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[ot/hangul] Don't decompose Hangul even when combining marks present 

As discussed on
https://github.com/behdad/harfbuzz/pull/10#issuecomment-31442030
This commit is contained in:
Behdad Esfahbod 2014-01-02 17:04:04 +08:00
parent 64426ec73a
commit 8fc1f7fe74
3 changed files with 15 additions and 12 deletions
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2
src/hb-ot-shape-complex-hangul.cc
View File

@ -218,7 +218,7 @@ const hb_ot_complex_shaper_t _hb_ot_complex_shaper_hangul =
NULL, /* data_create */
NULL, /* data_destroy */
preprocess_text_hangul,
HB_OT_SHAPE_NORMALIZATION_MODE_DEFAULT,
HB_OT_SHAPE_NORMALIZATION_MODE_NONE,
NULL, /* decompose */
NULL, /* compose */
NULL, /* setup_masks */

1
src/hb-ot-shape-normalize-private.hh
View File

@ -36,6 +36,7 @@
struct hb_ot_shape_plan_t;
enum hb_ot_shape_normalization_mode_t {
HB_OT_SHAPE_NORMALIZATION_MODE_NONE,
HB_OT_SHAPE_NORMALIZATION_MODE_DECOMPOSED,
HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS, /* never composes base-to-base */
HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT, /* always fully decomposes and then recompose back */

24
src/hb-ot-shape-normalize.cc
View File

@ -213,8 +213,9 @@ decompose_current_character (const hb_ot_shape_normalize_context_t *c, bool shor
}
static inline void
handle_variation_selector_cluster (const hb_ot_shape_normalize_context_t *c, unsigned int end)
handle_variation_selector_cluster (const hb_ot_shape_normalize_context_t *c, unsigned int end, bool short_circuit)
{
/* TODO Currently if there's a variation-selector we give-up, it's just too hard. */
hb_buffer_t * const buffer = c->buffer;
hb_font_t * const font = c->font;
for (; buffer->idx < end - 1;) {
@ -250,27 +251,26 @@ handle_variation_selector_cluster (const hb_ot_shape_normalize_context_t *c, uns
}
static inline void
decompose_multi_char_cluster (const hb_ot_shape_normalize_context_t *c, unsigned int end)
decompose_multi_char_cluster (const hb_ot_shape_normalize_context_t *c, unsigned int end, bool short_circuit)
{
hb_buffer_t * const buffer = c->buffer;
/* TODO Currently if there's a variation-selector we give-up, it's just too hard. */
for (unsigned int i = buffer->idx; i < end; i++)
if (unlikely (buffer->unicode->is_variation_selector (buffer->info[i].codepoint))) {
handle_variation_selector_cluster (c, end);
handle_variation_selector_cluster (c, end, short_circuit);
return;
}
while (buffer->idx < end)
decompose_current_character (c, false);
decompose_current_character (c, short_circuit);
}
static inline void
decompose_cluster (const hb_ot_shape_normalize_context_t *c, bool short_circuit, unsigned int end)
decompose_cluster (const hb_ot_shape_normalize_context_t *c, unsigned int end, bool might_short_circuit, bool always_short_circuit)
{
if (likely (c->buffer->idx + 1 == end))
decompose_current_character (c, short_circuit);
decompose_current_character (c, might_short_circuit);
else
decompose_multi_char_cluster (c, end);
decompose_multi_char_cluster (c, end, always_short_circuit);
}
@ -299,8 +299,10 @@ _hb_ot_shape_normalize (const hb_ot_shape_plan_t *plan,
plan->shaper->compose ? plan->shaper->compose : compose_unicode
};
bool short_circuit = mode != HB_OT_SHAPE_NORMALIZATION_MODE_DECOMPOSED &&
mode != HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT;
bool always_short_circuit = mode == HB_OT_SHAPE_NORMALIZATION_MODE_NONE;
bool might_short_circuit = always_short_circuit ||
(mode != HB_OT_SHAPE_NORMALIZATION_MODE_DECOMPOSED &&
mode != HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT);
unsigned int count;
/* We do a fairly straightforward yet custom normalization process in three
@ -321,7 +323,7 @@ _hb_ot_shape_normalize (const hb_ot_shape_plan_t *plan,
if (buffer->cur().cluster != buffer->info[end].cluster)
break;
decompose_cluster (&c, short_circuit, end);
decompose_cluster (&c, end, might_short_circuit, always_short_circuit);
}
buffer->swap_buffers ();