Simplify hb_buffer_set_flags()

From a 2014 HarfBuzz commit:

commit 763e5466c0a03a7c27020e1e2598e488612529a7
Author: Behdad Esfahbod <behdad@behdad.org>
Date:   Sat Aug 2 16:17:44 2014 -0400

    Make it easier to use HB_BUFFER_FLAG_BOT/EOT

    Previously, we expected users to provide BOT/EOT flags when the
    text *segment* was at paragraph boundaries.  This meant that for
    clients that provide full paragraph to HarfBuzz (eg. Pango), they
    had code like this:

      hb_buffer_set_flags (hb_buffer,
                           (item_offset == 0 ? HB_BUFFER_FLAG_BOT : 0) |
                           (item_offset + item_length == paragraph_length ?
                            HB_BUFFER_FLAG_EOT : 0));

      hb_buffer_add_utf8 (hb_buffer,
                          paragraph_text, paragraph_length,
                          item_offset, item_length);

    After this change such clients can simply say:

      hb_buffer_set_flags (hb_buffer,
                           HB_BUFFER_FLAG_BOT | HB_BUFFER_FLAG_EOT);

      hb_buffer_add_utf8 (hb_buffer,
                          paragraph_text, paragraph_length,
                          item_offset, item_length);

    Ie, HarfBuzz itself checks whether the segment is at the beginning/end
    of the paragraph.  Clients that only pass item-at-a-time to HarfBuzz
    continue not setting any flags whatsoever.

    Another way to put it is: if there's pre-context text in the buffer,
    HarfBuzz ignores the BOT flag.  If there's post-context, it ignores
    EOT flag.

0 files changed, 0 insertions, 0 deletions