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Fix T42344: EWA filter produces blured results 

Derivatives variable names are swapped in the old EWA filter code,
need to adjust for that.

TODO: Make naming fore clear in there.
This commit is contained in:
Sergey Sharybin 2014-10-31 12:35:20 +01:00
parent fcc2ca0089
commit 7bb910cd4e
Notes: blender-bot 2023-02-14 09:55:19 +01:00 
Referenced by issue #42344, blurred BI-render, 2.72a regression?
1 changed files with 1 additions and 1 deletions
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source/blender/blenlib/intern/math_interp.c
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@ -467,7 +467,7 @@ void BLI_ewa_filter(const int width, const int height,
/* scaling dxt/dyt by full resolution can cause overflow because of huge A/B/C and esp. F values,
* scaling by aspect ratio alone does the opposite, so try something in between instead... */
const float ff2 = (float)width, ff = sqrtf(ff2), q = (float)height / ff;
const float Ux = du[0] * ff, Vx = dv[0] * q, Uy = du[1] * ff, Vy = dv[1] * q;
const float Ux = du[0] * ff, Vx = du[1] * q, Uy = dv[0] * ff, Vy = dv[1] * q;
float A = Vx * Vx + Vy * Vy;
float B = -2.0f * (Ux * Vx + Uy * Vy);
float C = Ux * Ux + Uy * Uy;