[vte/wip/egmont/bidi: 30/97] bidi is now run on paragraphs (limited to viewport for now)
- From: Egmont Koblinger <egmontkob src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [vte/wip/egmont/bidi: 30/97] bidi is now run on paragraphs (limited to viewport for now)
- Date: Mon, 6 May 2019 18:17:26 +0000 (UTC)
commit 1734dec674df23fa33afe2a66cdbe508b0b3ed73
Author: Egmont Koblinger <egmont gmail com>
Date: Thu Aug 23 00:40:41 2018 +0200
bidi is now run on paragraphs (limited to viewport for now)
src/bidi.cc | 315 ++++++++++++++++++++++++++++++++++++++++++------------
src/bidi.hh | 18 +---
src/vte.cc | 16 ++-
src/vtedefines.hh | 3 +
4 files changed, 269 insertions(+), 83 deletions(-)
---
diff --git a/src/bidi.cc b/src/bidi.cc
index 0207399d..72023d2a 100644
--- a/src/bidi.cc
+++ b/src/bidi.cc
@@ -24,8 +24,21 @@
#include "bidi.hh"
#include "debug.h"
+#include "vtedefines.hh"
#include "vteinternal.hh"
+
+
+#ifdef WITH_FRIBIDI
+FriBidiChar fribidi_chars[100000];
+FriBidiCharType fribidi_chartypes[100000];
+FriBidiBracketType fribidi_brackettypes[100000];
+FriBidiLevel fribidi_levels[100000];
+FriBidiStrIndex fribidi_map[100000];
+#endif
+
+
+
using namespace vte::base;
RingView::RingView()
@@ -47,7 +60,7 @@ RingView::~RingView()
{
for (int i = 0; i < m_height_alloc; i++)
g_free (m_bidimaps[i]);
- g_free (m_bidimaps);
+ g_free (m_bidimaps);
/* ... */
}
@@ -89,109 +102,277 @@ void RingView::set_rows(long s, long l)
void RingView::update()
{
- for (int i = 0; i < m_len; i++) {
- for (int j = 0; j < m_width; j++) {
- m_bidimaps[i][j].log2vis = j;
- m_bidimaps[i][j].vis2log = j;
- m_bidimaps[i][j].rtl = 0;
- }
+ long i = m_start;
+ while (i < m_start + m_len) {
+ i = paragraph (i);
}
}
bidicellmap *RingView::get_row_map(long row)
{
- g_assert (row >= m_start && row < m_start + m_len);
+ g_assert_cmpint (row, >=, m_start);
+ g_assert_cmpint (row, <, m_start + m_len);
return m_bidimaps[row - m_start];
}
-#ifdef WITH_FRIBIDI
-
-FriBidiChar str[1000];
-FriBidiStrIndex L_to_V[1000];
-FriBidiStrIndex V_to_L[1000];
-
-static void bidi_shuffle_explicit (int width, gboolean rtl)
+/* Set up the mapping according to explicit mode for a given line. */
+void RingView::explicit_line(long row, gboolean rtl)
{
int i;
+ bidicellmap *map;
+
+ if (G_UNLIKELY (row < m_start || row >= m_start + m_len))
+ return;
+
+ map = m_bidimaps[row - m_start];
- if (rtl) {
- for (i = 0; i < width; i++) {
- L_to_V[i] = V_to_L[i] = width - 1 - i;
+ if (G_UNLIKELY (rtl)) {
+ for (i = 0; i < m_width; i++) {
+ map[i].log2vis = map[i].vis2log = m_width - 1 - i;
+ map[i].vis_rtl = TRUE;
}
} else {
- for (i = 0; i < width; i++) {
- L_to_V[i] = V_to_L[i] = i;
+ for (i = 0; i < m_width; i++) {
+ map[i].log2vis = map[i].vis2log = i;
+ map[i].vis_rtl = FALSE;
}
}
}
-void bidi_shuffle (const VteRowData *rowdata, int width)
+/* Set up the mapping according to explicit mode, for all the lines
+ * of a paragraph beginning at the given line.
+ * Returns the row number after the paragraph or viewport (whichever ends first). */
+long RingView::explicit_paragraph(long row, gboolean rtl)
{
- int i;
+ const VteRowData *row_data;
+
+ while (row < m_start + m_len) {
+ explicit_line(row, rtl);
+
+ row_data = m_ring->index(row++);
+ if (row_data == nullptr || !row_data->attr.soft_wrapped)
+ break;
+ }
+ return row;
+}
+
+/* Figure out the mapping for the paragraph starting at the given row.
+ * Returns the row number after the paragraph or viewport (whichever ends first). */
+long RingView::paragraph(long row)
+{
+ const VteRowData *row_data;
+
+#ifdef WITH_FRIBIDI
+ const VteCell *cell;
+ gboolean rtl;
+ gboolean autodir;
FriBidiParType pbase_dir;
+ FriBidiLevel level;
+ bidicellmap *map;
+#endif /* WITH_FRIBIDI */
- if (rowdata == NULL) { // FIXME make sure it doesn't happen
- bidi_shuffle_explicit (width, FALSE);
- return;
+ row_data = m_ring->index(row);
+ if (row_data == nullptr) {
+ return explicit_paragraph(row, FALSE);
}
- if (!(rowdata->attr.bidi_flags & VTE_BIDI_IMPLICIT)) {
- bidi_shuffle_explicit (width, rowdata->attr.bidi_flags & VTE_BIDI_RTL);
- return;
+#ifndef WITH_FRIBIDI
+ return explicit_paragraph(row, !!(row_data->attr.bidi_flags & VTE_BIDI_RTL));
+#else
+
+ if (!(row_data->attr.bidi_flags & VTE_BIDI_IMPLICIT)) {
+ return explicit_paragraph(row, !!(row_data->attr.bidi_flags & VTE_BIDI_RTL));
}
- for (i = 0; i < rowdata->len && i < width; i++) {
- if (rowdata->cells[i].c == 0) break;
- // FIXME is it okay to run the BiDi algorithm without the combining accents?
- str[i] = _vte_unistr_get_base(rowdata->cells[i].c);
+ rtl = !!(row_data->attr.bidi_flags & VTE_BIDI_RTL);
+ autodir = !!(row_data->attr.bidi_flags & VTE_BIDI_AUTO);
+
+ int lines[VTE_BIDI_PARAGRAPH_LENGTH_MAX + 1];
+ lines[0] = 0;
+ int line = 0;
+ int c = 0;
+ int row_orig = row;
+ int j = 0;
+ int k, l, v;
+ unsigned int col;
+
+ /* Extract the paragraph's contents, omitting unused and fragment cells. */
+ while (row < m_start + m_len) {
+ row_data = m_ring->index(row++);
+ if (row_data == nullptr)
+ break;
+
+ if (line == VTE_BIDI_PARAGRAPH_LENGTH_MAX) {
+ /* Overlong paragraph, bail out. */
+ return explicit_paragraph (row_orig, rtl);
+ }
+
+ /* 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);
+ 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);
+ }
+
+ lines[++line] = c;
+
+ if (!row_data->attr.soft_wrapped)
+ break;
+ }
+
+ if (lines == 0) {
+ // huh?
+ return explicit_paragraph (row_orig, rtl);
}
- pbase_dir = (rowdata->attr.bidi_flags & VTE_BIDI_AUTO)
- ? FRIBIDI_PAR_ON
- : (rowdata->attr.bidi_flags & VTE_BIDI_RTL) ? FRIBIDI_PAR_RTL : FRIBIDI_PAR_LTR;
+ /* Run the BiDi algorithm on the paragraph to get the embedding levels. */
- fribidi_log2vis (str, i, &pbase_dir, NULL, L_to_V, V_to_L, NULL);
+ // FIXME are the WLTR / WRTL paragraph directions what I think they are?
+ pbase_dir = autodir ? (rtl ? FRIBIDI_PAR_WRTL : FRIBIDI_PAR_WLTR)
+ : (rtl ? FRIBIDI_PAR_RTL : FRIBIDI_PAR_LTR );
- if (pbase_dir == FRIBIDI_PAR_ON) {
- pbase_dir = (rowdata->attr.bidi_flags & VTE_BIDI_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);
+
+ if (level == 0) {
+ /* error */
+ return explicit_paragraph (row_orig, rtl);
}
- if (pbase_dir == FRIBIDI_PAR_RTL || pbase_dir == FRIBIDI_PAR_WRTL) {
- if (i < width) {
- /* shift to the right */
- int shift = width - i;
- for (i--; i >= 0; i--) {
- L_to_V[i] += shift;
- V_to_L[i + shift] = V_to_L[i];
+ /* For convenience, from now on this variable contains the resolved (i.e. possibly autodetected)
value. */
+ rtl = (pbase_dir == FRIBIDI_PAR_RTL || pbase_dir == FRIBIDI_PAR_WRTL);
+
+ if (level == 1 || (rtl && level == 2)) {
+ /* Fast shortcut for LTR-only and RTL-only. */
+ return explicit_paragraph (row_orig, rtl);
+ }
+
+ /* Reshuffle line by line. */
+ row = row_orig;
+ line = 0;
+ while (row < m_start + m_len) {
+ if (G_UNLIKELY (row < m_start)) {
+ row++;
+ line++;
+ continue;
+ }
+
+ map = m_bidimaps[row - m_start];
+
+ row_data = m_ring->index(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);
+ if (cell->attr.fragment())
+ continue;
+
+ fribidi_map[k++] = j;
+ }
+
+ g_assert_cmpint (k, ==, lines[line + 1]);
+
+ // 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.
+ level = fribidi_reorder_line (FRIBIDI_FLAGS_DEFAULT,
+ fribidi_chartypes,
+ lines[line + 1] - lines[line],
+ lines[line],
+ pbase_dir,
+ fribidi_levels,
+ NULL,
+ fribidi_map);
+
+ if (level == 0) {
+ /* error, what should we do? */
+ explicit_line (row, rtl);
+ goto cont;
+ }
+
+ // FIXME can we do LTR-only and RTL-only shortcuts, just like with
fribidi_get_par_embedding_levels_ex() ?
+
+ /* Copy to our realm. Proceed in visual order.*/
+ v = 0;
+ if (rtl) {
+ /* Unused cell 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 (j = lines[line]; j < lines[line + 1]; j++) {
+ /* Inflate fribidi's result by inserting fragments. */
+ l = fribidi_map[j];
+ cell = _vte_row_data_get (row_data, l);
+ g_assert (!cell->attr.fragment());
+ g_assert (cell->attr.columns() > 0);
+ if (fribidi_levels[l] % 2 == 0) {
+ /* LTR character directionality. */
+ for (col = 0; col < cell->attr.columns(); col++) {
+ map[v].vis2log = l;
+ map[v].vis_rtl = FALSE;
+ v++;
+ l++;
+ }
+ } 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;
+ }
+ v += cell->attr.columns();
+ l += cell->attr.columns();
}
- for (i = 0; i < shift; i++) {
- L_to_V[width - 1 - i] = i;
- V_to_L[i] = width - 1 - i;
+ }
+ if (!rtl) {
+ /* Unused cell 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;
}
}
- } else {
- for (; i < width; i++) {
- L_to_V[i] = V_to_L[i] = i;
+ g_assert_cmpint (v, ==, m_width);
+
+ /* From vis2log create the log2vis mapping too */
+ if (_vte_debug_on (VTE_DEBUG_BIDI)) {
+ for (l = 0; l < m_width; l++) {
+ map[l].log2vis = -1;
+ }
}
- }
-}
-#else /* WITH_FRIBIDI */
+ for (v = 0; v < m_width; v++) {
+ map[map[v].vis2log].log2vis = v;
+ }
-void bidi_shuffle (const VteRowData *rowdata, int width) {
- if (rowdata == NULL) { // FIXME make sure it doesn't happen
- bidi_shuffle_explicit (width, FALSE);
- } else {
- bidi_shuffle_explicit (width, rowdata->attr.bidi_flags & VTE_BIDI_RTL);
- }
-}
+ if (_vte_debug_on (VTE_DEBUG_BIDI)) {
+ for (l = 0; l < m_width; l++) {
+ g_assert_cmpint (map[l].log2vis, !=, -1);
+ }
+ }
-#endif /* WITH_FRIBIDI */
+cont:
+ line++;
-int log2vis (int log) {
- return L_to_V[log];
-}
+ if (!row_data->attr.soft_wrapped)
+ break;
+ }
+
+ return row;
-int vis2log (int vis) {
- return V_to_L[vis];
+#endif /* !WITH_FRIBIDI */
}
diff --git a/src/bidi.hh b/src/bidi.hh
index 58fddf04..6291f662 100644
--- a/src/bidi.hh
+++ b/src/bidi.hh
@@ -26,7 +26,7 @@
struct _bidicellmap {
int log2vis;
int vis2log;
- guint8 rtl: 1;
+ guint8 vis_rtl: 1;
};
typedef struct _bidicellmap bidicellmap;
@@ -59,6 +59,10 @@ private:
long m_height_alloc;
long m_width_alloc;
+
+ void explicit_line(long row, gboolean rtl);
+ long explicit_paragraph(long row, gboolean rtl);
+ long paragraph(long row);
};
@@ -68,16 +72,4 @@ private:
G_BEGIN_DECLS
-void bidi_shuffle (const VteRowData *rowdata, int width);
-int log2vis (int log);
-int vis2log (int vis);
-
-struct _bidimap {
- vte::base::Ring *ring;
-};
-
-typedef struct _bidimap bidimap;
-
-
-
G_END_DECLS
diff --git a/src/vte.cc b/src/vte.cc
index ca446930..7b5e2296 100644
--- a/src/vte.cc
+++ b/src/vte.cc
@@ -3018,7 +3018,7 @@ Terminal::maybe_apply_bidi_attributes()
const VteRowData *rowdata = _vte_ring_index (m_screen->row_data, row - 1);
if (rowdata != nullptr && rowdata->attr.soft_wrapped) {
_vte_debug_print(VTE_DEBUG_BIDI,
- "No, not after a hard wrap.\n");
+ "No, we're not after a hard wrap.\n");
return;
}
}
@@ -9028,7 +9028,7 @@ Terminal::draw_rows(VteScreen *screen_,
items[item_count].columns = j - col;
items[item_count].x = col * column_width;
items[item_count].y = y;
- items[item_count].mirror = !!(row_data->attr.bidi_flags & VTE_BIDI_RTL); // FIXME
+ items[item_count].mirror = bidimap[i].vis_rtl;
items[item_count].box_mirror = !!(row_data->attr.bidi_flags & VTE_BIDI_BOX_MIRROR);
item_count++;
@@ -9154,10 +9154,20 @@ Terminal::paint_cursor()
if (CLAMP(col, 0, m_column_count - 1) != col)
return;
+
+
+
+ // FIXME find a nicer place for these
+ m_ringview.set_ring (m_screen->row_data);
+ m_ringview.set_rows ((long) m_screen->scroll_delta, m_row_count + 2);
+ m_ringview.set_width (m_column_count);
+ m_ringview.update ();
+
+
+
/* Find the first cell of the character "under" the cursor.
* This is for CJK. For TAB, paint the cursor where it really is. */
VteRowData const *row_data = find_row_data(drow);
- m_ringview.update();
bidicellmap const *bidimap = m_ringview.get_row_map(drow);
auto cell = find_charcell(col, drow);
diff --git a/src/vtedefines.hh b/src/vtedefines.hh
index 71896a76..aa64c27c 100644
--- a/src/vtedefines.hh
+++ b/src/vtedefines.hh
@@ -136,3 +136,6 @@
/* Max depth of title stack */
#define VTE_WINDOW_TITLE_STACK_MAX_DEPTH (8)
+
+/* Maximum length of a paragraph, in lines, that might get proper BiDi treatment. */
+#define VTE_BIDI_PARAGRAPH_LENGTH_MAX 20
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