mutter/clutter/clutter-texture.c

/*
 * Clutter.
 *
 * An OpenGL based 'interactive canvas' library.
 *
 * Authored By Matthew Allum  <mallum@openedhand.com>
 *
 * Copyright (C) 2006 OpenedHand
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/**
 * SECTION:clutter-texture
 * @short_description: An actor for displaying and manipulating images.
 *
 * #ClutterTexture is a base class for displaying and manipulating pixel
 * buffer type data.
 *
 * The clutter_texture_set_from_rgb_data() and clutter_texture_set_pixbuf()
 * functions are used to copy image data into texture memory and subsequently
 * realize the the texture. 
 *
 * If texture reads are supported by underlying GL implementation,
 * unrealizing/hiding frees image data from texture memory moving to main 
 * system memory. Re-realizing then performs the opposite operation. 
 * This process allows basic management of commonly limited available texture 
 * memory.  
 */

#include "config.h"

#include "clutter-texture.h"
#include "clutter-main.h"
#include "clutter-marshal.h"
#include "clutter-feature.h"
#include "clutter-util.h"
#include "clutter-private.h"
#include "clutter-debug.h"
#include "clutter-fixed.h"

#include "cogl.h"

G_DEFINE_TYPE (ClutterTexture, clutter_texture, CLUTTER_TYPE_ACTOR);

#if G_BYTE_ORDER == G_LITTLE_ENDIAN
#define PIXEL_TYPE CGL_UNSIGNED_BYTE
#else
#define PIXEL_TYPE CGL_UNSIGNED_INT_8_8_8_8_REV
#endif

typedef struct {
  gint pos;
  gint size;
  gint waste;
} ClutterTextureTileDimension;

#define CLUTTER_TEXTURE_GET_PRIVATE(obj)        (G_TYPE_INSTANCE_GET_PRIVATE ((obj), CLUTTER_TYPE_TEXTURE, ClutterTexturePrivate))

struct _ClutterTexturePrivate
{
  gint                         width;
  gint                         height;
  COGLenum                     pixel_format;
  COGLenum                     pixel_type;
  COGLenum                     target_type; 
  GdkPixbuf                   *local_pixbuf; /* non video memory copy */
  guint                        sync_actor_size : 1;
  gint                         max_tile_waste;
  guint                        filter_quality;
  guint                        repeat_x : 1; /* non working */
  guint                        repeat_y : 1; /* non working */
  guint                        is_tiled : 1;
  ClutterTextureTileDimension *x_tiles;
  ClutterTextureTileDimension *y_tiles;
  gint                         n_x_tiles;
  gint                         n_y_tiles;
  guint                       *tiles;
};

enum
{
  PROP_0,
  PROP_PIXBUF,
  PROP_USE_TILES,
  PROP_MAX_TILE_WASTE,
  PROP_PIXEL_TYPE, 		/* Texture type */
  PROP_PIXEL_FORMAT,		/* Texture format */
  PROP_SYNC_SIZE,
  PROP_REPEAT_Y,
  PROP_REPEAT_X,
  PROP_FILTER_QUALITY
};

enum
{
  SIZE_CHANGE,
  PIXBUF_CHANGE,
  LAST_SIGNAL
};

static int texture_signals[LAST_SIGNAL] = { 0 };

GQuark
clutter_texture_error_quark (void)
{
  return g_quark_from_static_string ("clutter-texture-error-quark");
}

static guchar*
un_pre_multiply_alpha (const guchar   *data,
		       gint            width,
		       gint            height,
		       gint            rowstride)
{
  gint           x,y;
  unsigned char *ret, *dst, *src;

  ret = dst = g_malloc(sizeof(guchar) * height * rowstride);

  /* FIXME: Optimise */
  for (y = 0; y < height; y++)
    {
      src = (guchar*)data + y * rowstride;
      for (x = 0; x < width; x++) 
	{
	  guchar alpha = src[3];
	  if (alpha == 0)
	    {
	      src[0] = src[1] = src[2] = src[3] = alpha;
	    }
	  else
	    {
	      dst[0] = (((src[0] >> 16) & 0xff) * 255 ) / alpha;
	      dst[1] = (((src[1] >> 8) & 0xff) * 255 ) / alpha; 
	      dst[2] = (((src[2] >> 0) & 0xff) * 255 ) / alpha;
	      dst[3] = alpha;
	    }
	  dst += 4;
	  src += 4;
	}
    }

  return ret;
}

#ifndef HAVE_COGL_GL
static guchar *
rgb_to_bgr (const guchar   *data,
	    gboolean        has_alpha,
	    gint            width,
	    gint            height,
	    gint            rowstride)
{
  gint           x,y, bpp = 4;
  unsigned char *ret, *dst, *src;

  ret = dst = g_malloc(sizeof(guchar) * height * rowstride);

  if (!has_alpha)
    bpp = 3;

  /* FIXME: Optimise */
  for (y = 0; y < height; y++)
    {
      src = (guchar*)data + y * rowstride;
      for (x = 0; x < width; x++) 
	{
	  dst[0] = src[2];
	  dst[1] = src[1];
	  dst[2] = src[0];
	  if (has_alpha)
	    dst[3] = src[3];
	  dst += bpp;
	  src += bpp;
	}
    }

  return ret;
}
#endif /* !HAVE_COGL_GL */

static int
tile_dimension (int                          to_fill,
		int                          start_size,
		int                          waste,
		ClutterTextureTileDimension *tiles)
{
  int pos     = 0;
  int n_tiles = 0;
  int size    = start_size;

  while (TRUE)
    {
      if (tiles)
	{
	  tiles[n_tiles].pos = pos;
	  tiles[n_tiles].size = size;
	  tiles[n_tiles].waste = 0;
	}

      n_tiles++;
	
      if (to_fill <= size)
	{
	  if (tiles)
	    tiles[n_tiles-1].waste = size - to_fill;
	  break;
	}
      else
	{
	  to_fill -= size; pos += size;
	  while (size >= 2 * to_fill || size - to_fill > waste)
	    size /= 2;
	}
    }

  return n_tiles;
}

static void
texture_init_tiles (ClutterTexture *texture)
{
  ClutterTexturePrivate *priv;
  gint                   x_pot, y_pot;

  priv = texture->priv;

  x_pot = clutter_util_next_p2 (priv->width);
  y_pot = clutter_util_next_p2 (priv->height);

  while (!(cogl_texture_can_size (CGL_TEXTURE_2D,
				  priv->pixel_format, 
				  priv->pixel_type,
				  x_pot, y_pot)
	   && (x_pot - priv->width < priv->max_tile_waste) 
	   && (y_pot - priv->height < priv->max_tile_waste)))
    {
      CLUTTER_NOTE (TEXTURE, "x_pot:%i - width:%i < max_waste:%i",
		    x_pot,
		    priv->width,
		    priv->max_tile_waste);
      
      CLUTTER_NOTE (TEXTURE, "y_pot:%i - height:%i < max_waste:%i",
		    y_pot,
		    priv->height,
		    priv->max_tile_waste);
      
      if (x_pot > y_pot)
	x_pot /= 2;
      else
	y_pot /= 2;

      g_return_if_fail (x_pot != 0 || y_pot != 0);
    }
  
  if (priv->x_tiles)
    g_free (priv->x_tiles);

  priv->n_x_tiles = tile_dimension (priv->width, x_pot, 
				    priv->max_tile_waste, NULL);
  priv->x_tiles = g_new (ClutterTextureTileDimension, priv->n_x_tiles);
  tile_dimension (priv->width, x_pot, priv->max_tile_waste, priv->x_tiles);

  if (priv->y_tiles)
    g_free (priv->y_tiles);

  priv->n_y_tiles = tile_dimension (priv->height, y_pot, 
				    priv->max_tile_waste, NULL);
  priv->y_tiles = g_new (ClutterTextureTileDimension, priv->n_y_tiles);
  tile_dimension (priv->height, y_pot, priv->max_tile_waste, priv->y_tiles);

  CLUTTER_NOTE (TEXTURE,
                "x_pot:%i, width:%i, y_pot:%i, height: %i "
		"max_waste:%i, n_x_tiles: %i, n_y_tiles: %i",
		x_pot, priv->width, y_pot, priv->height,
		priv->max_tile_waste,
		priv->n_x_tiles, priv->n_y_tiles);

}

static void
texture_render_to_gl_quad (ClutterTexture *texture, 
			   int             x_1, 
			   int             y_1, 
			   int             x_2, 
			   int             y_2)
{
  int   qx1 = 0, qx2 = 0, qy1 = 0, qy2 = 0;
  int   qwidth = 0, qheight = 0;
  int   x, y, i =0, lastx = 0, lasty = 0;
  float tx, ty;

  ClutterTexturePrivate *priv;

  priv = texture->priv;

  qwidth  = x_2 - x_1;
  qheight = y_2 - y_1;

  if (!priv->is_tiled)
    {
      cogl_texture_bind (priv->target_type, priv->tiles[0]);

      if (priv->target_type == CGL_TEXTURE_2D) /* POT */
	{
	  tx = (float) priv->width / clutter_util_next_p2 (priv->width);  
	  ty = (float) priv->height / clutter_util_next_p2 (priv->height);
	}
      else
	{
	  tx = (float) priv->width;
	  ty = (float) priv->height;

	}

      qx1 = x_1; qx2 = x_2;
      qy1 = y_1; qy2 = y_2;

      cogl_texture_quad (x_1, x_2, y_1, y_2, 
			 0,
			 0,
			 CLUTTER_FLOAT_TO_FIXED (tx),
			 CLUTTER_FLOAT_TO_FIXED (ty));
      
      return;
    }

  for (x = 0; x < priv->n_x_tiles; x++)
    {
      lasty = 0;

      for (y=0; y < priv->n_y_tiles; y++)
	{
	  int actual_w, actual_h;

	  cogl_texture_bind (priv->target_type, priv->tiles[i]);
	 
	  actual_w = priv->x_tiles[x].size - priv->x_tiles[x].waste;
	  actual_h = priv->y_tiles[y].size - priv->y_tiles[y].waste;

	  CLUTTER_NOTE (TEXTURE,
                        "rendering text tile x: %i, y: %i - %ix%i",
			x, y, actual_w, actual_h);

	  tx = (float) actual_w / priv->x_tiles[x].size;
	  ty = (float) actual_h / priv->y_tiles[y].size;

	  qx1 = x_1 + lastx;
	  qx2 = qx1 + ((qwidth * actual_w ) / priv->width );
	  
	  qy1 = y_1 + lasty;
	  qy2 = qy1 + ((qheight * actual_h) / priv->height );

	  cogl_texture_quad (qx1, qx2, qy1, qy2, 
			     0,
			     0,
			     CLUTTER_FLOAT_TO_FIXED (tx),
			     CLUTTER_FLOAT_TO_FIXED (ty));

	  lasty += (qy2 - qy1) ;	  

	  i++;
	}
      lastx += (qx2 - qx1);
    }
}

static void
texture_free_gl_resources (ClutterTexture *texture)
{
  ClutterTexturePrivate *priv;

  priv = texture->priv;

  CLUTTER_MARK();

  if (priv->tiles)
    {
      if (!priv->is_tiled)
	cogl_textures_destroy (1, priv->tiles);
      else
	cogl_textures_destroy (priv->n_x_tiles * priv->n_y_tiles, priv->tiles);

      g_free (priv->tiles);
      priv->tiles = NULL;
    }

  if (priv->x_tiles)
    {
      g_free (priv->x_tiles);
      priv->x_tiles = NULL;
    }

  if (priv->y_tiles)
    {
      g_free (priv->y_tiles);
      priv->y_tiles = NULL;
    }
}

static void
texture_upload_data (ClutterTexture *texture,
		     const guchar   *data,
		     gboolean        has_alpha,
		     gint            width,
		     gint            height,
		     gint            rowstride,
		     gint            bpp)
{
  ClutterTexturePrivate *priv;
  gint x, y;
  gint i = 0;
  gboolean create_textures = FALSE;
  GdkPixbuf *master_pixbuf = NULL;

  priv = texture->priv;

  g_return_if_fail (data != NULL);

  CLUTTER_MARK();

  if (!priv->is_tiled)
    {
      /* Single Texture */
      if (!priv->tiles)
	{
	  priv->tiles = g_new (guint, 1);
	  glGenTextures (1, priv->tiles);
	  create_textures = TRUE;
	}

      CLUTTER_NOTE (TEXTURE, "syncing for single tile");

      cogl_texture_bind (priv->target_type, priv->tiles[0]);
      cogl_texture_set_alignment (priv->target_type, 4, priv->width);

      cogl_texture_set_filters 
	(priv->target_type, 
	 priv->filter_quality ? CGL_LINEAR : CGL_NEAREST,
	 priv->filter_quality ? CGL_LINEAR : CGL_NEAREST);

      cogl_texture_set_wrap (priv->target_type, 
			     priv->repeat_x ? CGL_REPEAT : CGL_CLAMP_TO_EDGE,
			     priv->repeat_y ? CGL_REPEAT : CGL_CLAMP_TO_EDGE);

      priv->filter_quality = 1;
	  
      if (create_textures)
	{
	  gint tex_width, tex_height;

	  tex_width  = priv->width;
	  tex_height = priv->height;

	  if (priv->target_type == CGL_TEXTURE_2D) /* POT */
	    {
	      tex_width  = clutter_util_next_p2 (priv->width);
	      tex_height = clutter_util_next_p2 (priv->height);
	    }

	  cogl_texture_image_2d (priv->target_type,
				 CGL_RGBA,
				 tex_width, 
				 tex_height, 
				 priv->pixel_format,
				 priv->pixel_type,
				 NULL);
	}

      cogl_texture_sub_image_2d (priv->target_type,
				 0,
				 0,
				 width,
				 height,
				 priv->pixel_format,
				 priv->pixel_type,
				 data);
      return;
    }

  /* Multiple tiled texture */
  
  CLUTTER_NOTE (TEXTURE,
                "syncing for multiple tiles for %ix%i pixbuf",
		priv->width, priv->height);

  g_return_if_fail (priv->x_tiles != NULL && priv->y_tiles != NULL);

  master_pixbuf = gdk_pixbuf_new_from_data (data,
                                            GDK_COLORSPACE_RGB,
                                            has_alpha,
                                            8,
                                            width, height, rowstride,
                                            NULL, NULL);
  
  if (priv->tiles == NULL)
    {
      priv->tiles = g_new (guint, priv->n_x_tiles * priv->n_y_tiles);
      glGenTextures (priv->n_x_tiles * priv->n_y_tiles, priv->tiles);
      create_textures = TRUE;
    }

  for (x = 0; x < priv->n_x_tiles; x++)
    for (y = 0; y < priv->n_y_tiles; y++)
      {
        GdkPixbuf *pixtmp;
	gint src_h, src_w;
	
	src_w = priv->x_tiles[x].size;
	src_h = priv->y_tiles[y].size;

        pixtmp = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
                                 has_alpha,
                                 8,
                                 src_w, src_h);

	/* clip */
	if (priv->x_tiles[x].pos + src_w > priv->width)
	  src_w = priv->width - priv->x_tiles[x].pos;

	if (priv->y_tiles[y].pos + src_h > priv->height)
	  src_h = priv->height - priv->y_tiles[y].pos;

        gdk_pixbuf_copy_area (master_pixbuf,
                              priv->x_tiles[x].pos,
                              priv->y_tiles[y].pos,
                              src_w,
                              src_h,
                              pixtmp,
                              0, 0);
#ifdef CLUTTER_DUMP_TILES
	{
	  gchar  *filename;

	  filename = g_strdup_printf("/tmp/%i-%i-%i.png",
				     clutter_actor_get_id(CLUTTER_ACTOR(texture)), 
				     x, y);
	  printf("saving %s\n", filename);
	  gdk_pixbuf_save (pixtmp, filename , "png", NULL, NULL);
	}
#endif

	cogl_texture_bind (priv->target_type, priv->tiles[i]);
	
	cogl_texture_set_alignment (priv->target_type, 4, src_w);

	cogl_texture_set_filters 
	  (priv->target_type, 
	   priv->filter_quality ? CGL_LINEAR : CGL_NEAREST,
	   priv->filter_quality ? CGL_LINEAR : CGL_NEAREST);

	cogl_texture_set_wrap (priv->target_type, 
			       priv->repeat_x ? CGL_REPEAT : CGL_CLAMP_TO_EDGE,
			       priv->repeat_y ? CGL_REPEAT : CGL_CLAMP_TO_EDGE);
	if (create_textures)
	  {
	    cogl_texture_image_2d (priv->target_type,
				   CGL_RGBA,
				   gdk_pixbuf_get_width (pixtmp), 
				   gdk_pixbuf_get_height (pixtmp), 
				   priv->pixel_format,
				   priv->pixel_type,
				   gdk_pixbuf_get_pixels (pixtmp));
	  }
	else 
	  {
	    /* Textures already created, so just update whats inside 
	    */
	    cogl_texture_sub_image_2d (priv->target_type,
				       0,
				       0,
				       gdk_pixbuf_get_width (pixtmp),
				       gdk_pixbuf_get_height (pixtmp),
				       priv->pixel_format,
				       priv->pixel_type,
				       gdk_pixbuf_get_pixels (pixtmp));
	  }

	g_object_unref (pixtmp);

	i++;
      }

  g_object_unref (master_pixbuf);
}

static void
clutter_texture_unrealize (ClutterActor *actor)
{
  ClutterTexture        *texture;
  ClutterTexturePrivate *priv;

  texture = CLUTTER_TEXTURE(actor);
  priv = texture->priv;

  if (priv->tiles == NULL)
    return;

  CLUTTER_MARK();

  if (clutter_feature_available (CLUTTER_FEATURE_TEXTURE_READ_PIXELS))
    {
      /* Move image data from video to main memory. 
       * GL/ES cant do this - it probably makes sense 	 
       * to move this kind of thing into a ClutterProxyTexture
       * where this behaviour can be better controlled.
       *
       * Or make it controllable via a property.
       */
      if (priv->local_pixbuf == NULL)
	{
	  priv->local_pixbuf = clutter_texture_get_pixbuf (texture);
	  CLUTTER_NOTE (TEXTURE, "moved pixels into system (pixbuf) mem");
	}

      texture_free_gl_resources (texture);
    }

  CLUTTER_NOTE (TEXTURE, "Texture unrealized");
}

static void
clutter_texture_realize (ClutterActor *actor)
{
  ClutterTexture       *texture;
  ClutterTexturePrivate *priv;

  texture = CLUTTER_TEXTURE(actor);
  priv = texture->priv;

  CLUTTER_MARK();

  if (priv->local_pixbuf != NULL)
    {
      /* Move any local image data we have from unrealization  
       * back into video memory.	 
      */
      clutter_texture_set_pixbuf (texture, priv->local_pixbuf, NULL);
      g_object_unref (priv->local_pixbuf);
      priv->local_pixbuf = NULL;
    }
  else
    {
      if (clutter_feature_available (CLUTTER_FEATURE_TEXTURE_READ_PIXELS))
	{
	  /* Dont allow realization with no pixbuf - note set_pixbuf/data 
	   * will set realize flags.	 
	  */
	  CLUTTER_NOTE (TEXTURE,
			"Texture has no image data cannot realize");
	  
	  CLUTTER_NOTE (TEXTURE, "flags %i", actor->flags);
	  CLUTTER_ACTOR_UNSET_FLAGS (actor, CLUTTER_ACTOR_REALIZED);
	  CLUTTER_NOTE (TEXTURE, "flags %i", actor->flags);
	  return;
	}
    }

  CLUTTER_NOTE (TEXTURE, "Texture realized");
}

static void
clutter_texture_show (ClutterActor *self)
{
  ClutterActorClass *parent_class;

  /* chain up parent show */
  parent_class = CLUTTER_ACTOR_CLASS (clutter_texture_parent_class);
  if (parent_class->show)
    parent_class->show (self);

  clutter_actor_realize (self);
}

static void
clutter_texture_hide (ClutterActor *self)
{
  ClutterActorClass *parent_class;

  /* chain up parent hide */
  parent_class = CLUTTER_ACTOR_CLASS (clutter_texture_parent_class);
  if (parent_class->hide)
    parent_class->hide (self);

  clutter_actor_unrealize (self);
}

static void
clutter_texture_paint (ClutterActor *self)
{
  ClutterTexture *texture = CLUTTER_TEXTURE (self);
  ClutterTexturePrivate *priv = texture->priv;
  gint            x_1, y_1, x_2, y_2;
  ClutterColor    col = { 0xff, 0xff, 0xff, 0xff };

  if (!CLUTTER_ACTOR_IS_REALIZED (CLUTTER_ACTOR(texture)))
    clutter_actor_realize (CLUTTER_ACTOR(texture));

  if (priv->tiles == NULL)
    {
      /* We just need do debug this state, it doesn't really need to 
       * throw a an error as what previously happened. Sub classes
       * quite likely may not be able to realize.	 
      */
      CLUTTER_NOTE (PAINT, "unable to paint texture '%s', contains no tiles",
		    clutter_actor_get_name (self)
                           ? clutter_actor_get_name (self)
		           : "unknown");
      return;
    }

  CLUTTER_NOTE (PAINT,
                "painting texture '%s'",
		clutter_actor_get_name (self) ? clutter_actor_get_name (self)
                                              : "unknown");
  cogl_push_matrix ();

  switch (priv->target_type)
    {
    case CGL_TEXTURE_2D:
      cogl_enable (CGL_ENABLE_TEXTURE_2D|CGL_ENABLE_BLEND);
      break;
    case CGL_TEXTURE_RECTANGLE_ARB:
      cogl_enable (CGL_ENABLE_TEXTURE_RECT|CGL_ENABLE_BLEND);
      break;
    default:
      break;
    }

  col.alpha = clutter_actor_get_opacity (self);

  cogl_color (&col);

  clutter_actor_get_coords (self, &x_1, &y_1, &x_2, &y_2);

  CLUTTER_NOTE (PAINT, "paint to x1: %i, y1: %i x2: %i, y2: %i "
		       "opacity: %i",
		x_1, y_1, x_2, y_2,
		clutter_actor_get_opacity (self));

  /* Paint will of translated us */
  texture_render_to_gl_quad (texture, 0, 0, x_2 - x_1, y_2 - y_1);

  cogl_pop_matrix ();
}

static void 
clutter_texture_dispose (GObject *object)
{
  ClutterTexture *texture = CLUTTER_TEXTURE (object);
  ClutterTexturePrivate *priv;

  priv = texture->priv;

  texture_free_gl_resources (texture);

  if (priv->local_pixbuf != NULL)
    {
      g_object_unref (priv->local_pixbuf);
      priv->local_pixbuf = NULL;
    }

  G_OBJECT_CLASS (clutter_texture_parent_class)->dispose (object);
}

static void
clutter_texture_set_property (GObject      *object, 
			      guint         prop_id,
			      const GValue *value, 
			      GParamSpec   *pspec)
{
  ClutterTexture        *texture;
  ClutterTexturePrivate *priv;

  texture = CLUTTER_TEXTURE(object);
  priv = texture->priv;

  switch (prop_id) 
    {
    case PROP_PIXBUF:
      clutter_texture_set_pixbuf (texture, 
				  (GdkPixbuf*)g_value_get_pointer(value),
				  NULL);
      break;
    case PROP_USE_TILES:
      priv->is_tiled = g_value_get_boolean (value);

      if (priv->target_type == CGL_TEXTURE_RECTANGLE_ARB && priv->is_tiled)
	priv->target_type = CGL_TEXTURE_2D;

      CLUTTER_NOTE (TEXTURE, "Texture is tiled ? %s",
		    priv->is_tiled ? "yes" : "no");
      break;
    case PROP_MAX_TILE_WASTE:
      priv->max_tile_waste = g_value_get_int (value);
      break;
    case PROP_SYNC_SIZE:
      priv->sync_actor_size = g_value_get_boolean (value);
      break;
    case PROP_REPEAT_X:
      priv->repeat_x = g_value_get_boolean (value);
      break;
    case PROP_REPEAT_Y:
      priv->repeat_y = g_value_get_boolean (value);
      break;
    case PROP_FILTER_QUALITY:
      priv->filter_quality = g_value_get_int (value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static void
clutter_texture_get_property (GObject    *object, 
			      guint       prop_id,
			      GValue     *value, 
			      GParamSpec *pspec)
{
  ClutterTexture        *texture;
  ClutterTexturePrivate *priv;

  texture = CLUTTER_TEXTURE(object);
  priv = texture->priv;

  switch (prop_id) 
    {
    case PROP_PIXBUF:
      {
	GdkPixbuf *pixb;
	pixb = clutter_texture_get_pixbuf (texture);
	g_value_set_pointer (value, pixb);
      }
      break;
    case PROP_USE_TILES:
      g_value_set_boolean (value, priv->is_tiled);
      break;
    case PROP_MAX_TILE_WASTE:
      g_value_set_int (value, priv->max_tile_waste);
      break;
    case PROP_PIXEL_TYPE:
      g_value_set_int (value, priv->pixel_type);
      break;
    case PROP_PIXEL_FORMAT:
      g_value_set_int (value, priv->pixel_format);
      break;
    case PROP_SYNC_SIZE:
      g_value_set_boolean (value, priv->sync_actor_size);
      break;
    case PROP_REPEAT_X:
      g_value_set_boolean (value, priv->repeat_x);
      break;
    case PROP_REPEAT_Y:
      g_value_set_boolean (value, priv->repeat_y);
      break;
    case PROP_FILTER_QUALITY:
      g_value_set_int (value, priv->filter_quality);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    } 
}


static void
clutter_texture_class_init (ClutterTextureClass *klass)
{
  GObjectClass        *gobject_class;
  ClutterActorClass *actor_class;

  gobject_class = (GObjectClass*) klass;
  actor_class = (ClutterActorClass*) klass;

  g_type_class_add_private (klass, sizeof (ClutterTexturePrivate));

  actor_class->paint      = clutter_texture_paint;
  actor_class->realize    = clutter_texture_realize;
  actor_class->unrealize  = clutter_texture_unrealize;
  actor_class->show       = clutter_texture_show;
  actor_class->hide       = clutter_texture_hide;

  gobject_class->dispose      = clutter_texture_dispose;
  gobject_class->set_property = clutter_texture_set_property;
  gobject_class->get_property = clutter_texture_get_property;

  g_object_class_install_property
    (gobject_class, PROP_PIXBUF,
     g_param_spec_pointer ("pixbuf",
			   "Pixbuf source for Texture.",
			   "Pixbuf source for Texture.",
			   CLUTTER_PARAM_READWRITE));

  g_object_class_install_property
    (gobject_class, PROP_USE_TILES,
     g_param_spec_boolean ("tiled",
			   "Enable use of tiled textures",
			   "Enables the use of tiled GL textures to more "
			   "efficiently use available texture memory",
			   /* FIXME: This default set at runtime :/  
                            * As tiling depends on what GL features available.
                            * Need to figure out better solution
			   */
			   (clutter_feature_available 
			     (CLUTTER_FEATURE_TEXTURE_RECTANGLE) == FALSE),
			   G_PARAM_CONSTRUCT_ONLY | CLUTTER_PARAM_READWRITE));

  g_object_class_install_property
    (gobject_class, PROP_SYNC_SIZE,
     g_param_spec_boolean ("sync-size",
			   "Sync size of actor",
			   "Auto sync size of actor to underlying pixbuf"
			   "dimentions",
			   TRUE,
			   G_PARAM_CONSTRUCT | CLUTTER_PARAM_READWRITE));

  g_object_class_install_property
    (gobject_class, PROP_REPEAT_X,
     g_param_spec_boolean ("repeat-x",
			   "Tile underlying pixbuf in x direction",
			   "Reapeat underlying pixbuf rather than scale" 
			   "in x direction. Currently UNWORKING",
			   FALSE,
			   G_PARAM_CONSTRUCT | CLUTTER_PARAM_READWRITE));

  g_object_class_install_property
    (gobject_class, PROP_REPEAT_Y,
     g_param_spec_boolean ("repeat-y",
			   "Tile underlying pixbuf in y direction",
			   "Reapeat underlying pixbuf rather than scale" 
			   "in y direction. Currently UNWORKING",
			   FALSE,
			   G_PARAM_CONSTRUCT | CLUTTER_PARAM_READWRITE));

  /* FIXME: Ideally this option needs to have some kind of global
   *        overide as to imporve performance.
  */
  g_object_class_install_property
    (gobject_class, PROP_FILTER_QUALITY,
     g_param_spec_int ("filter-quality",
		       "Quality of filter used when scaling a texture",
		       "Values 0 and 1 current only supported, with 0"
		       "being lower quality but fast, 1 being better "
		       "quality but slower. ( Currently just maps to "
		       " GL_NEAREST / GL_LINEAR )",
		       0,
		       G_MAXINT,
		       1,
		       G_PARAM_CONSTRUCT | CLUTTER_PARAM_READWRITE));

  g_object_class_install_property
    (gobject_class, PROP_MAX_TILE_WASTE,
     g_param_spec_int ("tile-waste",
		       "Tile dimention to waste",
		       "Max wastage dimention of a texture when using "
		       "tiled textures. Bigger values use less textures, "
		       "smaller values less texture memory. ",
		       0,
		       G_MAXINT,
		       64,
		       G_PARAM_CONSTRUCT_ONLY | CLUTTER_PARAM_READWRITE));

  g_object_class_install_property
    (gobject_class, PROP_PIXEL_TYPE,
     g_param_spec_int ("pixel-type",
		       "Texture Pixel Type",
		       "GL texture pixel type used",
		       0,
		       G_MAXINT,
		       PIXEL_TYPE,
		       G_PARAM_READABLE));

  g_object_class_install_property
    (gobject_class, PROP_PIXEL_FORMAT,
     g_param_spec_int ("pixel-format",
		       "Texture pixel format",
		       "GL texture pixel format used",
		       0,
		       G_MAXINT,
		       CGL_RGBA,
		       G_PARAM_READABLE));

  /**
   * ClutterTexture::size-change:
   * @texture: the texture which received the signal
   * @width: the width of the new texture
   * @height: the height of the new texture
   *
   * The ::size-change signal is emitted each time the size of the
   * pixbuf used by @texture changes.  The new size is given as
   * argument to the callback.
   */
  texture_signals[SIZE_CHANGE] =
    g_signal_new ("size-change",
		  G_TYPE_FROM_CLASS (gobject_class),
		  G_SIGNAL_RUN_LAST,
		  G_STRUCT_OFFSET (ClutterTextureClass, size_change),
		  NULL, NULL,
		  clutter_marshal_VOID__INT_INT,
		  G_TYPE_NONE, 
		  2, G_TYPE_INT, G_TYPE_INT);
  /**
   * ClutterTexture::pixbuf-change:
   * @texture: the texture which received the signal
   * 
   * The ::pixbuf-change signal is emitted each time the pixbuf
   * used by @texture changes.
   */
  texture_signals[PIXBUF_CHANGE] =
    g_signal_new ("pixbuf-change",
		  G_TYPE_FROM_CLASS (gobject_class),
		  G_SIGNAL_RUN_LAST,
		  G_STRUCT_OFFSET (ClutterTextureClass, pixbuf_change),
		  NULL, NULL,
		  g_cclosure_marshal_VOID__VOID,
		  G_TYPE_NONE, 
		  0); 
}

static void
clutter_texture_init (ClutterTexture *self)
{
  ClutterTexturePrivate *priv;

  self->priv = priv = CLUTTER_TEXTURE_GET_PRIVATE (self); 

  priv->max_tile_waste = 64;
  priv->filter_quality = 0;
  priv->is_tiled     = TRUE;
  priv->pixel_type   = PIXEL_TYPE;
  priv->pixel_format = CGL_RGBA;
  priv->repeat_x     = FALSE;
  priv->repeat_y     = FALSE;

  if (clutter_feature_available (CLUTTER_FEATURE_TEXTURE_RECTANGLE))
    {
      priv->target_type  = CGL_TEXTURE_RECTANGLE_ARB;
      priv->is_tiled     = FALSE;
    }
  else
    priv->target_type = CGL_TEXTURE_2D;
}

static void
pixbuf_destroy_notify (guchar  *pixels, gpointer data)
{
  g_free (pixels);
}

/**
 * clutter_texture_get_pixbuf:
 * @texture: A #ClutterTexture
 *
 * Gets a #GdkPixbuf representation of the #ClutterTexture data. 
 * The created #GdkPixbuf is not owned by the texture but the caller.  
 *
 * Return value: A #GdkPixbuf
 **/
GdkPixbuf*
clutter_texture_get_pixbuf (ClutterTexture* texture)
{
#if HAVE_COGL_GL
  ClutterTexturePrivate *priv;
  GdkPixbuf             *pixbuf = NULL;
  guchar                *pixels = NULL;
  int                    bpp = 4;

  priv = texture->priv;

  if (priv->tiles == NULL)
    return NULL; 

  if (priv->pixel_format == CGL_YCBCR_MESA)
    return NULL; 		/* FIXME: convert YUV */

  if (priv->pixel_format == CGL_RGB || priv->pixel_format == CGL_BGR)
    bpp = 3;

  if (!priv->is_tiled)
    {
      pixels = g_malloc (((priv->width * bpp + 3) &~ 3) * priv->height);
      
      if (!pixels)
	return NULL;

      glBindTexture(priv->target_type, priv->tiles[0]);

      glPixelStorei (GL_UNPACK_ROW_LENGTH, priv->width);
      glPixelStorei (GL_UNPACK_ALIGNMENT, 4);

      /* read data from gl text and return as pixbuf */
      /* No such func in gles... */
      glGetTexImage (priv->target_type,
		     0,
		     (priv->pixel_format == CGL_RGBA 
		      || priv->pixel_format == CGL_BGRA) ? 
		     CGL_RGBA : CGL_RGB, 
		     PIXEL_TYPE,
		     (GLvoid*)pixels);

      pixbuf = gdk_pixbuf_new_from_data ((const guchar*)pixels,
					 GDK_COLORSPACE_RGB,
					 (priv->pixel_format == CGL_RGBA
					  || priv->pixel_format == CGL_BGRA),
					 8,
					 priv->width,
					 priv->height,
					 ((priv->width * bpp + 3) &~ 3),
					 pixbuf_destroy_notify,
					 NULL);
    }
  else
    {
      int x,y,i;

      i = 0;

      pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
			       (priv->pixel_format == CGL_RGBA
				|| priv->pixel_format == CGL_BGRA),
			       8,
			       priv->width,
			       priv->height);

      for (x = 0; x < priv->n_x_tiles; x++)
	for (y = 0; y < priv->n_y_tiles; y++)
	  {
	    GdkPixbuf  *tmp_pixb;
	    gint        src_h, src_w;
	
	    src_w = priv->x_tiles[x].size;
	    src_h = priv->y_tiles[y].size;

	    pixels = g_malloc (((src_w  * bpp) &~ 3) * src_h);

	    glBindTexture(priv->target_type, priv->tiles[i]);
	    
	    glPixelStorei (GL_UNPACK_ROW_LENGTH, src_w);
	    glPixelStorei (GL_UNPACK_ALIGNMENT, 4);

	    glGetTexImage (priv->target_type,
			   0,
			   (priv->pixel_format == CGL_RGBA 
			    || priv->pixel_format == CGL_BGRA) ? 
			   CGL_RGBA : CGL_RGB, 
			   PIXEL_TYPE,
			   (GLvoid *) pixels);
	
            /* Clip */
            if (priv->x_tiles[x].pos + src_w > priv->width)
              src_w = priv->width - priv->x_tiles[x].pos;

            if (priv->y_tiles[y].pos + src_h > priv->height)
              src_h = priv->height - priv->y_tiles[y].pos;

	    tmp_pixb =
	      gdk_pixbuf_new_from_data ((const guchar*)pixels,
					GDK_COLORSPACE_RGB,
					(priv->pixel_format == CGL_RGBA
					 || priv->pixel_format == CGL_BGRA),
					8,
					src_w,
					src_h,
					((src_w * bpp + 3) &~ 3),
					pixbuf_destroy_notify,
					NULL);
	
	    gdk_pixbuf_copy_area (tmp_pixb,
				  0,
				  0,
				  src_w,
				  src_h,
				  pixbuf,
				  priv->x_tiles[x].pos,
				  priv->x_tiles[y].pos);

	    g_object_unref (tmp_pixb);

	    i++;
	  }

    }

  return pixbuf;
#else

  /* FIXME: func call wont work for GLES... 
   *        features need to reflect this.
   */
  return NULL;
#endif
}

/**
 * clutter_texture_set_from_rgb_data:
 * @texture: A #ClutterTexture
 * @data: Image data in RGB type colorspace.
 * @has_alpha: Set to TRUE if image data has a alpha channel.
 * @width: Width in pixels of image data.
 * @height: Height in pixels of image data
 * @rowstride: Distance in bytes between row starts.
 * @bpp: bytes per pixel ( Currently only 4 supported )
 * @flags: #ClutterTextureFlags
 * @error: FIXME.
 *
 * Sets #ClutterTexture image data.
 *
 * Return value: TRUE on success, FALSE on failure. 
 *
 * Since 0.4. This function is likely to change in future versions.
 **/
gboolean          
clutter_texture_set_from_rgb_data   (ClutterTexture     *texture,
				     const guchar       *data,
				     gboolean            has_alpha,
				     gint                width,
				     gint                height,
				     gint                rowstride,
				     gint                bpp,
				     ClutterTextureFlags flags,
				     GError            **error)
{
  ClutterTexturePrivate *priv;
  gboolean               texture_dirty = TRUE, size_change = FALSE;
  COGLenum               prev_format;
  guchar                *copy_data = NULL;

  priv = texture->priv;

  g_return_val_if_fail (data != NULL, FALSE);

  /* Needed for GL_RGBA (internal format) and gdk pixbuf usage */
  g_return_val_if_fail (bpp == 4, FALSE); 
  
  texture_dirty = size_change =
    (width != priv->width || height != priv->height);

  prev_format = priv->pixel_format;
  
  if (has_alpha)
    priv->pixel_format = CGL_RGBA;
  else
    priv->pixel_format = CGL_RGB;

  if (flags & CLUTTER_TEXTURE_RGB_FLAG_BGR)
    {
#if HAVE_COGL_GL
      if (has_alpha)
	priv->pixel_format = CGL_BGRA;
      else
	priv->pixel_format = CGL_BGR;
#else
      /* GLES has no BGR format*/
      copy_data = rgb_to_bgr (data, has_alpha, width, height, rowstride);
#endif /* HAVE_COGL_GL */
    }

  if (flags & CLUTTER_TEXTURE_RGB_FLAG_PREMULT)
    copy_data = un_pre_multiply_alpha (data, width, height, rowstride);

  if (prev_format != priv->pixel_format || priv->pixel_type != PIXEL_TYPE)
    texture_dirty = TRUE;

  priv->pixel_type = PIXEL_TYPE;
  priv->width      = width;
  priv->height     = height;

  if (texture_dirty)
    {
      texture_free_gl_resources (texture);

      if (priv->is_tiled == FALSE)
	{
	  if (priv->target_type == CGL_TEXTURE_RECTANGLE_ARB &&
              !cogl_texture_can_size (CGL_TEXTURE_RECTANGLE_ARB,
				      priv->pixel_format,
				      priv->pixel_type,
				      priv->width, 
				      priv->height))
	    {
	      /* If we cant create NPOT tex of this size fall back to tiles */
	      CLUTTER_NOTE (TEXTURE, 
			    "Cannot make npots of size %ix%i "
			    "falling back to tiled",
			    priv->width,
			    priv->height);

	      priv->target_type = CGL_TEXTURE_2D;
	    }
	  
	  if (priv->target_type == CGL_TEXTURE_2D &&
	      !cogl_texture_can_size (CGL_TEXTURE_2D,
				      priv->pixel_format, 
				      priv->pixel_type,
				      clutter_util_next_p2 (priv->width), 
				      clutter_util_next_p2 (priv->height)))
	    { 
	      priv->is_tiled = TRUE; 
	    }
	}

      /* Figure our tiling etc */
      if (priv->is_tiled)
	texture_init_tiles (texture); 
    }

  CLUTTER_NOTE (TEXTURE, "set size %ix%i\n",
		priv->width,
		priv->height);

  /* Set Error from this */
  texture_upload_data (texture, 
		       copy_data != NULL ? copy_data : data, 
		       has_alpha, 
		       width, 
		       height, 
		       rowstride, 
		       bpp);

  CLUTTER_ACTOR_SET_FLAGS (CLUTTER_ACTOR (texture), CLUTTER_ACTOR_REALIZED);

  if (size_change)
    {
      g_signal_emit (texture, texture_signals[SIZE_CHANGE], 
		     0, priv->width, priv->height);

      if (priv->sync_actor_size)
	clutter_actor_set_size (CLUTTER_ACTOR(texture), 
				priv->width, 
				priv->height);
    }
  
  /* rename signal */
  g_signal_emit (texture, texture_signals[PIXBUF_CHANGE], 0); 

  /* If resized actor may need resizing but paint() will do this */
  if (CLUTTER_ACTOR_IS_MAPPED (CLUTTER_ACTOR(texture)))
    clutter_actor_queue_redraw (CLUTTER_ACTOR(texture));

  if (copy_data != NULL)
    g_free (copy_data);

  return TRUE;
}

/**
 * clutter_texture_set_from_yuv_data:
 * @texture: A #ClutterTexture
 * @data: Image data in RGB type colorspace.
 * @width: Width in pixels of image data.
 * @height: Height in pixels of image data
 * @flags: #ClutterTextureFlags
 * @error: Return location for a #GError, or %NULL.
 *
 * Sets a #ClutterTexture from YUV image data. If an error occurred,
 * %FALSE is returned and @error is set.
 *
 * This function is likely to change in future versions.
 *
 * Return value: %TRUE if the texture was successfully updated
 *
 * Since 0.4.
 **/
gboolean          
clutter_texture_set_from_yuv_data   (ClutterTexture     *texture,
				     const guchar       *data,
				     gint                width,
				     gint                height,
				     ClutterTextureFlags flags,
				     GError            **error)
{
  ClutterTexturePrivate *priv;
  gboolean               texture_dirty = TRUE, size_change = FALSE;

  g_return_val_if_fail (CLUTTER_IS_TEXTURE (texture), FALSE);

  if (!clutter_feature_available (CLUTTER_FEATURE_TEXTURE_YUV))
    {
      g_set_error (error, CLUTTER_TEXTURE_ERROR,
                   CLUTTER_TEXTURE_ERROR_NO_YUV,
                   "YUV textures are not supported");
      return FALSE;
    }

  priv = texture->priv;

  /* FIXME: check other image props */
  size_change = (width != priv->width || height != priv->height);
  texture_dirty = size_change || (priv->pixel_format != CGL_YCBCR_MESA);

  priv->width  = width;
  priv->height = height;
  priv->pixel_type = (flags & CLUTTER_TEXTURE_YUV_FLAG_YUV2) ?
                                CGL_UNSIGNED_SHORT_8_8_REV_MESA : 
                                CGL_UNSIGNED_SHORT_8_8_MESA;
  priv->pixel_format = CGL_YCBCR_MESA;
  priv->target_type = CGL_TEXTURE_2D;

  if (texture_dirty)      
    texture_free_gl_resources (texture);

  if (!priv->tiles)
    {
      priv->tiles = g_new (guint, 1);
      glGenTextures (1, priv->tiles);
    }

  cogl_texture_bind (priv->target_type, priv->tiles[0]);

  cogl_texture_set_filters (priv->target_type, 
			    priv->filter_quality ? CGL_LINEAR : CGL_NEAREST,
			    priv->filter_quality ? CGL_LINEAR : CGL_NEAREST);

  if (texture_dirty)
    {
      gint new_width, new_height;

      new_width = clutter_util_next_p2 (priv->width);
      new_height = clutter_util_next_p2 (priv->height);

      /* FIXME: need to check size limits correctly - does not
       * seem to work if correct format and type are used so
       * this is really a guess...
      */
      if (cogl_texture_can_size (CGL_TEXTURE_2D,
				 CGL_RGBA, 
				 CGL_UNSIGNED_BYTE,
                                 new_width, new_height))
	{
	  cogl_texture_image_2d (priv->target_type,
				 priv->pixel_format,
				 new_width, new_height,
                                 priv->pixel_format,
				 priv->pixel_type,
				 NULL);
	}
      else
        {
          g_set_error (error, CLUTTER_TEXTURE_ERROR,
                       CLUTTER_TEXTURE_ERROR_OUT_OF_MEMORY,
                       "Unable to allocate a texture of %d by %d pixels",
                       new_width,
                       new_height);

	  return FALSE; 		/* FIXME: add tiling */
       }
    }

  cogl_texture_sub_image_2d (priv->target_type,
			     0,
			     0,
			     priv->width,
			     priv->height,
			     priv->pixel_format,
			     priv->pixel_type,
			     data);

  CLUTTER_ACTOR_SET_FLAGS (CLUTTER_ACTOR (texture), CLUTTER_ACTOR_REALIZED);

  if (size_change)
    {
      g_signal_emit (texture, texture_signals[SIZE_CHANGE], 
		     0, priv->width, priv->height);

      if (priv->sync_actor_size)
	clutter_actor_set_size (CLUTTER_ACTOR(texture), 
				priv->width, 
				priv->height);
    }

  g_signal_emit (texture, texture_signals[PIXBUF_CHANGE], 0); 

  if (CLUTTER_ACTOR_IS_MAPPED (CLUTTER_ACTOR(texture)))
    clutter_actor_queue_redraw (CLUTTER_ACTOR(texture));

  return TRUE;
}

/**
 * clutter_texture_set_pixbuf:
 * @texture: A #ClutterTexture
 * @pixbuf: A #GdkPixbuf
 * @error: Return location for a #GError, or %NULL
 *
 * Sets a  #ClutterTexture image data from a #GdkPixbuf. In case of
 * failure, %FALSE is returned and @error is set.
 *
 * Return value: %TRUE if the pixbuf was successfully set
 *
 * Since: 0.4
 */
gboolean
clutter_texture_set_pixbuf (ClutterTexture *texture,
                            GdkPixbuf      *pixbuf,
			    GError        **error)
{
  ClutterTexturePrivate *priv;

  priv = texture->priv;

  g_return_val_if_fail (pixbuf != NULL, FALSE);

  return clutter_texture_set_from_rgb_data (texture,
					    gdk_pixbuf_get_pixels (pixbuf),
					    gdk_pixbuf_get_has_alpha (pixbuf),
					    gdk_pixbuf_get_width (pixbuf),
					    gdk_pixbuf_get_height (pixbuf),
					    gdk_pixbuf_get_rowstride (pixbuf),
					    4,
					    0,
					    error);
}

/**
 * clutter_texture_new_from_pixbuf:
 * @pixbuf: A #GdkPixbuf
 *
 * Creates a new #ClutterTexture object.
 *
 * Return value: A newly created #ClutterTexture object.
 **/
ClutterActor*
clutter_texture_new_from_pixbuf (GdkPixbuf *pixbuf)
{
  ClutterTexture *texture;

  texture = g_object_new (CLUTTER_TYPE_TEXTURE, "pixbuf", pixbuf, NULL);

  return CLUTTER_ACTOR(texture);
}

/**
 * clutter_texture_new:
 *
 * Creates a new empty #ClutterTexture object.
 *
 * Return value: A newly created #ClutterTexture object.
 **/
ClutterActor *
clutter_texture_new (void)
{
  return g_object_new (CLUTTER_TYPE_TEXTURE, NULL);
}

/**
 * clutter_texture_get_base_size:
 * @texture: A #ClutterTexture
 * @width:   Pointer to gint to be populated with width value if non NULL.
 * @height:  Pointer to gint to be populated with height value if non NULL.
 *
 * Gets the size in pixels of the untransformed underlying texture pixbuf data.
 *
 **/
void 				/* FIXME: rename to get_image_size */
clutter_texture_get_base_size (ClutterTexture *texture, 
			       gint           *width,
			       gint           *height)
{
  /* Attempt to realize, mainly for subclasses ( such as labels )
   * which maynot create pixbuf data and thus base size until
   * realization happens.
  */
  if (!CLUTTER_ACTOR_IS_REALIZED(CLUTTER_ACTOR(texture)))
    clutter_actor_realize (CLUTTER_ACTOR(texture));

  if (width)
    *width = texture->priv->width;

  if (height)
    *height = texture->priv->height;

}

/**
 * clutter_texture_bind_tile:
 * @texture: A #ClutterTexture
 * @index_: Tile index to bind
 *
 * Proxys a call to glBindTexture a to bind an internal 'tile'. 
 *
 * This function is only useful for sub class implementations 
 * and never should be called by an application.
 **/
void
clutter_texture_bind_tile (ClutterTexture *texture,
                           gint            index_)
{
  ClutterTexturePrivate *priv;

  g_return_if_fail (CLUTTER_IS_TEXTURE (texture));

  priv = texture->priv;

  cogl_texture_bind (priv->target_type, priv->tiles[index_]);
}

/**
 * clutter_texture_get_n_tiles:
 * @texture: A #ClutterTexture
 * @n_x_tiles: Location to store number of tiles in horizonally axis
 * @n_y_tiles: Location to store number of tiles in vertical axis
 *
 * Retreives internal tile dimentioning.
 *
 * This function is only useful for sub class implementations 
 * and never should be called by an application.
 **/
void
clutter_texture_get_n_tiles (ClutterTexture *texture, 
			     gint           *n_x_tiles,
			     gint           *n_y_tiles)
{
  if (n_x_tiles)
    *n_x_tiles = texture->priv->n_x_tiles;

  if (n_y_tiles)
    *n_y_tiles = texture->priv->n_y_tiles;

}

/**
 * clutter_texture_get_x_tile_detail:
 * @texture: A #ClutterTexture
 * @x_index: X index of tile to query
 * @pos: Location to store tiles X position
 * @size: Location to store tiles horizontal size in pixels 
 * @waste: Location to store tiles horizontal wastage in pixels
 *
 * Retreives details of a tile on x axis.
 *
 * This function is only useful for sub class implementations 
 * and never should be called by an application.
 **/
void
clutter_texture_get_x_tile_detail (ClutterTexture *texture, 
				   gint            x_index,
				   gint           *pos,
				   gint           *size,
				   gint           *waste)
{
  g_return_if_fail(x_index < texture->priv->n_x_tiles);

  if (pos)
    *pos = texture->priv->x_tiles[x_index].pos;

  if (size)
    *size = texture->priv->x_tiles[x_index].size;

  if (waste)
    *waste = texture->priv->x_tiles[x_index].waste;
}

/**
 * clutter_texture_get_y_tile_detail:
 * @texture: A #ClutterTexture
 * @y_index: Y index of tile to query
 * @pos: Location to store tiles Y position
 * @size: Location to store tiles vertical size in pixels 
 * @waste: Location to store tiles vertical wastage in pixels
 *
 * Retreives details of a tile on y axis.
 *
 * This function is only useful for sub class implementations 
 * and never should be called by an application.
 **/
void
clutter_texture_get_y_tile_detail (ClutterTexture *texture, 
				   gint            y_index,
				   gint           *pos,
				   gint           *size,
				   gint           *waste)
{
  ClutterTexturePrivate *priv;

  g_return_if_fail (CLUTTER_IS_TEXTURE (texture));
  
  priv = texture->priv;

  g_return_if_fail (y_index < priv->n_y_tiles);

  if (pos)
    *pos = priv->y_tiles[y_index].pos;

  if (size)
    *size = priv->y_tiles[y_index].size;

  if (waste)
    *waste = priv->y_tiles[y_index].waste;
}

/**
 * clutter_texture_has_generated_tiles:
 * @texture: A #ClutterTexture
 *
 * Checks if #ClutterTexture has generated underlying GL texture tiles.
 *
 * This function is only useful for sub class implementations 
 * and never should be called by an application.
 *
 * Return value: TRUE if texture has pregenerated GL tiles.
 **/
gboolean
clutter_texture_has_generated_tiles (ClutterTexture *texture)
{
  g_return_val_if_fail (CLUTTER_IS_TEXTURE (texture), FALSE);

  return (texture->priv->tiles != NULL);
}

/**
 * clutter_texture_is_tiled:
 * @texture: A #ClutterTexture
 *
 * Checks if #ClutterTexture is tiled.
 *
 * This function is only useful for sub class implementations 
 * and never should be called by an application.
 *
 * Return value: TRUE if texture is tiled
 **/
gboolean
clutter_texture_is_tiled (ClutterTexture *texture)
{
  g_return_val_if_fail (CLUTTER_IS_TEXTURE (texture), FALSE);

  return texture->priv->is_tiled;
}