Compensate inferred sprite bounds for balloon/hat/umbrella sprites

distribution/changelog.txt

@@ -5,6 +5,7 @@
 - Improved: [#23404] Folders are now paired with an icon in the load/save window.
 - Fix: [#23286] Currency formatted incorrectly in the in game console.
 - Fix: [#23348] Console set commands don't print output properly.
+- Fix: [#23376] Peeps with balloons, hats and umbrellas may leave artifacts on screen.
 
 0.4.17 (2024-12-08)
 ------------------------------------------------------------------------

src/openrct2/peep/PeepAnimationData.cpp

@@ -999,6 +999,15 @@ namespace OpenRCT2
                     continue;
 
                 anim.bounds = inferMaxAnimationDimensions(anim);
+
+                // Balloons, hats and umbrellas are painted separately, so the inference
+                // algorithm doesn't account for those. We manually compensate for these here.
+                // Between 8-12 pixels are needed, depending on rotation, so we're generalising.
+                auto pag = PeepAnimationGroup(groupKey);
+                if (pag == PeepAnimationGroup::Balloon || pag == PeepAnimationGroup::Hat || pag == PeepAnimationGroup::Umbrella)
+                {
+                    anim.bounds.sprite_height_negative += 12;
+                }
             }
         }
     }