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/* 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) 2002-2009 Jan-Åke Larsson
************************************************************************/
#include "dvipng.h"
void LoadFT(int32_t c, struct char_entry * ptr)
{
FT_Bitmap bitmap;
FT_UInt glyph_i;
int i,j,k;
unsigned char* bit;
static bool hintwarning=false;
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 */
if (!hintwarning) {
hintwarning=true;
Warning("the used FreeType does not have target_light hinting");
}
if (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 malloc 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);
}
static 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++;
}
if (tfontp->name!=NULL)
free(tfontp->name);
tfontp->name=NULL;
}
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