scene: add primary output to wlr_scene_surface
This allows compositors to avoid sending multiple frame done events to a surface that is rendered on multiple outputs at once. This may also be used in the same way for presentation feedback.
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@ -74,6 +74,14 @@ struct wlr_scene_surface {
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struct wlr_scene_node node;
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struct wlr_surface *surface;
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/**
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* The output that the largest area of this surface is displayed on.
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* This may be NULL if the surface 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_output *primary_output;
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// private state
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int prev_width, prev_height;
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@ -175,6 +175,9 @@ static void scene_surface_update_outputs(
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.height = scene_surface->surface->current.height,
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};
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int largest_overlap = 0;
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scene_surface->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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@ -184,10 +187,16 @@ static void scene_surface_update_outputs(
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wlr_output_effective_resolution(scene_output->output,
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&output_box.width, &output_box.height);
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// These enter/leave functions are a noop if the event has already been
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// sent for the given output.
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struct wlr_box intersection;
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if (wlr_box_intersection(&intersection, &surface_box, &output_box)) {
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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_surface->primary_output = scene_output->output;
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}
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// These enter/leave functions are a noop if the event has already been
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// sent for the given output.
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wlr_surface_send_enter(scene_surface->surface, scene_output->output);
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} else {
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wlr_surface_send_leave(scene_surface->surface, scene_output->output);
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