if (unlikely (!count)) return_trace (false);
- if (c->random)
- {
- c->random_state = (0x5DEECE66Dull * c->random_state + 11) & (((uint64_t) 1 << 48) - 1);
- c->replace_glyph (alternates[(c->random_state >> 32) % count]);
- }
- else
- {
- hb_mask_t glyph_mask = c->buffer->cur().mask;
- hb_mask_t lookup_mask = c->lookup_mask;
+ hb_mask_t glyph_mask = c->buffer->cur().mask;
+ hb_mask_t lookup_mask = c->lookup_mask;
- /* Note: This breaks badly if two features enabled this lookup together. */
- unsigned int shift = hb_ctz (lookup_mask);
- unsigned int alt_index = ((lookup_mask & glyph_mask) >> shift);
+ /* Note: This breaks badly if two features enabled this lookup together. */
+ unsigned int shift = hb_ctz (lookup_mask);
+ unsigned int alt_index = ((lookup_mask & glyph_mask) >> shift);
- if (unlikely (alt_index > count || alt_index == 0)) return_trace (false);
+ if (unlikely (alt_index > count || alt_index == 0)) return_trace (false);
- c->replace_glyph (alternates[alt_index - 1]);
+ /* This is ugly... If alt_index is 1, we take it as "on", and randomize
+ * feature if it is the rand feature. If it's > 1, it's a user-set value
+ * for sure, so respect it. So, user cannot set rand=1 and expect it to
+ * choose the first alternate... */
+ if (alt_index == 1 && c->random)
+ {
+ c->random_state = (0x5DEECE66Dull * c->random_state + 11) & (((uint64_t) 1 << 48) - 1);
+ alt_index = (c->random_state >> 32) % count + 1;
}
+ c->replace_glyph (alternates[alt_index - 1]);
+
return_trace (true);
}