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Implement parse_bcd

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This commit is contained in:
Michiharu Ariza 2018-09-11 10:43:15 -07:00
parent 45e564a519
commit bb38d0f663
2 changed files with 44 additions and 15 deletions
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15
src/hb-cff-interp-common.hh
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@ -371,21 +371,6 @@ struct SubByteStr
unsigned int offset; /* beginning of the sub-string within str */
};
inline float parse_bcd (SubByteStr& substr, float& v)
{
// XXX: TODO
v = 0;
for (;;) {
if (!substr.avail ())
return false;
unsigned char byte = substr[0];
substr.inc ();
if (((byte & 0xF0) == 0xF0) || ((byte & 0x0F) == 0x0F))
break;
}
return true;
}
/* stack */
template <typename ELEM, int LIMIT>
struct Stack

44
src/hb-cff-interp-dict-common.hh
View File

@ -26,6 +26,7 @@
#ifndef HB_CFF_INTERP_DICT_COMMON_HH
#define HB_CFF_INTERP_DICT_COMMON_HH
#include "hb-common.h"
#include "hb-cff-interp-common.hh"
namespace CFF {
@ -150,6 +151,49 @@ struct DictOpSet : OpSet<Number>
return true;
}
static inline bool parse_bcd (SubByteStr& substr, float& v)
{
v = 0.0f;
hb_vector_t<char, 64> str;
str.init ();
str.push ('x'); /* hack: disguise a varation option string */
str.push ('=');
unsigned char byte = 0;
for (unsigned int i = 0; substr.avail (); i++)
{
char c;
if ((i & 1) == 0)
{
byte = substr[0];
substr.inc ();
c = (byte & 0xF0) >> 4;
}
else
c = byte & 0x0F;
if (c == 0x0F)
{
hb_variation_t var;
if (unlikely (!hb_variation_from_string (&str[0], str.len, &var)))
{
str.fini ();
return false;
}
v = var.value;
str.fini ();
return true;
}
else if (c == 0x0D) return false;
str.push ("0123456789.EE - "[c]);
if (c == 0x0C)
str.push ('-');
}
str.fini ();
return false;
}
static inline bool is_hint_op (OpCode op)
{
switch (op)