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[Indic] Add runtime Uniscribe bug compatibility mode! 

Enable by setting envvar:

  HB_OT_INDIC_OPTIONS=uniscribe-bug-compatible

Plus, LeftMatra+Halant "feature".
This commit is contained in:
Behdad Esfahbod 2012-05-11 16:43:12 +02:00
parent 616e692e29
commit ebe29733d4
1 changed files with 33 additions and 11 deletions
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44
src/hb-ot-shape-complex-indic.cc
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@ -24,10 +24,19 @@
* Google Author(s): Behdad Esfahbod
*/
#define UNISCRIBE_BUG_COMPATIBLE 1
#include "hb-ot-shape-complex-indic-private.hh"
static const struct indic_options_t
{
indic_options_t (void)
{
char *c = getenv ("HB_OT_INDIC_OPTIONS");
uniscribe_bug_compatible = c && strstr (c, "uniscribe-bug-compatible");
}
bool uniscribe_bug_compatible;
} options;
static int
compare_codepoint (const void *pa, const void *pb)
{
@ -357,10 +366,26 @@ initial_reordering_consonant_syllable (const hb_ot_map_t *map, hb_buffer_t *buff
}
/* Attach ZWJ, ZWNJ, nukta, and halant to previous char to move with them. */
for (unsigned int i = start + 1; i < end; i++)
if ((FLAG (info[i].indic_category()) &
(FLAG (OT_ZWNJ) | FLAG (OT_ZWJ) | FLAG (OT_N) | FLAG (OT_H))))
info[i].indic_position() = info[i - 1].indic_position();
if (!options.uniscribe_bug_compatible)
{
/* Please update the Uniscribe branch when touching this! */
for (unsigned int i = start + 1; i < end; i++)
if ((FLAG (info[i].indic_category()) & (FLAG (OT_ZWNJ) | FLAG (OT_ZWJ) | FLAG (OT_N) | FLAG (OT_H))))
info[i].indic_position() = info[i - 1].indic_position();
} else {
/* Please update the non-Uniscribe branch when touching this! */
for (unsigned int i = start + 1; i < end; i++)
if ((FLAG (info[i].indic_category()) & (FLAG (OT_ZWNJ) | FLAG (OT_ZWJ) | FLAG (OT_N) | FLAG (OT_H)))) {
info[i].indic_position() = info[i - 1].indic_position();
if (info[i].indic_category() == OT_H && info[i].indic_position() == POS_LEFT_MATRA)
for (unsigned int j = i; j > start; j--)
if (info[j - 1].indic_position() != POS_LEFT_MATRA) {
/* Uniscribe doesn't move the Halant with Left Matra. */
info[i].indic_position() = info[j - 1].indic_position();
break;
}
}
}
/* We do bubble-sort, skip malicious clusters attempts */
if (end - start < 64)
@ -666,11 +691,8 @@ final_reordering_syllable (hb_buffer_t *buffer,
/* Finish off the clusters and go home! */
/* For testing purposes we want to enable this to test against Uniscribe.
* One day when we don't compare to Uniscribe output anymore, we want to
* disable this because we believe it would make for superior cursor
* positioning. */
if (UNISCRIBE_BUG_COMPATIBLE) {
if (!options.uniscribe_bug_compatible)
{
/* This is what Uniscribe does. Ie. add cluster boundaries after Halant,ZWNJ.
* This means, half forms are submerged into the main consonants cluster.
* This is unnecessary, and makes cursor positioning harder, but that's what