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geometrictransform: make tunnel "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 12:43:15 +02:00 committed by Sebastian Dröge
parent 1652a3ef57
commit 7be30c3daf
1 changed files with 5 additions and 6 deletions
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11
gst/geometrictransform/gsttunnel.c
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@ -96,14 +96,13 @@ tunnel_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
norm_x = 2.0 * (x - cgt->x_center * width) / MAX (width, height);
norm_y = 2.0 * (y - cgt->y_center * height) / MAX (width, height);
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));
/* do nothing if r < 0.5 */
/* do nothing if r < radius */
/* zoom otherwise */
/* the second edge is the tunnel radius, see gststretch.c for
* comments about its customizability */
norm_x *= CLAMP (r, 0.0, 0.5) / r;
norm_y *= CLAMP (r, 0.0, 0.5) / r;
norm_x *= CLAMP (r, 0.0, cgt->radius) / r;
norm_y *= CLAMP (r, 0.0, cgt->radius) / r;
/* unnormalize */
*in_x = 0.5 * (norm_x) * MAX (width, height) + cgt->x_center * width;