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Preparation for dummy backends

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Dummy backends are backends that doesn't render anything on to the
screen or the target window. But they are still be useful for debug
purposes, and can be useful for other things too.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
This commit is contained in:
Yuxuan Shui
2019-08-04 16:46:09 +01:00
parent 8168c38d4f
commit d702fc9365
2 changed files with 36 additions and 26 deletions
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42
src/compton.c
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@ -1147,6 +1147,15 @@ xcb_window_t session_get_target_window(session_t *ps) {
return ps->overlay != XCB_NONE ? ps->overlay : ps->root;
}
static inline uint8_t session_redirection_mode(session_t *ps) {
if (ps->o.debug_mode || !backend_list[ps->o.backend]->present) {
// If the backend is not rendering to the screen, or if the backend
// doesn't render anything, we don't need to take over the screen.
return XCB_COMPOSITE_REDIRECT_AUTOMATIC;
}
return XCB_COMPOSITE_REDIRECT_MANUAL;
}
/**
* Redirect all windows.
*
@ -1162,9 +1171,7 @@ static bool redir_start(session_t *ps) {
xcb_map_window(ps->c, ps->overlay);
}
xcb_composite_redirect_subwindows(ps->c, ps->root,
ps->o.debug_mode ? XCB_COMPOSITE_REDIRECT_AUTOMATIC
: XCB_COMPOSITE_REDIRECT_MANUAL);
xcb_composite_redirect_subwindows(ps->c, ps->root, session_redirection_mode(ps));
x_sync(ps->c);
@ -1210,9 +1217,7 @@ static void redir_stop(session_t *ps) {
destroy_backend(ps);
xcb_composite_unredirect_subwindows(ps->c, ps->root,
ps->o.debug_mode ? XCB_COMPOSITE_REDIRECT_AUTOMATIC
: XCB_COMPOSITE_REDIRECT_MANUAL);
xcb_composite_unredirect_subwindows(ps->c, ps->root, session_redirection_mode(ps));
// Unmap overlay window
if (ps->overlay)
xcb_unmap_window(ps->c, ps->overlay);
@ -1845,19 +1850,24 @@ static session_t *session_init(int argc, char **argv, Display *dpy,
rebuild_screen_reg(ps);
// Create registration window
if (!ps->o.debug_mode && !register_cm(ps)) {
// If we are not taking over the screen, we don't need to register as a compositor
if (session_redirection_mode(ps) == XCB_COMPOSITE_REDIRECT_MANUAL && !register_cm(ps)) {
exit(1);
}
// Overlay must be initialized before double buffer, and before creation
// of OpenGL context.
if (!ps->o.debug_mode) {
if (!init_overlay(ps)) {
goto err;
}
} else {
if (!init_debug_window(ps)) {
goto err;
// Target window must be initialized before the backend
//
// backend_operations::present == NULL means this backend doesn't need a target
// window
if (backend_list[ps->o.backend]->present != NULL) {
if (!ps->o.debug_mode) {
if (!init_overlay(ps)) {
goto err;
}
} else {
if (!init_debug_window(ps)) {
goto err;
}
}
}