C++ CLUTTER_TEXTURE函数代码示例

static void
pp_super_aa_paint (ClutterActor *actor)
{
  CoglHandle texture;
  gfloat width, height;

  PPSuperAAPrivate *priv = PP_SUPER_AA (actor)->priv;

  clutter_actor_get_size (actor, &width, &height);
  texture = clutter_texture_get_cogl_texture (CLUTTER_TEXTURE (actor));

  if (!texture ||
      (cogl_texture_get_width (texture) != (guint)(width * priv->x_res)) ||
      (cogl_texture_get_height (texture) != (guint)(height * priv->y_res)))
    {
      texture = cogl_texture_new_with_size ((guint)(width * priv->x_res),
                                            (guint)(height * priv->y_res),
                                            COGL_TEXTURE_NO_SLICING,
                                            COGL_PIXEL_FORMAT_RGBA_8888_PRE);
      clutter_texture_set_cogl_texture (CLUTTER_TEXTURE (actor), texture);
      cogl_handle_unref (texture);
    }

  CLUTTER_ACTOR_CLASS (pp_super_aa_parent_class)->paint (actor);
}

static void
mex_telepathy_channel_create_preview (MexTelepathyChannel *self)
{
  MexTelepathyChannelPrivate *priv = MEX_TELEPATHY_CHANNEL (self)->priv;

  ClutterActor *video_preview_area;

  priv->video_outgoing = clutter_texture_new ();
  clutter_texture_set_keep_aspect_ratio (CLUTTER_TEXTURE (priv->video_outgoing),
                                         TRUE);

  priv->outgoing_sink =
    clutter_gst_video_sink_new (CLUTTER_TEXTURE (priv->video_outgoing));

  video_preview_area = mx_stack_new ();

  clutter_container_add (CLUTTER_CONTAINER (video_preview_area),
                         mex_telepathy_channel_create_static_image(),
                         priv->video_outgoing,
                         NULL);

  mx_stylable_set_style_class (MX_STYLABLE (video_preview_area),
                               "PreviewStack");

  clutter_actor_set_height (video_preview_area, 150.0);
  clutter_actor_add_effect (video_preview_area,
                            CLUTTER_EFFECT (
                              mex_telepathy_channel_create_shadow ()));

  priv->preview_area = mx_frame_new ();
  mx_stylable_set_style_class (MX_STYLABLE (priv->preview_area),
                               "PreviewPadding");
  mx_bin_set_child (MX_BIN (priv->preview_area), video_preview_area);
}

/**
 * shell_global_create_root_pixmap_actor:
 * @global: a #ShellGlobal
 *
 * Creates an actor showing the root window pixmap.
 *
 * Return value: (transfer none): a #ClutterActor with the root window pixmap.
 *               The actor is floating, hence (transfer none).
 */
ClutterActor *
shell_global_create_root_pixmap_actor (ShellGlobal *global)
{
  GdkWindow *window;
  ClutterActor *stage;
  ClutterColor stage_color;

  /* The actor created is actually a ClutterClone of global->root_pixmap. */

  if (global->root_pixmap == NULL)
    {
      global->root_pixmap = clutter_glx_texture_pixmap_new ();

      clutter_texture_set_repeat (CLUTTER_TEXTURE (global->root_pixmap),
                                  TRUE, TRUE);

      /* The low and medium quality filters give nearest-neighbor resizing. */
      clutter_texture_set_filter_quality (CLUTTER_TEXTURE (global->root_pixmap),
                                          CLUTTER_TEXTURE_QUALITY_HIGH);

      /* Initialize to the stage color, since that's what will be seen
       * in the main view if there's no actual background window.
       */
      stage = mutter_plugin_get_stage (global->plugin);
      clutter_stage_get_color (CLUTTER_STAGE (stage), &stage_color);
      clutter_texture_set_from_rgb_data (CLUTTER_TEXTURE (global->root_pixmap),
                                         /* ClutterColor has the same layout
                                          * as one pixel of RGB(A) data.
                                          */
                                         (const guchar *)&stage_color, FALSE,
                                         /* w, h, rowstride, bpp, flags */
                                         1, 1, 3, 3, 0, NULL);

      /* We can only clone an actor within a stage, so we hide the source
       * texture then add it to the stage */
      clutter_actor_hide (global->root_pixmap);
      clutter_container_add_actor (CLUTTER_CONTAINER (stage),
                                   global->root_pixmap);

      /* This really should never happen; but just in case... */
      g_signal_connect (global->root_pixmap, "destroy",
                        G_CALLBACK (root_pixmap_destroy), global);

      /* Metacity handles changes to some root window properties in its global
       * event filter, though not _XROOTPMAP_ID. For all root window property
       * changes, the global filter returns GDK_FILTER_CONTINUE, so our
       * window specific filter will be called after the global one.
       *
       * Because Metacity is already handling root window property updates,
       * we don't have to worry about adding the PropertyChange mask to the
       * root window to get PropertyNotify events.
       */
      window = gdk_get_default_root_window ();
      gdk_window_add_filter (window, root_window_filter, global);

      update_root_window_pixmap (global);
    }

  return clutter_clone_new (global->root_pixmap);
}

static void
mex_telepathy_channel_create_incoming_video (MexTelepathyChannel *self)
{
  MexTelepathyChannelPrivate *priv = MEX_TELEPATHY_CHANNEL (self)->priv;

  ClutterActor *video_incoming_area;

  /* Setup the incoming surface to draw to */
  priv->incoming_texture = clutter_texture_new ();
  clutter_texture_set_keep_aspect_ratio (CLUTTER_TEXTURE (priv->incoming_texture),
                                         TRUE);

  video_incoming_area = mx_stack_new ();

  clutter_container_add (CLUTTER_CONTAINER (video_incoming_area),
                         mex_telepathy_channel_create_static_image(),
                         priv->incoming_texture,
                         NULL);

  /* Create a frame for it with a styled border */
  priv->full_frame = mx_frame_new();
  clutter_actor_set_name (priv->full_frame, "Incoming Frame");
  mx_bin_set_fill (MX_BIN (priv->full_frame), TRUE, TRUE);
  mx_stylable_set_style_class (MX_STYLABLE (priv->full_frame),
                               "CallWindow");
  clutter_actor_add_effect (priv->full_frame,
                            CLUTTER_EFFECT (
                              mex_telepathy_channel_create_shadow ()));
  clutter_container_add_actor (CLUTTER_CONTAINER (priv->full_frame),
                               video_incoming_area);

  priv->incoming_sink =
    clutter_gst_video_sink_new (CLUTTER_TEXTURE (priv->incoming_texture));
}

static void
toggle_texture_quality (ClutterActor *actor)
{
  if (CLUTTER_IS_CONTAINER (actor))
    clutter_container_foreach (CLUTTER_CONTAINER (actor),
                               (ClutterCallback) toggle_texture_quality,
                               NULL);

  if (CLUTTER_IS_TEXTURE (actor))
    {
      ClutterTextureQuality quality;

      quality = clutter_texture_get_filter_quality (CLUTTER_TEXTURE (actor));

      if (quality == CLUTTER_TEXTURE_QUALITY_HIGH)
        quality = CLUTTER_TEXTURE_QUALITY_MEDIUM;
      else
        quality = CLUTTER_TEXTURE_QUALITY_HIGH;

      g_print ("switching to quality %s for %p\n",
               quality == CLUTTER_TEXTURE_QUALITY_HIGH
               ? "high" : "medium",
               actor);

      clutter_texture_set_filter_quality (CLUTTER_TEXTURE (actor), quality);
    }
}

int
main (int argc, char **argv)
{
  ClutterActor *stage, *image, *sub_image;
  CoglHandle texture, sub_texture;
  gfloat image_width, image_height;

  /* Initialize Clutter */
  if (clutter_init (NULL, NULL) != CLUTTER_INIT_SUCCESS)
    return 1;

  /* Get the default stage */
  stage = clutter_stage_get_default ();
  clutter_stage_set_title (CLUTTER_STAGE (stage), "Sub-texture");

  /* Create a new ClutterTexture that shows smiley.png */
  image = clutter_texture_new_from_file ("smiley.png", NULL);
  clutter_actor_get_size (image, &image_width, &image_height);
  clutter_actor_set_size (stage,
                          image_width * 3 / 2 + 30,
                          image_height + 20);

  /* Grab the CoglHandle of the underlying Cogl texture */
  texture = clutter_texture_get_cogl_texture (CLUTTER_TEXTURE (image));

  /* Create a new Cogl texture from the handle above. That new texture is a
   * rectangular region from image, more precisely the north ouest corner
   * of the image */
  sub_texture = cogl_texture_new_from_sub_texture (texture,
                                                   0, 0,
                                                   image_width / 2,
                                                   image_height / 2);

  /* Finally, use the newly created Cogl texture to feed a new ClutterTexture
   * and thus create a new actor that displays sub_texture */
   sub_image = clutter_texture_new ();
   clutter_texture_set_cogl_texture (CLUTTER_TEXTURE (sub_image), sub_texture);

  /*
   * You could have used the more straightforward g_object_new() function that
   * can create an object and set some properties on it at the same time:
   * sub_image = g_object_new (CLUTTER_TYPE_TEXTURE,
   *                           "cogl-texture", sub_texture,
   *                           NULL);
   */

  /* Put the original image at (10,10) and the new sub image next to it */
  clutter_actor_set_position (image, 10, 10);
  clutter_actor_set_position (sub_image, 20 + image_width, 10);

  /* Add both ClutterTexture to the stage */
  clutter_container_add (CLUTTER_CONTAINER (stage), image, sub_image, NULL);

  clutter_actor_show_all (stage);

  clutter_main ();

  return 0;
}

static void
impl_constructed (GObject *object)
{
    RBVisualizerPage *page;
    ClutterInitError err;
    GstElement *colorspace;
    GstElement *realsink;
    GstElement *capsfilter;
    GstCaps *caps;
    GstPad *pad;

    RB_CHAIN_GOBJECT_METHOD (rb_visualizer_page_parent_class, constructed, object);
    page = RB_VISUALIZER_PAGE (object);

    err = gtk_clutter_init (NULL, NULL);
    if (err != CLUTTER_INIT_SUCCESS) {
        /* maybe do something more sensible here.  not sure if there are any user-recoverable
         * conditions that would cause clutter init to fail, though, so it may not be worth it.
         * as it is, we just won't add the page to the page tree.
         */
        g_warning ("Unable to display visual effects due to Clutter init failure");
        return;
    }

    page->texture = clutter_texture_new ();
    clutter_texture_set_sync_size (CLUTTER_TEXTURE (page->texture), TRUE);
    clutter_texture_set_keep_aspect_ratio (CLUTTER_TEXTURE (page->texture), TRUE);

    page->sink = gst_bin_new (NULL);
    g_object_ref (page->sink);

    /* actual sink */
    realsink = gst_element_factory_make ("cluttersink", NULL);
    g_object_set (realsink, "texture", page->texture, NULL);

    colorspace = gst_element_factory_make ("ffmpegcolorspace", NULL);
    /* capsfilter to force rgb format (without this we end up using ayuv) */
    capsfilter = gst_element_factory_make ("capsfilter", NULL);
    caps = gst_caps_from_string ("video/x-raw-rgb,bpp=(int)24,depth=(int)24,"
                                 "endianness=(int)4321,red_mask=(int)16711680,"
                                 "green_mask=(int)65280,blue_mask=(int)255");
    g_object_set (capsfilter, "caps", caps, NULL);
    gst_caps_unref (caps);

    gst_bin_add_many (GST_BIN (page->sink), colorspace, capsfilter, realsink, NULL);
    gst_element_link (colorspace, capsfilter);
    gst_element_link (capsfilter, realsink);

    pad = gst_element_get_static_pad (colorspace, "sink");
    gst_element_add_pad (page->sink, gst_ghost_pad_new ("sink", pad));
    gst_object_unref (pad);

    g_signal_connect_object (page->fullscreen_action,
                             "toggled",
                             G_CALLBACK (toggle_fullscreen_cb),
                             page, 0);
}

static void
penge_magic_texture_paint (ClutterActor *actor)
{
  ClutterActorBox box;
  CoglHandle *material, *tex;
  float bw, bh;
  float aw, ah;
  float v;
  float tx1, tx2, ty1, ty2;
  guint8 alpha;

  clutter_actor_get_allocation_box (actor, &box);
  material = clutter_texture_get_cogl_material (CLUTTER_TEXTURE (actor));
  tex = clutter_texture_get_cogl_texture (CLUTTER_TEXTURE (actor));

  bw = (float) cogl_texture_get_width (tex); /* base texture width */
  bh = (float) cogl_texture_get_height (tex); /* base texture height */

  aw = (float) (box.x2 - box.x1); /* allocation width */
  ah = (float) (box.y2 - box.y1); /* allocation height */

  /* no comment */
  if ((float)bw/bh < (float)aw/ah)
  {
    /* fit width */
    v = (((float)ah * bw) / ((float)aw * bh)) / 2;
    tx1 = 0;
    tx2 = 1;
    ty1 = (0.5 - v);
    ty2 = (0.5 + v);
  } else {
    /* fit height */
    v = (((float)aw * bh) / ((float)ah * bw)) / 2;
    tx1 = (0.5 - v);
    tx2 = (0.5 + v);
    ty1 = 0;
    ty2 = 1;
  }

  alpha = clutter_actor_get_paint_opacity (actor);

  cogl_material_set_color4ub (material,
                              alpha,
                              alpha,
                              alpha,
                              alpha);

  cogl_set_source (material);
  cogl_rectangle_with_texture_coords (0, 0,
                                      aw, ah,
                                      tx1, ty1,
                                      tx2, ty2);
}

static void rc_update_pixbuf(void *renderer, gboolean lazy)
{
	RendererClutter *rc = (RendererClutter *)renderer;
	PixbufRenderer *pr = rc->pr;

	DEBUG_3("rc_update_pixbuf");

	rc_remove_pending_updates(rc);

	rc->last_pixbuf_change = g_get_monotonic_time();
	DEBUG_3("%s change time reset", get_exec_time());

	if (pr->pixbuf)
		{
		gint width = gdk_pixbuf_get_width(pr->pixbuf);
		gint height = gdk_pixbuf_get_height(pr->pixbuf);

		DEBUG_3("pixbuf size %d x %d (%d)", width, height, gdk_pixbuf_get_has_alpha(pr->pixbuf) ? 32 : 24);

		gint prev_width, prev_height;

		if (pr->stereo_data == STEREO_PIXBUF_SBS || pr->stereo_data == STEREO_PIXBUF_CROSS)
			{
			width /= 2;
			}


		clutter_texture_get_base_size(CLUTTER_TEXTURE(rc->texture), &prev_width, &prev_height);

		if (width != prev_width || height != prev_height)
			{
			/* FIXME use CoglMaterial with multiple textures for background, color management, anaglyph, ... */
			CoglHandle texture = cogl_texture_new_with_size(width,
									height,
									COGL_TEXTURE_NO_AUTO_MIPMAP | COGL_TEXTURE_NO_SLICING,
									gdk_pixbuf_get_has_alpha(pr->pixbuf) ? COGL_PIXEL_FORMAT_BGRA_8888 : COGL_PIXEL_FORMAT_BGR_888);

			if (texture != COGL_INVALID_HANDLE)
				{
				clutter_texture_set_cogl_texture(CLUTTER_TEXTURE(rc->texture), texture);
				cogl_handle_unref(texture);
				}
			}
		clutter_actor_set_clip(rc->texture, 0, 0, 0, 0); /* visible area is extended as area_changed events arrive */
		if (!lazy)
			{
			rc_area_changed(renderer, GET_RIGHT_PIXBUF_OFFSET(rc), 0, width, height);
			}
		}

	rc->clut_updated = FALSE;
}

static void
bg_filename_changed_cb (GConfClient *client,
                        guint        cnxn_id,
                        GConfEntry  *entry,
                        gpointer     userdata)
{
  PengeViewBackground *pvb = PENGE_VIEW_BACKGROUND (userdata);
  const gchar *filename;
  GConfValue *value;
  GError *error = NULL;

  value = gconf_entry_get_value (entry);

  if (value)
  {
    filename = gconf_value_get_string (value);
    if (!clutter_texture_set_from_file (CLUTTER_TEXTURE (pvb),
                                        filename,
                                        &error))
    {
      g_warning (G_STRLOC ": Error setting magic texture contents: %s",
                 error->message);
      g_clear_error (&error);
    } else {
      clutter_actor_set_opacity ((ClutterActor *)pvb, 0xff);
    }
  } else {
    /* If the key is unset let's just make ourselves invisible */
    clutter_actor_set_opacity ((ClutterActor *)pvb, 0x0);
  }
}

static void
_update_icon_from_icon_theme (PengeAppTile *tile)
{
  PengeAppTilePrivate *priv = GET_PRIVATE (tile);
  gchar *icon_path;
  GError *error = NULL;
  GIcon *icon;

  icon = g_app_info_get_icon (priv->app_info);

  if (G_IS_FILE_ICON (icon))
  {
    icon_path = g_icon_to_string (icon);
  }
  
  if (!clutter_texture_set_from_file (CLUTTER_TEXTURE (priv->tex),
                                      icon_path,
                                      &error))
  {
    g_warning (G_STRLOC ": Error loading texture from file: %s",
                error->message);
    g_clear_error (&error);
  }

  g_free (icon_path);
}

static void
clutter_gst_yv12_fp_paint (ClutterActor        *actor,
                             ClutterGstVideoSink *sink)
{
  ClutterGstVideoSinkPrivate *priv = sink->priv;
  CoglHandle material;

  material = clutter_texture_get_cogl_material (CLUTTER_TEXTURE (actor));

  /* Bind the U and V textures in layers 1 and 2 */
  if (priv->u_tex)
    cogl_material_set_layer (material, 1, priv->u_tex);
  if (priv->v_tex)
    cogl_material_set_layer (material, 2, priv->v_tex);

  /* Cogl doesn't support changing OpenGL state to modify how Cogl primitives
   * work, but it also doesn't support ARBfp which we currently depend on. For
   * now we at least ask Cogl to flush any batched primitives so we avoid
   * binding our shader across the wrong geometry, but there is a risk that
   * Cogl may start to use ARBfp internally which will conflict with us. */
  cogl_flush ();

  /* bind the shader */
  glEnable (GL_FRAGMENT_PROGRAM_ARB);
  priv->syms.glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, priv->fp);

}

ClutterActor *
mex_telepathy_channel_create_static_image (void)
{
  ClutterActor *actor;

  gchar *static_image_path;
  GError *error = NULL;

  static_image_path = g_build_filename (mex_get_data_dir (),
                                        "style",
                                        "thumb-call-pip-off.png",
                                        NULL);

  actor = clutter_texture_new_from_file (static_image_path,
                    &error);
  if (error)
  {
    g_warning ("Error loading texture %s", error->message);
    g_clear_error (&error);
  }

  if (static_image_path)
    g_free (static_image_path);

  clutter_texture_set_keep_aspect_ratio (CLUTTER_TEXTURE
                                         (actor), TRUE);

  return actor;
}

/* We want to preserve the aspect ratio by default, also the default
 * pipeline for an empty texture is full opacity white, which we
 * definitely don't want.  Skip that by setting 0 opacity.
 */
static ClutterTexture *
create_default_texture (void)
{
  ClutterTexture * texture = CLUTTER_TEXTURE (clutter_texture_new ());
  g_object_set (texture, "keep-aspect-ratio", TRUE, "opacity", 0, NULL);
  return texture;
}

/**
 * st_texture_cache_bind_cairo_surface_property:
 * @cache:
 * @object: A #GObject with a property @property_name of type #GdkPixbuf
 * @property_name: Name of a property
 *
 * Create a #ClutterTexture which tracks the #cairo_surface_t value of a GObject property
 * named by @property_name.  Unlike other methods in StTextureCache, the underlying
 * #CoglTexture is not shared by default with other invocations to this method.
 *
 * If the source object is destroyed, the texture will continue to show the last
 * value of the property.
 *
 * Return value: (transfer none): A new #ClutterActor
 */
ClutterActor *
st_texture_cache_bind_cairo_surface_property (StTextureCache    *cache,
                                              GObject           *object,
                                              const char        *property_name)
{
  ClutterTexture *texture;
  gchar *notify_key;
  StTextureCachePropertyBind *bind;

  texture = CLUTTER_TEXTURE (clutter_texture_new ());

  bind = g_new0 (StTextureCachePropertyBind, 1);
  bind->cache = cache;
  bind->texture = texture;
  bind->source = object;
  g_object_weak_ref (G_OBJECT (texture), st_texture_cache_bind_weak_notify, bind);
  bind->weakref_active = TRUE;

  st_texture_cache_reset_texture (bind, property_name);

  notify_key = g_strdup_printf ("notify::%s", property_name);
  bind->notify_signal_id = g_signal_connect_data (object, notify_key, G_CALLBACK(st_texture_cache_on_pixbuf_notify),
                                                  bind, (GClosureNotify)st_texture_cache_free_bind, 0);
  g_free (notify_key);

  return CLUTTER_ACTOR(texture);
}