[vte/wip/egmont/bidi: 90/91] ring extra line
- From: Egmont Koblinger <egmontkob src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [vte/wip/egmont/bidi: 90/91] ring extra line
- Date: Tue, 5 Feb 2019 19:23:35 +0000 (UTC)
commit 52d94c0530427a875caa405468ede0ed70842274
Author: Egmont Koblinger <egmont gmail com>
Date: Thu Jan 24 23:22:58 2019 +0100
ring extra line
src/ring.cc | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
---
diff --git a/src/ring.cc b/src/ring.cc
index 1f3e90d7..81c7b62e 100644
--- a/src/ring.cc
+++ b/src/ring.cc
@@ -737,7 +737,10 @@ Ring::discard_one_row()
void
Ring::maybe_freeze_one_row()
{
- if (G_LIKELY(m_mask >= m_visible_rows &&
+ /* Keep at least m_visible_rows + 1 rows in the ring.
+ * The BiDi spec requires that the just scrolled out row
+ * is still alterable (can be switched to hard line ending). */
+ if (G_LIKELY(m_mask >= m_visible_rows + 1 &&
m_writable + m_mask + 1 == m_end))
freeze_one_row();
else
@@ -758,7 +761,8 @@ Ring::ensure_writable_room()
row_t new_mask, old_mask, i, end;
VteRowData* old_array, *new_array;;
- if (G_LIKELY(m_mask >= m_visible_rows &&
+ /* See the comment about m_visible_rows + 1 above at maybe_freeze_one_row(). */
+ if (G_LIKELY(m_mask >= m_visible_rows + 1 &&
m_writable + m_mask + 1 > m_end))
return;
@@ -767,7 +771,7 @@ Ring::ensure_writable_room()
do {
m_mask = (m_mask << 1) + 1;
- } while (m_mask < m_visible_rows || m_writable + m_mask + 1 <= m_end);
+ } while (m_mask < m_visible_rows + 1 || m_writable + m_mask + 1 <= m_end);
_vte_debug_print(VTE_DEBUG_RING, "Enlarging writable array from %lu to %lu\n", old_mask, m_mask);
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