Merge "Fix comments in gaussian blur"
diff --git a/cpu_ref/rsCpuIntrinsicBlur.cpp b/cpu_ref/rsCpuIntrinsicBlur.cpp
index 91302ed..4e2ee96 100644
--- a/cpu_ref/rsCpuIntrinsicBlur.cpp
+++ b/cpu_ref/rsCpuIntrinsicBlur.cpp
@@ -63,12 +63,13 @@
// Compute gaussian weights for the blur
// e is the euler's number
+ // TODO Define these constants only once
float e = 2.718281828459045f;
float pi = 3.1415926535897932f;
- // g(x) = ( 1 / sqrt( 2 * pi ) * sigma) * e ^ ( -x^2 / 2 * sigma^2 )
+ // g(x) = (1 / (sqrt(2 * pi) * sigma)) * e ^ (-x^2 / (2 * sigma^2))
// x is of the form [-radius .. 0 .. radius]
- // and sigma varies with radius.
- // Based on some experimental radius values and sigma's
+ // and sigma varies with the radius.
+ // Based on some experimental radius values and sigmas,
// we approximately fit sigma = f(radius) as
// sigma = radius * 0.4 + 0.6
// The larger the radius gets, the more our gaussian blur
@@ -91,7 +92,7 @@
normalizeFactor += mFp[r + mIradius];
}
- //Now we need to normalize the weights because all our coefficients need to add up to one
+ // Now we need to normalize the weights because all our coefficients need to add up to one
normalizeFactor = 1.0f / normalizeFactor;
for (r = -mIradius; r <= mIradius; r ++) {
mFp[r + mIradius] *= normalizeFactor;