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geometrictransform: make bulge "radius" customizable

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https://bugzilla.gnome.org/show_bug.cgi?id=625908
This commit is contained in:
Filippo Argiolas 2010-08-05 12:29:16 +02:00 committed by Sebastian Dröge
parent 27134c6e38
commit 1652a3ef57
1 changed files with 4 additions and 5 deletions
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9
gst/geometrictransform/gstbulge.c
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@ -95,16 +95,15 @@ bulge_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
norm_x = 2.0 * (x / width - cgt->x_center);
norm_y = 2.0 * (y / height - cgt->y_center);
r = sqrt (norm_x * norm_x + norm_y * norm_y);
/* calculate radius, normalize to 1 for future convenience */
r = sqrt (0.5 * (norm_x * norm_x + norm_y * norm_y));
/* maps r to r^2 in the step region */
/* interpolating from negative values limits the amount of zoom at
* the center so the first edge could be used as intensity
* parameter */
/* the second edge is the bulge radius, see gststretch.c for
* comments about its customizability */
norm_x *= smoothstep (-0.15, 0.6, r);
norm_y *= smoothstep (-0.15, 0.6, r);
norm_x *= smoothstep (-0.15, cgt->radius, r);
norm_y *= smoothstep (-0.15, cgt->radius, r);
/* unnormalize */
*in_x = (0.5 * norm_x + cgt->x_center) * width;