summaryrefslogtreecommitdiff
path: root/Build/source/texk/dvipng/ft.c
blob: dceff74bf7572d8cecc1a727735e54a41811bd60 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
/* ft.c */

/************************************************************************

  Part of the dvipng distribution

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as
  published by the Free Software Foundation, either version 3 of the
  License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this program. If not, see
  <http://www.gnu.org/licenses/>.

  Copyright (C) 2002-2008 Jan-Åke Larsson

************************************************************************/

#include "dvipng.h"
#ifdef HAVE_ALLOCA_H
# include <alloca.h>
#endif

void LoadFT(int32_t c, struct char_entry * ptr)
{
  FT_Bitmap  bitmap;
  FT_UInt    glyph_i;
  int i,j,k;
  unsigned char* bit;

  DEBUG_PRINT(DEBUG_FT,("\n  LOAD FT CHAR\t%d (%d)",c,ptr->tfmw));
  if (currentfont->psfontmap!=NULL
      && currentfont->psfontmap->encoding != NULL) {
    DEBUG_PRINT(DEBUG_FT,(" %s",currentfont->psfontmap->encoding->charname[c]));
    glyph_i = FT_Get_Name_Index(currentfont->face,
				currentfont->psfontmap->encoding->charname[c]);
  } else if (currentfont->psfontmap!=NULL
	     && currentfont->psfontmap->subfont != NULL) {
    glyph_i = FT_Get_Char_Index( currentfont->face, 
				 currentfont->psfontmap->subfont->charindex[c] );
    DEBUG_PRINT(DEBUG_FT,(" 0x%X",currentfont->psfontmap->subfont->charindex[c]));
  } else
    glyph_i = FT_Get_Char_Index( currentfont->face, c );
  if (FT_Load_Glyph( currentfont->face, glyph_i,
		     FT_LOAD_RENDER | FT_LOAD_TARGET_LIGHT )
      /* On some configurations (with FreeType <= 2.1.7) the above
	 fails, while the below works */
      && FT_Load_Glyph( currentfont->face, glyph_i,
			FT_LOAD_RENDER | FT_LOAD_NO_HINTING ))
    Fatal("cannot load FT char %d",c);
  ptr->xOffset = -currentfont->face->glyph->bitmap_left*shrinkfactor;
  ptr->yOffset = (currentfont->face->glyph->bitmap_top-1)*shrinkfactor;
  bitmap=currentfont->face->glyph->bitmap;
  DEBUG_PRINT(DEBUG_FT,(" (%dx%d)",bitmap.width,bitmap.rows));
    
  if ((ptr->data = calloc(bitmap.width*bitmap.rows,sizeof(char))) == NULL)
    Fatal("unable to allocate image space for char %c", (char)c);
  ptr->w = bitmap.width;
  ptr->h = bitmap.rows;

#define GREYLEVELS 16
  DEBUG_PRINT(DEBUG_GLYPH,("\nDRAW GLYPH %d\n", (int)c));
  bit=ptr->data;
  for(i=0;i<bitmap.rows;i++) {
    for(j=0;j<bitmap.width;j++) {
      k=bitmap.buffer[i*bitmap.pitch+j]/(256/GREYLEVELS)*17;
      /* k=(bitmap.buffer[i*bitmap.pitch+j]+1)/16; */
      /* k= k>0 ? k*16-1 : 0; */
      DEBUG_PRINT(DEBUG_GLYPH,("%3u ",k));
      bit[i*bitmap.width+j]=k;
    }
    DEBUG_PRINT(DEBUG_GLYPH,("|\n"));
  }
}

bool InitFT(struct font_entry * tfontp)
{
  int error;

  if (libfreetype==NULL) {
    if (FT_Init_FreeType( &libfreetype )) {
      Warning("an error occured during freetype initialisation, disabling it"); 
      option_flags &= ~USE_FREETYPE;
      return(false);
    } 
# ifdef DEBUG
    else {
      FT_Int      amajor, aminor, apatch;

      DEBUG_PRINT(DEBUG_FT,("\n  COMPILED WITH FREETYPE %d.%d.%d",
		 FREETYPE_MAJOR, FREETYPE_MINOR, FREETYPE_PATCH));
#  ifdef HAVE_FT_LIBRARY_VERSION	    
      FT_Library_Version( libfreetype, &amajor, &aminor, &apatch );
      DEBUG_PRINT(DEBUG_FT,("\n  USING LIBFT %d.%d.%d",
			    amajor, aminor, apatch));
#  endif
    }
# endif
  }
  DEBUG_PRINT((DEBUG_DVI|DEBUG_FT),("\n  OPEN FT FONT:\t'%s'", tfontp->name));
  error = FT_New_Face( libfreetype, tfontp->name, 0, &tfontp->face );
  if (error == FT_Err_Unknown_File_Format) {
    Warning("font file %s has unknown format", tfontp->name);
    return(false);
  } else if (error) { 
    Warning("font file %s could not be opened", tfontp->name);
    return(false);
  } 
  Message(BE_VERBOSE,"<%s>", tfontp->name);
  if (tfontp->psfontmap != NULL && tfontp->psfontmap->subfont != NULL)
    error=FT_Select_Charmap(tfontp->face, tfontp->psfontmap->subfont->encoding);
  else if (tfontp->psfontmap == NULL || tfontp->psfontmap->encoding == NULL)
#ifndef FT_ENCODING_ADOBE_CUSTOM
# define FT_ENCODING_ADOBE_CUSTOM ft_encoding_adobe_custom
# define FT_ENCODING_ADOBE_STANDARD ft_encoding_adobe_standard
#endif
    error=FT_Select_Charmap(tfontp->face, FT_ENCODING_ADOBE_CUSTOM);
  if (error) {
    Warning("unable to set font encoding for %s", tfontp->name);
    if(FT_Select_Charmap( tfontp->face, FT_ENCODING_ADOBE_STANDARD )) {
      Warning("unable to set fallback font encoding for %s", tfontp->name);
      return(false);
    }
  }
  if (FT_Set_Char_Size( tfontp->face, /* handle to face object           */
			0,            /* char_width in 1/64th of points  */
			((int64_t)tfontp->d*64*7200)/7227/65536,
			/* char_height in 1/64th of _big_points, 
			   not TeX points */
			tfontp->dpi/shrinkfactor,   /* horizontal resolution */
			tfontp->dpi/shrinkfactor )) /* vertical resolution   */ {
    Warning("unable to set font size for %s", tfontp->name);
    return(false);
  }
  if (tfontp->psfontmap!=NULL)
    FT_Set_Transform(tfontp->face, tfontp->psfontmap->ft_transformp, NULL);
  tfontp->type = FONT_TYPE_FT;
  return(true);
}


void UnLoadFT(struct char_entry *ptr)
{
  if (ptr->data!=NULL)
    free(ptr->data);
  ptr->data=NULL;
}


void DoneFT(struct font_entry *tfontp)
{
  int c=0;

  int error = FT_Done_Face( tfontp->face );
  if (error)
    Warning("font file %s could not be closed", tfontp->name);
  while(c<NFNTCHARS) {
    if (tfontp->chr[c]!=NULL) {
      UnLoadFT((struct char_entry*)tfontp->chr[c]);
      free(tfontp->chr[c]);
      tfontp->chr[c]=NULL;
    }
    c++;
  }
  tfontp->name[0]='\0';
}