Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

709 lines (563 sloc) 17.295 kb
#include "imext.h"
#include "imt1.h"
#include <t1lib.h>
#include <string.h>
static int t1_get_flags(char const *flags);
static char *t1_from_utf8(char const *in, size_t 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();
t1_initialized = 0;
}
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));
t1_push_error();
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));
}
if (T1_LoadFont(font_id)) {
mm_log((1, "i_t1_new() -> -1 - T1_LoadFont failed (%d)\n", T1_errno));
t1_push_error();
i_push_error(0, "loading font");
T1_DeleteFont(font_id);
return -1;
}
++t1_active_fonts;
mm_log((1, "i_t1_new() -> %d\n", font_id));
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,i_img_dim xb,i_img_dim yb,int channel,int fontnum,double points,char* str,size_t 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, size_t 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, double points,const char *str,size_t len, i_img_dim cords[6], int utf8,char const *flags) {
BBox bbox;
BBox gbbox;
int mod_flags = t1_get_flags(flags);
i_img_dim 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]=((double)bbox.llx*points)/1000;
cords[BBOX_POS_WIDTH]=((double)bbox.urx*points)/1000;
cords[BBOX_GLOBAL_DESCENT]=((double)gbbox.lly*points)/1000;
cords[BBOX_GLOBAL_ASCENT]=((double)gbbox.ury*points)/1000;
cords[BBOX_DESCENT]=((double)bbox.lly*points)/1000;
cords[BBOX_ASCENT]=((double)bbox.ury*points)/1000;
cords[BBOX_ADVANCE_WIDTH] = ((double)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, i_img_dim xb, i_img_dim yb,const i_color *cl,int fontnum, double points,const char* str,size_t 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; }
r = i_render_new(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_delete(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, size_t 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, size_t len, int *outlen) {
/* at this point len is from a STRLEN which should be size_t and can't
be too big for mymalloc */
char *out = mymalloc(len+1); /* rechecked 29jul11 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, size_t 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) {
#if T1LIB_VERSION > 5 || T1LIB_VERSION == 5 && T1LIB_VERSION >= 1
/* I don't know when T1_StrError() was introduced, be conservative */
i_push_error(T1_errno, T1_StrError(T1_errno));
#else
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, "Attempt to Load Multiple Master Font");
break;
#endif
#ifdef T1ERR_SCAN_FILE_OPEN_ERR
case T1ERR_SCAN_FILE_OPEN_ERR:
i_push_error(T1ERR_SCAN_FILE_OPEN_ERR, "Type 1 Font File Open Error");
break;
#endif
#ifdef T1ERR_SCAN_OUT_OF_MEMORY
case T1ERR_SCAN_OUT_OF_MEMORY:
i_push_error(T1ERR_SCAN_OUT_OF_MEMORY, "Virtual Memory Exceeded");
break;
#endif
#ifdef T1ERR_SCAN_ERROR
case T1ERR_SCAN_ERROR:
i_push_error(T1ERR_SCAN_ERROR, "Syntactical Error Scanning Font File");
break;
#endif
#ifdef T1ERR_SCAN_FILE_EOF
case T1ERR_SCAN_FILE_EOF:
i_push_error(T1ERR_SCAN_FILE_EOF, "Premature End of Font File Encountered");
break;
#endif
#ifdef T1ERR_PATH_ERROR
case T1ERR_PATH_ERROR:
i_push_error(T1ERR_PATH_ERROR, "Path Construction Error");
break;
#endif
#ifdef T1ERR_PARSE_ERROR
case T1ERR_PARSE_ERROR:
i_push_error(T1ERR_PARSE_ERROR, "Font is Corrupt");
break;
#endif
#ifdef T1ERR_TYPE1_ABORT
case T1ERR_TYPE1_ABORT:
i_push_error(T1ERR_TYPE1_ABORT, "Rasterization Aborted");
break;
#endif
#ifdef T1ERR_INVALID_FONTID
case T1ERR_INVALID_FONTID:
i_push_error(T1ERR_INVALID_FONTID, "Font ID Invalid in this Context");
break;
#endif
#ifdef T1ERR_INVALID_PARAMETER
case T1ERR_INVALID_PARAMETER:
i_push_error(T1ERR_INVALID_PARAMETER, "Invalid Argument in Function Call");
break;
#endif
#ifdef T1ERR_OP_NOT_PERMITTED
case T1ERR_OP_NOT_PERMITTED:
i_push_error(T1ERR_OP_NOT_PERMITTED, "Operation not Permitted");
break;
#endif
#ifdef T1ERR_ALLOC_MEM
case T1ERR_ALLOC_MEM:
i_push_error(T1ERR_ALLOC_MEM, "Memory Allocation Error");
break;
#endif
#ifdef T1ERR_FILE_OPEN_ERR
case T1ERR_FILE_OPEN_ERR:
i_push_error(T1ERR_FILE_OPEN_ERR, "Error Opening File");
break;
#endif
#ifdef T1ERR_UNSPECIFIED
case T1ERR_UNSPECIFIED:
i_push_error(T1ERR_UNSPECIFIED, "Unspecified T1Lib Error");
break;
#endif
#ifdef T1ERR_NO_AFM_DATA
case T1ERR_NO_AFM_DATA:
i_push_error(T1ERR_NO_AFM_DATA, "Missing AFM Data");
break;
#endif
#ifdef T1ERR_X11
case T1ERR_X11:
i_push_error(T1ERR_X11, "X11 Interface Error");
break;
#endif
#ifdef T1ERR_COMPOSITE_CHAR
case T1ERR_COMPOSITE_CHAR:
i_push_error(T1ERR_COMPOSITE_CHAR, "Missing Component of Composite Character");
break;
#endif
#ifdef T1ERR_SCAN_ENCODING
case T1ERR_SCAN_ENCODING:
i_push_error(T1ERR_SCAN_ENCODING, "Error Scanning Encoding File");
break;
#endif
default:
i_push_errorf(T1_errno, "unknown error %d", (int)T1_errno);
}
#endif
}
Jump to Line
Something went wrong with that request. Please try again.