gstreamer/gst/effectv/gstdice.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* dice.c: a 'dicing' effect
* copyright (c) 2001 Sam Mertens. This code is subject to the provisions of
* the GNU Library Public License.
*
* I suppose this looks similar to PuzzleTV, but it's not. The screen is
* divided into small squares, each of which is rotated either 0, 90, 180 or
* 270 degrees. The amount of rotation for each square is chosen at random.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/gst.h>
#include <gstvideofilter.h>
#define GST_TYPE_DICETV \
(gst_dicetv_get_type())
#define GST_DICETV(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_DICETV,GstDiceTV))
#define GST_DICETV_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_DICETV,GstDiceTVClass))
#define GST_IS_DICETV(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_DICETV))
#define GST_IS_DICETV_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_DICETV))
typedef struct _GstDiceTV GstDiceTV;
typedef struct _GstDiceTVClass GstDiceTVClass;
#define DEFAULT_CUBE_BITS 4
#define MAX_CUBE_BITS 5
#define MIN_CUBE_BITS 0
typedef enum _dice_dir
{
DICE_UP = 0,
DICE_RIGHT = 1,
DICE_DOWN = 2,
DICE_LEFT = 3
}
DiceDir;
struct _GstDiceTV
{
GstVideofilter videofilter;
gint width, height;
gchar *dicemap;
gint g_cube_bits;
gint g_cube_size;
gint g_map_height;
gint g_map_width;
};
struct _GstDiceTVClass
{
GstVideofilterClass parent_class;
void (*reset) (GstElement * element);
};
/* Filter signals and args */
enum
{
/* FILL ME */
RESET_SIGNAL,
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_CUBE_BITS
};
static void gst_dicetv_base_init (gpointer g_class);
static void gst_dicetv_class_init (gpointer g_class, gpointer class_data);
static void gst_dicetv_init (GTypeInstance * instance, gpointer g_class);
static void gst_dicetv_reset_handler (GstElement * elem);
static void gst_dicetv_create_map (GstDiceTV * filter);
static void gst_dicetv_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_dicetv_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_dicetv_setup (GstVideofilter * videofilter);
static void gst_dicetv_draw (GstVideofilter * videofilter, void *d, void *s);
static guint gst_dicetv_signals[LAST_SIGNAL] = { 0 };
GType
gst_dicetv_get_type (void)
{
static GType dicetv_type = 0;
if (!dicetv_type) {
static const GTypeInfo dicetv_info = {
sizeof (GstDiceTVClass),
gst_dicetv_base_init,
NULL,
(GClassInitFunc) gst_dicetv_class_init,
NULL,
NULL,
sizeof (GstDiceTV),
0,
(GInstanceInitFunc) gst_dicetv_init,
};
dicetv_type =
g_type_register_static (GST_TYPE_VIDEOFILTER, "GstDiceTV", &dicetv_info,
0);
}
return dicetv_type;
}
static GstVideofilterFormat gst_dicetv_formats[] = {
{"RGB ", 32, gst_dicetv_draw, 24, G_BIG_ENDIAN, 0x00ff0000, 0x0000ff00,
0x000000ff},
{"RGB ", 32, gst_dicetv_draw, 24, G_BIG_ENDIAN, 0xff000000, 0x00ff0000,
0x0000ff00},
{"RGB ", 32, gst_dicetv_draw, 24, G_BIG_ENDIAN, 0x000000ff, 0x0000ff00,
0x00ff0000},
{"RGB ", 32, gst_dicetv_draw, 24, G_BIG_ENDIAN, 0x0000ff00, 0x00ff0000,
0xff000000},
};
static void
gst_dicetv_base_init (gpointer g_class)
{
/* elementfactory information */
static GstElementDetails gst_dicetv_details = GST_ELEMENT_DETAILS ("DiceTV",
"Filter/Effect/Video",
"'Dices' the screen up into many small squares",
"Wim Taymans <wim.taymans@chello.be>");
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
GstVideofilterClass *videofilter_class = GST_VIDEOFILTER_CLASS (g_class);
int i;
gst_element_class_set_details (element_class, &gst_dicetv_details);
for (i = 0; i < G_N_ELEMENTS (gst_dicetv_formats); i++) {
gst_videofilter_class_add_format (videofilter_class,
gst_dicetv_formats + i);
}
gst_videofilter_class_add_pad_templates (GST_VIDEOFILTER_CLASS (g_class));
}
static void
gst_dicetv_class_init (gpointer g_class, gpointer class_data)
{
GObjectClass *gobject_class;
GstVideofilterClass *videofilter_class;
GstDiceTVClass *dicetv_class;
gobject_class = G_OBJECT_CLASS (g_class);
videofilter_class = GST_VIDEOFILTER_CLASS (g_class);
dicetv_class = GST_DICETV_CLASS (g_class);
gst_dicetv_signals[RESET_SIGNAL] =
g_signal_new ("reset",
G_TYPE_FROM_CLASS (g_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstDiceTVClass, reset),
NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
dicetv_class->reset = gst_dicetv_reset_handler;
gobject_class->set_property = gst_dicetv_set_property;
gobject_class->get_property = gst_dicetv_get_property;
g_object_class_install_property (gobject_class, ARG_CUBE_BITS,
g_param_spec_int ("square_bits", "Square Bits", "The size of the Squares",
MIN_CUBE_BITS, MAX_CUBE_BITS, DEFAULT_CUBE_BITS, G_PARAM_READWRITE));
videofilter_class->setup = gst_dicetv_setup;
}
static void
gst_dicetv_setup (GstVideofilter * videofilter)
{
GstDiceTV *dicetv;
g_return_if_fail (GST_IS_DICETV (videofilter));
dicetv = GST_DICETV (videofilter);
dicetv->width = gst_videofilter_get_input_width (videofilter);
dicetv->height = gst_videofilter_get_input_height (videofilter);
g_free (dicetv->dicemap);
dicetv->dicemap =
(gchar *) g_malloc (dicetv->height * dicetv->width * sizeof (char));
gst_dicetv_create_map (dicetv);
}
static void
gst_dicetv_init (GTypeInstance * instance, gpointer g_class)
{
GstDiceTV *filter = GST_DICETV (instance);
filter->dicemap = NULL;
filter->g_cube_bits = DEFAULT_CUBE_BITS;
filter->g_cube_size = 0;
filter->g_map_height = 0;
filter->g_map_width = 0;
}
static void
gst_dicetv_reset_handler (GstElement * element)
{
GstDiceTV *filter = GST_DICETV (element);
gst_dicetv_create_map (filter);
}
static unsigned int
fastrand (void)
{
static unsigned int fastrand_val;
return (fastrand_val = fastrand_val * 1103515245 + 12345);
}
static void
gst_dicetv_draw (GstVideofilter * videofilter, void *d, void *s)
{
GstDiceTV *filter;
guint32 *src;
guint32 *dest;
gint i;
gint map_x, map_y, map_i;
gint base;
gint dx, dy, di;
gint video_width;
gint g_cube_bits;
gint g_cube_size;
filter = GST_DICETV (videofilter);
src = (guint32 *) s;
dest = (guint32 *) d;
video_width = filter->width;
g_cube_bits = filter->g_cube_bits;
g_cube_size = filter->g_cube_size;
map_i = 0;
for (map_y = 0; map_y < filter->g_map_height; map_y++) {
for (map_x = 0; map_x < filter->g_map_width; map_x++) {
base = (map_y << g_cube_bits) * video_width + (map_x << g_cube_bits);
switch (filter->dicemap[map_i]) {
case DICE_UP:
for (dy = 0; dy < g_cube_size; dy++) {
i = base + dy * video_width;
for (dx = 0; dx < g_cube_size; dx++) {
dest[i] = src[i];
i++;
}
}
break;
case DICE_LEFT:
for (dy = 0; dy < g_cube_size; dy++) {
i = base + dy * video_width;
for (dx = 0; dx < g_cube_size; dx++) {
di = base + (dx * video_width) + (g_cube_size - dy - 1);
dest[di] = src[i];
i++;
}
}
break;
case DICE_DOWN:
for (dy = 0; dy < g_cube_size; dy++) {
di = base + dy * video_width;
i = base + (g_cube_size - dy - 1) * video_width + g_cube_size;
for (dx = 0; dx < g_cube_size; dx++) {
i--;
dest[di] = src[i];
di++;
}
}
break;
case DICE_RIGHT:
for (dy = 0; dy < g_cube_size; dy++) {
i = base + (dy * video_width);
for (dx = 0; dx < g_cube_size; dx++) {
di = base + dy + (g_cube_size - dx - 1) * video_width;
dest[di] = src[i];
i++;
}
}
break;
default:
g_assert_not_reached ();
break;
}
map_i++;
}
}
}
static void
gst_dicetv_create_map (GstDiceTV * filter)
{
gint x, y, i;
filter->g_map_height = filter->height >> filter->g_cube_bits;
filter->g_map_width = filter->width >> filter->g_cube_bits;
filter->g_cube_size = 1 << filter->g_cube_bits;
i = 0;
for (y = 0; y < filter->g_map_height; y++) {
for (x = 0; x < filter->g_map_width; x++) {
// dicemap[i] = ((i + y) & 0x3); /* Up, Down, Left or Right */
filter->dicemap[i] = (fastrand () >> 24) & 0x03;
i++;
}
}
}
static void
gst_dicetv_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstDiceTV *filter;
g_return_if_fail (GST_IS_DICETV (object));
filter = GST_DICETV (object);
switch (prop_id) {
case ARG_CUBE_BITS:
filter->g_cube_bits = g_value_get_int (value);
gst_dicetv_create_map (filter);
default:
break;
}
}
static void
gst_dicetv_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstDiceTV *filter;
g_return_if_fail (GST_IS_DICETV (object));
filter = GST_DICETV (object);
switch (prop_id) {
case ARG_CUBE_BITS:
g_value_set_int (value, filter->g_cube_bits);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}