Changeset 2618 for libpipi/trunk/pipi/filter/blur.c

Timestamp:

08/01/08 00:02:26 (5 years ago)

Author:

sam

Message:

• filter/blur.c: minor optimisation in the kernel generation.

File:

• libpipi/trunk/pipi/filter/blur.c (modified) (3 diffs)

libpipi/trunk/pipi/filter/blur.c

@@ -40 +40 @@
     float *srcdata, *dstdata;
     double *kernel, *buffer;
-    double K, L;
+    double K;
     int x, y, i, w, h, kr, kw;
 
@@ -57 +57 @@
     kr = (int)(3. * rx + 0.99999);
     kw = 2 * kr + 1;
-    K = 1. / (sqrt(2. * M_PI) * rx);
-    L = -1. / (2. * rx * rx);
+    K = -1. / (2. * rx * rx);
 
     kernel = malloc(kw * sizeof(double));
     for(i = -kr; i <= kr; i++)
-        kernel[i + kr] = exp(L * ((double)i - dx) * ((double)i - dx)) * K;
+        kernel[i + kr] = exp(K * ((double)i - dx) * ((double)i - dx));
 
     for(y = 0; y < h; y++)
@@ -95 +94 @@
     kr = (int)(3. * ry + 0.99999);
     kw = 2 * kr + 1;
-    K = 1. / (sqrt(2. * M_PI) * ry);
-    L = -1. / (2. * ry * ry);
+    K = -1. / (2. * ry * ry);
 
     kernel = malloc(kw * sizeof(double));
     for(i = -kr; i <= kr; i++)
-        kernel[i + kr] = exp(L * ((double)i - dy) * ((double)i - dy)) * K;
+        kernel[i + kr] = exp(K * ((double)i - dy) * ((double)i - dy));
 
     for(y = 0; y < h; y++)