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output, output_damage: add docs
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2 changed files with 37 additions and 0 deletions
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@ -38,6 +38,15 @@ struct wlr_output_cursor {
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struct wlr_output_impl;
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struct wlr_output_impl;
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/**
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* A compositor output region. This typically corresponds to a monitor that
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* displays part of the compositor space.
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*
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* Compositors should listen to the `frame` event to render an output. They
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* should call `wlr_output_make_current`, render and then call
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* `wlr_output_swap_buffers`. No rendering should happen outside a `frame` event
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* handler.
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*/
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struct wlr_output {
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struct wlr_output {
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const struct wlr_output_impl *impl;
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const struct wlr_output_impl *impl;
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struct wlr_backend *backend;
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struct wlr_backend *backend;
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@ -10,6 +10,14 @@
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*/
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*/
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#define WLR_OUTPUT_DAMAGE_PREVIOUS_LEN 2
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#define WLR_OUTPUT_DAMAGE_PREVIOUS_LEN 2
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/**
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* Tracks damage for an output.
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*
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* When a `frame` event is emitted, `wlr_output_damage_make_current` should be
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* called. If necessary, the output should be repainted and
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* `wlr_output_damage_swap_buffers` should be called. No rendering should happen
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* outside a `frame` event handler.
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*/
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struct wlr_output_damage {
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struct wlr_output_damage {
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struct wlr_output *output;
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struct wlr_output *output;
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@ -32,13 +40,33 @@ struct wlr_output_damage {
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struct wlr_output_damage *wlr_output_damage_create(struct wlr_output *output);
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struct wlr_output_damage *wlr_output_damage_create(struct wlr_output *output);
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void wlr_output_damage_destroy(struct wlr_output_damage *output_damage);
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void wlr_output_damage_destroy(struct wlr_output_damage *output_damage);
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/**
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* Makes the output rendering context current. `needs_swap` is set to true if
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* `wlr_output_damage_swap_buffers` needs to be called. The region of the output
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* that needs to be repainted is added to `damage`.
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*/
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bool wlr_output_damage_make_current(struct wlr_output_damage *output_damage,
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bool wlr_output_damage_make_current(struct wlr_output_damage *output_damage,
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bool *needs_swap, pixman_region32_t *damage);
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bool *needs_swap, pixman_region32_t *damage);
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/**
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* Swaps the output buffers. If the time of the frame isn't known, set `when` to
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* NULL.
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*
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* Swapping buffers schedules a `frame` event.
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*/
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bool wlr_output_damage_swap_buffers(struct wlr_output_damage *output_damage,
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bool wlr_output_damage_swap_buffers(struct wlr_output_damage *output_damage,
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struct timespec *when, pixman_region32_t *damage);
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struct timespec *when, pixman_region32_t *damage);
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/**
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* Accumulates damage and schedules a `frame` event.
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*/
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void wlr_output_damage_add(struct wlr_output_damage *output_damage,
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void wlr_output_damage_add(struct wlr_output_damage *output_damage,
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pixman_region32_t *damage);
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pixman_region32_t *damage);
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/**
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* Damages the whole output and schedules a `frame` event.
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*/
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void wlr_output_damage_add_whole(struct wlr_output_damage *output_damage);
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void wlr_output_damage_add_whole(struct wlr_output_damage *output_damage);
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/**
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* Accumulates damage from a box and schedules a `frame` event.
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*/
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void wlr_output_damage_add_box(struct wlr_output_damage *output_damage,
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void wlr_output_damage_add_box(struct wlr_output_damage *output_damage,
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struct wlr_box *box);
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struct wlr_box *box);
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