Jinoh Kang : user32: Fix rounding in premultiplied alpha conversion for cursors and icons.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: c4773e1823d4ed48e2f3918bf6a8753fcb2f645f
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=c4773e1823d4ed48e2f3918bf...

Author: Jinoh Kang <jinoh.kang.kr(a)gmail.com>
Date:   Tue Mar 15 03:14:17 2022 +0900

user32: Fix rounding in premultiplied alpha conversion for cursors and icons.

Signed-off-by: Jinoh Kang <jinoh.kang.kr(a)gmail.com>
Signed-off-by: Alexandre Julliard <julliard(a)winehq.org>

---

 dlls/user32/cursoricon.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/dlls/user32/cursoricon.c b/dlls/user32/cursoricon.c
index cab9fbde32e..abf3a5dac53 100644
--- a/dlls/user32/cursoricon.c
+++ b/dlls/user32/cursoricon.c
@@ -775,9 +775,9 @@ static HBITMAP create_alpha_bitmap( HBITMAP color, const BITMAPINFO *src_info, c
     for (i = 0, ptr = bits; i < bm.bmWidth * bm.bmHeight; i++, ptr += 4)
     {
         unsigned int alpha = ptr[3];
-        ptr[0] = ptr[0] * alpha / 255;
-        ptr[1] = ptr[1] * alpha / 255;
-        ptr[2] = ptr[2] * alpha / 255;
+        ptr[0] = (ptr[0] * alpha + 127) / 255;
+        ptr[1] = (ptr[1] * alpha + 127) / 255;
+        ptr[2] = (ptr[2] * alpha + 127) / 255;
     }
 
 done: