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[uniscribe] Move name generation into separate function

This commit is contained in:
Behdad Esfahbod 2013-07-21 16:22:10 -04:00
parent 73f947e2a7
commit bdeea605fe
1 changed files with 22 additions and 12 deletions
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34
src/hb-uniscribe.cc
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@ -272,20 +272,18 @@ struct hb_uniscribe_shaper_face_data_t {
wchar_t face_name[LF_FACESIZE];
};
/* Destroys blob. */
static hb_blob_t *
_hb_rename_font (hb_blob_t *blob, wchar_t *new_name)
/* face_name should point to a wchar_t[LF_FACESIZE] object. */
static void
_hb_generate_unique_face_name (wchar_t *face_name, unsigned int *plen)
{
unsigned int length, new_length = 0;
const char *orig_sfnt_data = hb_blob_get_data (blob, &length);
/* We'll create a private name for the font from a UUID using a simple,
* somewhat base64-like encoding scheme */
const char *enc = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+-";
UUID id;
UuidCreate ((UUID*) &id);
unsigned int name_str_len = 0;
new_name[name_str_len++] = 'F';
new_name[name_str_len++] = '_';
face_name[name_str_len++] = 'F';
face_name[name_str_len++] = '_';
unsigned char *p = (unsigned char *) &id;
for (unsigned int i = 0; i < 16; i += 2)
{
@ -294,11 +292,23 @@ _hb_rename_font (hb_blob_t *blob, wchar_t *new_name)
* This will generate 24 characters; with the 'F_' prefix we already provided,
* the name will be 26 chars (plus the NUL terminator), so will always fit within
* face_name (LF_FACESIZE = 32). */
new_name[name_str_len++] = enc[p[i] >> 3];
new_name[name_str_len++] = enc[((p[i] << 2) | (p[i + 1] >> 6)) & 0x1f];
new_name[name_str_len++] = enc[p[i + 1] & 0x3f];
face_name[name_str_len++] = enc[p[i] >> 3];
face_name[name_str_len++] = enc[((p[i] << 2) | (p[i + 1] >> 6)) & 0x1f];
face_name[name_str_len++] = enc[p[i + 1] & 0x3f];
}
new_name[name_str_len] = 0;
face_name[name_str_len] = 0;
if (plen)
*plen = name_str_len;
}
/* Destroys blob. */
static hb_blob_t *
_hb_rename_font (hb_blob_t *blob, wchar_t *new_name)
{
unsigned int length, new_length, name_str_len;
const char *orig_sfnt_data = hb_blob_get_data (blob, &length);
_hb_generate_unique_face_name (new_name, &name_str_len);
/* Create a copy of the font data, with the 'name' table replaced by a table
* that names the font with our private F_* name created above.
@ -328,7 +338,7 @@ _hb_rename_font (hb_blob_t *blob, wchar_t *new_name)
unsigned char *name_table_data = (unsigned char *) (new_sfnt_data + name_table_offset);
p = name_table_data;
unsigned char *p = name_table_data;
*p++ = 0x00; *p++ = 0x00; /* format = 0 */
*p++ = 0x00; *p++ = name_count; /* number of name records */
*p++ = 0x00; *p++ = name_header_size + name_count * name_record_size; /* offset to string data */