Remove the masking when computing qAlpha()

After a bit shift of 24, only the alpha value should remain, so it is
not necessary to mask the result.
The documentation state QRgb works on a ARGB quadruplet, so the upper
bits can be assumed to be zero in the cases when QRgb is 64 bits.

This saves some time because qAlpha() is used for each pixel in the
generic blend functions.

Reviewed-by: Andreas Kling
Reviewed-by: Kim

1 files changed, 1 insertions, 1 deletions

diff --git a/src/gui/painting/qrgb.h b/src/gui/painting/qrgb.h
index 8e635a8..ea5f353 100644
--- a/src/gui/painting/qrgb.h
+++ b/src/gui/painting/qrgb.h
@@ -64,7 +64,7 @@ Q_GUI_EXPORT_INLINE int qBlue(QRgb rgb)                // get blue part of RGB
 { return (rgb & 0xff); }
 
 Q_GUI_EXPORT_INLINE int qAlpha(QRgb rgb)                // get alpha part of RGBA
-{ return ((rgb >> 24) & 0xff); }
+{ return rgb >> 24; }
 
 Q_GUI_EXPORT_INLINE QRgb qRgb(int r, int g, int b)// set RGB value
 { return (0xffu << 24) | ((r & 0xff) << 16) | ((g & 0xff) << 8) | (b & 0xff); }