return line_top_y + line_height;
}
+/* Subroutine of pos_visible_p below. Extracts a display string, if
+ any, from the display spec given as its argument. */
+static Lisp_Object
+string_from_display_spec (Lisp_Object spec)
+{
+ if (CONSP (spec))
+ {
+ while (CONSP (spec))
+ {
+ if (STRINGP (XCAR (spec)))
+ return XCAR (spec);
+ spec = XCDR (spec);
+ }
+ }
+ else if (VECTORP (spec))
+ {
+ ptrdiff_t i;
+
+ for (i = 0; i < ASIZE (spec); i++)
+ {
+ if (STRINGP (AREF (spec, i)))
+ return AREF (spec, i);
+ }
+ return Qnil;
+ }
+
+ return spec;
+}
/* Return 1 if position CHARPOS is visible in window W.
CHARPOS < 0 means return info about WINDOW_END position.
}
}
}
+ else if (IT_CHARPOS (it) != charpos)
+ {
+ Lisp_Object cpos = make_number (charpos);
+ Lisp_Object spec = Fget_char_property (cpos, Qdisplay, Qnil);
+ Lisp_Object string = string_from_display_spec (spec);
+ int newline_in_string = 0;
+
+ if (STRINGP (string))
+ {
+ const char *s = SSDATA (string);
+ const char *e = s + SBYTES (string);
+ while (s < e)
+ {
+ if (*s++ == '\n')
+ {
+ newline_in_string = 1;
+ break;
+ }
+ }
+ }
+ /* The tricky code below is needed because there's a
+ discrepancy between move_it_to and how we set cursor
+ when the display line ends in a newline from a
+ display string. move_it_to will stop _after_ such
+ display strings, whereas set_cursor_from_row
+ conspires with cursor_row_p to place the cursor on
+ the first glyph produced from the display string. */
+
+ /* We have overshoot PT because it is covered by a
+ display property whose value is a string. If the
+ string includes embedded newlines, we are also in the
+ wrong display line. Backtrack to the correct line,
+ where the display string begins. */
+ if (newline_in_string)
+ {
+ Lisp_Object startpos, endpos;
+ EMACS_INT start, end;
+ struct it it3;
+
+ /* Find the first and the last buffer positions
+ covered by the display string. */
+ endpos =
+ Fnext_single_char_property_change (cpos, Qdisplay,
+ Qnil, Qnil);
+ startpos =
+ Fprevious_single_char_property_change (endpos, Qdisplay,
+ Qnil, Qnil);
+ start = XFASTINT (startpos);
+ end = XFASTINT (endpos);
+ /* Move to the last buffer position before the
+ display property. */
+ start_display (&it3, w, top);
+ move_it_to (&it3, start - 1, -1, -1, -1, MOVE_TO_POS);
+ /* Move forward one more line if the position before
+ the display string is a newline or if it is the
+ rightmost character on a line that is
+ continued or word-wrapped. */
+ if (it3.method == GET_FROM_BUFFER
+ && it3.c == '\n')
+ move_it_by_lines (&it3, 1);
+ else if (move_it_in_display_line_to (&it3, -1,
+ it3.current_x
+ + it3.pixel_width,
+ MOVE_TO_X)
+ == MOVE_LINE_CONTINUED)
+ {
+ move_it_by_lines (&it3, 1);
+ /* When we are under word-wrap, the #$@%!
+ move_it_by_lines moves 2 lines, so we need to
+ fix that up. */
+ if (it3.line_wrap == WORD_WRAP)
+ move_it_by_lines (&it3, -1);
+ }
+
+ /* Record the vertical coordinate of the display
+ line where we wound up. */
+ top_y = it3.current_y;
+ if (it3.bidi_p)
+ {
+ /* When characters are reordered for display,
+ the character displayed to the left of the
+ display string could be _after_ the display
+ property in the logical order. Use the
+ smallest vertical position of these two. */
+ start_display (&it3, w, top);
+ move_it_to (&it3, end + 1, -1, -1, -1, MOVE_TO_POS);
+ if (it3.current_y < top_y)
+ top_y = it3.current_y;
+ }
+ /* Move from the top of the window to the beginning
+ of the display line where the display string
+ begins. */
+ start_display (&it3, w, top);
+ move_it_to (&it3, -1, 0, top_y, -1, MOVE_TO_X | MOVE_TO_Y);
+ /* Finally, advance the iterator until we hit the
+ first display element whose character position is
+ CHARPOS, or until the first newline from the
+ display string, which signals the end of the
+ display line. */
+ while (get_next_display_element (&it3))
+ {
+ PRODUCE_GLYPHS (&it3);
+ if (IT_CHARPOS (it3) == charpos
+ || ITERATOR_AT_END_OF_LINE_P (&it3))
+ break;
+ set_iterator_to_next (&it3, 0);
+ }
+ top_x = it3.current_x - it3.pixel_width;
+ /* Normally, we would exit the above loop because we
+ found the display element whose character
+ position is CHARPOS. For the contingency that we
+ didn't, and stopped at the first newline from the
+ display string, move back over the glyphs
+ prfoduced from the string, until we find the
+ rightmost glyph not from the string. */
+ if (IT_CHARPOS (it3) != charpos && EQ (it3.object, string))
+ {
+ struct glyph *g = it3.glyph_row->glyphs[TEXT_AREA]
+ + it3.glyph_row->used[TEXT_AREA];
+
+ while (EQ ((g - 1)->object, string))
+ {
+ --g;
+ top_x -= g->pixel_width;
+ }
+ xassert (g < it3.glyph_row->glyphs[TEXT_AREA]
+ + it3.glyph_row->used[TEXT_AREA]);
+ }
+ }
+ }
*x = top_x;
*y = max (top_y + max (0, it.max_ascent - it.ascent), window_top_y);
move_it_to (&it2, start_pos, -1, -1, it2.vpos + 1,
MOVE_TO_POS | MOVE_TO_VPOS);
}
- while (!IT_POS_VALID_AFTER_MOVE_P (&it2));
+ while (!(IT_POS_VALID_AFTER_MOVE_P (&it2)
+ /* If we are in a display string which starts at START_POS,
+ and that display string includes a newline, and we are
+ right after that newline (i.e. at the beginning of a
+ display line), exit the loop, because otherwise we will
+ infloop, since move_it_to will see that it is already at
+ START_POS and will not move. */
+ || (it2.method == GET_FROM_STRING
+ && IT_CHARPOS (it2) == start_pos
+ && SREF (it2.string, IT_STRING_BYTEPOS (it2) - 1) == '\n')));
xassert (IT_CHARPOS (*it) >= BEGV);
SAVE_IT (it3, it2, it3data);