diff options
Diffstat (limited to 'source/blender/blenkernel/BKE_colortools.h')
| -rw-r--r-- | source/blender/blenkernel/BKE_colortools.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/source/blender/blenkernel/BKE_colortools.h b/source/blender/blenkernel/BKE_colortools.h index 0d4560207ea..d52fd91ccdd 100644 --- a/source/blender/blenkernel/BKE_colortools.h +++ b/source/blender/blenkernel/BKE_colortools.h @@ -129,6 +129,36 @@ bool BKE_curvemapping_RGBA_does_something(const struct CurveMapping *cumap); void BKE_curvemapping_table_F(const struct CurveMapping *cumap, float **array, int *size); void BKE_curvemapping_table_RGBA(const struct CurveMapping *cumap, float **array, int *size); +/** Get the minimum x value of each curve map table. */ +void BKE_curvemapping_get_range_minimums(const struct CurveMapping *curve_mapping, + float minimums[4]); + +/** Get the reciprocal of the difference between the maximum and the minimum x value of each curve + * map table. Evaluation parameters can be multiplied by this value to be normalized. If the + * difference is zero, 1^8 is returned. */ +void BKE_curvemapping_compute_range_dividers(const struct CurveMapping *curve_mapping, + float dividers[4]); + +/** Compute the slopes at the start and end points of each curve map. The slopes are multiplied by + * the range of the curve map to compensate for parameter normalization. If the slope is vertical, + * 1^8 is returned. */ +void BKE_curvemapping_compute_slopes(const struct CurveMapping *curve_mapping, + float start_slopes[4], + float end_slopes[4]); + +/** Check if the curve map at the index is identity, that is, does nothing. A curve map is said to + * be identity if: + * - The curve mapping uses extrapolation. + * - Its range is 1. + * - The slope at its start point is 1. + * - The slope at its end point is 1. + * - The number of points is 2. + * - The start point is at (0, 0). + * - The end point is at (1, 1). + * Note that this could return false even if the curve map is identity, this happens in the case + * when more than 2 points exist in the curve map but all points are collinear. */ +bool BKE_curvemapping_is_map_identity(const struct CurveMapping *curve_mapping, int index); + /** * Call when you do images etc, needs restore too. also verifies tables. * non-const (these modify the curve). |