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wlr_scene: Add primary_output property to wlr_scene_buffer
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2 changed files with 19 additions and 0 deletions
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@ -117,6 +117,14 @@ struct wlr_scene_buffer {
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struct wl_signal output_present; // struct wlr_scene_output
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} events;
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/**
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* The output that the largest area of this buffer is displayed on.
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* This may be NULL if the buffer is not currently displayed on any
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* outputs. This is the output that should be used for frame callbacks,
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* presentation feedback, etc.
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*/
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struct wlr_scene_output *primary_output;
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// private state
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uint64_t active_outputs;
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@ -218,6 +218,9 @@ static void scene_buffer_update_outputs(
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struct wlr_box buffer_box = { .x = lx, .y = ly };
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scene_node_get_size(&scene_buffer->node, &buffer_box.width, &buffer_box.height);
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int largest_overlap = 0;
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scene_buffer->primary_output = NULL;
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struct wlr_scene_output *scene_output;
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wl_list_for_each(scene_output, &scene->outputs, link) {
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struct wlr_box output_box = {
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@ -231,6 +234,14 @@ static void scene_buffer_update_outputs(
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bool intersects = wlr_box_intersection(&intersection, &buffer_box, &output_box);
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bool intersects_before = scene_buffer->active_outputs & (1ull << scene_output->index);
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if (intersects) {
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int overlap = intersection.width * intersection.height;
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if (overlap > largest_overlap) {
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largest_overlap = overlap;
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scene_buffer->primary_output = scene_output;
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}
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}
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if (intersects && !intersects_before) {
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scene_buffer->active_outputs |= 1ull << scene_output->index;
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wlr_signal_emit_safe(&scene_buffer->events.output_enter, scene_output);
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