/* 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 = filter->width;
  gint g_cube_bits = filter->g_cube_bits;
  gint g_cube_size = filter->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;

  /* it's not null if we got it, but it might not be ours */
  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;

  /* it's not null if we got it, but it might not be ours */
  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;
  }
}