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/******************************************************************************
*
* Project: MapServer
* Purpose: Text Layout functions, eventually using Harfbuzz and Fribidi/ICU
* Author: Thomas Bonfort and the MapServer team.
*
******************************************************************************
* Copyright (c) 1996-2013 Regents of the University of Minnesota.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies of this Software or works derived from this Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#include <float.h>
#include "mapserver.h"
#ifdef USE_ICONV
#include <iconv.h>
#include <wchar.h>
#endif
#include "fontcache.h"
#include FT_ADVANCES_H
#include FT_TYPES_H
typedef struct{
unsigned int *unicodes;
unsigned int *codepoints;
#ifdef USE_FRIBIDI
FriBidiCharType *ctypes;
FriBidiLevel *bidi_levels;
#endif
#ifdef USE_HARFBUZZ
hb_script_t *scripts;
#endif
} TextInfo;
typedef struct {
int offset; /* offset in TextInfo entries where the current run is starting */
int length; /* number of unicode glyphs in this run */
#ifdef USE_FRIBIDI
FriBidiLevel rtl; /* bidi embedding level of run: -1 to skip shaping, otherwise if pair:ltr, odd:rtl */
hb_script_t script; /* script: latin, arabic, thai, etc... */
#endif
int line_number;
face_element *face; /* font face to use for this run */
} text_run;
#ifdef USE_HARFBUZZ
struct _ms_hb_user_data {
text_run *run;
TextInfo *info;
int glyph_size;
};
const char *_ms_script_prefix_en = "en:";
const char *_ms_script_prefix_ar = "ar:";
const char *_ms_script_prefix_cn = "cn:";
const char *_ms_script_prefix_hy = "hy:";
const char *_ms_script_prefix_bn = "bn:";
const char *_ms_script_prefix_iu = "iu";
const char *_ms_script_prefix_chr= "chr:";
const char *_ms_script_prefix_cop= "cop:";
const char *_ms_script_prefix_ru = "ru:";
const char *_ms_script_prefix_hi = "hi:";
const char *_ms_script_prefix_ka = "ka:";
const char *_ms_script_prefix_el = "el:";
const char *_ms_script_prefix_gu = "gu:";
const char *_ms_script_prefix_pa = "pa:";
const char *_ms_script_prefix_ko = "ko:";
const char *_ms_script_prefix_he = "he:";
const char *_ms_script_prefix_ja = "ja:";
const char *_ms_script_prefix_kn = "kn:";
const char *_ms_script_prefix_lo = "lo:";
const char *_ms_script_prefix_ml = "ml:";
const char *_ms_script_prefix_mn = "mn:";
const char *_ms_script_prefix_or = "or:";
const char *_ms_script_prefix_syr= "syr:";
const char *_ms_script_prefix_ta = "ta:";
const char *_ms_script_prefix_te = "te:";
const char *_ms_script_prefix_th = "th:";
const char *_ms_script_prefix_bo = "bo:";
const char *_ms_script_prefix_am = "am:";
const char *_ms_script_prefix_km = "km:";
const char *_ms_script_prefix_my = "my:";
const char *_ms_script_prefix_si = "si:";
const char *_ms_script_prefix_dv = "dv:";
const char *_ms_script_prefix_bku= "bku:";
const char *_ms_script_prefix_hnn= "hnn:";
const char *_ms_script_prefix_tl = "tl:";
const char *_ms_script_prefix_tbw= "tbw:";
const char *_ms_script_prefix_uga= "uga:";
const char *_ms_script_prefix_bug= "bug:";
const char *_ms_script_prefix_peo= "peo:";
const char *_ms_script_prefix_syl= "syl:";
const char *_ms_script_prefix_nko= "nko:";
const char* prefix_from_script(hb_script_t script) {
switch(script) {
case HB_SCRIPT_LATIN: return _ms_script_prefix_en;
case HB_SCRIPT_ARABIC: return _ms_script_prefix_ar;
case HB_SCRIPT_HAN: return _ms_script_prefix_cn;
case HB_SCRIPT_ARMENIAN: return _ms_script_prefix_hy;
case HB_SCRIPT_BENGALI: return _ms_script_prefix_bn;
case HB_SCRIPT_CANADIAN_ABORIGINAL: return _ms_script_prefix_iu;
case HB_SCRIPT_CHEROKEE: return _ms_script_prefix_chr;
case HB_SCRIPT_COPTIC: return _ms_script_prefix_cop;
case HB_SCRIPT_CYRILLIC: return _ms_script_prefix_ru;
case HB_SCRIPT_DEVANAGARI: return _ms_script_prefix_hi;
case HB_SCRIPT_GEORGIAN: return _ms_script_prefix_ka;
case HB_SCRIPT_GREEK: return _ms_script_prefix_el;
case HB_SCRIPT_GUJARATI: return _ms_script_prefix_gu;
case HB_SCRIPT_GURMUKHI: return _ms_script_prefix_pa;
case HB_SCRIPT_HANGUL: return _ms_script_prefix_ko;
case HB_SCRIPT_HEBREW: return _ms_script_prefix_he;
case HB_SCRIPT_HIRAGANA: return _ms_script_prefix_ja;
case HB_SCRIPT_KANNADA: return _ms_script_prefix_kn;
case HB_SCRIPT_KATAKANA: return _ms_script_prefix_ja;
case HB_SCRIPT_LAO: return _ms_script_prefix_lo;
case HB_SCRIPT_MALAYALAM: return _ms_script_prefix_ml;
case HB_SCRIPT_MONGOLIAN: return _ms_script_prefix_mn;
case HB_SCRIPT_ORIYA: return _ms_script_prefix_or;
case HB_SCRIPT_SYRIAC: return _ms_script_prefix_syr;
case HB_SCRIPT_TAMIL: return _ms_script_prefix_ta;
case HB_SCRIPT_TELUGU: return _ms_script_prefix_te;
case HB_SCRIPT_THAI: return _ms_script_prefix_th;
case HB_SCRIPT_TIBETAN: return _ms_script_prefix_bo;
case HB_SCRIPT_ETHIOPIC: return _ms_script_prefix_am;
case HB_SCRIPT_KHMER: return _ms_script_prefix_km;
case HB_SCRIPT_MYANMAR: return _ms_script_prefix_my;
case HB_SCRIPT_SINHALA: return _ms_script_prefix_si;
case HB_SCRIPT_THAANA: return _ms_script_prefix_dv;
case HB_SCRIPT_BUHID: return _ms_script_prefix_bku;
case HB_SCRIPT_HANUNOO: return _ms_script_prefix_hnn;
case HB_SCRIPT_TAGALOG: return _ms_script_prefix_tl;
case HB_SCRIPT_TAGBANWA: return _ms_script_prefix_tbw;
case HB_SCRIPT_UGARITIC: return _ms_script_prefix_uga;
case HB_SCRIPT_BUGINESE: return _ms_script_prefix_bug;
case HB_SCRIPT_OLD_PERSIAN: return _ms_script_prefix_peo;
case HB_SCRIPT_SYLOTI_NAGRI: return _ms_script_prefix_syl;
case HB_SCRIPT_NKO: return _ms_script_prefix_nko;
default:
return NULL;
}
}
hb_feature_t hbfeatures[2] = {
{HB_TAG('v','e','r','t'),0,0,INT_MAX},
{HB_TAG('k','e','r','n'),0,0,INT_MAX}
};
static hb_bool_t _ms_get_glyph_func (hb_font_t *font, void *font_data,
hb_codepoint_t unicode, hb_codepoint_t variation_selector, hb_codepoint_t *glyph,
void *user_data)
{
/* first check our run, as we have probably already computed this */
int i;
struct _ms_hb_user_data *ud = font_data;
unsigned int *unicodes = ud->info->unicodes + ud->run->offset;
for(i=0; i<ud->run->length; i++) {
if(unicodes[i] == unicode) {
*glyph = *(ud->info->codepoints + ud->run->offset + i);
return *glyph != 0;
}
}
{
FT_Face ft_face = ud->run->face->face;
#ifdef HAVE_FT_FACE_GETCHARVARIANTINDEX
if ((variation_selector)) {
*glyph = FT_Face_GetCharVariantIndex (ft_face, unicode, variation_selector);
return *glyph != 0;
}
#endif
*glyph = FT_Get_Char_Index (ft_face, unicode);
return *glyph != 0;
}
}
static hb_position_t _ms_get_glyph_h_advance_func (hb_font_t *font, void *font_data,
hb_codepoint_t glyph, void *user_data)
{
struct _ms_hb_user_data *ud = font_data;
glyph_element *glyphc = msGetGlyphByIndex(ud->run->face,ud->glyph_size,glyph);
if(!glyphc)
return 0;
return glyphc->metrics.advance * 64;
}
static hb_position_t _ms_get_glyph_v_advance_func (hb_font_t *font, void *font_data,
hb_codepoint_t glyph, void *user_data)
{
return 0; /* we don't support vertical layouts */
}
#endif
int WARN_UNUSED check_single_font(fontSetObj *fontset, char *fontkey, text_run *run, TextInfo *glyphs, int ignore_missing) {
int i;
face_element *fcache = NULL;
if(fontset && fontkey) {
char *fontkey2 = strchr(fontkey,':'); /* try skipping prefix */
if(fontkey2) {
fcache = msGetFontFace(fontkey2+1, fontset);
}
}
if(!fcache)
fcache = msGetFontFace(fontkey, fontset);
run->face = fcache;
if(UNLIKELY(!fcache)) return MS_FAILURE;
for(i=0; i<run->length; i++) {
int codepoint = msGetGlyphIndex(fcache, glyphs->unicodes[run->offset+i]);
if(codepoint || ignore_missing)
glyphs->codepoints[run->offset+i] = codepoint;
else
return MS_FAILURE;
}
return MS_SUCCESS;
}
int WARN_UNUSED get_face_for_run(fontSetObj *fontset, char *fontlist, text_run *run, TextInfo *glyphs) {
char *startfont, *endfont;
int ok;
#if defined(USE_HARFBUZZ) && defined(USE_FRIBIDI)
const char *prefix = NULL;
#endif
if(!fontset || !fontlist) {
ok = check_single_font(fontset,fontlist,run,glyphs,0);
return MS_SUCCESS;
}
#if defined(USE_HARFBUZZ) && defined(USE_FRIBIDI)
if(run->rtl >= 0) {
prefix = prefix_from_script(run->script);
} else {
prefix = _ms_script_prefix_en;
}
if(prefix) {
/* we'll first look for a font who's prefixed by the current script prefix, e.g, given the
* fontlist "arial,ar:arialuni,cn:cjk" check the "cjk" font first for HAN scripts
*/
int prefixlen = strlen(prefix);
startfont = fontlist;
for(;;) {
if(!*startfont) break;
endfont = strchr(startfont,',');
if(!strncmp(startfont,prefix,prefixlen)) {
startfont += strlen(prefix);
if(endfont) *endfont = 0;
ok = check_single_font(fontset,startfont,run,glyphs,0);
if(endfont) {
*endfont = ',';
if(ok == MS_SUCCESS) return MS_SUCCESS;
startfont = endfont+1; /* go to next font in list */
} else {
if(ok == MS_SUCCESS) return MS_SUCCESS;
break;
}
}
if(endfont)
startfont = endfont+1;
else break;
}
}
#endif
/* no prefix, or prefix search didn't return satisfying result */
startfont = fontlist;
for(;;) {
if(!*startfont) break;
endfont = strchr(startfont,',');
if(endfont) *endfont = 0;
ok = check_single_font(fontset,startfont,run,glyphs,!endfont); /* ignore failing glyphs if we're using the last font in the list */
if(endfont) {
*endfont = ',';
if(ok == MS_SUCCESS) return MS_SUCCESS;
startfont = endfont+1; /* go to next font in list */
} else {
if(ok == MS_SUCCESS) return MS_SUCCESS;
break;
}
}
return MS_FAILURE;
}
#ifdef USE_HARFBUZZ
hb_font_t* get_hb_font(struct _ms_hb_user_data *font_data) {
face_element *fcache = font_data->run->face;
hb_font_element *hbf = fcache->hbfont;
FT_Face face = fcache->face;
int reqsize = MS_NINT(font_data->glyph_size *96.0 / 72.0);
if(reqsize != fcache->face->size->metrics.x_ppem) {
FT_Set_Pixel_Sizes(face,0,reqsize);
}
if(!hbf) {
hbf = msSmallMalloc(sizeof(hb_font_element));
hbf->hbparentfont = hb_ft_font_create(face,NULL);
hbf->hbfont = hb_font_create_sub_font(hbf->hbparentfont);
hbf->funcs = hb_font_funcs_create();
hb_font_funcs_set_glyph_h_advance_func(hbf->funcs, _ms_get_glyph_h_advance_func, NULL, NULL);
hb_font_funcs_set_glyph_func(hbf->funcs, _ms_get_glyph_func, NULL, NULL);
hb_font_funcs_set_glyph_v_advance_func(hbf->funcs, _ms_get_glyph_v_advance_func, NULL, NULL);
hbf->cursize = reqsize;
fcache->hbfont = hbf;
hb_font_set_funcs(hbf->hbfont, hbf->funcs, font_data, NULL);
} else {
if(hbf->cursize != reqsize) {
hb_font_set_scale (hbf->hbparentfont,
((uint64_t) face->size->metrics.x_scale * (uint64_t) face->units_per_EM) >> 16,
((uint64_t) face->size->metrics.y_scale * (uint64_t) face->units_per_EM) >> 16);
hb_font_set_ppem (hbf->hbparentfont, face->size->metrics.x_ppem, face->size->metrics.y_ppem);
hbf->cursize = reqsize;
}
}
hb_font_set_funcs_data(hbf->hbfont,font_data,NULL);
return hbf->hbfont;
}
/*
* Return non-zero (true) if the given unicode array contains
* only ASCII and ISO Latin-1 characters, otherwise return zero.
*/
int unicode_is_latin1(const unsigned int *unicode, long nglyphs)
{
long i;
for (i=0; i < nglyphs; i++) {
if(unicode[i] < 0x2B0) continue;
return 0;
}
return 1;
}
void get_scripts(unsigned int *cp, int len, hb_script_t *scripts) {
int i;
int backwards_scan = 0;
hb_unicode_funcs_t *ufuncs = hb_unicode_funcs_get_default();
hb_script_t last_script = HB_SCRIPT_UNKNOWN;
// determine script (forward scan)
for (i = 0; i < len; i++) {
scripts[i] = hb_unicode_script(ufuncs, cp[i]);
// common/inherit codepoints inherit script from context
if (scripts[i] == HB_SCRIPT_COMMON ||
scripts[i] == HB_SCRIPT_INHERITED) {
// unknown is not a valid context
if (last_script != HB_SCRIPT_UNKNOWN)
scripts[i] = last_script;
else
// do a backwards scan to check if next codepoint
// contains a valid script for context
backwards_scan = 1;
} else {
last_script = scripts[i];
}
}
// determine script (backwards scan, if needed)
last_script = HB_SCRIPT_UNKNOWN;
for (i = len - 1; i >= 0 && backwards_scan; i--) {
// common/inherit codepoints inherit script from context
if (scripts[i] == HB_SCRIPT_COMMON ||
scripts[i] == HB_SCRIPT_INHERITED) {
// unknown script is not a valid context
if (last_script != HB_SCRIPT_UNKNOWN)
scripts[i] = last_script;
} else {
last_script = scripts[i];
}
}
}
#endif
/* returns 1 if this is a codepoint we should skip. only checks \r for now */
static int skip_unicode(unsigned int unicode) {
switch(unicode) {
case '\r':
return 1;
break;
default:
return 0;
}
}
#define MS_RTL_LTR 0
#define MS_RTL_RTL 1
#define MS_RTL_MIXED 2
struct line_desc{
int length;
int rtl;
} ;
int msLayoutTextSymbol(mapObj *map, textSymbolObj *ts, textPathObj *tgret) {
#define STATIC_GLYPHS 100
#define STATIC_LINES 10
text_run static_runs[STATIC_GLYPHS];
int i,nruns, start, ret=MS_SUCCESS;
size_t text_num_bytes;
char *inp;
unsigned int static_unicodes[STATIC_GLYPHS];
unsigned int static_codepoints[STATIC_GLYPHS];
#ifdef USE_FRIBIDI
FriBidiCharType static_ctypes[STATIC_GLYPHS];
FriBidiLevel static_bidi_levels[STATIC_GLYPHS];
#endif
#ifdef USE_HARFBUZZ
hb_script_t static_scripts[STATIC_GLYPHS];
hb_buffer_t *buf = NULL;
#endif
struct line_desc static_line_descs[STATIC_LINES];
int alloc_glyphs = 0;
struct line_desc *line_descs = NULL;
text_run *runs;
double oldpeny=3455,peny,penx=0; /*oldpeny is set to an unreasonable default initial value */
fontSetObj *fontset = NULL;
TextInfo glyphs;
int num_glyphs = 0;
assert(ts->annotext && *ts->annotext); /* ensure we have at least one character/glyph to treat */
if(map) fontset = &map->fontset;
/* go through iconv beforehand, so we know we're handling utf8 */
#ifdef USE_ICONV
if(ts->label->encoding && strcasecmp(ts->label->encoding,"UTF-8")) {
iconv_t cd;
size_t len, iconv_status,bufleft;
char *encoded_text,*outp;
len = strlen(ts->annotext);
bufleft = len*6;
encoded_text = msSmallMalloc(bufleft+1);
cd = iconv_open("UTF-8", ts->label->encoding);
if(cd == (iconv_t)-1) {
msSetError(MS_IDENTERR, "Encoding not supported by libiconv (%s).",
"msGetEncodedString()", ts->label->encoding);
return MS_FAILURE;
}
inp = ts->annotext;
outp = encoded_text;
while(len>0) {
iconv_status = iconv(cd, &inp, &len, &outp, &bufleft);
if(iconv_status == -1) {
break;
}
}
text_num_bytes = outp - encoded_text;
encoded_text[text_num_bytes] = 0;
free(ts->annotext);
ts->annotext = encoded_text;
iconv_close(cd);
} else
#endif
{
text_num_bytes = strlen(ts->annotext);
}
if( text_num_bytes == 0 )
return 0;
if(text_num_bytes > STATIC_GLYPHS) {
#ifdef USE_FRIBIDI
glyphs.bidi_levels = msSmallMalloc(text_num_bytes * sizeof(FriBidiLevel));
glyphs.ctypes = msSmallMalloc(text_num_bytes * sizeof(FriBidiCharType));
#endif
glyphs.unicodes = msSmallMalloc(text_num_bytes * sizeof(unsigned int));
glyphs.codepoints = msSmallMalloc(text_num_bytes * sizeof(unsigned int));
#ifdef USE_HARFBUZZ
glyphs.scripts = msSmallMalloc(text_num_bytes * sizeof(hb_script_t));
#endif
runs = msSmallMalloc(text_num_bytes * sizeof(text_run));
} else {
#ifdef USE_FRIBIDI
glyphs.bidi_levels = static_bidi_levels;
glyphs.ctypes = static_ctypes;
#endif
glyphs.unicodes = static_unicodes;
glyphs.codepoints = static_codepoints;
#ifdef USE_HARFBUZZ
glyphs.scripts = static_scripts;
#endif
runs = static_runs;
}
/* populate the unicode entries once and for all */
inp = ts->annotext;
while(*inp) {
unsigned int unicode;
inp += msUTF8ToUniChar(inp, &unicode);
if(!skip_unicode(unicode)){
glyphs.unicodes[num_glyphs++] = unicode;
}
}
if(ts->label->wrap || ts->label->maxlength > 0) {
if(ts->label->wrap && ts->label->maxlength == 0) {
for(i=0;i<num_glyphs;i++) {
/* replace all occurences of the wrap character with a newline */
if(glyphs.unicodes[i]== ts->label->wrap)
glyphs.unicodes[i]= '\n';
}
} else {
assert(ts->label->maxlength > 0);
if(num_glyphs > ts->label->maxlength) {
int num_cur_glyph_on_line = 0; /*count for the number of glyphs on the current line*/
for(i=0; i<num_glyphs; i++) {
/* wrap at wrap character or at ZERO WIDTH SPACE (unicode 0x200b), if
* current line is too long */
if((glyphs.unicodes[i] == ts->label->wrap || glyphs.unicodes[i] == 0x200b)
&& num_cur_glyph_on_line >= ts->label->maxlength) {
glyphs.unicodes[i]= '\n';
num_cur_glyph_on_line = 0;
} else {
num_cur_glyph_on_line++;
}
}
}
}
/*
* TODO RFC98: RFC40 negative label->wrap. This is left out for the moment as it requires
* handling a realloc and imho is never used and is an overly-complex use-case.
*/
}
/* split our text into runs (one for each line) */
nruns = 0;
start = 0;
runs[0].offset = 0;
runs[0].line_number = 0;
for(i=0; i<num_glyphs; i++) {
if(glyphs.unicodes[i]!= '\n') continue;
runs[nruns].length = i - start; /* length of current line (without \n) */
start = i+1; /* start of next line */
runs[nruns+1].line_number = runs[nruns].line_number+1;
runs[nruns+1].offset = start;
nruns++;
}
/* unless the last glyph was a \n, we need to "close" the last run */
if(glyphs.unicodes[num_glyphs-1]!= '\n') {
runs[nruns].length = num_glyphs - start;
nruns++;
}
if(runs[nruns-1].line_number+1 > STATIC_LINES) {
line_descs = msSmallMalloc((runs[nruns-1].line_number + 1)*sizeof(struct line_desc));
} else {
line_descs = static_line_descs;
}
#ifdef USE_FRIBIDI
for(i=0;i<nruns;i++) {
/* check the run (at this stage, one run per line), decide if we need to go through bidi and/or shaping */
if(unicode_is_latin1(glyphs.unicodes + runs[i].offset, runs[i].length)) {
runs[i].rtl = -1;
line_descs[i].rtl = MS_RTL_LTR;
} else {
runs[i].rtl = 0;
}
}
for(i=0; i<nruns; i++) {
/* split the text into bidi runs */
if(runs[i].rtl >= 0) {
int j, cur_run_start, original_num_glyphs, original_offset;
FriBidiLevel prevlevel;
FriBidiParType dir = FRIBIDI_PAR_LTR;
original_offset = cur_run_start = runs[i].offset;
original_num_glyphs = runs[i].length;
fribidi_get_bidi_types(glyphs.unicodes + original_offset, runs[i].length, glyphs.ctypes + original_offset);
fribidi_get_par_embedding_levels(glyphs.ctypes + original_offset, runs[i].length, &dir, glyphs.bidi_levels + runs[i].offset);
/* if we have different embedding levels, create a run for each one */
runs[i].rtl = prevlevel = glyphs.bidi_levels[original_offset];
line_descs[runs[i].line_number].rtl = (prevlevel%2) ? MS_RTL_RTL:MS_RTL_LTR;
for(j=1; j<original_num_glyphs; j++) {
if(glyphs.bidi_levels[original_offset+j] != prevlevel) {
line_descs[runs[i].line_number].rtl = MS_RTL_MIXED;
/* create a new run for the different embedding level */
nruns++;
/* first move remaining runs */
memmove(runs+i+2,runs+i+1,(nruns-i-2)*sizeof(text_run));
i++;
/* new run inherints line number */
runs[i].line_number = runs[i-1].line_number;
runs[i].offset = original_offset + j;
runs[i].length = (runs[i-1].offset + runs[i-1].length) - runs[i].offset;
runs[i-1].length = runs[i].offset - runs[i-1].offset;
/* new run starts at current postition */
runs[i].rtl = prevlevel = glyphs.bidi_levels[original_offset+j];
}
}
}
}
#else
for(i=0;i<nruns;i++) {
line_descs[i].rtl = MS_RTL_LTR;
}
#endif
#ifdef USE_FRIBIDI
/* determine the scripts of each run, and split again into runs with identical script */
for(i=0; i<nruns; i++) {
if(runs[i].rtl == -1) {
runs[i].script = HB_SCRIPT_LATIN;
continue; /* skip runs we have determined we are latin (no shaping needed) */
} else {
int j, cur_run_start, original_num_glyphs, original_offset;
hb_script_t prevscript;
original_offset = cur_run_start = runs[i].offset;
original_num_glyphs = runs[i].length;
get_scripts(glyphs.unicodes + original_offset, runs[i].length, glyphs.scripts + original_offset);
/* if we have different scripts, create a run for each one */
runs[i].script = prevscript = glyphs.scripts[original_offset];
for(j=1; j<original_num_glyphs; j++) {
if(glyphs.scripts[original_offset+j] != prevscript) {
/* create a new run for the different embedding level */
nruns++;
/* first move remaining runs */
memmove(runs+i+2,runs+i+1,(nruns-i-2)*sizeof(text_run));
i++;
/* new run inherints line number and rtl*/
runs[i].line_number = runs[i-1].line_number;
runs[i].rtl = runs[i-1].rtl;
runs[i].offset = original_offset + j;
runs[i].length = (runs[i-1].offset + runs[i-1].length) - runs[i].offset;
runs[i-1].length = runs[i].offset - runs[i-1].offset;
runs[i].script = prevscript = glyphs.scripts[original_offset+j];
}
}
}
}
#endif
for(i=0; i<nruns; i++) {
ret = get_face_for_run(fontset, ts->label->font, runs+i, &glyphs);
if(UNLIKELY(ret == MS_FAILURE))
goto cleanup;
}
/*
* determine the font face to use for a given run. No splitting needed here for
* now, as we suppose that the decomposition of each run into individual bidi
* direction and script level is sufficient to ensure that a given run can be
* represented by a single font (i.e. there's no need to look into multiple fonts
* to find the glyphs of the run)
*/
tgret->numlines = runs[nruns-1].line_number + 1;
tgret->bounds.bbox.minx = 0;
tgret->bounds.bbox.miny = FLT_MAX;
tgret->bounds.bbox.maxx = tgret->bounds.bbox.maxy = -FLT_MAX;
for(i=0;i<nruns;i++) {
unsigned int glyph_count,j;
if(!runs[i].face) continue;
peny = (1 - tgret->numlines + runs[i].line_number) * tgret->line_height;
if(peny != oldpeny) {
if(i>0) line_descs[runs[i-1].line_number].length = penx;
if(penx > tgret->bounds.bbox.maxx)
tgret->bounds.bbox.maxx = penx;
oldpeny = peny;
penx = 0;
}
#if defined(USE_HARFBUZZ) && defined(USE_FRIBIDI)
if(runs[i].rtl == -1 || runs[i].script == HB_SCRIPT_LATIN || runs[i].script == HB_SCRIPT_COMMON)
#endif
{
/* use our basic shaper */
unsigned int *codepoint = glyphs.codepoints + runs[i].offset;
alloc_glyphs += runs[i].length;
tgret->glyphs = msSmallRealloc(tgret->glyphs, alloc_glyphs * sizeof(glyphObj));
for(j=0;j<runs[i].length;j++) {
glyphObj *g = &tgret->glyphs[tgret->numglyphs + j];
g->glyph = msGetGlyphByIndex(runs[i].face,tgret->glyph_size, *codepoint);
g->face = runs[i].face;
codepoint++;
g->pnt.x = penx;
g->pnt.y = peny;
g->rot = 0.0;
penx += g->glyph->metrics.advance;
if(runs[i].line_number == 0 && peny - g->glyph->metrics.maxy < tgret->bounds.bbox.miny) /*compute minimal y, only for the first line */
tgret->bounds.bbox.miny = peny - g->glyph->metrics.maxy;
if(peny - g->glyph->metrics.miny > tgret->bounds.bbox.maxy)
tgret->bounds.bbox.maxy = peny - g->glyph->metrics.miny;
}
#if defined(USE_HARFBUZZ) && defined(USE_FRIBIDI)
} else {
struct _ms_hb_user_data user_data;
hb_font_t *font;
hb_glyph_info_t *glyph_info;
hb_glyph_position_t *glyph_pos;
if(!buf) {
buf = hb_buffer_create();
}
user_data.info = &glyphs;
user_data.run = runs + i;
user_data.glyph_size = tgret->glyph_size;
hb_buffer_clear_contents(buf);
hb_buffer_set_script (buf, runs[i].script);
font = get_hb_font(&user_data);
hb_buffer_set_direction(buf, (runs[i].rtl%2) ? HB_DIRECTION_RTL :HB_DIRECTION_LTR);
hb_buffer_add_utf32(buf,glyphs.unicodes + runs[i].offset, runs[i].length, 0, runs[i].length);
hb_shape(font,buf,hbfeatures,2);
glyph_info = hb_buffer_get_glyph_infos(buf, &glyph_count);
glyph_pos = hb_buffer_get_glyph_positions(buf, &glyph_count);
alloc_glyphs += glyph_count;
tgret->glyphs = msSmallRealloc(tgret->glyphs, alloc_glyphs * sizeof(glyphObj));
for(j=0;j<glyph_count;j++) {
glyphObj *g = &tgret->glyphs[tgret->numglyphs + j];
g->glyph = msGetGlyphByIndex(runs[i].face,tgret->glyph_size,glyph_info[j].codepoint);
g->face = runs[i].face;
g->pnt.x = penx + glyph_pos[j].x_offset/64;
g->pnt.y = peny - glyph_pos[j].y_offset/64;
g->rot = 0;
penx += glyph_pos[j].x_advance/64.0;
/* peny -= glyph_pos[j].y_advance/64; // we don't do vertical layouts */
if(runs[i].line_number == 0 && peny - g->glyph->metrics.maxy < tgret->bounds.bbox.miny) /*compute minimal y, only for the first line */
tgret->bounds.bbox.miny = peny - g->glyph->metrics.maxy;
if(peny - g->glyph->metrics.miny > tgret->bounds.bbox.maxy)
tgret->bounds.bbox.maxy = peny - g->glyph->metrics.miny;
}
#endif
}
tgret->numglyphs = alloc_glyphs;
line_descs[runs[nruns-1].line_number].length = penx;
if(penx > tgret->bounds.bbox.maxx)
tgret->bounds.bbox.maxx = penx;
}
#ifdef USE_HARFBUZZ
if(buf) {
hb_buffer_destroy(buf);
}
#endif
if(tgret->numlines > 1) {
int max_line_length = 0;
int line = -1;
double cur_line_offset = 0;
int prev_default_align = MS_ALIGN_LEFT; /* if we have mixed rtl status, use the alignment of the previous
line. this defaults to left-alignment if the first line is mixed */
int cur_default_align = 0;
for(i=0; i<tgret->numlines; i++) {
if(line_descs[i].length > max_line_length) {
max_line_length = line_descs[i].length;
}
}
oldpeny = 3455;
for(i=0; i<alloc_glyphs; i++) {
if(tgret->glyphs[i].pnt.y != oldpeny) {
oldpeny = tgret->glyphs[i].pnt.y;
line++;
/* compute offset to apply to coming line */
switch(ts->label->align) {
case MS_ALIGN_CENTER:
cur_line_offset = (max_line_length - line_descs[line].length)/2.0;
break;
case MS_ALIGN_RIGHT:
cur_line_offset = (max_line_length - line_descs[line].length);
break;
case MS_ALIGN_LEFT:
cur_line_offset = 0;
break;
case MS_ALIGN_DEFAULT:
default:
switch(line_descs[line].rtl) {
case MS_RTL_MIXED:
cur_default_align = prev_default_align;
break;
case MS_RTL_RTL:
cur_default_align = prev_default_align = MS_RTL_RTL;
break;
case MS_RTL_LTR:
cur_default_align = prev_default_align = MS_RTL_LTR;
break;
}
switch(cur_default_align) {
case MS_RTL_RTL:
/* align to the right */
cur_line_offset = (max_line_length - line_descs[line].length);
break;
case MS_RTL_LTR:
cur_line_offset = 0;
break;
}
}
}
tgret->glyphs[i].pnt.x += cur_line_offset;
}
}
/*
* msDebug("bounds for %s: %f %f %f %f\n",ts->annotext,tgret->bounds.bbox.minx,tgret->bounds.bbox.miny,tgret->bounds.bbox.maxx,tgret->bounds.bbox.maxy);
*/
cleanup:
if(line_descs != static_line_descs) free(line_descs);
if(glyphs.codepoints != static_codepoints) {
#ifdef USE_FRIBIDI
free(glyphs.bidi_levels);
free(glyphs.ctypes);
#endif
free(glyphs.codepoints);
#ifdef USE_HARFBUZZ
free(glyphs.scripts);
#endif
free(glyphs.unicodes);
free(runs);
}
return ret;
}
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