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geometrictransform: add a "zoom" parameter to square filter

Browse source 
https://bugzilla.gnome.org/show_bug.cgi?id=625908
This commit is contained in:
Filippo Argiolas 2010-08-09 17:20:11 +02:00 committed by Sebastian Dröge
parent 4cec7d10cd
commit fd4a629825
2 changed files with 23 additions and 2 deletions
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24
gst/geometrictransform/gstsquare.c
View file

@ -58,10 +58,12 @@ enum
PROP_0,
PROP_WIDTH,
PROP_HEIGHT,
PROP_ZOOM
};
#define DEFAULT_WIDTH 0.5
#define DEFAULT_HEIGHT 0.5
#define DEFAULT_ZOOM 2.0
GST_BOILERPLATE (GstSquare, gst_square, GstGeometricTransform,
GST_TYPE_GEOMETRIC_TRANSFORM);
@ -95,6 +97,13 @@ gst_square_set_property (GObject * object, guint prop_id,
gst_geometric_transform_set_need_remap (gt);
}
break;
case PROP_ZOOM:
v = g_value_get_double (value);
if (v != square->zoom) {
square->zoom = v;
gst_geometric_transform_set_need_remap (gt);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -119,6 +128,9 @@ gst_square_get_property (GObject * object, guint prop_id,
case PROP_HEIGHT:
g_value_set_double (value, square->height);
break;
case PROP_ZOOM:
g_value_set_double (value, square->zoom);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -156,10 +168,12 @@ square_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
/* transform */
/* zoom at the center, smoothstep around half quadrant and get back to normal */
norm_x *=
0.5 * (1.0 + smoothstep (square->width - 0.125, square->width + 0.125,
(1.0 / square->zoom) * (1.0 + (square->zoom -
1.0) * smoothstep (square->width - 0.125, square->width + 0.125,
ABS (norm_x)));
norm_y *=
0.5 * (1.0 + smoothstep (square->height - 0.125, square->height + 0.125,
(1.0 / square->zoom) * (1.0 + (square->zoom -
1.0) * smoothstep (square->height - 0.125, square->height + 0.125,
ABS (norm_y)));
/* unnormalize */
@ -195,6 +209,11 @@ gst_square_class_init (GstSquareClass * klass)
"Height of the square, relative to the frame height",
0.0, 1.0, DEFAULT_HEIGHT,
GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_ZOOM,
g_param_spec_double ("zoom", "Zoom",
"Zoom amount in the center region",
1.0, 100.0, DEFAULT_ZOOM,
GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstgt_class->map_func = square_map;
}
@ -206,6 +225,7 @@ gst_square_init (GstSquare * filter, GstSquareClass * gclass)
filter->width = DEFAULT_WIDTH;
filter->height = DEFAULT_HEIGHT;
filter->zoom = DEFAULT_ZOOM;
gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP;
}

1
gst/geometrictransform/gstsquare.h
View file

@ -70,6 +70,7 @@ struct _GstSquare
GstGeometricTransform element;
gdouble width, height;
gdouble zoom;
};
struct _GstSquareClass