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; * src/xdisp.c: Minor improvements of the commentary.

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Eli Zaretskii 2023-07-18 14:58:09 +03:00
parent ce3f9fba1a
commit 77f489421e
1 changed files with 17 additions and 15 deletions
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src/xdisp.c
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@ -107,31 +107,33 @@ along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
. try_cursor_movement
This function tries to update the display if the text in the
window did not change and did not scroll, only point moved, and
it did not move off the displayed portion of the text.
This optimization is applicable if the text in the window did
not change and did not scroll, only point moved, and it did not
move off the displayed portion of the text. In that case, the
window's glyph matrix is still valid, and only the position of
the cursor might need to be updated.
. try_window_reusing_current_matrix
This function reuses the current matrix of a window when text
has not changed, but the window start changed (e.g., due to
This function reuses the current glyph matrix of a window when
text has not changed, but the window start changed (e.g., due to
scrolling).
. try_window_id
This function attempts to redisplay a window by reusing parts of
its existing display. It finds and reuses the part that was not
changed, and redraws the rest. (The "id" part in the function's
name stands for "insert/delete", not for "identification" or
somesuch.)
This function attempts to update a window's glyph matrix by
reusing parts of its current glyph matrix. It finds and reuses
the part that was not changed, and regenerates the rest. (The
"id" part in the function's name stands for "insert/delete", not
for "identification" or somesuch.)
. try_window
This function performs the full, unoptimized, redisplay of a
single window assuming that its fonts were not changed and that
the cursor will not end up in the scroll margins. (Loading
fonts requires re-adjustment of dimensions of glyph matrices,
which makes this method impossible to use.)
This function performs the full, unoptimized, generation of a
single window's glyph matrix, assuming that its fonts were not
changed and that the cursor will not end up in the scroll
margins. (Loading fonts requires re-adjustment of dimensions of
glyph matrices, which makes this method impossible to use.)
The optimizations are tried in sequence (some can be skipped if
it is known that they are not applicable). If none of the