do not draw waveform outline at x-positions where the waveform "spread" would not...

Plus a better comment.

diff --git a/libs/canvas/wave_view.cc b/libs/canvas/wave_view.cc
index 7b00b0eae78367c9ffcf5ce5c3081999d012d254..1a969d60e3f063584c7110b5989696f8a6f979c4 100644 (file)
--- a/libs/canvas/wave_view.cc
+++ b/libs/canvas/wave_view.cc
@@ -625,7 +625,11 @@ WaveView::draw_image (Cairo::RefPtr<Cairo::ImageSurface>& image, PeakData* _peak
                                        clipped = true;
                                }
 
-                               if (!clipped) {
+                               if (!clipped && tips[i].spread > 2.0) {
+                                       /* only draw the outline if the spread
+                                          implies 3 or more pixels (so that we see 1
+                                          white pixel in the middle).
+                                       */
                                        outline_context->move_to (i, tips[i].bot);
                                        /* normal lower terminal dot; line moves up */
                                        outline_context->rel_line_to (0, -1.0);
@@ -645,10 +649,15 @@ WaveView::draw_image (Cairo::RefPtr<Cairo::ImageSurface>& image, PeakData* _peak
                                }
 
                                if (!clipped) {
+                                       /* special case where only 1 pixel of
+                                        * the waveform line is drawn (and
+                                        * nothing else).
+                                        *
+                                        * we draw a 1px "line", pretending
+                                        * that the span is 1.0 (whether it is
+                                        * zero or 1.0)
+                                        */
                                        wave_context->move_to (i, tips[i].top);
-                                       /* special case where outline only is drawn.
-                                        * we draw a 1px "line", pretending that the span is 1.0
-                                       */
                                        wave_context->rel_line_to (0, 1.0);
                                }
                        }