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Device tables.

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This commit is contained in:
Behdad Esfahbod 2006-12-26 20:55:37 -05:00
parent eb32e374f4
commit 2b73745197
1 changed files with 45 additions and 4 deletions
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49
src/harfbuzz-ng.cc
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@ -82,7 +82,7 @@ typedef uint32_t hb_tag_t;
#define DEFINE_OFFSET_INDEX_OPERATOR(const, Type, array, num) \
inline const Type& operator[] (unsigned int i) const { \
assert (i < num); \
assert (array[i]); \
assert (array[i]); /* TODO: should just skip them */ \
return *(const Type *)((const char*)this + array[i]); \
}
@ -93,7 +93,7 @@ typedef uint32_t hb_tag_t;
#define DEFINE_RECORD_ACCESSOR(const, Type, array, num) \
inline const Type& operator[] (unsigned int i) const { \
assert (i < num); \
assert (array[i].offset); \
assert (array[i].offset); /* TODO: should just skip them */ \
return *(const Type *)((const char*)this + array[i].offset); \
} \
inline const Tag& get_tag (unsigned int i) const { \
@ -441,7 +441,7 @@ struct Lookup {
};
/*
* Coverage
* Coverage Table
*/
struct CoverageFormat1 {
@ -521,7 +521,7 @@ struct Coverage {
};
/*
* Class Definition
* Class Definition Table
*/
struct ClassDefFormat1 {
@ -597,7 +597,48 @@ struct ClassDef {
USHORT classFormat; /* Format identifier */
};
/*
* Device Tables
*/
struct Device {
inline unsigned int get_size (void) const {
int count = endSize - startSize + 1;
if (count < 0) count = 0;
switch (deltaFormat) {
case 1: return sizeof (Device) + sizeof (USHORT) * ((count+7)/8);
case 2: return sizeof (Device) + sizeof (USHORT) * ((count+3)/4);
case 3: return sizeof (Device) + sizeof (USHORT) * ((count+1)/2);
default:return sizeof (Device);
}
}
inline int get_delta (int ppem_size) {
if (ppem_size >= startSize && ppem_size <= endSize &&
deltaFormat >= 1 && deltaFormat <= 3) {
int s = ppem_size - startSize;
int f = deltaFormat;
uint16_t byte = deltaValue[s >> (4 - f)];
uint16_t bits = byte >> (16 - (((s & ((1 << (4 - f)) - 1)) + 1) << f));
uint16_t mask = 0xFFFF >> (16 - (1 << f));
int delta = bits & mask;
if (delta >= ((mask + 1) >> 1))
delta -= mask + 1;
return delta;
}
return 0;
}
USHORT startSize; /* Smallest size to correct--in ppem */
USHORT endSize; /* Largest size to correct--in ppem */
USHORT deltaFormat; /* Format of DeltaValue array data: 1, 2, or 3 */
USHORT deltaValue[]; /* Array of compressed data */
};