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font.c
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font.c
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#include "imager.h"
#include "imrender.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_LIBT1
#include <t1lib.h>
#endif
/*
=head1 NAME
font.c - implements font handling functions for t1 and truetype fonts
=head1 SYNOPSIS
i_init_fonts();
#ifdef HAVE_LIBT1
fontnum = i_t1_new(path_to_pfb, path_to_afm);
i_t1_bbox(fontnum, points, "foo", 3, int cords[6]);
rc = i_t1_destroy(fontnum);
#endif
#ifdef HAVE_LIBTT
handle = i_tt_new(path_to_ttf);
rc = i_tt_bbox(handle, points, "foo", 3, int cords[6], utf8);
i_tt_destroy(handle);
// and much more
=head1 DESCRIPTION
font.c implements font creation, rendering, bounding box functions and
more for Imager.
=head1 FUNCTION REFERENCE
Some of these functions are internal.
=over
=cut
*/
/*
=item i_init_fonts()
Initialize font rendering libraries if they are avaliable.
=cut
*/
undef_int
i_init_fonts(int t1log) {
mm_log((1,"Initializing fonts\n"));
#ifdef HAVE_LIBT1
if (i_init_t1(t1log))
return 0;
#endif
return(1); /* FIXME: Always true - check the return values of the init_t1 and init_tt functions */
}
#ifdef HAVE_LIBT1
static int t1_get_flags(char const *flags);
static char *t1_from_utf8(char const *in, int len, int *outlen);
static void t1_push_error(void);
static int t1_active_fonts = 0;
static int t1_initialized = 0;
/*
=item i_init_t1(t1log)
Initializes the t1lib font rendering engine.
=cut
*/
undef_int
i_init_t1(int t1log) {
int init_flags = IGNORE_CONFIGFILE|IGNORE_FONTDATABASE;
mm_log((1,"init_t1()\n"));
i_clear_error();
if (t1_active_fonts) {
mm_log((1, "Cannot re-initialize T1 - active fonts\n"));
i_push_error(0, "Cannot re-initialize T1 - active fonts");
return 1;
}
if (t1_initialized) {
T1_CloseLib();
}
if (t1log)
init_flags |= LOGFILE;
if ((T1_InitLib(init_flags) == NULL)){
mm_log((1,"Initialization of t1lib failed\n"));
i_push_error(0, "T1_InitLib failed");
return(1);
}
T1_SetLogLevel(T1LOG_DEBUG);
i_t1_set_aa(1); /* Default Antialias value */
++t1_initialized;
return(0);
}
/*
=item i_close_t1()
Shuts the t1lib font rendering engine down.
This it seems that this function is never used.
=cut
*/
void
i_close_t1(void) {
T1_CloseLib();
t1_initialized = 0;
}
/*
=item i_t1_new(pfb, afm)
Loads the fonts with the given filenames, returns its font id
pfb - path to pfb file for font
afm - path to afm file for font
=cut
*/
int
i_t1_new(char *pfb,char *afm) {
int font_id;
i_clear_error();
if (!t1_initialized && i_init_t1(0))
return -1;
mm_log((1,"i_t1_new(pfb %s,afm %s)\n",pfb,(afm?afm:"NULL")));
font_id = T1_AddFont(pfb);
if (font_id<0) {
mm_log((1,"i_t1_new: Failed to load pfb file '%s' - return code %d.\n",pfb,font_id));
return font_id;
}
if (afm != NULL) {
mm_log((1,"i_t1_new: requesting afm file '%s'.\n",afm));
if (T1_SetAfmFileName(font_id,afm)<0) mm_log((1,"i_t1_new: afm loading of '%s' failed.\n",afm));
}
++t1_active_fonts;
return font_id;
}
/*
=item i_t1_destroy(font_id)
Frees resources for a t1 font with given font id.
font_id - number of the font to free
=cut
*/
int
i_t1_destroy(int font_id) {
mm_log((1,"i_t1_destroy(font_id %d)\n",font_id));
--t1_active_fonts;
return T1_DeleteFont(font_id);
}
/*
=item i_t1_set_aa(st)
Sets the antialiasing level of the t1 library.
st - 0 = NONE, 1 = LOW, 2 = HIGH.
=cut
*/
void
i_t1_set_aa(int st) {
int i;
unsigned long cst[17];
switch(st) {
case 0:
T1_AASetBitsPerPixel( 8 );
T1_AASetLevel( T1_AA_NONE );
T1_AANSetGrayValues( 0, 255 );
mm_log((1,"setting T1 antialias to none\n"));
break;
case 1:
T1_AASetBitsPerPixel( 8 );
T1_AASetLevel( T1_AA_LOW );
T1_AASetGrayValues( 0,65,127,191,255 );
mm_log((1,"setting T1 antialias to low\n"));
break;
case 2:
T1_AASetBitsPerPixel(8);
T1_AASetLevel(T1_AA_HIGH);
for(i=0;i<17;i++) cst[i]=(i*255)/16;
T1_AAHSetGrayValues( cst );
mm_log((1,"setting T1 antialias to high\n"));
}
}
/*
=item i_t1_cp(im, xb, yb, channel, fontnum, points, str, len, align)
Interface to text rendering into a single channel in an image
im pointer to image structure
xb x coordinate of start of string
yb y coordinate of start of string ( see align )
channel - destination channel
fontnum - t1 library font id
points - number of points in fontheight
str - string to render
len - string length
align - (0 - top of font glyph | 1 - baseline )
=cut
*/
undef_int
i_t1_cp(i_img *im,int xb,int yb,int channel,int fontnum,float points,char* str,int len,int align, int utf8, char const *flags) {
GLYPH *glyph;
int xsize,ysize,x,y;
i_color val;
int mod_flags = t1_get_flags(flags);
unsigned int ch_mask_store;
if (im == NULL) { mm_log((1,"i_t1_cp: Null image in input\n")); return(0); }
if (utf8) {
int worklen;
char *work = t1_from_utf8(str, len, &worklen);
glyph=T1_AASetString( fontnum, work, worklen, 0, mod_flags, points, NULL);
myfree(work);
}
else {
glyph=T1_AASetString( fontnum, str, len, 0, mod_flags, points, NULL);
}
if (glyph == NULL)
return 0;
mm_log((1,"metrics: ascent: %d descent: %d\n",glyph->metrics.ascent,glyph->metrics.descent));
mm_log((1," leftSideBearing: %d rightSideBearing: %d\n",glyph->metrics.leftSideBearing,glyph->metrics.rightSideBearing));
mm_log((1," advanceX: %d advanceY: %d\n",glyph->metrics.advanceX,glyph->metrics.advanceY));
mm_log((1,"bpp: %d\n",glyph->bpp));
xsize=glyph->metrics.rightSideBearing-glyph->metrics.leftSideBearing;
ysize=glyph->metrics.ascent-glyph->metrics.descent;
mm_log((1,"width: %d height: %d\n",xsize,ysize));
ch_mask_store=im->ch_mask;
im->ch_mask=1<<channel;
if (align==1) { xb+=glyph->metrics.leftSideBearing; yb-=glyph->metrics.ascent; }
for(y=0;y<ysize;y++) for(x=0;x<xsize;x++) {
val.channel[channel]=glyph->bits[y*xsize+x];
i_ppix(im,x+xb,y+yb,&val);
}
im->ch_mask=ch_mask_store;
return 1;
}
static void
t1_fix_bbox(BBox *bbox, const char *str, int len, int advance,
int space_position) {
/* never called with len == 0 */
if (str[0] == space_position && bbox->llx > 0)
bbox->llx = 0;
if (str[len-1] == space_position && bbox->urx < advance)
bbox->urx = advance;
if (bbox->lly > bbox->ury)
bbox->lly = bbox->ury = 0;
}
/*
=item i_t1_bbox(handle, fontnum, points, str, len, cords)
function to get a strings bounding box given the font id and sizes
handle - pointer to font handle
fontnum - t1 library font id
points - number of points in fontheight
str - string to measure
len - string length
cords - the bounding box (modified in place)
=cut
*/
int
i_t1_bbox(int fontnum,float points,const char *str,int len,int cords[6], int utf8,char const *flags) {
BBox bbox;
BBox gbbox;
int mod_flags = t1_get_flags(flags);
int advance;
int space_position = T1_GetEncodingIndex(fontnum, "space");
mm_log((1,"i_t1_bbox(fontnum %d,points %.2f,str '%.*s', len %d)\n",fontnum,points,len,str,len));
T1_LoadFont(fontnum); /* FIXME: Here a return code is ignored - haw haw haw */
if (len == 0) {
/* len == 0 has special meaning to T1lib, but it means there's
nothing to draw, so return that */
bbox.llx = bbox.lly = bbox.urx = bbox.ury = 0;
advance = 0;
}
else {
if (utf8) {
int worklen;
char *work = t1_from_utf8(str, len, &worklen);
advance = T1_GetStringWidth(fontnum, work, worklen, 0, mod_flags);
bbox = T1_GetStringBBox(fontnum,work,worklen,0,mod_flags);
t1_fix_bbox(&bbox, work, worklen, advance, space_position);
myfree(work);
}
else {
advance = T1_GetStringWidth(fontnum, (char *)str, len, 0, mod_flags);
bbox = T1_GetStringBBox(fontnum,(char *)str,len,0,mod_flags);
t1_fix_bbox(&bbox, str, len, advance, space_position);
}
}
gbbox = T1_GetFontBBox(fontnum);
mm_log((1,"bbox: (%d,%d,%d,%d)\n",
(int)(bbox.llx*points/1000),
(int)(gbbox.lly*points/1000),
(int)(bbox.urx*points/1000),
(int)(gbbox.ury*points/1000),
(int)(bbox.lly*points/1000),
(int)(bbox.ury*points/1000) ));
cords[BBOX_NEG_WIDTH]=((float)bbox.llx*points)/1000;
cords[BBOX_POS_WIDTH]=((float)bbox.urx*points)/1000;
cords[BBOX_GLOBAL_DESCENT]=((float)gbbox.lly*points)/1000;
cords[BBOX_GLOBAL_ASCENT]=((float)gbbox.ury*points)/1000;
cords[BBOX_DESCENT]=((float)bbox.lly*points)/1000;
cords[BBOX_ASCENT]=((float)bbox.ury*points)/1000;
cords[BBOX_ADVANCE_WIDTH] = ((float)advance * points)/1000;
cords[BBOX_RIGHT_BEARING] =
cords[BBOX_ADVANCE_WIDTH] - cords[BBOX_POS_WIDTH];
return BBOX_RIGHT_BEARING+1;
}
/*
=item i_t1_text(im, xb, yb, cl, fontnum, points, str, len, align)
Interface to text rendering in a single color onto an image
im - pointer to image structure
xb - x coordinate of start of string
yb - y coordinate of start of string ( see align )
cl - color to draw the text in
fontnum - t1 library font id
points - number of points in fontheight
str - char pointer to string to render
len - string length
align - (0 - top of font glyph | 1 - baseline )
=cut
*/
undef_int
i_t1_text(i_img *im,int xb,int yb,const i_color *cl,int fontnum,float points,const char* str,int len,int align, int utf8, char const *flags) {
GLYPH *glyph;
int xsize,ysize,y;
int mod_flags = t1_get_flags(flags);
i_render r;
if (im == NULL) { mm_log((1,"i_t1_cp: Null image in input\n")); return(0); }
if (utf8) {
int worklen;
char *work = t1_from_utf8(str, len, &worklen);
glyph=T1_AASetString( fontnum, work, worklen, 0, mod_flags, points, NULL);
myfree(work);
}
else {
/* T1_AASetString() accepts a char * not a const char */
glyph=T1_AASetString( fontnum, (char *)str, len, 0, mod_flags, points, NULL);
}
if (glyph == NULL)
return 0;
mm_log((1,"metrics: ascent: %d descent: %d\n",glyph->metrics.ascent,glyph->metrics.descent));
mm_log((1," leftSideBearing: %d rightSideBearing: %d\n",glyph->metrics.leftSideBearing,glyph->metrics.rightSideBearing));
mm_log((1," advanceX: %d advanceY: %d\n",glyph->metrics.advanceX,glyph->metrics.advanceY));
mm_log((1,"bpp: %d\n",glyph->bpp));
xsize=glyph->metrics.rightSideBearing-glyph->metrics.leftSideBearing;
ysize=glyph->metrics.ascent-glyph->metrics.descent;
mm_log((1,"width: %d height: %d\n",xsize,ysize));
if (align==1) { xb+=glyph->metrics.leftSideBearing; yb-=glyph->metrics.ascent; }
i_render_init(&r, im, xsize);
for(y=0;y<ysize;y++) {
i_render_color(&r, xb, yb+y, xsize, (unsigned char *)glyph->bits+y*xsize, cl);
}
i_render_done(&r);
return 1;
}
/*
=item t1_get_flags(flags)
Processes the characters in I<flags> to create a mod_flags value used
by some T1Lib functions.
=cut
*/
static int
t1_get_flags(char const *flags) {
int mod_flags = T1_KERNING;
while (*flags) {
switch (*flags++) {
case 'u': case 'U': mod_flags |= T1_UNDERLINE; break;
case 'o': case 'O': mod_flags |= T1_OVERLINE; break;
case 's': case 'S': mod_flags |= T1_OVERSTRIKE; break;
/* ignore anything we don't recognize */
}
}
return mod_flags;
}
/*
=item t1_from_utf8(char const *in, int len, int *outlen)
Produces an unencoded version of I<in> by dropping any Unicode
character over 255.
Returns a newly allocated buffer which should be freed with myfree().
Sets *outlen to the number of bytes used in the output string.
=cut
*/
static char *
t1_from_utf8(char const *in, int len, int *outlen) {
/* at this point len is from a perl SV, so can't approach MAXINT */
char *out = mymalloc(len+1); /* checked 5Nov05 tonyc */
char *p = out;
unsigned long c;
while (len) {
c = i_utf8_advance(&in, &len);
if (c == ~0UL) {
myfree(out);
i_push_error(0, "invalid UTF8 character");
return 0;
}
/* yeah, just drop them */
if (c < 0x100) {
*p++ = (char)c;
}
}
*p = '\0';
*outlen = p - out;
return out;
}
/*
=item i_t1_has_chars(font_num, text, len, utf8, out)
Check if the given characters are defined by the font. Note that len
is the number of bytes, not the number of characters (when utf8 is
non-zero).
out[char index] will be true if the character exists.
Accepts UTF-8, but since T1 can only have 256 characters, any chars
with values over 255 will simply be returned as false.
Returns the number of characters that were checked.
=cut
*/
int
i_t1_has_chars(int font_num, const char *text, int len, int utf8,
char *out) {
int count = 0;
mm_log((1, "i_t1_has_chars(font_num %d, text %p, len %d, utf8 %d)\n",
font_num, text, len, utf8));
i_clear_error();
if (T1_LoadFont(font_num)) {
t1_push_error();
return 0;
}
while (len) {
unsigned long c;
if (utf8) {
c = i_utf8_advance(&text, &len);
if (c == ~0UL) {
i_push_error(0, "invalid UTF8 character");
return 0;
}
}
else {
c = (unsigned char)*text++;
--len;
}
if (c >= 0x100) {
/* limit of 256 characters for T1 */
*out++ = 0;
}
else {
char const * name = T1_GetCharName(font_num, (unsigned char)c);
if (name) {
*out++ = strcmp(name, ".notdef") != 0;
}
else {
mm_log((2, " No name found for character %lx\n", c));
*out++ = 0;
}
}
++count;
}
return count;
}
/*
=item i_t1_face_name(font_num, name_buf, name_buf_size)
Copies the face name of the given C<font_num> to C<name_buf>. Returns
the number of characters required to store the name (which can be
larger than C<name_buf_size>, including the space required to store
the terminating NUL).
If name_buf is too small (as specified by name_buf_size) then the name
will be truncated. name_buf will always be NUL termintaed.
=cut
*/
int
i_t1_face_name(int font_num, char *name_buf, size_t name_buf_size) {
char *name;
T1_errno = 0;
if (T1_LoadFont(font_num)) {
t1_push_error();
return 0;
}
name = T1_GetFontName(font_num);
if (name) {
strncpy(name_buf, name, name_buf_size);
name_buf[name_buf_size-1] = '\0';
return strlen(name) + 1;
}
else {
t1_push_error();
return 0;
}
}
int
i_t1_glyph_name(int font_num, unsigned long ch, char *name_buf,
size_t name_buf_size) {
char *name;
i_clear_error();
if (ch > 0xFF) {
return 0;
}
if (T1_LoadFont(font_num)) {
t1_push_error();
return 0;
}
name = T1_GetCharName(font_num, (unsigned char)ch);
if (name) {
if (strcmp(name, ".notdef")) {
strncpy(name_buf, name, name_buf_size);
name_buf[name_buf_size-1] = '\0';
return strlen(name) + 1;
}
else {
return 0;
}
}
else {
t1_push_error();
return 0;
}
}
static void
t1_push_error(void) {
switch (T1_errno) {
case 0:
i_push_error(0, "No error");
break;
#ifdef T1ERR_SCAN_FONT_FORMAT
case T1ERR_SCAN_FONT_FORMAT:
i_push_error(T1ERR_SCAN_FONT_FORMAT, "SCAN_FONT_FORMAT");
break;
#endif
#ifdef T1ERR_SCAN_FILE_OPEN_ERR
case T1ERR_SCAN_FILE_OPEN_ERR:
i_push_error(T1ERR_SCAN_FILE_OPEN_ERR, "SCAN_FILE_OPEN_ERR");
break;
#endif
#ifdef T1ERR_SCAN_OUT_OF_MEMORY
case T1ERR_SCAN_OUT_OF_MEMORY:
i_push_error(T1ERR_SCAN_OUT_OF_MEMORY, "SCAN_OUT_OF_MEMORY");
break;
#endif
#ifdef T1ERR_SCAN_ERROR
case T1ERR_SCAN_ERROR:
i_push_error(T1ERR_SCAN_ERROR, "SCAN_ERROR");
break;
#endif
#ifdef T1ERR_SCAN_FILE_EOF
case T1ERR_SCAN_FILE_EOF:
i_push_error(T1ERR_SCAN_FILE_EOF, "SCAN_FILE_EOF");
break;
#endif
#ifdef T1ERR_PATH_ERROR
case T1ERR_PATH_ERROR:
i_push_error(T1ERR_PATH_ERROR, "PATH_ERROR");
break;
#endif
#ifdef T1ERR_PARSE_ERROR
case T1ERR_PARSE_ERROR:
i_push_error(T1ERR_PARSE_ERROR, "PARSE_ERROR");
break;
#endif
#ifdef T1ERR_TYPE1_ABORT
case T1ERR_TYPE1_ABORT:
i_push_error(T1ERR_TYPE1_ABORT, "TYPE1_ABORT");
break;
#endif
#ifdef T1ERR_INVALID_FONTID
case T1ERR_INVALID_FONTID:
i_push_error(T1ERR_INVALID_FONTID, "INVALID_FONTID");
break;
#endif
#ifdef T1ERR_INVALID_PARAMETER
case T1ERR_INVALID_PARAMETER:
i_push_error(T1ERR_INVALID_PARAMETER, "INVALID_PARAMETER");
break;
#endif
#ifdef T1ERR_OP_NOT_PERMITTED
case T1ERR_OP_NOT_PERMITTED:
i_push_error(T1ERR_OP_NOT_PERMITTED, "OP_NOT_PERMITTED");
break;
#endif
#ifdef T1ERR_ALLOC_MEM
case T1ERR_ALLOC_MEM:
i_push_error(T1ERR_ALLOC_MEM, "ALLOC_MEM");
break;
#endif
#ifdef T1ERR_FILE_OPEN_ERR
case T1ERR_FILE_OPEN_ERR:
i_push_error(T1ERR_FILE_OPEN_ERR, "FILE_OPEN_ERR");
break;
#endif
#ifdef T1ERR_UNSPECIFIED
case T1ERR_UNSPECIFIED:
i_push_error(T1ERR_UNSPECIFIED, "UNSPECIFIED");
break;
#endif
#ifdef T1ERR_NO_AFM_DATA
case T1ERR_NO_AFM_DATA:
i_push_error(T1ERR_NO_AFM_DATA, "NO_AFM_DATA");
break;
#endif
#ifdef T1ERR_X11
case T1ERR_X11:
i_push_error(T1ERR_X11, "X11");
break;
#endif
#ifdef T1ERR_COMPOSITE_CHAR
case T1ERR_COMPOSITE_CHAR:
i_push_error(T1ERR_COMPOSITE_CHAR, "COMPOSITE_CHAR");
break;
#endif
default:
i_push_errorf(T1_errno, "unknown error %d", (int)T1_errno);
}
}
#endif /* HAVE_LIBT1 */
/* Truetype font support */
#ifdef HAVE_LIBTT
/* These are enabled by default when configuring Freetype 1.x
I haven't a clue how to reliably detect it at compile time.
We need a compilation probe in Makefile.PL
*/
#define FTXPOST 1
#define FTXERR18 1
#include <freetype.h>
#define TT_CHC 5
#ifdef FTXPOST
#include <ftxpost.h>
#endif
#ifdef FTXERR18
#include <ftxerr18.h>
#endif
/* some versions of FT1.x don't seem to define this - it's font defined
so it won't change */
#ifndef TT_MS_LANGID_ENGLISH_GENERAL
#define TT_MS_LANGID_ENGLISH_GENERAL 0x0409
#endif
/* convert a code point into an index in the glyph cache */
#define TT_HASH(x) ((x) & 0xFF)
typedef struct i_glyph_entry_ {
TT_Glyph glyph;
unsigned long ch;
} i_tt_glyph_entry;
#define TT_NOCHAR (~0UL)
struct TT_Instancehandle_ {
TT_Instance instance;
TT_Instance_Metrics imetrics;
TT_Glyph_Metrics gmetrics[256];
i_tt_glyph_entry glyphs[256];
int smooth;
int ptsize;
int order;
};
typedef struct TT_Instancehandle_ TT_Instancehandle;
struct TT_Fonthandle_ {
TT_Face face;
TT_Face_Properties properties;
TT_Instancehandle instanceh[TT_CHC];
TT_CharMap char_map;
#ifdef FTXPOST
int loaded_names;
TT_Error load_cond;
#endif
};
/* Defines */
#define USTRCT(x) ((x).z)
#define TT_VALID( handle ) ( ( handle ).z != NULL )
static void i_tt_push_error(TT_Error rc);
/* Prototypes */
static int i_tt_get_instance( TT_Fonthandle *handle, int points, int smooth );
static void i_tt_init_raster_map( TT_Raster_Map* bit, int width, int height, int smooth );
static void i_tt_done_raster_map( TT_Raster_Map *bit );
static void i_tt_clear_raster_map( TT_Raster_Map* bit );
static void i_tt_blit_or( TT_Raster_Map *dst, TT_Raster_Map *src,int x_off, int y_off );
static int i_tt_get_glyph( TT_Fonthandle *handle, int inst, unsigned long j );
static void
i_tt_render_glyph( TT_Glyph glyph, TT_Glyph_Metrics* gmetrics,
TT_Raster_Map *bit, TT_Raster_Map *small_bit,
int x_off, int y_off, int smooth );
static int
i_tt_render_all_glyphs( TT_Fonthandle *handle, int inst, TT_Raster_Map *bit,
TT_Raster_Map *small_bit, int cords[6],
char const* txt, int len, int smooth, int utf8 );
static void i_tt_dump_raster_map2( i_img* im, TT_Raster_Map* bit, int xb, int yb, const i_color *cl, int smooth );
static void i_tt_dump_raster_map_channel( i_img* im, TT_Raster_Map* bit, int xb, int yb, int channel, int smooth );
static int
i_tt_rasterize( TT_Fonthandle *handle, TT_Raster_Map *bit, int cords[6],
float points, char const* txt, int len, int smooth, int utf8 );
static undef_int i_tt_bbox_inst( TT_Fonthandle *handle, int inst ,const char *txt, int len, int cords[6], int utf8 );
/* static globals needed */
static int TT_initialized = 0;
static TT_Engine engine;
static int LTT_dpi = 72; /* FIXME: this ought to be a part of the call interface */
static int LTT_hinted = 1; /* FIXME: this too */
/*
* FreeType interface
*/
/*
=item init_tt()
Initializes the freetype font rendering engine
=cut
*/
undef_int
i_init_tt(void) {
TT_Error error;
TT_Byte palette[] = { 0, 64, 127, 191, 255 };
i_clear_error();
mm_log((1,"init_tt()\n"));
error = TT_Init_FreeType( &engine );
if ( error ){
mm_log((1,"Initialization of freetype failed, code = 0x%x\n",error));
i_tt_push_error(error);
i_push_error(0, "Could not initialize freetype 1.x");
return(1);
}
#ifdef FTXPOST
error = TT_Init_Post_Extension( engine );
if (error) {
mm_log((1, "Initialization of Post extension failed = 0x%x\n", error));
i_tt_push_error(error);
i_push_error(0, "Could not initialize FT 1.x POST extension");
return 1;
}
#endif
error = TT_Set_Raster_Gray_Palette(engine, palette);
if (error) {
mm_log((1, "Initialization of gray levels failed = 0x%x\n", error));
i_tt_push_error(error);
i_push_error(0, "Could not initialize FT 1.x POST extension");
return 1;
}
TT_initialized = 1;
return(0);
}
/*
=item i_tt_get_instance(handle, points, smooth)
Finds a points+smooth instance or if one doesn't exist in the cache
allocates room and returns its cache entry
fontname - path to the font to load
handle - handle to the font.
points - points of the requested font
smooth - boolean (True: antialias on, False: antialias is off)
=cut
*/
static
int
i_tt_get_instance( TT_Fonthandle *handle, int points, int smooth ) {
int i,idx;
TT_Error error;
mm_log((1,"i_tt_get_instance(handle 0x%X, points %d, smooth %d)\n",
handle,points,smooth));
if (smooth == -1) { /* Smooth doesn't matter for this search */
for(i=0;i<TT_CHC;i++) {
if (handle->instanceh[i].ptsize==points) {
mm_log((1,"i_tt_get_instance: in cache - (non selective smoothing search) returning %d\n",i));
return i;
}
}
smooth=1; /* We will be adding a font - add it as smooth then */
} else { /* Smooth doesn't matter for this search */
for(i=0;i<TT_CHC;i++) {
if (handle->instanceh[i].ptsize == points
&& handle->instanceh[i].smooth == smooth) {
mm_log((1,"i_tt_get_instance: in cache returning %d\n",i));
return i;
}
}
}
/* Found the instance in the cache - return the cache index */
for(idx=0;idx<TT_CHC;idx++) {
if (!(handle->instanceh[idx].order)) break; /* find the lru item */
}
mm_log((1,"i_tt_get_instance: lru item is %d\n",idx));
mm_log((1,"i_tt_get_instance: lru pointer 0x%X\n",
USTRCT(handle->instanceh[idx].instance) ));
if ( USTRCT(handle->instanceh[idx].instance) ) {
mm_log((1,"i_tt_get_instance: freeing lru item from cache %d\n",idx));
/* Free cached glyphs */
for(i=0;i<256;i++)
if ( USTRCT(handle->instanceh[idx].glyphs[i].glyph) )
TT_Done_Glyph( handle->instanceh[idx].glyphs[i].glyph );
for(i=0;i<256;i++) {
handle->instanceh[idx].glyphs[i].ch = TT_NOCHAR;
USTRCT(handle->instanceh[idx].glyphs[i].glyph)=NULL;
}
/* Free instance if needed */
TT_Done_Instance( handle->instanceh[idx].instance );
}
/* create and initialize instance */
/* FIXME: probably a memory leak on fail */
(void) (( error = TT_New_Instance( handle->face, &handle->instanceh[idx].instance ) ) ||
( error = TT_Set_Instance_Resolutions( handle->instanceh[idx].instance, LTT_dpi, LTT_dpi ) ) ||
( error = TT_Set_Instance_CharSize( handle->instanceh[idx].instance, points*64 ) ) );
if ( error ) {
mm_log((1, "Could not create and initialize instance: error 0x%x.\n",error ));
return -1;
}
/* Now that the instance should the inplace we need to lower all of the
ru counts and put `this' one with the highest entry */
for(i=0;i<TT_CHC;i++) handle->instanceh[i].order--;
handle->instanceh[idx].order=TT_CHC-1;