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Use union for Coverage

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This commit is contained in:
Behdad Esfahbod 2006-12-27 20:05:16 -05:00
parent 86f450243d
commit c46196d09c
1 changed files with 11 additions and 10 deletions
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21
src/harfbuzz-ng.cc
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@ -25,8 +25,6 @@ typedef uint32_t hb_tag_t;
*/
#define DEFINE_INT_TYPE1(NAME, TYPE, BIG_ENDIAN) \
inline NAME (void) { v = 0; } \
explicit inline NAME (TYPE i) { v = BIG_ENDIAN(i); } \
inline NAME& operator = (TYPE i) { v = BIG_ENDIAN(i); return *this; } \
inline operator TYPE(void) const { return BIG_ENDIAN(v); } \
inline bool operator== (NAME o) const { return v == o.v; } \
@ -463,7 +461,8 @@ struct CoverageFormat1 {
DEFINE_ARRAY_TYPE (GlyphID, glyphArray, glyphCount);
inline int get_coverage (uint16_t glyph_id) const {
GlyphID gid (glyph_id);
GlyphID gid;
gid = glyph_id;
// TODO: bsearch
for (int i = 0; i < glyphCount; i++)
if (gid == glyphArray[i])
@ -511,27 +510,29 @@ struct CoverageFormat2 {
* long */
};
struct Coverage {
union Coverage {
DEFINE_NON_INSTANTIABLE(Coverage);
inline unsigned int get_size (void) const {
switch (coverageFormat) {
case 1: return ((const CoverageFormat1&)*this).get_size ();
case 2: return ((const CoverageFormat2&)*this).get_size ();
default:return sizeof (Coverage);
case 1: return format1.get_size ();
case 2: return format2.get_size ();
default:return sizeof (coverageFormat);
}
}
/* Returns -1 if not covered. */
inline int get_coverage (uint16_t glyph_id) const {
switch (coverageFormat) {
case 1: return ((const CoverageFormat1&)*this).get_coverage(glyph_id);
case 2: return ((const CoverageFormat2&)*this).get_coverage(glyph_id);
case 1: return format1.get_coverage(glyph_id);
case 2: return format2.get_coverage(glyph_id);
default:return -1;
}
}
USHORT coverageFormat; /* Format identifier */
USHORT coverageFormat; /* Format identifier */
CoverageFormat1 format1;
CoverageFormat2 format2;
};
/*