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geometrictransform: add an "intensity" parameter to stretch filter

Browse source 
https://bugzilla.gnome.org/show_bug.cgi?id=625908
This commit is contained in:
Filippo Argiolas 2010-08-05 16:16:37 +02:00 committed by Sebastian Dröge
parent 7be30c3daf
commit 58b76ac56c
2 changed files with 79 additions and 3 deletions
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80
gst/geometrictransform/gststretch.c
View file

@ -54,9 +54,63 @@
GST_DEBUG_CATEGORY_STATIC (gst_stretch_debug);
#define GST_CAT_DEFAULT gst_stretch_debug
enum
{
PROP_0,
PROP_INTENSITY
};
#define DEFAULT_INTENSITY 0.5
#define MAX_SHRINK_AMOUNT 3.0
GST_BOILERPLATE (GstStretch, gst_stretch, GstCircleGeometricTransform,
GST_TYPE_CIRCLE_GEOMETRIC_TRANSFORM);
static void
gst_stretch_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstStretch *stretch;
GstGeometricTransform *gt;
gdouble v;
gt = GST_GEOMETRIC_TRANSFORM_CAST (object);
stretch = GST_STRETCH_CAST (object);
GST_OBJECT_LOCK (gt);
switch (prop_id) {
case PROP_INTENSITY:
v = g_value_get_double (value);
if (v != stretch->intensity) {
stretch->intensity = v;
gst_geometric_transform_set_need_remap (gt);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (gt);
}
static void
gst_stretch_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstStretch *stretch;
stretch = GST_STRETCH_CAST (object);
switch (prop_id) {
case PROP_INTENSITY:
g_value_set_double (value, stretch->intensity);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/* Clean up */
static void
gst_stretch_finalize (GObject * obj)
@ -90,6 +144,7 @@ stretch_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
gdouble width = gt->width;
gdouble height = gt->height;
gdouble a, b;
/* normalize in ((-1.0, -1.0), (1.0, 1.0) and traslate the center */
norm_x = 2.0 * (x / width - cgt->x_center);
@ -102,9 +157,17 @@ stretch_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
* really does is shrink the center and gradually return to normal
* size while r increases. The shrink thing drags pixels giving
* stretching the image around the center */
/* 2.0 is the shrink amount. Make it customizable? */
norm_x *= 2.0 - smoothstep (0.0, cgt->radius, r);
norm_y *= 2.0 - smoothstep (0.0, cgt->radius, r);
/* a is the current maximum shrink amount, it goes from 1.0 to
* MAX_SHRINK_AMOUNT * intensity */
/* smoothstep goes from 0.0 when r == 0 to b when r == radius */
/* total shrink factor is MAX_SHRINK_AMOUNT at center and gradually
* decreases while r goes to radius */
a = 1.0 + (MAX_SHRINK_AMOUNT - 1.0) * stretch->intensity;
b = a - 1.0;
norm_x *= a - b * smoothstep (0.0, cgt->radius, r);
norm_y *= a - b * smoothstep (0.0, cgt->radius, r);
/* unnormalize */
*in_x = (0.5 * norm_x + cgt->x_center) * width;
@ -127,6 +190,16 @@ gst_stretch_class_init (GstStretchClass * klass)
parent_class = g_type_class_peek_parent (klass);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_stretch_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_stretch_get_property);
g_object_class_install_property (gobject_class, PROP_INTENSITY,
g_param_spec_double ("intensity", "intensity",
"Intensity of the stretch effect",
0.0, 1.0, DEFAULT_INTENSITY,
GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_stretch_finalize);
gstgt_class->map_func = stretch_map;
@ -137,6 +210,7 @@ gst_stretch_init (GstStretch * filter, GstStretchClass * gclass)
{
GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter);
filter->intensity = DEFAULT_INTENSITY;
gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP;
}

2
gst/geometrictransform/gststretch.h
View file

@ -67,6 +67,8 @@ typedef struct _GstStretchClass GstStretchClass;
struct _GstStretch
{
GstCircleGeometricTransform element;
gdouble intensity;
};
struct _GstStretchClass