Add OpenTypeFontFile.

This commit is contained in:
Behdad Esfahbod 2006-12-25 05:39:20 -05:00
parent 8596944b74
commit b739c05ca4
2 changed files with 107 additions and 8 deletions

View File

@ -1,3 +1,3 @@
all: hb-types-private all: hb-types-private
CXXFLAGS = -Wall -Wextra `pkg-config --cflags glib-2.0` CXXFLAGS = -Wall -Wextra `pkg-config --cflags --libs glib-2.0`

View File

@ -2,7 +2,13 @@
#include <assert.h> #include <assert.h>
#include <glib.h> #include <glib.h>
/* Public header */
typedef uint32_t hb_tag_t;
#define HB_TAG(a,b,c,d) ((hb_tag_t)(((uint8_t)a<<24)|((uint8_t)b<<16)|((uint8_t)c<<8)|(uint8_t)d))
/* Implementation */
/* Macros to convert to/from BigEndian */ /* Macros to convert to/from BigEndian */
#define hb_be_uint8_t #define hb_be_uint8_t
@ -146,7 +152,7 @@ struct F2DOT14 : SHORT {
* system, feature, or baseline */ * system, feature, or baseline */
struct Tag { struct Tag {
inline Tag (void) { v[0] = v[1] = v[2] = v[3] = 0; } inline Tag (void) { v[0] = v[1] = v[2] = v[3] = 0; }
inline Tag (char *c) { v[0] = c[0]; v[1] = c[1]; v[2] = c[2]; v[3] = c[3]; } inline Tag (const char *c) { v[0] = c[0]; v[1] = c[1]; v[2] = c[2]; v[3] = c[3]; }
inline operator uint32_t(void) const { return (v[0]<<24)+(v[1]<<16) +(v[2]<<8)+v[3]; } \ inline operator uint32_t(void) const { return (v[0]<<24)+(v[1]<<16) +(v[2]<<8)+v[3]; } \
private: char v[4]; private: char v[4];
}; };
@ -189,6 +195,10 @@ struct Fixed_Version : Fixed {
* Organization of an OpenType Font * Organization of an OpenType Font
*/ */
struct OpenTypeFontFile;
struct OffsetTable;
struct TTCHeader;
struct TableDirectory { struct TableDirectory {
Tag tag; /* 4-byte identifier. */ Tag tag; /* 4-byte identifier. */
CheckSum checkSum; /* CheckSum for this table. */ CheckSum checkSum; /* CheckSum for this table. */
@ -206,7 +216,6 @@ struct OffsetTable {
USHORT entrySelector; /* Log2(maximum power of 2 <= numTables). */ USHORT entrySelector; /* Log2(maximum power of 2 <= numTables). */
USHORT rangeShift; /* NumTables x 16-searchRange. */ USHORT rangeShift; /* NumTables x 16-searchRange. */
TableDirectory tableDir[]; /* TableDirectory entries. numTables items */ TableDirectory tableDir[]; /* TableDirectory entries. numTables items */
}; };
@ -229,6 +238,62 @@ struct TTCHeader {
}; };
/*
* OpenType Font File
*/
struct OpenTypeFontFile {
Tag tag; /* 4-byte identifier. */
unsigned int get_len (void) const {
switch (tag) {
default:
return 0;
case HB_TAG (0,1,0,0):
case HB_TAG ('O','T','T','O'):
return 1;
case HB_TAG ('t','t','c','f'):
const TTCHeader &ttc = (TTCHeader&)*this;
return ttc.get_len ();
}
}
inline const OffsetTable& operator[] (unsigned int i) const {
assert (i < get_len ());
switch (tag) {
default:
case HB_TAG (0,1,0,0):
case HB_TAG ('O','T','T','O'):
return (const OffsetTable&)*this;
case HB_TAG ('t','t','c','f'):
const TTCHeader &ttc = (const TTCHeader&)*this;
return ttc[i];
}
}
inline OffsetTable& operator[] (unsigned int i) {
assert (i < get_len ());
switch (tag) {
default:
case HB_TAG (0,1,0,0):
case HB_TAG ('O','T','T','O'):
return (OffsetTable&)*this;
case HB_TAG ('t','t','c','f'):
TTCHeader &ttc = (TTCHeader&)*this;
return ttc[i];
}
}
/* ::get(font_data). This is how you get a handle to one of these */
static inline const OpenTypeFontFile& get (const char *font_data) {
return (const OpenTypeFontFile&)*font_data;
}
static inline OpenTypeFontFile& get (char *font_data) {
return (OpenTypeFontFile&)*font_data;
}
/* cannot be instantiated */
private: OpenTypeFontFile() {}
};
@ -271,18 +336,52 @@ struct Script {
struct LangSys { struct LangSys {
}; };
#include <stdlib.h>
#include <stdio.h> #include <stdio.h>
int int
main (void) main (int argc, char **argv)
{ {
// Tag y("abcd"); if (argc != 2) {
// Tag &x = y; fprintf (stderr, "usage: %s font-file.ttf\n", argv[0]);
// BYTE b(0); exit (1);
}
GMappedFile *mf = g_mapped_file_new (argv[1], FALSE, NULL);
const char *font_data = g_mapped_file_get_contents (mf);
int len = g_mapped_file_get_length (mf);
printf ("Opened font file %s: %d bytes long\n", argv[1], len);
const OpenTypeFontFile &ot = OpenTypeFontFile::get (font_data);
switch (ot.tag) {
case HB_TAG (0,1,0,0):
printf ("OpenType font with TrueType outlines\n");
break;
case HB_TAG ('O','T','T','O'):
printf ("OpenType font with CFF (Type1) outlines\n");
break;
case HB_TAG ('t','t','c','f'):
printf ("TrueType Collection of OpenType fonts\n");
break;
default:
fprintf (stderr, "Unknown font format\n");
exit (1);
break;
}
int num_fonts = ot.get_len ();
printf ("%d font(s) found in file\n", num_fonts);
for (int i = 0; i < num_fonts; i++) {
printf ("Font %d of %d\n", i+1, num_fonts);
const OffsetTable &offset_table = ot[i];
}
printf ("%d\n", sizeof (ScriptList));//, x+0, y+0);
return 0; return 0;
} }