diff options
Diffstat (limited to 'third_party/skcms/src/Curve.c')
| -rw-r--r-- | third_party/skcms/src/Curve.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/third_party/skcms/src/Curve.c b/third_party/skcms/src/Curve.c index 1e48d65799..f52eb983fe 100644 --- a/third_party/skcms/src/Curve.c +++ b/third_party/skcms/src/Curve.c @@ -6,7 +6,9 @@ */ #include "Curve.h" +#include "PortableMath.h" #include "TransferFunction.h" +#include <assert.h> float skcms_eval_curve(const skcms_Curve* curve, float x) { if (curve->table_entries == 0) { @@ -15,7 +17,10 @@ float skcms_eval_curve(const skcms_Curve* curve, float x) { // TODO: today we should always hit an entry exactly, but if that changes, lerp? // (We add half to account for slight int -> float -> int round tripping issues.) - int ix = (int)( x*(curve->table_entries - 1) + 0.5f ); + float fx = x*(curve->table_entries - 1); + int ix = (int)( fx + 0.5f ); + + assert ( fabsf_(fx - (float)ix) < 0.0005 ); if (curve->table_8) { return curve->table_8[ix] * (1/255.0f); |