Force bilinear scaling when scaling down

1 files changed, 10 insertions, 2 deletions

diff --git a/sway/desktop/output.c b/sway/desktop/output.c
index 600423bc..b8f2d32d 100644
--- a/sway/desktop/output.c
+++ b/sway/desktop/output.c
@@ -183,7 +183,15 @@ static void send_frame_done_iterator(struct wlr_scene_buffer *buffer,
         }
 }
 
-static enum wlr_scale_filter_mode get_scale_filter(struct sway_output *output) {
+static enum wlr_scale_filter_mode get_scale_filter(struct sway_output *output,
+                struct wlr_scene_buffer *buffer) {
+        // if we are scaling down, we should always choose linear
+        if (buffer->dst_width > 0 && buffer->dst_height > 0 && (
+                        buffer->dst_width < buffer->buffer_width ||
+                        buffer->dst_height < buffer->buffer_height)) {
+                return WLR_SCALE_FILTER_BILINEAR;
+        }
+
         switch (output->scale_filter) {
         case SCALE_FILTER_LINEAR:
                 return WLR_SCALE_FILTER_BILINEAR;
@@ -212,7 +220,7 @@ static void output_configure_scene(struct sway_output *output,
                 // hack: don't call the scene setter because that will damage all outputs
                 // We don't want to damage outputs that aren't our current output that
                 // we're configuring
-                buffer->filter_mode = get_scale_filter(output);
+                buffer->filter_mode = get_scale_filter(output, buffer);
 
                 wlr_scene_buffer_set_opacity(buffer, opacity);
         } else if (node->type == WLR_SCENE_NODE_TREE) {