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optimized math of alpha_step

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This commit is contained in:
William McKinnon 2023-05-30 00:33:31 -04:00
parent 2d14d1eaa4
commit 4c6826386d
2 changed files with 6 additions and 6 deletions
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1
include/sway/output.h
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@ -64,6 +64,7 @@ struct sway_output {
struct timespec last_presentation;
uint32_t refresh_nsec;
float refresh_sec;
int max_render_time; // In milliseconds
struct wl_event_source *repaint_timer;
};

11
sway/desktop/output.c
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@ -525,17 +525,13 @@ static void containers_tick_alpha(list_t *containers, struct sway_output *output
// TODO: config for animation_duration
float animation_duration = 0.5;
const long NSEC_IN_SECONDS = 1000000000;
float output_refresh_seconds = (float)output->refresh_nsec / NSEC_IN_SECONDS;
float num_refreshes_to_animate = animation_duration / output_refresh_seconds;
float alpha_step;
for (int i = 0; i < containers->length; ++i) {
struct sway_container *con = containers->items[i];
if (con->pending.children) {
containers_tick_alpha(con->pending.children, output);
} else if (con->alpha < con->target_alpha) {
alpha_step = (con->target_alpha) / num_refreshes_to_animate;
alpha_step = (con->target_alpha * output->refresh_sec) / animation_duration;
// ensure that the alpha does not exceed the target_alpha
con->alpha = MIN(con->alpha + alpha_step, con->target_alpha);
output_damage_whole_container(output, con);
@ -642,7 +638,7 @@ static void handle_frame(struct wl_listener *listener, void *user_data) {
const long NSEC_IN_SECONDS = 1000000000;
struct timespec predicted_refresh = output->last_presentation;
predicted_refresh.tv_nsec += output->refresh_nsec % NSEC_IN_SECONDS;
predicted_refresh.tv_sec += output->refresh_nsec / NSEC_IN_SECONDS;
predicted_refresh.tv_sec += output->refresh_sec;
if (predicted_refresh.tv_nsec >= NSEC_IN_SECONDS) {
predicted_refresh.tv_sec += 1;
predicted_refresh.tv_nsec -= NSEC_IN_SECONDS;
@ -932,6 +928,9 @@ static void handle_present(struct wl_listener *listener, void *data) {
output->last_presentation = *output_event->when;
output->refresh_nsec = output_event->refresh;
const long NSEC_IN_SECONDS = 1000000000;
output->refresh_sec = (float)output_event->refresh / NSEC_IN_SECONDS;
}
static unsigned int last_headless_num = 0;