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Refactor code that determines row->start and row->end.

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xdisp.c (find_row_end): New function, refactored from display_line.
 (display_line): Use it.
This commit is contained in:
Eli Zaretskii 2010-05-01 11:50:01 +03:00
parent 4fc8528305
commit 59ca28de83
2 changed files with 129 additions and 115 deletions
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5
src/ChangeLog
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@ -1,3 +1,8 @@
2010-05-01 Eli Zaretskii <eliz@gnu.org>
* xdisp.c (find_row_end): New function, refactored from display_line.
(display_line): Use it.
2010-04-27 Eli Zaretskii <eliz@gnu.org>
* xdisp.c (set_cursor_from_row): Fix a crash when a display string

239
src/xdisp.c
View file

@ -17370,6 +17370,123 @@ unproduce_glyphs (it, n)
glyph[-n] = *glyph;
}
/* Find the positions in a bidi-reordered ROW to serve as ROW->start
and ROW->end. */
static struct display_pos
find_row_end (it, row)
struct it *it;
struct glyph_row *row;
{
/* FIXME: Revisit this when glyph ``spilling'' in continuation
lines' rows is implemented for bidi-reordered rows. */
EMACS_INT min_pos = ZV + 1, max_pos = 0;
struct glyph *g;
struct it save_it;
struct text_pos tpos;
struct display_pos row_end = it->current;
for (g = row->glyphs[TEXT_AREA];
g < row->glyphs[TEXT_AREA] + row->used[TEXT_AREA];
g++)
{
if (BUFFERP (g->object))
{
if (g->charpos > 0 && g->charpos < min_pos)
min_pos = g->charpos;
if (g->charpos > max_pos)
max_pos = g->charpos;
}
}
/* Empty lines have a valid buffer position at their first
glyph, but that glyph's OBJECT is zero, as if it didn't come
from a buffer. If we didn't find any valid buffer positions
in this row, maybe we have such an empty line. */
if (max_pos == 0 && row->used[TEXT_AREA])
{
for (g = row->glyphs[TEXT_AREA];
g < row->glyphs[TEXT_AREA] + row->used[TEXT_AREA];
g++)
{
if (INTEGERP (g->object))
{
if (g->charpos > 0 && g->charpos < min_pos)
min_pos = g->charpos;
if (g->charpos > max_pos)
max_pos = g->charpos;
}
}
}
/* ROW->start is the value of min_pos, the minimal buffer position
we have in ROW. */
if (min_pos <= ZV)
{
/* Avoid calling the costly CHAR_TO_BYTE if possible. */
if (min_pos != row->start.pos.charpos)
SET_TEXT_POS (row->start.pos, min_pos, CHAR_TO_BYTE (min_pos));
if (max_pos == 0)
max_pos = min_pos;
}
/* For ROW->end, we need the position that is _after_ max_pos, in
the logical order, unless we are at ZV. */
if (row->ends_at_zv_p)
{
if (!row->used[TEXT_AREA])
row->start.pos = row_end.pos;
}
else if (row->used[TEXT_AREA] && max_pos)
{
int at_eol_p;
SET_TEXT_POS (tpos, max_pos, CHAR_TO_BYTE (max_pos));
save_it = *it;
it->bidi_p = 0;
reseat (it, tpos, 0);
if (!get_next_display_element (it))
abort (); /* this row cannot be at ZV, see above */
at_eol_p = ITERATOR_AT_END_OF_LINE_P (it);
set_iterator_to_next (it, 1);
row_end = it->current;
/* If the character at max_pos is not a newline and the
characters at max_pos+1 is a newline, skip that newline as
well. Note that this may skip some invisible text. */
if (!at_eol_p
&& get_next_display_element (it)
&& ITERATOR_AT_END_OF_LINE_P (it))
{
set_iterator_to_next (it, 1);
/* Record the position after the newline of a continued row.
We will need that to set ROW->end of the last row
produced for a continued line. */
if (row->continued_p)
save_it.eol_pos = it->current.pos;
else
{
row_end = it->current;
save_it.eol_pos.charpos = save_it.eol_pos.bytepos = 0;
}
}
else if (!row->continued_p
&& MATRIX_ROW_CONTINUATION_LINE_P (row)
&& it->eol_pos.charpos > 0)
{
/* Last row of a continued line. Use the position recorded
in IT->eol_pos, to the effect that the newline belongs to
this row, not to the row which displays the character
with the largest buffer position before the newline. */
row_end.pos = it->eol_pos;
it->eol_pos.charpos = it->eol_pos.bytepos = 0;
}
*it = save_it;
/* The members of ROW->end that are not taken from buffer
positions are copied from IT->current. */
row_end.string_pos = it->current.string_pos;
row_end.overlay_string_index = it->current.overlay_string_index;
row_end.dpvec_index = it->current.dpvec_index;
}
return row_end;
}
/* Construct the glyph row IT->glyph_row in the desired matrix of
IT->w from text at the current position of IT. See dispextern.h
@ -17388,7 +17505,6 @@ display_line (it)
int wrap_row_used = -1, wrap_row_ascent, wrap_row_height;
int wrap_row_phys_ascent, wrap_row_phys_height;
int wrap_row_extra_line_spacing;
struct display_pos row_end;
int cvpos;
/* We always start displaying at hpos zero even if hscrolled. */
@ -17912,120 +18028,13 @@ display_line (it)
compute_line_metrics (it);
/* Remember the position at which this line ends. */
row->end = row_end = it->current;
row->end = it->current;
/* ROW->start and ROW->end must be the smallest and the largest
buffer positions in ROW. But if ROW was bidi-reordered, these
two positions can be anywhere in the row, so we must rescan all
of the ROW's glyphs to find them. */
if (it->bidi_p)
{
/* ROW->start and ROW->end must be the smallest and largest
buffer positions in ROW. But if ROW was bidi-reordered,
these two positions can be anywhere in the row, so we must
rescan all of the ROW's glyphs to find them. */
/* FIXME: Revisit this when glyph ``spilling'' in continuation
lines' rows is implemented for bidi-reordered rows. */
EMACS_INT min_pos = ZV + 1, max_pos = 0;
struct glyph *g;
struct it save_it;
struct text_pos tpos;
for (g = row->glyphs[TEXT_AREA];
g < row->glyphs[TEXT_AREA] + row->used[TEXT_AREA];
g++)
{
if (BUFFERP (g->object))
{
if (g->charpos > 0 && g->charpos < min_pos)
min_pos = g->charpos;
if (g->charpos > max_pos)
max_pos = g->charpos;
}
}
/* Empty lines have a valid buffer position at their first
glyph, but that glyph's OBJECT is zero, as if it didn't come
from a buffer. If we didn't find any valid buffer positions
in this row, maybe we have such an empty line. */
if (min_pos == ZV + 1 && row->used[TEXT_AREA])
{
for (g = row->glyphs[TEXT_AREA];
g < row->glyphs[TEXT_AREA] + row->used[TEXT_AREA];
g++)
{
if (INTEGERP (g->object))
{
if (g->charpos > 0 && g->charpos < min_pos)
min_pos = g->charpos;
if (g->charpos > max_pos)
max_pos = g->charpos;
}
}
}
if (min_pos <= ZV)
{
if (min_pos != row->start.pos.charpos)
{
row->start.pos.charpos = min_pos;
row->start.pos.bytepos = CHAR_TO_BYTE (min_pos);
}
if (max_pos == 0)
max_pos = min_pos;
}
/* For ROW->end, we need the position that is _after_ max_pos,
in the logical order, unless we are at ZV. */
if (row->ends_at_zv_p)
{
if (!row->used[TEXT_AREA])
{
row->start.pos.charpos = row_end.pos.charpos;
row->start.pos.bytepos = row_end.pos.bytepos;
}
}
else if (row->used[TEXT_AREA] && max_pos)
{
SET_TEXT_POS (tpos, max_pos, CHAR_TO_BYTE (max_pos));
save_it = *it;
it->bidi_p = 0;
reseat (it, tpos, 0);
if (!get_next_display_element (it))
abort (); /* row at ZV was already handled above */
set_iterator_to_next (it, 1);
row_end = it->current;
/* If the character at max_pos+1 is a newline, skip that as
well. Note that this may skip some invisible text. */
if (get_next_display_element (it)
&& ITERATOR_AT_END_OF_LINE_P (it))
{
set_iterator_to_next (it, 1);
/* Record the position after the newline of a continued
row. We will need that to set ROW->end of the last
row produced for a continued line. */
if (row->continued_p)
{
save_it.eol_pos.charpos = IT_CHARPOS (*it);
save_it.eol_pos.bytepos = IT_BYTEPOS (*it);
}
else
{
row_end = it->current;
save_it.eol_pos.charpos = save_it.eol_pos.bytepos = 0;
}
}
else if (!row->continued_p
&& MATRIX_ROW_CONTINUATION_LINE_P (row)
&& it->eol_pos.charpos > 0)
{
/* Last row of a continued line. Use the position
recorded in ROW->eol_pos, to the effect that the
newline belongs to this row, not to the row which
displays the character with the largest buffer
position. */
row_end.pos = it->eol_pos;
it->eol_pos.charpos = it->eol_pos.bytepos = 0;
}
*it = save_it;
row_end.string_pos = it->current.string_pos;
row_end.overlay_string_index = it->current.overlay_string_index;
row_end.dpvec_index = it->current.dpvec_index;
row->end = row_end;
}
}
row->end = find_row_end (it, row);
/* Record whether this row ends inside an ellipsis. */
row->ends_in_ellipsis_p
@ -18079,7 +18088,7 @@ display_line (it)
the flag accordingly. */
if (it->glyph_row < MATRIX_BOTTOM_TEXT_ROW (it->w->desired_matrix, it->w))
it->glyph_row->reversed_p = row->reversed_p;
it->start = row_end;
it->start = row->end;
return row->displays_text_p;
}