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[UXTHEME] -Ignore the alpha channel so that TrasnparentBlt will be used when a bitmap has an alpha channel but no pixel has alpha transparency. CORE-13464

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svn path=/trunk/; revision=75688
This commit is contained in:
Giannis Adamopoulos 2017-08-27 10:55:30 +00:00
parent 3ee6628aa5
commit 6f1a2f7dc9
1 changed files with 3 additions and 1 deletions
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4
reactos/dll/win32/uxtheme/msstyles.c
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@ -875,7 +875,6 @@ static BOOL prepare_alpha (HBITMAP bmp, BOOL* hasAlpha)
/* nothing to do */ /* nothing to do */
return TRUE; return TRUE;
*hasAlpha = TRUE;
p = dib.dsBm.bmBits; p = dib.dsBm.bmBits;
n = dib.dsBmih.biHeight * dib.dsBmih.biWidth; n = dib.dsBmih.biHeight * dib.dsBmih.biWidth;
/* AlphaBlend() wants premultiplied alpha, so do that now */ /* AlphaBlend() wants premultiplied alpha, so do that now */
@ -886,6 +885,9 @@ static BOOL prepare_alpha (HBITMAP bmp, BOOL* hasAlpha)
p[1] = (p[1] * a) >> 8; p[1] = (p[1] * a) >> 8;
p[2] = (p[2] * a) >> 8; p[2] = (p[2] * a) >> 8;
p += 4; p += 4;
if (a != 256)
*hasAlpha = TRUE;
} }
return TRUE; return TRUE;