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output: disambiguate the two types of damage

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See https://github.com/swaywm/wlroots/issues/1665
This commit is contained in:
Simon Ser 2019-04-25 19:49:59 +03:00 committed by Drew DeVault
parent 57d32d03a8
commit 1dbece74fb
2 changed files with 11 additions and 2 deletions
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7
include/wlr/types/wlr_output.h
View file

@ -222,11 +222,16 @@ bool wlr_output_attach_render(struct wlr_output *output, int *buffer_age);
bool wlr_output_preferred_read_format(struct wlr_output *output,
enum wl_shm_format *fmt);
/**
* Set the damage region for the frame to be submitted.
* Set the damage region for the frame to be submitted. This is the region of
* the screen that has changed since the last frame.
*
* Compositors implementing damage tracking should call this function with the
* damaged region in output-buffer-local coordinates (ie. scaled and
* transformed).
*
* This region is not to be confused with the renderer's buffer damage, ie. the
* region compositors need to repaint. Compositors usually need to repaint more
* than what changed since last frame since multiple render buffers are used.
*/
void wlr_output_set_damage(struct wlr_output *output,
pixman_region32_t *damage);

6
include/wlr/types/wlr_output_damage.h
View file

@ -66,9 +66,13 @@ void wlr_output_damage_destroy(struct wlr_output_damage *output_damage);
* `needs_frame` will be set to true if a frame should be submitted. `damage`
* will be set to the region of the output that needs to be repainted, in
* output-buffer-local coordinates.
*
* The buffer damage region accumulates all damage since the buffer has last
* been swapped. This is not to be confused with the output surface damage,
* which only contains the changes between two frames.
*/
bool wlr_output_damage_attach_render(struct wlr_output_damage *output_damage,
bool *needs_frame, pixman_region32_t *damage);
bool *needs_frame, pixman_region32_t *buffer_damage);
/**
* Accumulates damage and schedules a `frame` event.
*/