byte == 'x' || byte == 'X') {
223 for (i = 3; i < 8; i++) {
224 byte = *((unsigned char *) (str + i));
225 if (byte >= 'A' && byte <= 'F')
226 byte = byte - 'A' + 10;
227 else if (byte >= 'a' && byte <= 'f')
228 byte = byte - 'a' + 10;
229 else if (byte >= '0' && byte <= '9')
230 byte = byte - '0';
231 else
232 break;
233 n = (n * 16) + byte;
234 }
235 } else {
236 for (i = 2; i < 8; i++) {
237 byte = *((unsigned char *) (str + i));
238 if (byte >= '0' && byte <= '9') {
239 n = (n * 10) + (byte - '0');
240 } else {
241 break;
242 }
243 }
244 }
245 if (byte == ';') {
246 *chPtr = (Tcl_UniChar) n;
247 return ++i;
248 }
249 }
250 }
251
252 /* Unroll 1 to 3 byte UTF-8 sequences, use loop to handle longer ones. */
253
254 byte = *((unsigned char *) str);
255 #ifdef JISX0208
256 if (0xA1 <= byte && byte <= 0xFE) {
257 int ku, ten;
258
259 ku = (byte & 0x7F) - 0x20;
260 ten = (str[1] & 0x7F) - 0x20;
261 if ((ku < 1 || ku > 92) || (ten < 1 || ten > 94)) {
262 *chPtr = (Tcl_UniChar) byte;
263 return 1;
264 }
265
266 *chPtr = (Tcl_UniChar) UnicodeTbl[ku - 1][ten - 1];
267 return 2;
268 } else
269 #endif /* JISX0208 */
270 if (byte < 0xC0) {
271 /* Handles properly formed UTF-8 characters between
272 * 0x01 and 0x7F. Also treats \0 and naked trail
273 * bytes 0x80 to 0xBF as valid characters representing
274 * themselves.
275 */
276
277 *chPtr = (Tcl_UniChar) byte;
278 return 1;
279 } else if (byte < 0xE0) {
280 if ((str[1] & 0xC0) == 0x80) {
281 /* Two-byte-character lead-byte followed by a trail-byte. */
282
283 *chPtr = (Tcl_UniChar) (((byte & 0x1F) << 6) | (str[1] & 0x3F));
284 return 2;
285 }
286 /*
287 * A two-byte-character lead-byte not followed by trail-byte
288 * represents itself.
289 */
290
291 *chPtr = (Tcl_UniChar) byte;
292 return 1;
293 } else if (byte < 0xF0) {
294 if (((str[1] & 0xC0) == 0x80) && ((str[2] & 0xC0) == 0x80)) {
295 /* Three-byte-character lead byte followed by two trail bytes. */
296
297 *chPtr = (Tcl_UniChar) (((byte & 0x0F) << 12) | ((str[1] & 0x3F) << 6) | (str[2] & 0x3F));
298 return 3;
299 }
300 /* A three-byte-character lead-byte not followed by two trail-bytes represents itself. */
301
302 *chPtr = (Tcl_UniChar) byte;
303 return 1;
304 }
305 #if TCL_UTF_MAX > 3
306 else {
307 int ch, total, trail;
308
309 total = totalBytes[byte];
310 trail = total - 1;
311
312 if (trail > 0) {
313 ch = byte & (0x3F >> trail);
314 do {
315 str++;
316 if ((*str & 0xC0) != 0x80) {
317 *chPtr = byte;
318 return 1;
319 }
320 ch <<= 6;
321 ch |= (*str & 0x3F);
322 trail--;
323 } while (trail > 0);
324 *chPtr = ch;
325 return total;
326 }
327 }
328 #endif
329
330 *chPtr = (Tcl_UniChar) byte;
331 return 1;
332 }
333
334 /********************************************************************/
335 /* font cache functions */
336
fontTest(void * element,void * key)337 static int fontTest (void *element, void *key)
338 {
339 font_t *a = (font_t *) element;
340 fontkey_t *b = (fontkey_t *) key;
341
342 if (strcmp (a->fontlist, b->fontlist) == 0) {
343 switch (b->preferred_map) {
344 case gdFTEX_Unicode:
345 if (a->have_char_map_unicode) {
346 return 1;
347 }
348 break;
349 case gdFTEX_Shift_JIS:
350 if (a->have_char_map_sjis) {
351 return 1;
352 }
353 break;
354 case gdFTEX_Big5:
355 if (a->have_char_map_sjis) {
356 return 1;
357 }
358 break;
359 }
360 }
361 return 0;
362 }
363
fontFetch(char ** error,void * key)364 static void *fontFetch (char **error, void *key)
365 {
366 font_t *a;
367 fontkey_t *b = (fontkey_t *) key;
368 int n;
369 int font_found = 0;
370 unsigned short platform, encoding;
371 char *fontsearchpath, *fontlist;
372 char fullname[MAXPATHLEN], cur_dir[MAXPATHLEN];
373 char *name, *path=NULL, *dir;
374 char *strtok_ptr;
375 FT_Error err;
376 FT_CharMap found = 0;
377 FT_CharMap charmap;
378
379 a = (font_t *) gdPMalloc(sizeof(font_t));
380 a->fontlist = gdPEstrdup(b->fontlist);
381 a->library = b->library;
382
383 /*
384 * Search the pathlist for any of a list of font names.
385 */
386 fontsearchpath = getenv ("GDFONTPATH");
387 if (!fontsearchpath) {
388 fontsearchpath = DEFAULT_FONTPATH;
389 }
390 fontlist = gdEstrdup(a->fontlist);
391
392 /*
393 * Must use gd_strtok_r becasuse strtok() isn't thread safe
394 */
395 for (name = gd_strtok_r (fontlist, LISTSEPARATOR, &strtok_ptr); name; name = gd_strtok_r (0, LISTSEPARATOR, &strtok_ptr)) {
396 char *strtok_ptr_path;
397 /* make a fresh copy each time - strtok corrupts it. */
398 path = gdEstrdup (fontsearchpath);
399
400 /* if name is an absolute filename then test directly */
401 #ifdef NETWARE
402 if (*name == '/' || (name[0] != 0 && strstr(name, ":/"))) {
403 #else
404 if (*name == '/' || (name[0] != 0 && name[1] == ':' && (name[2] == '/' || name[2] == '\\'))) {
405 #endif
406 snprintf(fullname, sizeof(fullname) - 1, "%s", name);
407 if (access(fullname, R_OK) == 0) {
408 font_found++;
409 break;
410 }
411 }
412 for (dir = gd_strtok_r (path, PATHSEPARATOR, &strtok_ptr_path); dir;
413 dir = gd_strtok_r (0, PATHSEPARATOR, &strtok_ptr_path)) {
414 if (!strcmp(dir, ".")) {
415 #if HAVE_GETCWD
416 dir = VCWD_GETCWD(cur_dir, MAXPATHLEN);
417 #elif HAVE_GETWD
418 dir = VCWD_GETWD(cur_dir);
419 #endif
420 if (!dir) {
421 continue;
422 }
423 }
424
425 #define GD_CHECK_FONT_PATH(ext) \
426 snprintf(fullname, sizeof(fullname) - 1, "%s/%s%s", dir, name, ext); \
427 if (access(fullname, R_OK) == 0) { \
428 font_found++; \
429 break; \
430 } \
431
432 GD_CHECK_FONT_PATH("");
433 GD_CHECK_FONT_PATH(".ttf");
434 GD_CHECK_FONT_PATH(".pfa");
435 GD_CHECK_FONT_PATH(".pfb");
436 GD_CHECK_FONT_PATH(".dfont");
437 }
438 gdFree(path);
439 path = NULL;
440 if (font_found) {
441 break;
442 }
443 }
444
445 if (path) {
446 gdFree(path);
447 }
448
449 gdFree(fontlist);
450
451 if (!font_found) {
452 gdPFree(a->fontlist);
453 gdPFree(a);
454 *error = "Could not find/open font";
455 return NULL;
456 }
457
458 err = FT_New_Face (*b->library, fullname, 0, &a->face);
459 if (err) {
460 gdPFree(a->fontlist);
461 gdPFree(a);
462 *error = "Could not read font";
463 return NULL;
464 }
465
466 /* FIXME - This mapping stuff is incomplete - where is the spec? */
467 /* EAM - It's worse than that. It's pointless to match character encodings here.
468 * As currently written, the stored a->face->charmap only matches one of
469 * the actual charmaps and we cannot know at this stage if it is the right
470 * one. We should just skip all this stuff, and check in gdImageStringFTEx
471 * if some particular charmap is preferred and if so whether it is held in
472 * one of the a->face->charmaps[0..num_charmaps].
473 * And why is it so bad not to find any recognized charmap? The user may
474 * still know what mapping to use, even if we do not. In that case we can
475 * just use the map in a->face->charmaps[num_charmaps] and be done with it.
476 */
477
478 for (n = 0; n < a->face->num_charmaps; n++) {
479 charmap = a->face->charmaps[n];
480 platform = charmap->platform_id;
481 encoding = charmap->encoding_id;
482
483 /* Whatever is the last value is what should be set */
484 a->have_char_map_unicode = 0;
485 a->have_char_map_big5 = 0;
486 a->have_char_map_sjis = 0;
487 a->have_char_map_apple_roman = 0;
488
489 /* EAM DEBUG - Newer versions of libfree2 make it easier by defining encodings */
490 #if (defined(FREETYPE_MAJOR) && ((FREETYPE_MAJOR == 2 && ((FREETYPE_MINOR == 1 && FREETYPE_PATCH >= 3) || FREETYPE_MINOR > 1) || FREETYPE_MAJOR > 2)))
491 if (charmap->encoding == FT_ENCODING_MS_SYMBOL
492 || charmap->encoding == FT_ENCODING_ADOBE_CUSTOM
493 || charmap->encoding == FT_ENCODING_ADOBE_STANDARD) {
494 a->have_char_map_unicode = 1;
495 found = charmap;
496 a->face->charmap = charmap;
497 return (void *)a;
498 }
499 #endif /* Freetype 2.1.3 or better */
500 /* EAM DEBUG */
501
502 if ((platform == 3 && encoding == 1) /* Windows Unicode */
503 || (platform == 3 && encoding == 0) /* Windows Symbol */
504 || (platform == 2 && encoding == 1) /* ISO Unicode */
505 || (platform == 0))
506 { /* Apple Unicode */
507 a->have_char_map_unicode = 1;
508 found = charmap;
509 if (b->preferred_map == gdFTEX_Unicode) {
510 break;
511 }
512 } else if (platform == 3 && encoding == 4) { /* Windows Big5 */
513 a->have_char_map_big5 = 1;
514 found = charmap;
515 if (b->preferred_map == gdFTEX_Big5) {
516 break;
517 }
518 } else if (platform == 3 && encoding == 2) { /* Windows Sjis */
519 a->have_char_map_sjis = 1;
520 found = charmap;
521 if (b->preferred_map == gdFTEX_Shift_JIS) {
522 break;
523 }
524 } else if ((platform == 1 && encoding == 0) /* Apple Roman */
525 || (platform == 2 && encoding == 0))
526 { /* ISO ASCII */
527 a->have_char_map_apple_roman = 1;
528 found = charmap;
529 if (b->preferred_map == gdFTEX_MacRoman) {
530 break;
531 }
532 }
533 }
534 if (!found) {
535 gdPFree(a->fontlist);
536 gdPFree(a);
537 *error = "Unable to find a CharMap that I can handle";
538 return NULL;
539 }
540
541 /* 2.0.5: we should actually return this */
542 a->face->charmap = found;
543 return (void *) a;
544 }
545
546 static void fontRelease (void *element)
547 {
548 font_t *a = (font_t *) element;
549
550 FT_Done_Face (a->face);
551 gdPFree(a->fontlist);
552 gdPFree((char *) element);
553 }
554
555 /********************************************************************/
556 /* tweencolor cache functions */
557
558 static int tweenColorTest (void *element, void *key)
559 {
560 tweencolor_t *a = (tweencolor_t *) element;
561 tweencolorkey_t *b = (tweencolorkey_t *) key;
562
563 return (a->pixel == b->pixel && a->bgcolor == b->bgcolor && a->fgcolor == b->fgcolor && a->im == b->im);
564 }
565
566 /*
567 * Computes a color in im's color table that is part way between
568 * the background and foreground colors proportional to the gray
569 * pixel value in the range 0-NUMCOLORS. The fg and bg colors must already
570 * be in the color table for palette images. For truecolor images the
571 * returned value simply has an alpha component and gdImageAlphaBlend
572 * does the work so that text can be alpha blended across a complex
573 * background (TBB; and for real in 2.0.2).
574 */
575 static void * tweenColorFetch (char **error, void *key)
576 {
577 tweencolor_t *a;
578 tweencolorkey_t *b = (tweencolorkey_t *) key;
579 int pixel, npixel, bg, fg;
580 gdImagePtr im;
581
582 a = (tweencolor_t *) gdMalloc (sizeof (tweencolor_t));
583 pixel = a->pixel = b->pixel;
584 bg = a->bgcolor = b->bgcolor;
585 fg = a->fgcolor = b->fgcolor;
586 im = a->im = b->im;
587
588 /* if fg is specified by a negative color idx, then don't antialias */
589 if (fg < 0) {
590 if ((pixel + pixel) >= NUMCOLORS) {
591 a->tweencolor = -fg;
592 } else {
593 a->tweencolor = bg;
594 }
595 } else {
596 npixel = NUMCOLORS - pixel;
597 if (im->trueColor) {
598 /* 2.0.1: use gdImageSetPixel to do the alpha blending work,
599 * or to just store the alpha level. All we have to do here
600 * is incorporate our knowledge of the percentage of this
601 * pixel that is really "lit" by pushing the alpha value
602 * up toward transparency in edge regions.
603 */
604 a->tweencolor = gdTrueColorAlpha(
605 gdTrueColorGetRed(fg),
606 gdTrueColorGetGreen(fg),
607 gdTrueColorGetBlue(fg),
608 gdAlphaMax - (gdTrueColorGetAlpha (fg) * pixel / NUMCOLORS));
609 } else {
610 a->tweencolor = gdImageColorResolve(im,
611 (pixel * im->red[fg] + npixel * im->red[bg]) / NUMCOLORS,
612 (pixel * im->green[fg] + npixel * im->green[bg]) / NUMCOLORS,
613 (pixel * im->blue[fg] + npixel * im->blue[bg]) / NUMCOLORS);
614 }
615 }
616 return (void *) a;
617 }
618
619 static void tweenColorRelease (void *element)
620 {
621 gdFree((char *) element);
622 }
623
624 /* draw_bitmap - transfers glyph bitmap to GD image */
625 static char * gdft_draw_bitmap (gdCache_head_t *tc_cache, gdImage * im, int fg, FT_Bitmap bitmap, int pen_x, int pen_y)
626 {
627 unsigned char *pixel = NULL;
628 int *tpixel = NULL;
629 int opixel;
630 int x, y, row, col, pc, pcr;
631
632 tweencolor_t *tc_elem;
633 tweencolorkey_t tc_key;
634
635 /* copy to image, mapping colors */
636 tc_key.fgcolor = fg;
637 tc_key.im = im;
638 /* Truecolor version; does not require the cache */
639 if (im->trueColor) {
640 for (row = 0; row < bitmap.rows; row++) {
641 pc = row * bitmap.pitch;
642 pcr = pc;
643 y = pen_y + row;
644 /* clip if out of bounds */
645 /* 2.0.16: clipping rectangle, not image bounds */
646 if ((y > im->cy2) || (y < im->cy1)) {
647 continue;
648 }
649 for (col = 0; col < bitmap.width; col++, pc++) {
650 int level;
651 if (bitmap.pixel_mode == ft_pixel_mode_grays) {
652 /* Scale to 128 levels of alpha for gd use.
653 * alpha 0 is opacity, so be sure to invert at the end
654 */
655 level = (bitmap.buffer[pc] * gdAlphaMax / (bitmap.num_grays - 1));
656 } else if (bitmap.pixel_mode == ft_pixel_mode_mono) {
657 /* 2.0.5: mode_mono fix from Giuliano Pochini */
658 level = ((bitmap.buffer[(col>>3)+pcr]) & (1<<(~col&0x07))) ? gdAlphaTransparent : gdAlphaOpaque;
659 } else {
660 return "Unsupported ft_pixel_mode";
661 }
662 if (level == 0) /* if background */
663 continue;
664 if ((fg >= 0) && (im->trueColor)) {
665 /* Consider alpha in the foreground color itself to be an
666 * upper bound on how opaque things get, when truecolor is
667 * available. Without truecolor this results in far too many
668 * color indexes.
669 */
670 level = level * (gdAlphaMax - gdTrueColorGetAlpha(fg)) / gdAlphaMax;
671 }
672 level = gdAlphaMax - level;
673 x = pen_x + col;
674 /* clip if out of bounds */
675 /* 2.0.16: clip to clipping rectangle, Matt McNabb */
676 if ((x > im->cx2) || (x < im->cx1)) {
677 continue;
678 }
679 /* get pixel location in gd buffer */
680 tpixel = &im->tpixels[y][x];
681 if (fg < 0) {
682 if (level < (gdAlphaMax / 2)) {
683 *tpixel = -fg;
684 }
685 } else {
686 if (im->alphaBlendingFlag) {
687 opixel = *tpixel;
688 if (gdTrueColorGetAlpha(opixel) != gdAlphaTransparent) {
689 *tpixel = gdAlphaBlend (opixel,
690 (level << 24) + (fg & 0xFFFFFF));
691 } else {
692 *tpixel = (level << 24) + (fg & 0xFFFFFF);
693 }
694 } else {
695 *tpixel = (level << 24) + (fg & 0xFFFFFF);
696 }
697 }
698 }
699 }
700 return (char *) NULL;
701 }
702 /* Non-truecolor case, restored to its more or less original form */
703 for (row = 0; row < bitmap.rows; row++) {
704 int pcr;
705 pc = row * bitmap.pitch;
706 pcr = pc;
707 if (bitmap.pixel_mode==ft_pixel_mode_mono) {
708 pc *= 8; /* pc is measured in bits for monochrome images */
709 }
710 y = pen_y + row;
711
712 /* clip if out of bounds */
713 if (y >= im->sy || y < 0) {
714 continue;
715 }
716
717 for (col = 0; col < bitmap.width; col++, pc++) {
718 if (bitmap.pixel_mode == ft_pixel_mode_grays) {
719 /*
720 * Round to NUMCOLORS levels of antialiasing for
721 * index color images since only 256 colors are
722 * available.
723 */
724 tc_key.pixel = ((bitmap.buffer[pc] * NUMCOLORS) + bitmap.num_grays / 2) / (bitmap.num_grays - 1);
725 } else if (bitmap.pixel_mode == ft_pixel_mode_mono) {
726 tc_key.pixel = ((bitmap.buffer[pc / 8] << (pc % 8)) & 128) ? NUMCOLORS : 0;
727 /* 2.0.5: mode_mono fix from Giuliano Pochini */
728 tc_key.pixel = ((bitmap.buffer[(col>>3)+pcr]) & (1<<(~col&0x07))) ? NUMCOLORS : 0;
729 } else {
730 return "Unsupported ft_pixel_mode";
731 }
732 if (tc_key.pixel > 0) { /* if not background */
733 x = pen_x + col;
734
735 /* clip if out of bounds */
736 if (x >= im->sx || x < 0) {
737 continue;
738 }
739 /* get pixel location in gd buffer */
740 pixel = &im->pixels[y][x];
741 if (tc_key.pixel == NUMCOLORS) {
742 /* use fg color directly. gd 2.0.2: watch out for
743 * negative indexes (thanks to David Marwood).
744 */
745 *pixel = (fg < 0) ? -fg : fg;
746 } else {
747 /* find antialised color */
748 tc_key.bgcolor = *pixel;
749 tc_elem = (tweencolor_t *) gdCacheGet(tc_cache, &tc_key);
750 *pixel = tc_elem->tweencolor;
751 }
752 }
753 }
754 }
755 return (char *) NULL;
756 }
757
758 static int
759 gdroundupdown (FT_F26Dot6 v1, int roundup)
760 {
761 return (!roundup) ? v1 >> 6 : (v1 + 63) >> 6;
762 }
763
764 void gdFontCacheShutdown()
765 {
766 gdMutexLock(gdFontCacheMutex);
767
768 if (fontCache) {
769 gdCacheDelete(fontCache);
770 fontCache = NULL;
771 FT_Done_FreeType(library);
772 }
773
774 gdMutexUnlock(gdFontCacheMutex);
775 }
776
777 void gdFreeFontCache()
778 {
779 gdFontCacheShutdown();
780 }
781
782 void gdFontCacheMutexSetup()
783 {
784 gdMutexSetup(gdFontCacheMutex);
785 }
786
787 void gdFontCacheMutexShutdown()
788 {
789 gdMutexShutdown(gdFontCacheMutex);
790 }
791
792 int gdFontCacheSetup(void)
793 {
794 if (fontCache) {
795 /* Already set up */
796 return 0;
797 }
798 if (FT_Init_FreeType(&library)) {
799 return -1;
800 }
801 fontCache = gdCacheCreate (FONTCACHESIZE, fontTest, fontFetch, fontRelease);
802 return 0;
803 }
804
805
806 /********************************************************************/
807 /* gdImageStringFT - render a utf8 string onto a gd image */
808
809 char *
810 gdImageStringFT (gdImage * im, int *brect, int fg, char *fontlist,
811 double ptsize, double angle, int x, int y, char *string)
812 {
813 return gdImageStringFTEx(im, brect, fg, fontlist, ptsize, angle, x, y, string, 0);
814 }
815
816 char *
817 gdImageStringFTEx (gdImage * im, int *brect, int fg, char *fontlist, double ptsize, double angle, int x, int y, char *string, gdFTStringExtraPtr strex)
818 {
819 FT_BBox bbox, glyph_bbox;
820 FT_Matrix matrix;
821 FT_Vector pen, delta, penf;
822 FT_Face face;
823 FT_Glyph image;
824 FT_GlyphSlot slot;
825 FT_Bool use_kerning;
826 FT_UInt glyph_index, previous;
827 double sin_a = sin (angle);
828 double cos_a = cos (angle);
829 int len, i = 0, ch;
830 int x1 = 0, y1 = 0;
831 font_t *font;
832 fontkey_t fontkey;
833 char *next;
834 char *tmpstr = NULL;
835 int render = (im && (im->trueColor || (fg <= 255 && fg >= -255)));
836 FT_BitmapGlyph bm;
837 /* 2.0.13: Bob Ostermann: don't force autohint, that's just for testing freetype and doesn't look as good */
838 int render_mode = FT_LOAD_DEFAULT;
839 int m, mfound;
840 /* Now tuneable thanks to Wez Furlong */
841 double linespace = LINESPACE;
842 /* 2.0.6: put this declaration with the other declarations! */
843 /*
844 * make a new tweenColorCache on every call
845 * because caching colormappings between calls
846 * is not safe. If the im-pointer points to a
847 * brand new image, the cache gives out bogus
848 * colorindexes. -- 27.06.2001 <krisku@arrak.fi>
849 */
850 gdCache_head_t *tc_cache;
851 /* Tuneable horizontal and vertical resolution in dots per inch */
852 int hdpi, vdpi;
853
854 if (strex && ((strex->flags & gdFTEX_LINESPACE) == gdFTEX_LINESPACE)) {
855 linespace = strex->linespacing;
856 }
857 tc_cache = gdCacheCreate(TWEENCOLORCACHESIZE, tweenColorTest, tweenColorFetch, tweenColorRelease);
858
859 /***** initialize font library and font cache on first call ******/
860
861 gdMutexLock(gdFontCacheMutex);
862 if (!fontCache) {
863 if (gdFontCacheSetup() != 0) {
864 gdCacheDelete(tc_cache);
865 gdMutexUnlock(gdFontCacheMutex);
866 return "Failure to initialize font library";
867 }
868 }
869 /*****/
870
871 /* 2.0.12: allow explicit specification of the preferred map;
872 * but we still fall back if it is not available.
873 */
874 m = gdFTEX_Unicode;
875 if (strex && (strex->flags & gdFTEX_CHARMAP)) {
876 m = strex->charmap;
877 }
878
879 /* get the font (via font cache) */
880 fontkey.fontlist = fontlist;
881 fontkey.library = &library;
882 fontkey.preferred_map = m;
883 font = (font_t *) gdCacheGet (fontCache, &fontkey);
884 if (!font) {
885 gdCacheDelete(tc_cache);
886 gdMutexUnlock(gdFontCacheMutex);
887 return fontCache->error;
888 }
889 face = font->face; /* shortcut */
890 slot = face->glyph; /* shortcut */
891
892 /*
893 * Added hdpi and vdpi to support images at non-screen resolutions, i.e. 300 dpi TIFF,
894 * or 100h x 50v dpi FAX format. 2.0.23.
895 * 2004/02/27 Mark Shackelford, mark.shackelford@acs-inc.com
896 */
897 hdpi = GD_RESOLUTION;
898 vdpi = GD_RESOLUTION;
899 if (strex && (strex->flags & gdFTEX_RESOLUTION)) {
900 hdpi = strex->hdpi;
901 vdpi = strex->vdpi;
902 }
903
904 if (FT_Set_Char_Size(face, 0, (FT_F26Dot6) (ptsize * 64), hdpi, vdpi)) {
905 gdCacheDelete(tc_cache);
906 gdMutexUnlock(gdFontCacheMutex);
907 return "Could not set character size";
908 }
909
910 matrix.xx = (FT_Fixed) (cos_a * (1 << 16));
911 matrix.yx = (FT_Fixed) (sin_a * (1 << 16));
912 matrix.xy = -matrix.yx;
913 matrix.yy = matrix.xx;
914
915 penf.x = penf.y = 0; /* running position of non-rotated string */
916 pen.x = pen.y = 0; /* running position of rotated string */
917 bbox.xMin = bbox.xMax = bbox.yMin = bbox.yMax = 0;
918
919 use_kerning = FT_HAS_KERNING (face);
920 previous = 0;
921 if (fg < 0) {
922 render_mode |= FT_LOAD_MONOCHROME;
923 }
924
925 /* Try all three types of maps, but start with the specified one */
926 mfound = 0;
927 for (i = 0; i < 3; i++) {
928 switch (m) {
929 case gdFTEX_Unicode:
930 if (font->have_char_map_unicode) {
931 mfound = 1;
932 }
933 break;
934 case gdFTEX_Shift_JIS:
935 if (font->have_char_map_sjis) {
936 mfound = 1;
937 }
938 break;
939 case gdFTEX_Big5:
940 /* This was the 'else' case, we can't really 'detect' it */
941 mfound = 1;
942 break;
943 }
944 if (mfound) {
945 break;
946 }
947 m++;
948 m %= 3;
949 }
950 if (!mfound) {
951 /* No character set found! */
952 gdMutexUnlock(gdFontCacheMutex);
953 return "No character set found";
954 }
955
956 #ifndef JISX0208
957 if (font->have_char_map_sjis) {
958 #endif
959 tmpstr = (char *) gdMalloc(BUFSIZ);
960 any2eucjp(tmpstr, string, BUFSIZ);
961 next = tmpstr;
962 #ifndef JISX0208
963 } else {
964 next = string;
965 }
966 #endif
967
968 i = 0;
969 while (*next) {
970 ch = *next;
971
972 /* carriage returns */
973 if (ch == '\r') {
974 penf.x = 0;
975 x1 = (int)(- penf.y * sin_a + 32) / 64;
976 y1 = (int)(- penf.y * cos_a + 32) / 64;
977 pen.x = pen.y = 0;
978 previous = 0; /* clear kerning flag */
979 next++;
980 continue;
981 }
982 /* newlines */
983 if (ch == '\n') {
984 if (!*(++next)) break;
985 /* 2.0.13: reset penf.x. Christopher J. Grayce */
986 penf.x = 0;
987 penf.y -= (long)(face->size->metrics.height * linespace);
988 penf.y = (penf.y - 32) & -64; /* round to next pixel row */
989 x1 = (int)(- penf.y * sin_a + 32) / 64;
990 y1 = (int)(- penf.y * cos_a + 32) / 64;
991 pen.x = pen.y = 0;
992 previous = 0; /* clear kerning flag */
993 continue;
994 }
995
996 /* EAM DEBUG */
997 #if (defined(FREETYPE_MAJOR) && ((FREETYPE_MAJOR == 2 && ((FREETYPE_MINOR == 1 && FREETYPE_PATCH >= 3) || FREETYPE_MINOR > 1) || FREETYPE_MAJOR > 2)))
998 if (font->face->family_name && font->face->charmap->encoding &&
999 font->face->charmap->encoding == FT_ENCODING_MS_SYMBOL && strcmp(font->face->family_name, "Symbol") == 0) {
1000 /* I do not know the significance of the constant 0xf000.
1001 * It was determined by inspection of the character codes
1002 * stored in Microsoft font symbol.
1003 * Added by Pierre (pajoye@php.net):
1004 * Convert to the Symbol glyph range only for a Symbol family member
1005 */
1006 len = gdTcl_UtfToUniChar (next, &ch);
1007 ch |= 0xf000;
1008 next += len;
1009 } else
1010 #endif /* Freetype 2.1 or better */
1011 /* EAM DEBUG */
1012
1013 switch (m) {
1014 case gdFTEX_Unicode:
1015 if (font->have_char_map_unicode) {
1016 /* use UTF-8 mapping from ASCII */
1017 len = gdTcl_UtfToUniChar(next, &ch);
1018 next += len;
1019 }
1020 break;
1021 case gdFTEX_Shift_JIS:
1022 if (font->have_char_map_sjis) {
1023 unsigned char c;
1024 int jiscode;
1025 c = *next;
1026 if (0xA1 <= c && c <= 0xFE) {
1027 next++;
1028 jiscode = 0x100 * (c & 0x7F) + ((*next) & 0x7F);
1029
1030 ch = (jiscode >> 8) & 0xFF;
1031 jiscode &= 0xFF;
1032
1033 if (ch & 1) {
1034 jiscode += 0x40 - 0x21;
1035 } else {
1036 jiscode += 0x9E - 0x21;
1037 }
1038
1039 if (jiscode >= 0x7F) {
1040 jiscode++;
1041 }
1042 ch = (ch - 0x21) / 2 + 0x81;
1043 if (ch >= 0xA0) {
1044 ch += 0x40;
1045 }
1046
1047 ch = (ch << 8) + jiscode;
1048 } else {
1049 ch = c & 0xFF; /* don't extend sign */
1050 }
1051 if (*next) next++;
1052 }
1053 break;
1054 case gdFTEX_Big5: {
1055 /*
1056 * Big 5 mapping:
1057 * use "JIS-8 half-width katakana" coding from 8-bit characters. Ref:
1058 * ftp://ftp.ora.com/pub/examples/nutshell/ujip/doc/japan.inf-032092.sjs
1059 */
1060 ch = (*next) & 0xFF; /* don't extend sign */
1061 next++;
1062 if (ch >= 161 /* first code of JIS-8 pair */
1063 && *next) { /* don't advance past '\0' */
1064 /* TBB: Fix from Kwok Wah On: & 255 needed */
1065 ch = (ch * 256) + ((*next) & 255);
1066 next++;
1067 }
1068 }
1069 break;
1070 }
1071
1072 /* set rotation transform */
1073 FT_Set_Transform(face, &matrix, NULL);
1074 /* Convert character code to glyph index */
1075 glyph_index = FT_Get_Char_Index(face, ch);
1076
1077 /* retrieve kerning distance and move pen position */
1078 if (use_kerning && previous && glyph_index) {
1079 FT_Get_Kerning(face, previous, glyph_index, ft_kerning_default, &delta);
1080 pen.x += (int)(delta.x * cos_a);
1081 pen.y -= (int)(delta.x * sin_a);
1082 penf.x += delta.x;
1083 }
1084
1085 if (brect) { /* only if need brect */
1086 /* load glyph image into the slot (erase previous one) */
1087 if (FT_Load_Glyph(face, glyph_index, render_mode | FT_LOAD_IGNORE_TRANSFORM)) {
1088 if (tmpstr) {
1089 gdFree(tmpstr);
1090 }
1091 gdCacheDelete(tc_cache);
1092 gdMutexUnlock(gdFontCacheMutex);
1093 return "Problem loading glyph";
1094 }
1095
1096 /* transform glyph image */
1097 if (FT_Get_Glyph(slot, &image)) {
1098 if (tmpstr) {
1099 gdFree(tmpstr);
1100 }
1101 gdCacheDelete(tc_cache);
1102 gdMutexUnlock(gdFontCacheMutex);
1103 return "Problem loading glyph";
1104 }
1105
1106 FT_Glyph_Get_CBox(image, ft_glyph_bbox_gridfit, &glyph_bbox);
1107 glyph_bbox.xMin += penf.x;
1108 glyph_bbox.yMin += penf.y;
1109 glyph_bbox.xMax += penf.x;
1110 glyph_bbox.yMax += penf.y;
1111 if (ch == ' ') { /* special case for trailing space */
1112 glyph_bbox.xMax += slot->metrics.horiAdvance;
1113 }
1114 if (!i) { /* if first character, init BB corner values */
1115 bbox.xMin = glyph_bbox.xMin;
1116 bbox.yMin = glyph_bbox.yMin;
1117 bbox.xMax = glyph_bbox.xMax;
1118 bbox.yMax = glyph_bbox.yMax;
1119 } else {
1120 if (bbox.xMin > glyph_bbox.xMin) {
1121 bbox.xMin = glyph_bbox.xMin;
1122 }
1123 if (bbox.yMin > glyph_bbox.yMin) {
1124 bbox.yMin = glyph_bbox.yMin;
1125 }
1126 if (bbox.xMax < glyph_bbox.xMax) {
1127 bbox.xMax = glyph_bbox.xMax;
1128 }
1129 if (bbox.yMax < glyph_bbox.yMax) {
1130 bbox.yMax = glyph_bbox.yMax;
1131 }
1132 }
1133 i++;
1134 }
1135
1136 /* increment (unrotated) pen position */
1137 penf.x += slot->metrics.horiAdvance;
1138
1139 if (render) {
1140 if (!brect || angle != 0) {
1141 /* reload the rotated glyph (for bbox we needed FT_LOAD_IGNORE_TRANSFORM - bbox is rotated later) */
1142 FT_Done_Glyph(image);
1143
1144 /* load glyph image into the slot (erase previous one) */
1145 if (FT_Load_Glyph(face, glyph_index, render_mode)) {
1146 if (tmpstr) {
1147 gdFree(tmpstr);
1148 }
1149 gdCacheDelete(tc_cache);
1150 gdMutexUnlock(gdFontCacheMutex);
1151 return "Problem loading glyph";
1152 }
1153
1154 /* transform glyph image */
1155 if (FT_Get_Glyph(slot, &image)) {
1156 if (tmpstr) {
1157 gdFree(tmpstr);
1158 }
1159 gdCacheDelete(tc_cache);
1160 gdMutexUnlock(gdFontCacheMutex);
1161 return "Problem loading glyph";
1162 }
1163 }
1164
1165 if (image->format != ft_glyph_format_bitmap && FT_Glyph_To_Bitmap(&image, ft_render_mode_normal, 0, 1)) {
1166 FT_Done_Glyph(image);
1167 if (tmpstr) {
1168 gdFree(tmpstr);
1169 }
1170 gdCacheDelete(tc_cache);
1171 gdMutexUnlock(gdFontCacheMutex);
1172 return "Problem rendering glyph";
1173 }
1174
1175 /* now, draw to our target surface */
1176 bm = (FT_BitmapGlyph) image;
1177 gdft_draw_bitmap(tc_cache, im, fg, bm->bitmap, x + x1 + ((pen.x + 31) >> 6) + bm->left, y + y1 + ((pen.y + 31) >> 6) - bm->top);
1178 }
1179
1180 /* record current glyph index for kerning */
1181 previous = glyph_index;
1182
1183 /* increment pen position */
1184 pen.x += image->advance.x >> 10;
1185 pen.y -= image->advance.y >> 10;
1186
1187 FT_Done_Glyph(image);
1188 }
1189
1190 if (brect) { /* only if need brect */
1191 /* For perfect rounding, must get sin(a + pi/4) and sin(a - pi/4). */
1192 double d1 = sin (angle + 0.78539816339744830962);
1193 double d2 = sin (angle - 0.78539816339744830962);
1194
1195 /* rotate bounding rectangle (at 0, 0) */
1196 brect[0] = (int) (bbox.xMin * cos_a - bbox.yMin * sin_a);
1197 brect[1] = (int) (bbox.xMin * sin_a + bbox.yMin * cos_a);
1198 brect[2] = (int) (bbox.xMax * cos_a - bbox.yMin * sin_a);
1199 brect[3] = (int) (bbox.xMax * sin_a + bbox.yMin * cos_a);
1200 brect[4] = (int) (bbox.xMax * cos_a - bbox.yMax * sin_a);
1201 brect[5] = (int) (bbox.xMax * sin_a + bbox.yMax * cos_a);
1202 brect[6] = (int) (bbox.xMin * cos_a - bbox.yMax * sin_a);
1203 brect[7] = (int) (bbox.xMin * sin_a + bbox.yMax * cos_a);
1204
1205 /* scale, round and offset brect */
1206 brect[0] = x + gdroundupdown(brect[0], d2 > 0);
1207 brect[1] = y - gdroundupdown(brect[1], d1 < 0);
1208 brect[2] = x + gdroundupdown(brect[2], d1 > 0);
1209 brect[3] = y - gdroundupdown(brect[3], d2 > 0);
1210 brect[4] = x + gdroundupdown(brect[4], d2 < 0);
1211 brect[5] = y - gdroundupdown(brect[5], d1 > 0);
1212 brect[6] = x + gdroundupdown(brect[6], d1 < 0);
1213 brect[7] = y - gdroundupdown(brect[7], d2 < 0);
1214 }
1215
1216 if (tmpstr) {
1217 gdFree(tmpstr);
1218 }
1219 gdCacheDelete(tc_cache);
1220 gdMutexUnlock(gdFontCacheMutex);
1221 return (char *) NULL;
1222 }
1223
1224 #endif /* HAVE_LIBFREETYPE */
1225
