xref: /PHP-7.4/ext/gd/libgd/gdft.c (revision ba2b50d0)
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. &#197; */
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