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wlr_scene_buffer: Call output enter/leave after primary_output calculation

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This commit is contained in:
Alexander Orzechowski 2022-06-02 10:33:04 -04:00
parent 6936e163b5
commit 4772eec93d
1 changed files with 19 additions and 3 deletions
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22
types/scene/wlr_scene.c
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@ -205,6 +205,14 @@ static void scene_buffer_update_outputs(
int largest_overlap = 0;
scene_buffer->primary_output = NULL;
uint64_t active_outputs = 0;
// let's update the outputs in two steps:
// - the primary outputs
// - the enter/leave signals
// This ensures that the enter/leave signals can rely on the primary output
// to have a reasonable value. Otherwise, they may get a value that's in
// the middle of a calculation.
struct wlr_scene_output *scene_output;
wl_list_for_each(scene_output, &scene->outputs, link) {
struct wlr_box output_box = {
@ -216,7 +224,6 @@ static void scene_buffer_update_outputs(
struct wlr_box intersection;
bool intersects = wlr_box_intersection(&intersection, &buffer_box, &output_box);
bool intersects_before = scene_buffer->active_outputs & (1ull << scene_output->index);
if (intersects) {
int overlap = intersection.width * intersection.height;
@ -224,13 +231,22 @@ static void scene_buffer_update_outputs(
largest_overlap = overlap;
scene_buffer->primary_output = scene_output;
}
active_outputs |= 1ull << scene_output->index;
}
}
uint64_t old_active = scene_buffer->active_outputs;
scene_buffer->active_outputs = active_outputs;
wl_list_for_each(scene_output, &scene->outputs, link) {
uint64_t mask = 1ull << scene_output->index;
bool intersects = active_outputs & mask;
bool intersects_before = old_active & mask;
if (intersects && !intersects_before) {
scene_buffer->active_outputs |= 1ull << scene_output->index;
wlr_signal_emit_safe(&scene_buffer->events.output_enter, scene_output);
} else if (!intersects && intersects_before) {
scene_buffer->active_outputs &= ~(1ull << scene_output->index);
wlr_signal_emit_safe(&scene_buffer->events.output_leave, scene_output);
}
}