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[hb-cairo] Fix hb_cairo_glyphs_from_buffer() when utf8 missing 

Fixes https://github.com/harfbuzz/harfbuzz/issues/4016
This commit is contained in:
Behdad Esfahbod 2023-01-08 11:55:13 -07:00
parent 10390ec5c6
commit 5d94eb61b8
1 changed files with 4 additions and 2 deletions
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6
src/hb-cairo.cc
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@ -831,7 +831,7 @@ hb_cairo_glyphs_from_buffer (hb_buffer_t *buffer,
if (orig_num_glyphs < *num_glyphs + 1)
*glyphs = cairo_glyph_allocate (*num_glyphs + 1);
if (clusters)
if (clusters && utf8)
{
unsigned orig_num_clusters = *num_clusters;
*num_clusters = *num_glyphs ? 1 : 0;
@ -860,7 +860,7 @@ hb_cairo_glyphs_from_buffer (hb_buffer_t *buffer,
(*glyphs)[i].x = round (hx * x_scale);
(*glyphs)[i].y = round (hy * y_scale);
if (clusters && *num_clusters)
if (clusters && *num_clusters && utf8)
{
memset ((void *) *clusters, 0, *num_clusters * sizeof ((*clusters)[0]));
hb_bool_t backward = HB_DIRECTION_IS_BACKWARD (hb_buffer_get_direction (buffer));
@ -909,6 +909,8 @@ hb_cairo_glyphs_from_buffer (hb_buffer_t *buffer,
(*clusters)[cluster].num_bytes = utf8 + utf8_len - start;
}
}
else if (num_clusters)
*num_clusters = 0;
}
#endif