Adjust scale for fractional-scale-v1

1 files changed, 10 insertions, 0 deletions

diff --git a/sway/config/output.c b/sway/config/output.c
index e2e48e4c..3b524433 100644
--- a/sway/config/output.c
+++ b/sway/config/output.c
@@ -460,6 +460,16 @@ static void queue_output_config(struct output_config *oc,
         float scale;
         if (oc && oc->scale > 0) {
                 scale = oc->scale;
+
+                // The factional-scale-v1 protocol uses increments of 120ths to send
+                // the scale factor to the client. Adjust the scale so that we use the
+                // same value as the clients'.
+                float adjusted_scale = round(scale * 120) / 120;
+                if (scale != adjusted_scale) {
+                        sway_log(SWAY_INFO, "Adjusting output scale from %f to %f",
+                                scale, adjusted_scale);
+                        scale = adjusted_scale;
+                }
         } else {
                 scale = compute_default_scale(wlr_output, pending);
                 sway_log(SWAY_DEBUG, "Auto-detected output scale: %f", scale);