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geometrictransform: make square "width" and "height" customizable

Browse source 
https://bugzilla.gnome.org/show_bug.cgi?id=625908
This commit is contained in:
Filippo Argiolas 2010-08-09 16:55:43 +02:00 committed by Sebastian Dröge
parent 2a9b456dab
commit 4cec7d10cd
2 changed files with 91 additions and 2 deletions
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91
gst/geometrictransform/gstsquare.c
View file

@ -53,11 +53,78 @@
GST_DEBUG_CATEGORY_STATIC (gst_square_debug);
#define GST_CAT_DEFAULT gst_square_debug
enum
{
PROP_0,
PROP_WIDTH,
PROP_HEIGHT,
};
#define DEFAULT_WIDTH 0.5
#define DEFAULT_HEIGHT 0.5
GST_BOILERPLATE (GstSquare, gst_square, GstGeometricTransform,
GST_TYPE_GEOMETRIC_TRANSFORM);
/* GObject vmethod implementations */
static void
gst_square_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstSquare *square;
GstGeometricTransform *gt;
gdouble v;
gt = GST_GEOMETRIC_TRANSFORM_CAST (object);
square = GST_SQUARE_CAST (gt);
GST_OBJECT_LOCK (square);
switch (prop_id) {
case PROP_WIDTH:
v = g_value_get_double (value);
if (v != square->width) {
square->width = v;
gst_geometric_transform_set_need_remap (gt);
}
break;
case PROP_HEIGHT:
v = g_value_get_double (value);
if (v != square->height) {
square->height = v;
gst_geometric_transform_set_need_remap (gt);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (square);
}
static void
gst_square_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstSquare *square;
GstGeometricTransform *gt;
gt = GST_GEOMETRIC_TRANSFORM_CAST (object);
square = GST_SQUARE_CAST (gt);
switch (prop_id) {
case PROP_WIDTH:
g_value_set_double (value, square->width);
break;
case PROP_HEIGHT:
g_value_set_double (value, square->height);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_square_base_init (gpointer gclass)
{
@ -78,6 +145,7 @@ square_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
gdouble norm_x;
gdouble norm_y;
/* frame size */
gdouble width = gt->width;
gdouble height = gt->height;
@ -87,8 +155,12 @@ 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 (0.375, 0.625, ABS (norm_x)));
norm_y *= 0.5 * (1.0 + smoothstep (0.375, 0.625, ABS (norm_y)));
norm_x *=
0.5 * (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,
ABS (norm_y)));
/* unnormalize */
*in_x = 0.5 * (norm_x + 1.0) * width;
@ -110,6 +182,19 @@ gst_square_class_init (GstSquareClass * klass)
gstgt_class = (GstGeometricTransformClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_square_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_square_get_property);
g_object_class_install_property (gobject_class, PROP_WIDTH,
g_param_spec_double ("width", "Width",
"Width of the square, relative to the frame width",
0.0, 1.0, DEFAULT_WIDTH,
GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_HEIGHT,
g_param_spec_double ("height", "Height",
"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));
gstgt_class->map_func = square_map;
}
@ -119,6 +204,8 @@ gst_square_init (GstSquare * filter, GstSquareClass * gclass)
{
GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter);
filter->width = DEFAULT_WIDTH;
filter->height = DEFAULT_HEIGHT;
gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP;
}

2
gst/geometrictransform/gstsquare.h
View file

@ -68,6 +68,8 @@ typedef struct _GstSquareClass GstSquareClass;
struct _GstSquare
{
GstGeometricTransform element;
gdouble width, height;
};
struct _GstSquareClass