From: Sebastian Keller <skeller@gnome.org>
Date: Sat, 13 Feb 2021 20:13:57 +0000 (+0100)
Subject: st/scroll-view-fade: Fix vertical top fading
X-Git-Tag: archive/raspbian/50.5-1+rpi1~1^2~616^2^2~352
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/%22/%22http:/www.example.com/cgi/%22?a=commitdiff_plain;h=2501bc5c8f97581a3ea1bb141feb5c721a316de7;p=gnome-shell.git

st/scroll-view-fade: Fix vertical top fading

The fade for the vertical top edge was calculating the fade ratio for a
larger height (up to where the bottom fade starts) than it was
displaying.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1674>
---

diff --git a/src/st/st-scroll-view-fade.glsl b/src/st/st-scroll-view-fade.glsl
index 2eacfd9af..e3f1a259f 100644
--- a/src/st/st-scroll-view-fade.glsl
+++ b/src/st/st-scroll-view-fade.glsl
@@ -55,7 +55,7 @@ void main ()
 
         float vfade_scale = height / vfade_offset;
         if (fade_top) {
-            ratio *= (fade_area_topleft[1] - y) / (fade_area_topleft[1] - fade_bottom_start);
+            ratio *= (fade_area_topleft[1] - y) / (fade_area_topleft[1] - fade_top_start);
         }
 
         if (fade_bottom) {