From cb1296ea17319d48320c499aa409770bc78605ae Mon Sep 17 00:00:00 2001
From: yimoxiao <73517726+yimoxiao@users.noreply.github.com>
Date: Sat, 21 Jun 2025 23:30:09 +0800
Subject: [PATCH] chore(lvglimage): fix indexed image premultiply error (#8367)

---
 scripts/LVGLImage.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/scripts/LVGLImage.py b/scripts/LVGLImage.py
index bc631a1e68..30a64a1b25 100755
--- a/scripts/LVGLImage.py
+++ b/scripts/LVGLImage.py
@@ -615,7 +615,9 @@ class LVGLImage:
 
         if self.cf.is_indexed:
 
-            def multiply(r, g, b, a):
+            def multiply(b, g, r, a):
+                # The precision is reduced, the correct way would be to divide by 255,
+                # but this is consistent with the premultiply function in the code.
                 r, g, b = (r * a) >> 8, (g * a) >> 8, (b * a) >> 8
                 return uint8_t(b) + uint8_t(g) + uint8_t(r) + uint8_t(a)