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| author | Po Lu <luangruo@yahoo.com> | 2022-03-05 10:05:14 +0800 |
|---|---|---|
| committer | Po Lu <luangruo@yahoo.com> | 2022-03-05 10:05:14 +0800 |
| commit | 76d79e1576956eb0c07eb830fd75f7b7c4192efe (patch) | |
| tree | 2393a110b4157a1efda9f4dc2a91377de3275cf0 | |
| parent | 6efed75ff3158214d16482f2bcca06c9ac010da4 (diff) | |
| download | emacs-76d79e1576956eb0c07eb830fd75f7b7c4192efe.tar.gz emacs-76d79e1576956eb0c07eb830fd75f7b7c4192efe.tar.bz2 emacs-76d79e1576956eb0c07eb830fd75f7b7c4192efe.zip | |
Prevent some NoExpose events from being generated
* src/xterm.c (x_scroll_run): Use the rendering extension if
available to avoid NoExpose events.
| -rw-r--r-- | src/xterm.c | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/src/xterm.c b/src/xterm.c index 948afa56808..89ec43b4705 100644 --- a/src/xterm.c +++ b/src/xterm.c @@ -6037,12 +6037,24 @@ x_scroll_run (struct window *w, struct run *run) } else #endif /* USE_CAIRO */ - XCopyArea (FRAME_X_DISPLAY (f), - FRAME_X_DRAWABLE (f), FRAME_X_DRAWABLE (f), - f->output_data.x->normal_gc, - x, from_y, - width, height, - x, to_y); + { +#ifdef HAVE_XRENDER + /* Avoid useless NoExpose events. This way, we only get regular + exposure events when there is actually something to + expose. */ + if (FRAME_X_PICTURE (f) != None) + XRenderComposite (FRAME_X_DISPLAY (f), PictOpSrc, FRAME_X_PICTURE (f), + None, FRAME_X_PICTURE (f), x, from_y, 0, 0, x, to_y, + width, height); + else +#endif + XCopyArea (FRAME_X_DISPLAY (f), + FRAME_X_DRAWABLE (f), FRAME_X_DRAWABLE (f), + f->output_data.x->normal_gc, + x, from_y, + width, height, + x, to_y); + } unblock_input (); } |