diff -r c0155353733c -r 76efc8f9f7b4 graphicscomposition/openwfcompositionengine/common/include/owfimage.h
--- a/graphicscomposition/openwfcompositionengine/common/include/owfimage.h	Fri Apr 02 11:19:42 2010 +0100
+++ b/graphicscomposition/openwfcompositionengine/common/include/owfimage.h	Tue Apr 20 16:24:43 2010 +0100
@@ -66,6 +66,7 @@
 #define OWF_BLEND_ROUNDING_VALUE 0.0f
 #define OWF_PREMUL_ROUNDING_FACTOR  0.0f
 #define OWF_SOURCE_CONVERSION_ROUNDING_VALUE 0.0f
+#define OWF_ALPHA_MIN_STEP_VALUE (1.0f/256.0f)
 
 #else
 #undef OWF_IMAGE_INTERNAL_PIXEL_IS_FLOAT
@@ -89,6 +90,7 @@
 #define OWF_SOURCE_CONVERSION_ROUNDING_VALUE 0.5f
 #define OWF_BLEND_ROUNDING_VALUE (OWF_ALPHA_MAX_VALUE/2)
 #define OWF_PREMUL_ROUNDING_FACTOR (OWF_ALPHA_MAX_VALUE/2)
+#define OWF_ALPHA_MIN_STEP_VALUE 1
 
 #endif