shithub: fnt

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raster: don't compute coefficients from K and L if they are all zero

--- a/rast.c

+++ b/rast.c

@@ -299,11 +299,12 @@

 		else

 			f = qKL;

+		z = 0;

 		if(tx₀ == 0){

-			f(s, jj, px+0, py+0, K[0], L[0]);

-			f(s, jj, px+0, py+1, K[1], L[1]);

-			f(s, jj, px+1, py+0, K[2], L[2]);

-			f(s, jj, px+1, py+1, K[3], L[3]);

+			z |= f(s, jj, px+0, py+0, K[0], L[0]);

+			z |= f(s, jj, px+0, py+1, K[1], L[1]);

+			z |= f(s, jj, px+1, py+0, K[2], L[2]);

+			z |= f(s, jj, px+1, py+1, K[3], L[3]);

 		}else{

 			z = 0;

 			if(f(s, jj, px+0, py+0, K[0], L[0]))

@@ -318,9 +319,11 @@

 			all |= z;

 		}

-		c[0] += L[0][1] + L[2][1] + K[1][1] - L[1][1] + K[3][1] - L[3][1];

-		c[1] += L[0][0] + L[1][0] + K[2][0] - L[2][0] + K[3][0] - L[3][0];

-		c[2] += L[0][0] - L[1][0] + K[2][0] - L[2][0] - K[3][0] + L[3][0];

+		if(z != 0){

+			c[0] += L[0][1] + L[2][1] + K[1][1] - L[1][1] + K[3][1] - L[3][1];

+			c[1] += L[0][0] + L[1][0] + K[2][0] - L[2][0] + K[3][0] - L[3][0];

+			c[2] += L[0][0] - L[1][0] + K[2][0] - L[2][0] - K[3][0] + L[3][0];

+		}

 	}

 	return all;

 }