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| author | Filippo Argiolas <filippo.argiolas@gmail.com> | 2010-08-02 09:17:03 +0200 |
|---|---|---|
| committer | Sebastian Dröge <sebastian.droege@collabora.co.uk> | 2010-08-02 20:09:26 +0200 |
| commit | 2edd185a9a3f03280d4184ddd5a81c20f52845f7 (patch) | |
| tree | b624030016eb61d8014c50cd1d75f188e128d553 /gst/geometrictransform/geometricmath.c | |
| parent | 8f47c060d759021425305235ae512be78759b8fd (diff) | |
| download | gstreamer-plugins-bad-2edd185a9a3f03280d4184ddd5a81c20f52845f7.tar.gz | |
geometrictransform: new filter "stretch"
Ports gleffects "stretch" filter to geometrictransform.
Shrinks the image around the center and gradually return to normal zoom
creating funny caricatures.
https://bugzilla.gnome.org/show_bug.cgi?id=625722
Diffstat (limited to 'gst/geometrictransform/geometricmath.c')
| -rw-r--r-- | gst/geometrictransform/geometricmath.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/gst/geometrictransform/geometricmath.c b/gst/geometrictransform/geometricmath.c index dbdfe97bf..3185e101d 100644 --- a/gst/geometrictransform/geometricmath.c +++ b/gst/geometrictransform/geometricmath.c @@ -189,3 +189,13 @@ geometric_math_triangle (gdouble x) return 2.0 * (r < 0.5 ? r : 1 - r); } + +/** + * Hermite interpolation + */ +gdouble +smoothstep (gdouble edge0, gdouble edge1, gdouble x) +{ + gdouble t = CLAMP ((x - edge0) / (edge1 - edge0), 0.0, 1.0); + return t * t * (3.0 - 2.0 * t); +} |