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pinch: Some optimization using the prepare func

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Small optimization by precalculating the center of the effect,
also use newly added _CAST macro.
This commit is contained in:
Thiago Santos 2010-05-30 12:50:56 -03:00
parent 8c5360a559
commit dcda4b606c
2 changed files with 30 additions and 19 deletions
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44
gst/geometrictransform/gstpinch.c
View file

@ -83,7 +83,7 @@ gst_pinch_set_property (GObject * object, guint prop_id, const GValue * value,
{
GstPinch *pinch;
pinch = GST_PINCH (object);
pinch = GST_PINCH_CAST (object);
switch (prop_id) {
case PROP_X_CENTER:
@ -110,7 +110,7 @@ gst_pinch_get_property (GObject * object, guint prop_id,
{
GstPinch *pinch;
pinch = GST_PINCH (object);
pinch = GST_PINCH_CAST (object);
switch (prop_id) {
case PROP_X_CENTER:
@ -152,31 +152,35 @@ gst_pinch_base_init (gpointer gclass)
"Thiago Santos<thiago.sousa.santos@collabora.co.uk>");
}
/* FIXME optimize a little using cast macro and pre calculating some
* values so we don't need them every mapping */
static gboolean
dummy_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
pinch_precalc (GstGeometricTransform * gt)
{
GstPinch *pinch = GST_PINCH_CAST (gt);
pinch->precalc_x_center = pinch->x_center * gt->width;
pinch->precalc_y_center = pinch->y_center * gt->height;
return TRUE;
}
static gboolean
pinch_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
gdouble * in_y)
{
GstPinch *pinch = GST_PINCH (gt);
GstPinch *pinch = GST_PINCH_CAST (gt);
gdouble r2;
gdouble distance;
gdouble x_center;
gdouble y_center;
gdouble dx, dy;
/* get the center in pixels instead of % */
x_center = pinch->x_center * gt->width;
y_center = pinch->y_center * gt->height;
dx = x - x_center;
dy = y - y_center;
dx = x - pinch->precalc_x_center;
dy = y - pinch->precalc_y_center;
distance = dx * dx + dy * dy;
r2 = pinch->radius * pinch->radius;
GST_LOG_OBJECT (pinch, "Center %0.5lf (%0.2lf) %0.5lf (%0.2lf)",
x_center, pinch->x_center, y_center, pinch->y_center);
pinch->precalc_x_center, pinch->x_center, pinch->precalc_y_center,
pinch->y_center);
GST_LOG_OBJECT (pinch, "Input %d %d, distance=%lf, radius2=%lf, dx=%lf"
", dy=%lf", x, y, distance, r2, dx, dy);
@ -192,8 +196,8 @@ dummy_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
GST_LOG_OBJECT (pinch, "D=%lf, t=%lf, dx=%lf" ", dy=%lf", d, t, dx, dy);
*in_x = x_center + dx;
*in_y = y_center + dy;
*in_x = pinch->precalc_x_center + dx;
*in_y = pinch->precalc_y_center + dy;
*in_x = CLAMP (*in_x, 0, gt->width - 1);
*in_y = CLAMP (*in_y, 0, gt->height - 1);
@ -222,7 +226,8 @@ gst_pinch_class_init (GstPinchClass * klass)
/* FIXME I don't like the idea of x-center and y-center being in % and
* radius and intensity in absolute values, I think no one likes it. */
* radius and intensity in absolute values, I think no one likes it, but
* I can't see a way to have nice default values without % */
g_object_class_install_property (gobject_class, PROP_X_CENTER,
g_param_spec_double ("x-center", "x center",
"X axis center of the pinch effect",
@ -243,7 +248,8 @@ gst_pinch_class_init (GstPinchClass * klass)
0.0, G_MAXDOUBLE, DEFAULT_INTENSITY,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstgt_class->map_func = dummy_map;
gstgt_class->map_func = pinch_map;
gstgt_class->prepare_func = pinch_precalc;
}
static void

5
gst/geometrictransform/gstpinch.h
View file

@ -54,6 +54,8 @@ G_BEGIN_DECLS
(gst_pinch_get_type())
#define GST_PINCH(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_PINCH,GstPinch))
#define GST_PINCH_CAST(obj) \
((GstPinch *)(obj))
#define GST_PINCH_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_PINCH,GstPinchClass))
#define GST_IS_PINCH(obj) \
@ -72,6 +74,9 @@ struct _GstPinch
gdouble y_center;
gdouble radius;
gdouble intensity;
gdouble precalc_x_center;
gdouble precalc_y_center;
};
struct _GstPinchClass