When using transparency, don't compute new value when pixel is already fully opaque

This makes the code slightly more efficient, and should not affect the generated map at all.
2015-06-07 21:30:45 +02:00 · 2015-06-07 21:30:45 +02:00 · 673e8c6723
parent 4e6ee97936
commit 673e8c6723
1 changed files with 2 additions and 0 deletions
--- a/PixelAttributes.cpp
+++ b/PixelAttributes.cpp
@ -259,6 +259,8 @@ void PixelAttribute::mixUnder(const PixelAttribute &p)
 		}
 		m_h = p.m_h;
 	}
+	else if (m_a == 1)
+		;		// Nothing to do: pixel is already fully opaque.
 	else if ((m_mixMode & AlphaMixCumulative) == AlphaMixCumulative || (m_mixMode == AlphaMixAverage && p.m_a == 1)) {
 		PixelAttribute pp(p);
 #ifdef DEBUG