Workaround T56752: redo panel alpha flicker

The bug applies to tooltips, but isn't as noticeable.

1 files changed, 15 insertions, 1 deletions

diff --git a/source/blender/editors/interface/interface_region_hud.c b/source/blender/editors/interface/interface_region_hud.c
index 89b34f3f152..914b16586ed 100644
--- a/source/blender/editors/interface/interface_region_hud.c
+++ b/source/blender/editors/interface/interface_region_hud.c
@@ -39,6 +39,7 @@
 #include "BLI_rect.h"
 #include "BLI_listbase.h"
 #include "BLI_utildefines.h"
+#include "BLI_math_color.h"
 
 #include "BKE_context.h"
 #include "BKE_screen.h"
@@ -203,7 +204,20 @@ static void hud_region_draw(const bContext *C, ARegion *ar)
 	GPU_clear(GPU_COLOR_BIT);
 
 	if ((ar->flag & RGN_FLAG_HIDDEN) == 0) {
-		ui_draw_menu_back(NULL, NULL, &(rcti){.xmax = ar->winx, .ymax = ar->winy});
+		if (0) {
+			/* Has alpha flickering glitch, see T56752. */
+			ui_draw_menu_back(NULL, NULL, &(rcti){.xmax = ar->winx, .ymax = ar->winy});
+		}
+		else {
+			/* Use basic drawing instead. */
+			bTheme *btheme = UI_GetTheme();
+			float color[4];
+			rgba_uchar_to_float(color, (const uchar *)btheme->tui.wcol_menu_back.inner);
+			const float radius = U.widget_unit * btheme->tui.wcol_menu_back.roundness;
+			UI_draw_roundbox_corner_set(UI_CNR_ALL);
+			UI_draw_roundbox_4fv(true, 0, 0, ar->winx, ar->winy, radius, color);
+		}
+
 		ED_region_panels_draw(C, ar);
 	}
 }