[vte/wip/egmont/bidi: 50/75] fix character directionalities
- From: Egmont Koblinger <egmontkob src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [vte/wip/egmont/bidi: 50/75] fix character directionalities
- Date: Wed, 19 Sep 2018 08:17:26 +0000 (UTC)
commit be8b0ca770d4e16e46e606da5ab2e0e70469820c
Author: Egmont Koblinger <egmont gmail com>
Date: Mon Aug 27 02:59:13 2018 +0200
fix character directionalities
src/bidi.cc | 107 +++++++++++++++++++++++++++++++++---------------------------
1 file changed, 59 insertions(+), 48 deletions(-)
---
diff --git a/src/bidi.cc b/src/bidi.cc
index 201f576d..58afff6a 100644
--- a/src/bidi.cc
+++ b/src/bidi.cc
@@ -263,10 +263,10 @@ long RingView::paragraph(long row)
int lines[VTE_BIDI_PARAGRAPH_LENGTH_MAX + 1];
lines[0] = 0;
int line = 0;
- int c = 0;
+ int count = 0;
int row_orig = row;
- int j = 0;
- int k, l, v;
+ int tl, tv; /* terminal logical and visual */
+ int fl, fv; /* fribidi logical and visual */
unsigned int col;
/* The buffer size assumes that combining chars are omitted. It's an overkill, but convenient
solution. */
@@ -287,18 +287,18 @@ long RingView::paragraph(long row)
/* A row_data might be longer, in case rewrapping is disabled and the window was narrowed.
* Truncate the logical data before applying BiDi. */
// FIXME what the heck to do if this truncation cuts a TAB or CJK in half???
- for (j = 0; j < m_width && j < row_data->len; j++) {
- cell = _vte_row_data_get (row_data, j);
+ for (tl = 0; tl < m_width && tl < row_data->len; tl++) {
+ cell = _vte_row_data_get (row_data, tl);
if (cell->attr.fragment())
continue;
// FIXME is it okay to run the BiDi algorithm without the combining accents?
// If we need to preserve them then we need to double check whether
// fribidi_reorder_line() requires a FRIBIDI_FLAG_REORDER_NSM or not.
- fribidi_chars[c++] = _vte_unistr_get_base(cell->c);
+ fribidi_chars[count++] = _vte_unistr_get_base(cell->c);
}
- lines[++line] = c;
+ lines[++line] = count;
row++;
if (!row_data->attr.soft_wrapped)
@@ -312,17 +312,17 @@ long RingView::paragraph(long row)
/* Run the BiDi algorithm on the paragraph to get the embedding levels. */
// FIXME this is valid in C++, not just a gcc extension, correct? Or should we call g_newa()?
- FriBidiCharType fribidi_chartypes[c];
- FriBidiBracketType fribidi_brackettypes[c];
- FriBidiLevel fribidi_levels[c];
- FriBidiStrIndex fribidi_map[c];
+ FriBidiCharType fribidi_chartypes[count];
+ FriBidiBracketType fribidi_brackettypes[count];
+ FriBidiLevel fribidi_levels[count];
+ FriBidiStrIndex fribidi_map[count];
pbase_dir = autodir ? (rtl ? FRIBIDI_PAR_WRTL : FRIBIDI_PAR_WLTR)
: (rtl ? FRIBIDI_PAR_RTL : FRIBIDI_PAR_LTR );
- fribidi_get_bidi_types (fribidi_chars, c, fribidi_chartypes);
- fribidi_get_bracket_types (fribidi_chars, c, fribidi_chartypes, fribidi_brackettypes);
- level = fribidi_get_par_embedding_levels_ex (fribidi_chartypes, fribidi_brackettypes, c, &pbase_dir,
fribidi_levels);
+ fribidi_get_bidi_types (fribidi_chars, count, fribidi_chartypes);
+ fribidi_get_bracket_types (fribidi_chars, count, fribidi_chartypes, fribidi_brackettypes);
+ level = fribidi_get_par_embedding_levels_ex (fribidi_chartypes, fribidi_brackettypes, count,
&pbase_dir, fribidi_levels);
if (level == 0) {
/* error */
@@ -338,6 +338,14 @@ long RingView::paragraph(long row)
return explicit_paragraph (row_orig, rtl);
}
+ /* Silly FriBidi API of fribidi_reorder_line()... It reorders whatever values we give to it,
+ * and it would be super convenient for us to pass the logical columns of the terminal.
+ * However, we can't figure out the embedding levels then. So this feature is quite useless.
+ * Set up the trivial mapping for fribidi, and to the mapping manually in fribidi_to_terminal below.
*/
+ for (fl = 0; fl < count; fl++) {
+ fribidi_map[fl] = fl;
+ }
+
/* Reshuffle line by line. */
row = row_orig;
line = 0;
@@ -353,18 +361,20 @@ long RingView::paragraph(long row)
if (row_data == nullptr)
break;
- /* fribidi_reorder_line() conveniently reorders arbitrary numbers we pass as the map.
- * Use the logical position to save us from headaches when encountering fragments. */
- k = lines[line];
- for (j = 0; j < m_width && j < row_data->len; j++) {
- cell = _vte_row_data_get (row_data, j);
+ /* Map from FriBidi's to terminal's logical position, see the detailed explanation above. */
+ // FIXME this is valid in C++, not just a gcc extension, correct? Or should we call g_newa()?
+ FriBidiStrIndex fribidi_to_terminal[lines[line + 1] - lines[line]];
+ fl = 0;
+ for (tl = 0; tl < m_width && tl < row_data->len; tl++) {
+ cell = _vte_row_data_get (row_data, tl);
if (cell->attr.fragment())
continue;
- fribidi_map[k++] = j;
+ fribidi_to_terminal[fl] = tl;
+ fl++;
}
- g_assert_cmpint (k, ==, lines[line + 1]);
+ g_assert_cmpint (fl, ==, lines[line + 1] - lines[line]);
// FIXME is it okay to run the BiDi algorithm without the combining accents?
// If we need to preserve them then we need to have a bigger fribidi_chars array,
@@ -391,64 +401,65 @@ long RingView::paragraph(long row)
}
/* Copy to our realm. Proceed in visual order.*/
- v = 0;
+ tv = 0;
if (rtl) {
/* Unused cells on the left for RTL paragraphs */
int unused = MAX(m_width - row_data->len, 0);
- for (; v < unused; v++) {
- map[v].vis2log = m_width - 1 - v;
- map[v].vis_rtl = TRUE;
+ for (; tv < unused; tv++) {
+ map[tv].vis2log = m_width - 1 - tv;
+ map[tv].vis_rtl = TRUE;
}
}
- for (j = lines[line]; j < lines[line + 1]; j++) {
+ for (fv = lines[line]; fv < lines[line + 1]; fv++) {
/* Inflate fribidi's result by inserting fragments. */
- l = fribidi_map[j];
- cell = _vte_row_data_get (row_data, l);
+ fl = fribidi_map[fv];
+ tl = fribidi_to_terminal[fl - lines[line]];
+ cell = _vte_row_data_get (row_data, tl);
g_assert (!cell->attr.fragment());
g_assert (cell->attr.columns() > 0);
- if (fribidi_levels[l] % 2 == 0) {
+ if (fribidi_levels[fl] % 2 == 0) {
/* LTR character directionality. */
for (col = 0; col < cell->attr.columns(); col++) {
- map[v].vis2log = l;
- map[v].vis_rtl = FALSE;
- v++;
- l++;
+ map[tv].vis2log = tl;
+ map[tv].vis_rtl = FALSE;
+ tv++;
+ tl++;
}
} else {
/* RTL character directionality. Map fragments in reverse order. */
for (col = 0; col < cell->attr.columns(); col++) {
- map[v + col].vis2log = l + cell->attr.columns() - 1 - col;
- map[v + col].vis_rtl = TRUE;
+ map[tv + col].vis2log = tl + cell->attr.columns() - 1 - col;
+ map[tv + col].vis_rtl = TRUE;
}
- v += cell->attr.columns();
- l += cell->attr.columns();
+ tv += cell->attr.columns();
+ tl += cell->attr.columns();
}
}
if (!rtl) {
/* Unused cells on the right for LTR paragraphs */
- g_assert_cmpint (v, ==, MIN (row_data->len, m_width));
- for (; v < m_width; v++) {
- map[v].vis2log = v;
- map[v].vis_rtl = FALSE;
+ g_assert_cmpint (tv, ==, MIN (row_data->len, m_width));
+ for (; tv < m_width; tv++) {
+ map[tv].vis2log = tv;
+ map[tv].vis_rtl = FALSE;
}
}
- g_assert_cmpint (v, ==, m_width);
+ g_assert_cmpint (tv, ==, m_width);
/* From vis2log create the log2vis mapping too.
* In debug mode assert that we have a bijective mapping. */
if (_vte_debug_on (VTE_DEBUG_BIDI)) {
- for (l = 0; l < m_width; l++) {
- map[l].log2vis = -1;
+ for (tl = 0; tl < m_width; tl++) {
+ map[tl].log2vis = -1;
}
}
- for (v = 0; v < m_width; v++) {
- map[map[v].vis2log].log2vis = v;
+ for (tv = 0; tv < m_width; tv++) {
+ map[map[tv].vis2log].log2vis = tv;
}
if (_vte_debug_on (VTE_DEBUG_BIDI)) {
- for (l = 0; l < m_width; l++) {
- g_assert_cmpint (map[l].log2vis, !=, -1);
+ for (tl = 0; tl < m_width; tl++) {
+ g_assert_cmpint (map[tl].log2vis, !=, -1);
}
}
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