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[uniscribe] Ask Uniscribe to return shaping results in logical order

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See discussion on the list in the thread "Arabic presentation forms
and the uniscribe backend".

Based on patch from Jonathan Kew.
This commit is contained in:
Behdad Esfahbod 2013-08-21 17:22:21 -04:00
parent 1d05fdd09f
commit 3409fb1c76
1 changed files with 12 additions and 12 deletions
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18
src/hb-uniscribe.cc
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@ -832,9 +832,8 @@ retry:
unsigned int glyphs_offset = 0;
unsigned int glyphs_len;
bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction);
for (unsigned int j = 0; j < item_count; j++)
for (unsigned int i = 0; i < item_count; i++)
{
unsigned int i = backward ? item_count - 1 - j : j;
unsigned int chars_offset = items[i].iCharPos;
unsigned int item_chars_len = items[i + 1].iCharPos - chars_offset;
@ -875,6 +874,10 @@ retry:
}
}
/* Asking for glyphs in logical order circumvents at least
* one bug in Uniscribe. */
items[i].a.fLogicalOrder = true;
retry_shape:
hr = funcs->ScriptShapeOpenType (font_data->hdc,
&font_data->script_cache,
@ -962,15 +965,9 @@ retry:
uint32_t *p = &vis_clusters[log_clusters[buffer->info[i].utf16_index()]];
*p = MIN (*p, buffer->info[i].cluster);
}
if (!backward) {
for (unsigned int i = 1; i < glyphs_len; i++)
if (vis_clusters[i] == -1)
vis_clusters[i] = vis_clusters[i - 1];
} else {
for (int i = glyphs_len - 2; i >= 0; i--)
if (vis_clusters[i] == -1)
vis_clusters[i] = vis_clusters[i + 1];
}
#undef utf16_index
@ -1004,10 +1001,13 @@ retry:
/* TODO vertical */
pos->x_advance = info->mask;
pos->x_offset = info->var1.u32;
pos->x_offset = backward ? -info->var1.u32 : info->var1.u32;
pos->y_offset = info->var2.u32;
}
if (backward)
hb_buffer_reverse (buffer);
/* Wow, done! */
return true;
}