diff options
Diffstat (limited to 'third_party/skcms/src/PolyTF.c')
| -rw-r--r-- | third_party/skcms/src/PolyTF.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/third_party/skcms/src/PolyTF.c b/third_party/skcms/src/PolyTF.c index ff93ec5586..f74cf5418d 100644 --- a/third_party/skcms/src/PolyTF.c +++ b/third_party/skcms/src/PolyTF.c @@ -76,6 +76,7 @@ static bool fit_poly_tf(const skcms_Curve* curve, skcms_PolyTF* tf) { const int N = curve->table_entries == 0 ? 256 : (int)curve->table_entries; + const float dx = 1.0f / (N-1); // We'll test the quality of our fit by roundtripping through a skcms_TransferFunction, // either the inverse of the curve itself if it is parametric, or of its approximation if not. @@ -117,7 +118,8 @@ static bool fit_poly_tf(const skcms_Curve* curve, skcms_PolyTF* tf) { // Number of points already fit in the linear section. // If the curve isn't parametric and we approximated instead, this should be exact. - const int L = (int)(tf->D * (N-1)) + 1; + // const int L = (int)( tf->D/dx + 0.5f ) + 1 + const int L = (int)(tf->D * (N-1) + 0.5f) + 1; if (L == N-1) { // All points but one fit the linear section. @@ -136,7 +138,7 @@ static bool fit_poly_tf(const skcms_Curve* curve, skcms_PolyTF* tf) { rg_poly_tf_arg arg = { curve, tf }; if (!skcms_gauss_newton_step(rg_poly_tf, &arg, P, - tf->D, 1, N-L)) { + L*dx, dx, N-L)) { return false; } } |