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 _WIN32
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 /* Actual length doesn't matter, just the minimum does up to length 2. */
405 unsigned int min_length = 0;
406 if (name[0] != '\0') {
407 if (name[1] != '\0') {
408 min_length = 2;
409 } else {
410 min_length = 1;
411 }
412 }
413 ZEND_IGNORE_VALUE(min_length); /* On Posix systems this may be unused */
414 if (IS_ABSOLUTE_PATH(name, min_length)) {
415 #endif
416 snprintf(fullname, sizeof(fullname) - 1, "%s", name);
417 if (access(fullname, R_OK) == 0) {
418 font_found++;
419 break;
420 }
421 }
422 for (dir = gd_strtok_r (path, PATHSEPARATOR, &strtok_ptr_path); dir;
423 dir = gd_strtok_r (0, PATHSEPARATOR, &strtok_ptr_path)) {
424 if (!strcmp(dir, ".")) {
425 #ifdef HAVE_GETCWD
426 dir = VCWD_GETCWD(cur_dir, MAXPATHLEN);
427 #elif defined(HAVE_GETWD)
428 dir = VCWD_GETWD(cur_dir);
429 #endif
430 if (!dir) {
431 continue;
432 }
433 }
434
435 #define GD_CHECK_FONT_PATH(ext) \
436 snprintf(fullname, sizeof(fullname) - 1, "%s/%s%s", dir, name, ext); \
437 if (access(fullname, R_OK) == 0) { \
438 font_found++; \
439 break; \
440 } \
441
442 GD_CHECK_FONT_PATH("");
443 GD_CHECK_FONT_PATH(".ttf");
444 GD_CHECK_FONT_PATH(".pfa");
445 GD_CHECK_FONT_PATH(".pfb");
446 GD_CHECK_FONT_PATH(".dfont");
447 }
448 gdFree(path);
449 path = NULL;
450 if (font_found) {
451 break;
452 }
453 }
454
455 if (path) {
456 gdFree(path);
457 }
458
459 gdFree(fontlist);
460
461 if (!font_found) {
462 gdPFree(a->fontlist);
463 gdPFree(a);
464 *error = "Could not find/open font";
465 return NULL;
466 }
467
468 err = FT_New_Face (*b->library, fullname, 0, &a->face);
469 if (err) {
470 gdPFree(a->fontlist);
471 gdPFree(a);
472 *error = "Could not read font";
473 return NULL;
474 }
475
476 /* FIXME - This mapping stuff is incomplete - where is the spec? */
477 /* EAM - It's worse than that. It's pointless to match character encodings here.
478 * As currently written, the stored a->face->charmap only matches one of
479 * the actual charmaps and we cannot know at this stage if it is the right
480 * one. We should just skip all this stuff, and check in gdImageStringFTEx
481 * if some particular charmap is preferred and if so whether it is held in
482 * one of the a->face->charmaps[0..num_charmaps].
483 * And why is it so bad not to find any recognized charmap? The user may
484 * still know what mapping to use, even if we do not. In that case we can
485 * just use the map in a->face->charmaps[num_charmaps] and be done with it.
486 */
487
488 for (n = 0; n < a->face->num_charmaps; n++) {
489 charmap = a->face->charmaps[n];
490 platform = charmap->platform_id;
491 encoding = charmap->encoding_id;
492
493 /* Whatever is the last value is what should be set */
494 a->have_char_map_unicode = 0;
495 a->have_char_map_big5 = 0;
496 a->have_char_map_sjis = 0;
497 a->have_char_map_apple_roman = 0;
498
499 /* EAM DEBUG - Newer versions of libfree2 make it easier by defining encodings */
500 #if (defined(FREETYPE_MAJOR) && ((FREETYPE_MAJOR == 2 && ((FREETYPE_MINOR == 1 && FREETYPE_PATCH >= 3) || FREETYPE_MINOR > 1) || FREETYPE_MAJOR > 2)))
501 if (charmap->encoding == FT_ENCODING_MS_SYMBOL
502 || charmap->encoding == FT_ENCODING_ADOBE_CUSTOM
503 || charmap->encoding == FT_ENCODING_ADOBE_STANDARD) {
504 a->have_char_map_unicode = 1;
505 found = charmap;
506 a->face->charmap = charmap;
507 return (void *)a;
508 }
509 #endif /* Freetype 2.1.3 or better */
510 /* EAM DEBUG */
511
512 if ((platform == 3 && encoding == 1) /* Windows Unicode */
513 || (platform == 3 && encoding == 0) /* Windows Symbol */
514 || (platform == 2 && encoding == 1) /* ISO Unicode */
515 || (platform == 0))
516 { /* Apple Unicode */
517 a->have_char_map_unicode = 1;
518 found = charmap;
519 if (b->preferred_map == gdFTEX_Unicode) {
520 break;
521 }
522 } else if (platform == 3 && encoding == 4) { /* Windows Big5 */
523 a->have_char_map_big5 = 1;
524 found = charmap;
525 if (b->preferred_map == gdFTEX_Big5) {
526 break;
527 }
528 } else if (platform == 3 && encoding == 2) { /* Windows Sjis */
529 a->have_char_map_sjis = 1;
530 found = charmap;
531 if (b->preferred_map == gdFTEX_Shift_JIS) {
532 break;
533 }
534 } else if ((platform == 1 && encoding == 0) /* Apple Roman */
535 || (platform == 2 && encoding == 0))
536 { /* ISO ASCII */
537 a->have_char_map_apple_roman = 1;
538 found = charmap;
539 if (b->preferred_map == gdFTEX_MacRoman) {
540 break;
541 }
542 }
543 }
544 if (!found) {
545 gdPFree(a->fontlist);
546 gdPFree(a);
547 *error = "Unable to find a CharMap that I can handle";
548 return NULL;
549 }
550
551 /* 2.0.5: we should actually return this */
552 a->face->charmap = found;
553 return (void *) a;
554 }
555
556 static void fontRelease (void *element)
557 {
558 font_t *a = (font_t *) element;
559
560 FT_Done_Face (a->face);
561 gdPFree(a->fontlist);
562 gdPFree((char *) element);
563 }
564
565 /********************************************************************/
566 /* tweencolor cache functions */
567
568 static int tweenColorTest (void *element, void *key)
569 {
570 tweencolor_t *a = (tweencolor_t *) element;
571 tweencolorkey_t *b = (tweencolorkey_t *) key;
572
573 return (a->pixel == b->pixel && a->bgcolor == b->bgcolor && a->fgcolor == b->fgcolor && a->im == b->im);
574 }
575
576 /*
577 * Computes a color in im's color table that is part way between
578 * the background and foreground colors proportional to the gray
579 * pixel value in the range 0-NUMCOLORS. The fg and bg colors must already
580 * be in the color table for palette images. For truecolor images the
581 * returned value simply has an alpha component and gdImageAlphaBlend
582 * does the work so that text can be alpha blended across a complex
583 * background (TBB; and for real in 2.0.2).
584 */
585 static void * tweenColorFetch (char **error, void *key)
586 {
587 tweencolor_t *a;
588 tweencolorkey_t *b = (tweencolorkey_t *) key;
589 int pixel, npixel, bg, fg;
590 gdImagePtr im;
591
592 a = (tweencolor_t *) gdMalloc (sizeof (tweencolor_t));
593 pixel = a->pixel = b->pixel;
594 bg = a->bgcolor = b->bgcolor;
595 fg = a->fgcolor = b->fgcolor;
596 im = a->im = b->im;
597
598 /* if fg is specified by a negative color idx, then don't antialias */
599 if (fg < 0) {
600 if ((pixel + pixel) >= NUMCOLORS) {
601 a->tweencolor = -fg;
602 } else {
603 a->tweencolor = bg;
604 }
605 } else {
606 npixel = NUMCOLORS - pixel;
607 if (im->trueColor) {
608 /* 2.0.1: use gdImageSetPixel to do the alpha blending work,
609 * or to just store the alpha level. All we have to do here
610 * is incorporate our knowledge of the percentage of this
611 * pixel that is really "lit" by pushing the alpha value
612 * up toward transparency in edge regions.
613 */
614 a->tweencolor = gdTrueColorAlpha(
615 gdTrueColorGetRed(fg),
616 gdTrueColorGetGreen(fg),
617 gdTrueColorGetBlue(fg),
618 gdAlphaMax - (gdTrueColorGetAlpha (fg) * pixel / NUMCOLORS));
619 } else {
620 a->tweencolor = gdImageColorResolve(im,
621 (pixel * im->red[fg] + npixel * im->red[bg]) / NUMCOLORS,
622 (pixel * im->green[fg] + npixel * im->green[bg]) / NUMCOLORS,
623 (pixel * im->blue[fg] + npixel * im->blue[bg]) / NUMCOLORS);
624 }
625 }
626 return (void *) a;
627 }
628
629 static void tweenColorRelease (void *element)
630 {
631 gdFree((char *) element);
632 }
633
634 /* draw_bitmap - transfers glyph bitmap to GD image */
635 static char * gdft_draw_bitmap (gdCache_head_t *tc_cache, gdImage * im, int fg, FT_Bitmap bitmap, int pen_x, int pen_y)
636 {
637 unsigned char *pixel = NULL;
638 int *tpixel = NULL;
639 int opixel;
640 int x, y, row, col, pc, pcr;
641
642 tweencolor_t *tc_elem;
643 tweencolorkey_t tc_key;
644
645 /* copy to image, mapping colors */
646 tc_key.fgcolor = fg;
647 tc_key.im = im;
648 /* Truecolor version; does not require the cache */
649 if (im->trueColor) {
650 for (row = 0; row < bitmap.rows; row++) {
651 pc = row * bitmap.pitch;
652 pcr = pc;
653 y = pen_y + row;
654 /* clip if out of bounds */
655 /* 2.0.16: clipping rectangle, not image bounds */
656 if ((y > im->cy2) || (y < im->cy1)) {
657 continue;
658 }
659 for (col = 0; col < bitmap.width; col++, pc++) {
660 int level;
661 if (bitmap.pixel_mode == ft_pixel_mode_grays) {
662 /* Scale to 128 levels of alpha for gd use.
663 * alpha 0 is opacity, so be sure to invert at the end
664 */
665 level = (bitmap.buffer[pc] * gdAlphaMax / (bitmap.num_grays - 1));
666 } else if (bitmap.pixel_mode == ft_pixel_mode_mono) {
667 /* 2.0.5: mode_mono fix from Giuliano Pochini */
668 level = ((bitmap.buffer[(col>>3)+pcr]) & (1<<(~col&0x07))) ? gdAlphaTransparent : gdAlphaOpaque;
669 } else {
670 return "Unsupported ft_pixel_mode";
671 }
672 if (level == 0) /* if background */
673 continue;
674 if ((fg >= 0) && (im->trueColor)) {
675 /* Consider alpha in the foreground color itself to be an
676 * upper bound on how opaque things get, when truecolor is
677 * available. Without truecolor this results in far too many
678 * color indexes.
679 */
680 level = level * (gdAlphaMax - gdTrueColorGetAlpha(fg)) / gdAlphaMax;
681 }
682 level = gdAlphaMax - level;
683 x = pen_x + col;
684 /* clip if out of bounds */
685 /* 2.0.16: clip to clipping rectangle, Matt McNabb */
686 if ((x > im->cx2) || (x < im->cx1)) {
687 continue;
688 }
689 /* get pixel location in gd buffer */
690 tpixel = &im->tpixels[y][x];
691 if (fg < 0) {
692 if (level < (gdAlphaMax / 2)) {
693 *tpixel = -fg;
694 }
695 } else {
696 if (im->alphaBlendingFlag) {
697 opixel = *tpixel;
698 if (gdTrueColorGetAlpha(opixel) != gdAlphaTransparent) {
699 *tpixel = gdAlphaBlend (opixel,
700 (level << 24) + (fg & 0xFFFFFF));
701 } else {
702 *tpixel = (level << 24) + (fg & 0xFFFFFF);
703 }
704 } else {
705 *tpixel = (level << 24) + (fg & 0xFFFFFF);
706 }
707 }
708 }
709 }
710 return (char *) NULL;
711 }
712 /* Non-truecolor case, restored to its more or less original form */
713 for (row = 0; row < bitmap.rows; row++) {
714 int pcr;
715 pc = row * bitmap.pitch;
716 pcr = pc;
717 if (bitmap.pixel_mode==ft_pixel_mode_mono) {
718 pc *= 8; /* pc is measured in bits for monochrome images */
719 }
720 y = pen_y + row;
721
722 /* clip if out of bounds */
723 if (y >= im->sy || y < 0) {
724 continue;
725 }
726
727 for (col = 0; col < bitmap.width; col++, pc++) {
728 if (bitmap.pixel_mode == ft_pixel_mode_grays) {
729 /*
730 * Round to NUMCOLORS levels of antialiasing for
731 * index color images since only 256 colors are
732 * available.
733 */
734 tc_key.pixel = ((bitmap.buffer[pc] * NUMCOLORS) + bitmap.num_grays / 2) / (bitmap.num_grays - 1);
735 } else if (bitmap.pixel_mode == ft_pixel_mode_mono) {
736 tc_key.pixel = ((bitmap.buffer[pc / 8] << (pc % 8)) & 128) ? NUMCOLORS : 0;
737 /* 2.0.5: mode_mono fix from Giuliano Pochini */
738 tc_key.pixel = ((bitmap.buffer[(col>>3)+pcr]) & (1<<(~col&0x07))) ? NUMCOLORS : 0;
739 } else {
740 return "Unsupported ft_pixel_mode";
741 }
742 if (tc_key.pixel > 0) { /* if not background */
743 x = pen_x + col;
744
745 /* clip if out of bounds */
746 if (x >= im->sx || x < 0) {
747 continue;
748 }
749 /* get pixel location in gd buffer */
750 pixel = &im->pixels[y][x];
751 if (tc_key.pixel == NUMCOLORS) {
752 /* use fg color directly. gd 2.0.2: watch out for
753 * negative indexes (thanks to David Marwood).
754 */
755 *pixel = (fg < 0) ? -fg : fg;
756 } else {
757 /* find antialised color */
758 tc_key.bgcolor = *pixel;
759 tc_elem = (tweencolor_t *) gdCacheGet(tc_cache, &tc_key);
760 *pixel = tc_elem->tweencolor;
761 }
762 }
763 }
764 }
765 return (char *) NULL;
766 }
767
768 static int
769 gdroundupdown (FT_F26Dot6 v1, int roundup)
770 {
771 return (!roundup) ? v1 >> 6 : (v1 + 63) >> 6;
772 }
773
774 void gdFontCacheShutdown()
775 {
776 gdMutexLock(gdFontCacheMutex);
777
778 if (fontCache) {
779 gdCacheDelete(fontCache);
780 fontCache = NULL;
781 FT_Done_FreeType(library);
782 }
783
784 gdMutexUnlock(gdFontCacheMutex);
785 }
786
787 void gdFreeFontCache(void)
788 {
789 gdFontCacheShutdown();
790 }
791
792 void gdFontCacheMutexSetup()
793 {
794 gdMutexSetup(gdFontCacheMutex);
795 }
796
797 void gdFontCacheMutexShutdown()
798 {
799 gdMutexShutdown(gdFontCacheMutex);
800 }
801
802 int gdFontCacheSetup(void)
803 {
804 if (fontCache) {
805 /* Already set up */
806 return 0;
807 }
808 if (FT_Init_FreeType(&library)) {
809 return -1;
810 }
811 fontCache = gdCacheCreate (FONTCACHESIZE, fontTest, fontFetch, fontRelease);
812 return 0;
813 }
814
815
816 /********************************************************************/
817 /* gdImageStringFT - render a utf8 string onto a gd image */
818
819 char *
820 gdImageStringFT (gdImage * im, int *brect, int fg, char *fontlist,
821 double ptsize, double angle, int x, int y, char *string)
822 {
823 return gdImageStringFTEx(im, brect, fg, fontlist, ptsize, angle, x, y, string, 0);
824 }
825
826 char *
827 gdImageStringFTEx (gdImage * im, int *brect, int fg, char *fontlist, double ptsize, double angle, int x, int y, char *string, gdFTStringExtraPtr strex)
828 {
829 FT_BBox bbox, glyph_bbox;
830 FT_Matrix matrix;
831 FT_Vector pen, delta, penf;
832 FT_Face face;
833 FT_Glyph image;
834 FT_GlyphSlot slot;
835 FT_Bool use_kerning;
836 FT_UInt glyph_index, previous;
837 double sin_a = sin (angle);
838 double cos_a = cos (angle);
839 int len, i = 0, ch;
840 int x1 = 0, y1 = 0;
841 font_t *font;
842 fontkey_t fontkey;
843 char *next;
844 char *tmpstr = NULL;
845 int render = (im && (im->trueColor || (fg <= 255 && fg >= -255)));
846 FT_BitmapGlyph bm;
847 /* 2.0.13: Bob Ostermann: don't force autohint, that's just for testing freetype and doesn't look as good */
848 int render_mode = FT_LOAD_DEFAULT;
849 int m, mfound;
850 /* Now tuneable thanks to Wez Furlong */
851 double linespace = LINESPACE;
852 /* 2.0.6: put this declaration with the other declarations! */
853 /*
854 * make a new tweenColorCache on every call
855 * because caching colormappings between calls
856 * is not safe. If the im-pointer points to a
857 * brand new image, the cache gives out bogus
858 * colorindexes. -- 27.06.2001 <krisku@arrak.fi>
859 */
860 gdCache_head_t *tc_cache;
861 /* Tuneable horizontal and vertical resolution in dots per inch */
862 int hdpi, vdpi;
863
864 if (strex && ((strex->flags & gdFTEX_LINESPACE) == gdFTEX_LINESPACE)) {
865 linespace = strex->linespacing;
866 }
867 tc_cache = gdCacheCreate(TWEENCOLORCACHESIZE, tweenColorTest, tweenColorFetch, tweenColorRelease);
868
869 /***** initialize font library and font cache on first call ******/
870
871 gdMutexLock(gdFontCacheMutex);
872 if (!fontCache) {
873 if (gdFontCacheSetup() != 0) {
874 gdCacheDelete(tc_cache);
875 gdMutexUnlock(gdFontCacheMutex);
876 return "Failure to initialize font library";
877 }
878 }
879 /*****/
880
881 /* 2.0.12: allow explicit specification of the preferred map;
882 * but we still fall back if it is not available.
883 */
884 m = gdFTEX_Unicode;
885 if (strex && (strex->flags & gdFTEX_CHARMAP)) {
886 m = strex->charmap;
887 }
888
889 /* get the font (via font cache) */
890 fontkey.fontlist = fontlist;
891 fontkey.library = &library;
892 fontkey.preferred_map = m;
893 font = (font_t *) gdCacheGet (fontCache, &fontkey);
894 if (!font) {
895 gdCacheDelete(tc_cache);
896 gdMutexUnlock(gdFontCacheMutex);
897 return fontCache->error;
898 }
899 face = font->face; /* shortcut */
900 slot = face->glyph; /* shortcut */
901
902 /*
903 * Added hdpi and vdpi to support images at non-screen resolutions, i.e. 300 dpi TIFF,
904 * or 100h x 50v dpi FAX format. 2.0.23.
905 * 2004/02/27 Mark Shackelford, mark.shackelford@acs-inc.com
906 */
907 hdpi = GD_RESOLUTION;
908 vdpi = GD_RESOLUTION;
909 if (strex && (strex->flags & gdFTEX_RESOLUTION)) {
910 hdpi = strex->hdpi;
911 vdpi = strex->vdpi;
912 }
913
914 if (FT_Set_Char_Size(face, 0, (FT_F26Dot6) (ptsize * 64), hdpi, vdpi)) {
915 gdCacheDelete(tc_cache);
916 gdMutexUnlock(gdFontCacheMutex);
917 return "Could not set character size";
918 }
919
920 matrix.xx = (FT_Fixed) (cos_a * (1 << 16));
921 matrix.yx = (FT_Fixed) (sin_a * (1 << 16));
922 matrix.xy = -matrix.yx;
923 matrix.yy = matrix.xx;
924
925 penf.x = penf.y = 0; /* running position of non-rotated string */
926 pen.x = pen.y = 0; /* running position of rotated string */
927 bbox.xMin = bbox.xMax = bbox.yMin = bbox.yMax = 0;
928
929 use_kerning = FT_HAS_KERNING (face);
930 previous = 0;
931 if (fg < 0) {
932 render_mode |= FT_LOAD_MONOCHROME;
933 }
934
935 /* Try all three types of maps, but start with the specified one */
936 mfound = 0;
937 for (i = 0; i < 3; i++) {
938 switch (m) {
939 case gdFTEX_Unicode:
940 if (font->have_char_map_unicode) {
941 mfound = 1;
942 }
943 break;
944 case gdFTEX_Shift_JIS:
945 if (font->have_char_map_sjis) {
946 mfound = 1;
947 }
948 break;
949 case gdFTEX_Big5:
950 /* This was the 'else' case, we can't really 'detect' it */
951 mfound = 1;
952 break;
953 }
954 if (mfound) {
955 break;
956 }
957 m++;
958 m %= 3;
959 }
960 if (!mfound) {
961 /* No character set found! */
962 gdMutexUnlock(gdFontCacheMutex);
963 return "No character set found";
964 }
965
966 #ifndef JISX0208
967 if (font->have_char_map_sjis) {
968 #endif
969 tmpstr = (char *) gdMalloc(BUFSIZ);
970 any2eucjp(tmpstr, string, BUFSIZ);
971 next = tmpstr;
972 #ifndef JISX0208
973 } else {
974 next = string;
975 }
976 #endif
977
978 i = 0;
979 while (*next) {
980 ch = *next;
981
982 /* carriage returns */
983 if (ch == '\r') {
984 penf.x = 0;
985 x1 = (int)(- penf.y * sin_a + 32) / 64;
986 y1 = (int)(- penf.y * cos_a + 32) / 64;
987 pen.x = pen.y = 0;
988 previous = 0; /* clear kerning flag */
989 next++;
990 continue;
991 }
992 /* newlines */
993 if (ch == '\n') {
994 if (!*(++next)) break;
995 /* 2.0.13: reset penf.x. Christopher J. Grayce */
996 penf.x = 0;
997 penf.y -= (long)(face->size->metrics.height * linespace);
998 penf.y = (penf.y - 32) & -64; /* round to next pixel row */
999 x1 = (int)(- penf.y * sin_a + 32) / 64;
1000 y1 = (int)(- penf.y * cos_a + 32) / 64;
1001 pen.x = pen.y = 0;
1002 previous = 0; /* clear kerning flag */
1003 continue;
1004 }
1005
1006 /* EAM DEBUG */
1007 #if (defined(FREETYPE_MAJOR) && ((FREETYPE_MAJOR == 2 && ((FREETYPE_MINOR == 1 && FREETYPE_PATCH >= 3) || FREETYPE_MINOR > 1) || FREETYPE_MAJOR > 2)))
1008 if (font->face->family_name && font->face->charmap->encoding &&
1009 font->face->charmap->encoding == FT_ENCODING_MS_SYMBOL && strcmp(font->face->family_name, "Symbol") == 0) {
1010 /* I do not know the significance of the constant 0xf000.
1011 * It was determined by inspection of the character codes
1012 * stored in Microsoft font symbol.
1013 * Added by Pierre (pajoye@php.net):
1014 * Convert to the Symbol glyph range only for a Symbol family member
1015 */
1016 len = gdTcl_UtfToUniChar (next, &ch);
1017 ch |= 0xf000;
1018 next += len;
1019 } else
1020 #endif /* Freetype 2.1 or better */
1021 /* EAM DEBUG */
1022
1023 switch (m) {
1024 case gdFTEX_Unicode:
1025 if (font->have_char_map_unicode) {
1026 /* use UTF-8 mapping from ASCII */
1027 len = gdTcl_UtfToUniChar(next, &ch);
1028 next += len;
1029 }
1030 break;
1031 case gdFTEX_Shift_JIS:
1032 if (font->have_char_map_sjis) {
1033 unsigned char c;
1034 int jiscode;
1035 c = *next;
1036 if (0xA1 <= c && c <= 0xFE) {
1037 next++;
1038 jiscode = 0x100 * (c & 0x7F) + ((*next) & 0x7F);
1039
1040 ch = (jiscode >> 8) & 0xFF;
1041 jiscode &= 0xFF;
1042
1043 if (ch & 1) {
1044 jiscode += 0x40 - 0x21;
1045 } else {
1046 jiscode += 0x9E - 0x21;
1047 }
1048
1049 if (jiscode >= 0x7F) {
1050 jiscode++;
1051 }
1052 ch = (ch - 0x21) / 2 + 0x81;
1053 if (ch >= 0xA0) {
1054 ch += 0x40;
1055 }
1056
1057 ch = (ch << 8) + jiscode;
1058 } else {
1059 ch = c & 0xFF; /* don't extend sign */
1060 }
1061 if (*next) next++;
1062 }
1063 break;
1064 case gdFTEX_Big5: {
1065 /*
1066 * Big 5 mapping:
1067 * use "JIS-8 half-width katakana" coding from 8-bit characters. Ref:
1068 * ftp://ftp.ora.com/pub/examples/nutshell/ujip/doc/japan.inf-032092.sjs
1069 */
1070 ch = (*next) & 0xFF; /* don't extend sign */
1071 next++;
1072 if (ch >= 161 /* first code of JIS-8 pair */
1073 && *next) { /* don't advance past '\0' */
1074 /* TBB: Fix from Kwok Wah On: & 255 needed */
1075 ch = (ch * 256) + ((*next) & 255);
1076 next++;
1077 }
1078 }
1079 break;
1080 }
1081
1082 /* set rotation transform */
1083 FT_Set_Transform(face, &matrix, NULL);
1084 /* Convert character code to glyph index */
1085 glyph_index = FT_Get_Char_Index(face, ch);
1086
1087 /* retrieve kerning distance and move pen position */
1088 if (use_kerning && previous && glyph_index) {
1089 FT_Get_Kerning(face, previous, glyph_index, ft_kerning_default, &delta);
1090 pen.x += (int)(delta.x * cos_a);
1091 pen.y -= (int)(delta.x * sin_a);
1092 penf.x += delta.x;
1093 }
1094
1095 if (brect) { /* only if need brect */
1096 /* load glyph image into the slot (erase previous one) */
1097 if (FT_Load_Glyph(face, glyph_index, render_mode | FT_LOAD_IGNORE_TRANSFORM)) {
1098 if (tmpstr) {
1099 gdFree(tmpstr);
1100 }
1101 gdCacheDelete(tc_cache);
1102 gdMutexUnlock(gdFontCacheMutex);
1103 return "Problem loading glyph";
1104 }
1105
1106 /* transform glyph image */
1107 if (FT_Get_Glyph(slot, &image)) {
1108 if (tmpstr) {
1109 gdFree(tmpstr);
1110 }
1111 gdCacheDelete(tc_cache);
1112 gdMutexUnlock(gdFontCacheMutex);
1113 return "Problem loading glyph";
1114 }
1115
1116 FT_Glyph_Get_CBox(image, ft_glyph_bbox_gridfit, &glyph_bbox);
1117 glyph_bbox.xMin += penf.x;
1118 glyph_bbox.yMin += penf.y;
1119 glyph_bbox.xMax += penf.x;
1120 glyph_bbox.yMax += penf.y;
1121 if (ch == ' ') { /* special case for trailing space */
1122 glyph_bbox.xMax += slot->metrics.horiAdvance;
1123 }
1124 if (!i) { /* if first character, init BB corner values */
1125 bbox.xMin = glyph_bbox.xMin;
1126 bbox.yMin = glyph_bbox.yMin;
1127 bbox.xMax = glyph_bbox.xMax;
1128 bbox.yMax = glyph_bbox.yMax;
1129 } else {
1130 if (bbox.xMin > glyph_bbox.xMin) {
1131 bbox.xMin = glyph_bbox.xMin;
1132 }
1133 if (bbox.yMin > glyph_bbox.yMin) {
1134 bbox.yMin = glyph_bbox.yMin;
1135 }
1136 if (bbox.xMax < glyph_bbox.xMax) {
1137 bbox.xMax = glyph_bbox.xMax;
1138 }
1139 if (bbox.yMax < glyph_bbox.yMax) {
1140 bbox.yMax = glyph_bbox.yMax;
1141 }
1142 }
1143 i++;
1144 }
1145
1146 /* increment (unrotated) pen position */
1147 penf.x += slot->metrics.horiAdvance;
1148
1149 if (render) {
1150 if (!brect || angle != 0) {
1151 /* reload the rotated glyph (for bbox we needed FT_LOAD_IGNORE_TRANSFORM - bbox is rotated later) */
1152 FT_Done_Glyph(image);
1153
1154 /* load glyph image into the slot (erase previous one) */
1155 if (FT_Load_Glyph(face, glyph_index, render_mode)) {
1156 if (tmpstr) {
1157 gdFree(tmpstr);
1158 }
1159 gdCacheDelete(tc_cache);
1160 gdMutexUnlock(gdFontCacheMutex);
1161 return "Problem loading glyph";
1162 }
1163
1164 /* transform glyph image */
1165 if (FT_Get_Glyph(slot, &image)) {
1166 if (tmpstr) {
1167 gdFree(tmpstr);
1168 }
1169 gdCacheDelete(tc_cache);
1170 gdMutexUnlock(gdFontCacheMutex);
1171 return "Problem loading glyph";
1172 }
1173 }
1174
1175 if (image->format != ft_glyph_format_bitmap && FT_Glyph_To_Bitmap(&image, ft_render_mode_normal, 0, 1)) {
1176 FT_Done_Glyph(image);
1177 if (tmpstr) {
1178 gdFree(tmpstr);
1179 }
1180 gdCacheDelete(tc_cache);
1181 gdMutexUnlock(gdFontCacheMutex);
1182 return "Problem rendering glyph";
1183 }
1184
1185 /* now, draw to our target surface */
1186 bm = (FT_BitmapGlyph) image;
1187 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);
1188 }
1189
1190 /* record current glyph index for kerning */
1191 previous = glyph_index;
1192
1193 /* increment pen position */
1194 pen.x += image->advance.x >> 10;
1195 pen.y -= image->advance.y >> 10;
1196
1197 FT_Done_Glyph(image);
1198 }
1199
1200 if (brect) { /* only if need brect */
1201 /* For perfect rounding, must get sin(a + pi/4) and sin(a - pi/4). */
1202 double d1 = sin (angle + 0.78539816339744830962);
1203 double d2 = sin (angle - 0.78539816339744830962);
1204
1205 /* rotate bounding rectangle (at 0, 0) */
1206 brect[0] = (int) (bbox.xMin * cos_a - bbox.yMin * sin_a);
1207 brect[1] = (int) (bbox.xMin * sin_a + bbox.yMin * cos_a);
1208 brect[2] = (int) (bbox.xMax * cos_a - bbox.yMin * sin_a);
1209 brect[3] = (int) (bbox.xMax * sin_a + bbox.yMin * cos_a);
1210 brect[4] = (int) (bbox.xMax * cos_a - bbox.yMax * sin_a);
1211 brect[5] = (int) (bbox.xMax * sin_a + bbox.yMax * cos_a);
1212 brect[6] = (int) (bbox.xMin * cos_a - bbox.yMax * sin_a);
1213 brect[7] = (int) (bbox.xMin * sin_a + bbox.yMax * cos_a);
1214
1215 /* scale, round and offset brect */
1216 brect[0] = x + gdroundupdown(brect[0], d2 > 0);
1217 brect[1] = y - gdroundupdown(brect[1], d1 < 0);
1218 brect[2] = x + gdroundupdown(brect[2], d1 > 0);
1219 brect[3] = y - gdroundupdown(brect[3], d2 > 0);
1220 brect[4] = x + gdroundupdown(brect[4], d2 < 0);
1221 brect[5] = y - gdroundupdown(brect[5], d1 > 0);
1222 brect[6] = x + gdroundupdown(brect[6], d1 < 0);
1223 brect[7] = y - gdroundupdown(brect[7], d2 < 0);
1224 }
1225
1226 if (tmpstr) {
1227 gdFree(tmpstr);
1228 }
1229 gdCacheDelete(tc_cache);
1230 gdMutexUnlock(gdFontCacheMutex);
1231 return (char *) NULL;
1232 }
1233
1234 #endif /* HAVE_LIBFREETYPE */
1235
