In ResampleEffect, precompute the Lanczos function into a table.

[movit] / util.cpp

diff --git a/util.cpp b/util.cpp
index da6057e52f13b4ad4af9ca82a4c83acab6d23388..59f1dcdd67529ef9b4fd54f959fdc49bdc41d633 100644 (file)
--- a/util.cpp
+++ b/util.cpp
@@ -253,11 +253,11 @@ void combine_two_samples(float w1, float w2, float pos1, float pos2, float num_s
        //   w = (a(1-z) + bz) / ((1-z)² + z²)
        //
        // If z had infinite precision, this would simply reduce to w = w1 + w2.
-       *total_weight = (w1 + z * (w2 - w1)) / (z * z + (1 - z) * (1 - z));
+       *total_weight = from_fp64<DestFloat>((w1 + z * (w2 - w1)) / (z * z + (1 - z) * (1 - z)));
 
        if (sum_sq_error != NULL) {
-               float err1 = *total_weight * (1 - z) - w1;
-               float err2 = *total_weight * z - w2;
+               float err1 = to_fp64(*total_weight) * (1 - z) - w1;
+               float err2 = to_fp64(*total_weight) * z - w2;
                *sum_sq_error = err1 * err1 + err2 * err2;
        }
 }