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[OT] Fallback-position ccc=0 Thai / Lao marks 

Not perfect, but so is fallback positioning in 2012...
This commit is contained in:
Behdad Esfahbod 2012-09-01 20:06:26 -04:00
parent 3992b5ec4c
commit 1d581ec384
1 changed files with 46 additions and 10 deletions
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56
src/hb-ot-shape-fallback.cc
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@ -28,14 +28,53 @@
static unsigned int
recategorize_combining_class (hb_codepoint_t u,
unsigned int modified_combining_class)
unsigned int klass)
{
if (modified_combining_class >= 200)
return modified_combining_class;
if (klass >= 200)
return klass;
/* This should be kept in sync with modified combining class mapping
* from hb-unicode.cc. */
switch (modified_combining_class)
/* Thai / Lao need some per-character work. */
if ((u & ~0xFF) == 0x0E00)
{
if (unlikely (klass == 0))
{
switch (u)
{
case 0x0E31:
case 0x0E34:
case 0x0E35:
case 0x0E36:
case 0x0E37:
case 0x0E47:
case 0x0E4C:
case 0x0E4D:
case 0x0E4E:
klass = HB_UNICODE_COMBINING_CLASS_ABOVE_RIGHT;
break;
case 0x0EB1:
case 0x0EB4:
case 0x0EB5:
case 0x0EB6:
case 0x0EB7:
case 0x0EBB:
case 0x0ECC:
case 0x0ECD:
klass = HB_UNICODE_COMBINING_CLASS_ABOVE;
break;
case 0x0EBC:
klass = HB_UNICODE_COMBINING_CLASS_BELOW;
break;
}
} else {
/* Thai virama is below-right */
if (u == 0x0E3A)
klass = HB_UNICODE_COMBINING_CLASS_BELOW_RIGHT;
}
}
switch (klass)
{
/* Hebrew */
@ -89,9 +128,6 @@ recategorize_combining_class (hb_codepoint_t u,
/* Thai */
/* Note: to be useful we also need to position U+0E3A that has ccc=9 (virama).
* But viramas can be both above and below based on the codepoint / script. */
case HB_MODIFIED_COMBINING_CLASS_CCC103: /* sara u / sara uu */
return HB_UNICODE_COMBINING_CLASS_BELOW_RIGHT;
@ -121,7 +157,7 @@ recategorize_combining_class (hb_codepoint_t u,
}
return modified_combining_class;
return klass;
}
void