fix a-High/LowPass transfer-fn display visual bleed

diff --git a/scripts/hplp.lua b/scripts/hplp.lua
index 3b2459ae328256e2ae75af866db75fc8510769a8..a69fb615331b6ac41284235c89a05e45b16d837d 100644 (file)
--- a/scripts/hplp.lua
+++ b/scripts/hplp.lua
@@ -187,7 +187,7 @@ end
 
 function db_to_y (db, h)
        -- y-axis gain mapping
-       if db < -48 then db = -48 end
+       if db < -60 then db = -60 end
        if db >  12 then db =  12 end
        return -.5 + round (0.2 * h) - h * db / 60
 end
@@ -238,6 +238,8 @@ function render_inline (ctx, w, max_h)
        ctx:rectangle (0, 0, w, h)
        ctx:set_source_rgba (.2, .2, .2, 1.0)
        ctx:fill ()
+       ctx:rectangle (0, 0, w, h)
+       ctx:clip ();
 
        -- set line width: 1px
        -- Note: a cairo pixel at [1,1]  spans [0.5->1.5 , 0.5->1.5]