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output: save and restore crtc upon (de)activation

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The crtc is saved from kmscon_output_activate, and restored from
kmscon_output_deactivate.
This means that when the program exits, the screen is back to what it
was - we don't need to switch back VTs if we started the program from an
fbcon, etc.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
This commit is contained in:
Ran Benita 2011-11-29 00:27:30 +02:00 committed by David Herrmann
parent 25b85f5f26
commit aacb342092
1 changed files with 27 additions and 7 deletions
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34
src/output.c
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@ -72,6 +72,8 @@ struct kmscon_output {
unsigned int cur_rb;
struct render_buffer rb[2];
GLuint fb;
drmModeCrtcPtr saved_crtc;
};
enum compositor_state {
@ -561,6 +563,8 @@ static void destroy_rb(struct render_buffer *rb,
* This activates the output in the given mode. This returns -EALREADY if the
* output is already activated. To switch modes, deactivate and then reactivate
* the output.
* When the output is activated, its previous screen contents and mode are
* saved, to be restored when the output is deactivated.
* Returns 0 on success.
* This does not work if the compositor is asleep.
*/
@ -583,15 +587,16 @@ int kmscon_output_activate(struct kmscon_output *output,
mode = output->modes;
comp = output->comp;
output->saved_crtc = drmModeGetCrtc(comp->drm_fd, output->crtc_id);
ret = init_rb(&output->rb[0], comp, &mode->info);
if (ret)
return ret;
goto err_saved;
ret = init_rb(&output->rb[1], comp, &mode->info);
if (ret) {
destroy_rb(&output->rb[0], comp);
return ret;
goto err_saved;
}
output->current = mode;
@ -625,23 +630,38 @@ err_fb:
destroy_rb(&output->rb[1], output->comp);
output->active = 0;
output->current = NULL;
err_saved:
if (output->saved_crtc) {
drmModeFreeCrtc(output->saved_crtc);
output->saved_crtc = NULL;
}
return ret;
}
/*
* Deactivate the output. This does not disconnect the output so you can
* reactivate this output again.
* When the output is deactivated, the screen contents and mode it had before
* it was activated are restored.
*/
void kmscon_output_deactivate(struct kmscon_output *output)
{
if (!output || !output->active)
return;
/*
* TODO: Do we need to reset the CRTC/connector here? We delete an
* active framebuffer here so the crtc will become blank, but instead
* the previous framebuffer should be restored.
*/
if (output->saved_crtc) {
drmModeSetCrtc(output->comp->drm_fd,
output->saved_crtc->crtc_id,
output->saved_crtc->buffer_id,
output->saved_crtc->x,
output->saved_crtc->y,
&output->conn_id,
1,
&output->saved_crtc->mode);
drmModeFreeCrtc(output->saved_crtc);
output->saved_crtc = NULL;
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glDeleteFramebuffers(1, &output->fb);