C++ cairo_region_destroy函数代码示例

static void
pgd_selections_clear_selections (PgdSelectionsDemo *demo)
{
	demo->start.x = -1;

	if (demo->selection_surface) {
		cairo_surface_destroy (demo->selection_surface);
		demo->selection_surface = NULL;
	}

	if (demo->selection_region) {
		cairo_region_destroy (demo->selection_region);
		demo->selection_region = NULL;
	}

	if (demo->selected_text) {
		g_free (demo->selected_text);
		demo->selected_text = NULL;
	}

	if (demo->selected_region) {
		cairo_region_destroy (demo->selected_region);
		demo->selected_region = NULL;
	}
}

static gboolean
byzanz_recorder_snapshot (ByzanzRecorder *recorder)
{
  cairo_surface_t *surface;
  cairo_region_t *invalid;
  GTimeVal tv;

  if (!recorder->recording)
    return FALSE;

  if (recorder->next_image_source != 0)
    return FALSE;

  invalid = byzanz_recorder_get_invalid_region (recorder);
  if (cairo_region_is_empty (invalid)) {
    cairo_region_destroy (invalid);
    return FALSE;
  }

  surface = byzanz_recorder_create_snapshot (recorder, invalid);
  g_get_current_time (&tv);
  cairo_region_translate (invalid, -recorder->area.x, -recorder->area.y);

  g_signal_emit (recorder, signals[IMAGE], 0, surface, invalid, &tv);

  cairo_surface_destroy (surface);
  cairo_region_destroy (invalid);

  recorder->next_image_source = gdk_threads_add_timeout_full (G_PRIORITY_HIGH_IDLE,
      BYZANZ_RECORDER_FRAME_RATE_MS, byzanz_recorder_next_image, recorder, NULL);

  return TRUE;
}

static void
finalize(GObject *base)
{
	struct Private *priv = GET_PRIVATE(base);
	if (priv->area) {
		cairo_region_destroy(priv->area);
	}
	if (priv->expose) {
		cairo_region_destroy(priv->expose);
	}
	if (priv->rects) {
		g_array_free(priv->rects, TRUE);
	}
	JoyScreen *self = (JoyScreen *)base;
	GFX3D_Rect rect = {
		0, 0,
		joy_screen_get_width(self),
		joy_screen_get_height(self)
	};
	if (priv->display) {
		GFX3D_Display_ClearAlpha2D(priv->display, NULL, &rect,
				0., 0., 0., 0.);
		GFX3D_Display_Show_Partial(priv->display, &rect, 1, 1);
		GFX3D_Display_Destroy(priv->display);
	}
	if (priv->cursor) {
		GFX3D_Display_ClearAlpha2D(priv->cursor, NULL, &rect,
				0., 0., 0., 0.);
		GFX3D_Display_Show_Ch_Reload(priv->cursor);
		GFX3D_Cursor_Destroy(priv->cursor);
	}
	G_OBJECT_CLASS(joy_gfx3d_screen_parent_class)->finalize(base);
}

/* When there are multiple monitors with different resolutions, the visible area
 * within the root window may not be rectangular (it may have an L-shape, for
 * example).  In that case, mask out the areas of the root window which would
 * not be visible in the monitors, so that screenshot do not end up with content
 * that the user won't ever see.
 */
static void
mask_monitors (GdkPixbuf *pixbuf, GdkWindow *root_window)
{
  GdkScreen *screen;
  cairo_region_t *region_with_monitors;
  cairo_region_t *invisible_region;
  cairo_rectangle_int_t rect;

  screen = gdk_window_get_screen (root_window);

  region_with_monitors = make_region_with_monitors (screen);

  rect.x = 0;
  rect.y = 0;
  rect.width = gdk_screen_get_width (screen);
  rect.height = gdk_screen_get_height (screen);

  invisible_region = cairo_region_create_rectangle (&rect);
  cairo_region_subtract (invisible_region, region_with_monitors);

  blank_region_in_pixbuf (pixbuf, invisible_region);

  cairo_region_destroy (region_with_monitors);
  cairo_region_destroy (invisible_region);
}

void on_monitors_changed ( GdkScreen *screen,
			   gpointer   user_data) 
{
  GromitData *data = (GromitData *) user_data;

  if(data->debug)
    g_printerr("DEBUG: screen size changed!\n");

  // get new sizes
  data->width = gdk_screen_get_width (data->screen);
  data->height = gdk_screen_get_height (data->screen);

  // change size
  gtk_widget_set_size_request(GTK_WIDGET(data->win), data->width, data->height);
  // try to set transparent for input
  cairo_region_t* r =  cairo_region_create();
  gtk_widget_input_shape_combine_region(data->win, r);
  cairo_region_destroy(r);

  /* recreate the shape surface */
  cairo_surface_t *new_shape = cairo_image_surface_create(CAIRO_FORMAT_ARGB32 ,data->width, data->height);
  cairo_t *cr = cairo_create (new_shape);
  cairo_set_source_surface (cr, data->backbuffer, 0, 0);
  cairo_paint (cr);
  cairo_destroy (cr);
  cairo_surface_destroy(data->backbuffer);
  data->backbuffer = new_shape;
 
  /*
     these depend on the shape surface
  */
  GHashTableIter it;
  gpointer value;
  g_hash_table_iter_init (&it, data->tool_config);
  while (g_hash_table_iter_next (&it, NULL, &value)) 
    paint_context_free(value);
  g_hash_table_remove_all(data->tool_config);


  parse_config(data); // also calls paint_context_new() :-(


  data->default_pen = paint_context_new (data, GROMIT_PEN,
					 data->red, 7, 0, 1);
  data->default_eraser = paint_context_new (data, GROMIT_ERASER,
					    data->red, 75, 0, 1);

  if(!data->composited) // set shape
    {
      cairo_region_t* r = gdk_cairo_region_create_from_surface(data->backbuffer);
      gtk_widget_shape_combine_region(data->win, r);
      cairo_region_destroy(r);
    }

  setup_input_devices(data);


  gtk_widget_show_all (data->win);
}

/**
 * gsk_renderer_render:
 * @renderer: a #GskRenderer
 * @root: a #GskRenderNode
 * @region: (nullable): the #cairo_region_t that must be redrawn or %NULL
 *     for the whole window
 *
 * Renders the scene graph, described by a tree of #GskRenderNode instances,
 * ensuring that the given @region gets redrawn.
 *
 * Renderers must ensure that changes of the contents given by the @root
 * node as well as the area given by @region are redrawn. They are however
 * free to not redraw any pixel outside of @region if they can guarantee that
 * it didn't change.
 *
 * The @renderer will acquire a reference on the #GskRenderNode tree while
 * the rendering is in progress.
 */
void
gsk_renderer_render (GskRenderer          *renderer,
                     GskRenderNode        *root,
                     const cairo_region_t *region)
{
  GskRendererPrivate *priv = gsk_renderer_get_instance_private (renderer);
  cairo_region_t *clip;

  g_return_if_fail (GSK_IS_RENDERER (renderer));
  g_return_if_fail (priv->is_realized);
  g_return_if_fail (GSK_IS_RENDER_NODE (root));
  g_return_if_fail (priv->root_node == NULL);

  if (region == NULL || priv->prev_node == NULL || GSK_RENDERER_DEBUG_CHECK (renderer, FULL_REDRAW))
    {
      clip = cairo_region_create_rectangle (&(GdkRectangle) {
                                                0, 0,
                                                gdk_surface_get_width (priv->surface),
                                                gdk_surface_get_height (priv->surface)
                                            });
    }
  else
    {
      clip = cairo_region_copy (region);
      gsk_render_node_diff (priv->prev_node, root, clip);

      if (cairo_region_is_empty (clip))
        {
          cairo_region_destroy (clip);
          return;
        }
    }

  priv->root_node = gsk_render_node_ref (root);

  GSK_RENDERER_GET_CLASS (renderer)->render (renderer, root, clip);

#ifdef G_ENABLE_DEBUG
  if (GSK_RENDERER_DEBUG_CHECK (renderer, RENDERER))
    {
      GString *buf = g_string_new ("*** Frame stats ***\n\n");

      gsk_profiler_append_counters (priv->profiler, buf);
      g_string_append_c (buf, '\n');

      gsk_profiler_append_timers (priv->profiler, buf);
      g_string_append_c (buf, '\n');

      g_print ("%s\n***\n\n", buf->str);

      g_string_free (buf, TRUE);
    }
#endif

  g_clear_pointer (&priv->prev_node, gsk_render_node_unref);
  cairo_region_destroy (clip);
  priv->prev_node = priv->root_node;
  priv->root_node = NULL;
}

void
meta_tile_preview_show (MetaTilePreview *preview,
                        MetaRectangle   *tile_rect)
{
  GdkWindow *window;
  GdkRectangle old_rect;

  if (gtk_widget_get_visible (preview->preview_window)
      && preview->tile_rect.x == tile_rect->x
      && preview->tile_rect.y == tile_rect->y
      && preview->tile_rect.width == tile_rect->width
      && preview->tile_rect.height == tile_rect->height)
    return; /* nothing to do */

  gtk_widget_show (preview->preview_window);
  window = gtk_widget_get_window (preview->preview_window);
  meta_core_lower_beneath_grab_window (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()),
                                       GDK_WINDOW_XID (window),
                                       gtk_get_current_event_time ());

  old_rect.x = old_rect.y = 0;
  old_rect.width = preview->tile_rect.width;
  old_rect.height = preview->tile_rect.height;

  gdk_window_invalidate_rect (window, &old_rect, FALSE);

  preview->tile_rect = *tile_rect;

  gdk_window_move_resize (window,
                          preview->tile_rect.x, preview->tile_rect.y,
                          preview->tile_rect.width, preview->tile_rect.height);

  if (!preview->has_alpha)
    {
      cairo_region_t *outer_region, *inner_region;
      GdkRectangle outer_rect, inner_rect;
      GdkRGBA black = { 0.0, 0.0, 0.0, 1.0 };

      gdk_window_set_background_rgba (window, &black);

      outer_rect.x = outer_rect.y = 0;
      outer_rect.width = preview->tile_rect.width;
      outer_rect.height = preview->tile_rect.height;

      inner_rect.x = OUTLINE_WIDTH;
      inner_rect.y = OUTLINE_WIDTH;
      inner_rect.width = outer_rect.width - 2 * OUTLINE_WIDTH;
      inner_rect.height = outer_rect.height - 2 * OUTLINE_WIDTH;

      outer_region = cairo_region_create_rectangle (&outer_rect);
      inner_region = cairo_region_create_rectangle (&inner_rect);

      cairo_region_subtract (outer_region, inner_region);
      cairo_region_destroy (inner_region);

      gdk_window_shape_combine_region (window, outer_region, 0, 0);
      cairo_region_destroy (outer_region);
    }
}

static void
_draw_cursor_image (MetaCursorTracker     *tracker,
                    cairo_surface_t       *surface,
                    cairo_rectangle_int_t  area)
{
  CoglTexture *texture;
  int width, height;
  int stride;
  guint8 *data;
  cairo_surface_t *cursor_surface;
  cairo_region_t *screenshot_region;
  cairo_t *cr;
  int x, y;
  int xhot, yhot;

  screenshot_region = cairo_region_create_rectangle (&area);
  get_pointer_coords (&x, &y);

  if (!cairo_region_contains_point (screenshot_region, x, y))
    {
      cairo_region_destroy (screenshot_region);
      return;
    }

  texture = meta_cursor_tracker_get_sprite (tracker);
  meta_cursor_tracker_get_hot (tracker, &xhot, &yhot);
  width = cogl_texture_get_width (texture);
  height = cogl_texture_get_height (texture);
  stride = 4 * width;
  data = g_new (guint8, stride * height);
  cogl_texture_get_data (texture, CLUTTER_CAIRO_FORMAT_ARGB32, stride, data);

  /* FIXME: cairo-gl? */
  cursor_surface = cairo_image_surface_create_for_data (data,
                                                        CAIRO_FORMAT_ARGB32,
                                                        width, height,
                                                        stride);

  cr = cairo_create (surface);
  cairo_set_source_surface (cr,
                            cursor_surface,
                            x - xhot - area.x,
                            y - yhot - area.y);
  cairo_paint (cr);

  cairo_destroy (cr);
  cairo_surface_destroy (cursor_surface);
  cairo_region_destroy (screenshot_region);
  g_free (data);
}

static void
finalize(GObject *base)
{
    struct Private *priv = GET_PRIVATE(base);
    if (priv->expose) {
        cairo_region_destroy(priv->expose);
    }
    if (priv->area) {
        cairo_region_destroy(priv->area);
    }
    if (priv->surface) {
        cairo_surface_destroy(priv->surface);
    }
    G_OBJECT_CLASS(joy_gfx3d_window_parent_class)->finalize(base);
}

static void
update_shape_region (cairo_surface_t *surface,
		     WindowData      *windata)
{
	if (windata->width == windata->last_width && windata->height == windata->last_height)
	{
		return;
	}

	if (windata->width == 0 || windata->height == 0)
	{
		GtkAllocation allocation;
		gtk_widget_get_allocation (windata->win, &allocation);

		windata->width = MAX (allocation.width, 1);
		windata->height = MAX (allocation.height, 1);
	}

	if (!windata->composited) {
		cairo_region_t *region;

		region = gdk_cairo_region_create_from_surface (surface);
		gtk_widget_shape_combine_region (windata->win, region);
		cairo_region_destroy (region);
	} else {
		gtk_widget_shape_combine_region (windata->win, NULL);
		return;
	}

	windata->last_width = windata->width;
	windata->last_height = windata->height;
}

static void
cheese_flash_init (CheeseFlash *self)
{
  CheeseFlashPrivate *priv = CHEESE_FLASH_GET_PRIVATE (self);
  cairo_region_t *input_region;
  GtkWindow *window;
  GdkScreen *screen;

  priv->flash_timeout_tag = 0;
  priv->fade_timeout_tag  = 0;

  window = GTK_WINDOW (gtk_window_new (GTK_WINDOW_POPUP));

  /* make it so it doesn't look like a window on the desktop (+fullscreen) */
  gtk_window_set_decorated (window, FALSE);
  gtk_window_set_skip_taskbar_hint (window, TRUE);
  gtk_window_set_skip_pager_hint (window, TRUE);
  gtk_window_set_keep_above (window, TRUE);
  gtk_window_set_type_hint (window, GDK_WINDOW_TYPE_HINT_NOTIFICATION);

  /* Don't take focus */
  gtk_window_set_accept_focus (window, FALSE);
  gtk_window_set_focus_on_map (window, FALSE);

  /* Don't consume input */
  gtk_widget_realize (GTK_WIDGET (window));

  input_region = cairo_region_create ();
  gdk_window_input_shape_combine_region (gtk_widget_get_window (GTK_WIDGET (window)), input_region, 0, 0);
  cairo_region_destroy (input_region);

  g_signal_connect (G_OBJECT (window), "draw", G_CALLBACK (cheese_flash_window_draw_event_cb), NULL);
  priv->window = window;
}

static cairo_int_status_t
_cairo_gl_composite_setup_clipping (cairo_gl_composite_t *setup,
				    cairo_gl_context_t *ctx,
				    int vertex_size)
{

    if (! _cairo_gl_context_is_flushed (ctx) &&
	(! cairo_region_equal (ctx->clip_region, setup->clip_region) ||
	 ! _cairo_clip_equal (ctx->clip, setup->clip)))
	_cairo_gl_composite_flush (ctx);

    cairo_region_destroy (ctx->clip_region);
    ctx->clip_region = cairo_region_reference (setup->clip_region);
    _cairo_clip_destroy (ctx->clip);
    ctx->clip = _cairo_clip_copy (setup->clip);

    assert (!setup->clip_region || !setup->clip);

    if (ctx->clip_region) {
	_disable_stencil_buffer ();
	glEnable (GL_SCISSOR_TEST);
	return CAIRO_INT_STATUS_SUCCESS;
    }

    if (ctx->clip)
	return _cairo_gl_composite_setup_painted_clipping (setup, ctx,
							   vertex_size);

    _disable_stencil_buffer ();
    glDisable (GL_SCISSOR_TEST);
    return CAIRO_INT_STATUS_SUCCESS;
}

static cairo_status_t
_gl_flush (void *device)
{
    cairo_gl_context_t *ctx;
    cairo_status_t status;

    status = _cairo_gl_context_acquire (device, &ctx);
    if (unlikely (status))
        return status;

    _cairo_gl_composite_flush (ctx);

    _cairo_gl_context_destroy_operand (ctx, CAIRO_GL_TEX_SOURCE);
    _cairo_gl_context_destroy_operand (ctx, CAIRO_GL_TEX_MASK);

    if (ctx->clip_region) {
        cairo_region_destroy (ctx->clip_region);
        ctx->clip_region = NULL;
    }

    ctx->current_target = NULL;
    ctx->current_operator = -1;
    ctx->vertex_size = 0;
    ctx->pre_shader = NULL;
    _cairo_gl_set_shader (ctx, NULL);

    ctx->dispatch.BindBuffer (GL_ARRAY_BUFFER, 0);

    glDisable (GL_SCISSOR_TEST);
    glDisable (GL_BLEND);

    return _cairo_gl_context_release (ctx, status);
}

static gboolean on_draw(GtkWidget *widget, gpointer data)
{
    cairo_t *cr;
    GtkAllocation alloc;
    gtk_widget_get_allocation(widget, &alloc);
    gint width = alloc.width;
    gint height = alloc.height;
    gint r = 5;

    cr = gdk_cairo_create(gtk_widget_get_window(widget));
    cairo_surface_t *surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
                                                          width,
                                                          height);
    cairo_t *cr2 = cairo_create(surface);
    draw_round_rectangle(cr2, 0, 0, width, height, r);
    cairo_stroke_preserve(cr2);
    cairo_fill(cr2) ;
    cairo_destroy(cr2);

    cairo_region_t *region = gdk_cairo_region_create_from_surface(surface);
    gtk_widget_shape_combine_region(widget, region);

    cairo_set_line_width(cr, 0.3);
    cairo_set_source_rgb(cr, 0.78, 0.78, 0.78);
    draw_round_rectangle(cr, 0, 0, width, height, r);
    cairo_stroke(cr);

    cairo_region_destroy(region);
    cairo_surface_destroy(surface);
    cairo_destroy(cr);
}

static void
maybe_update_shape (GtkTooltip *tooltip)
{
  cairo_t *cr;
  cairo_surface_t *surface;
  cairo_region_t *region;

  /* fallback to XShape only for non-composited clients */
  if (gtk_widget_is_composited (tooltip->window))
    {
      gtk_widget_shape_combine_region (tooltip->window, NULL);
      return;
    }

  surface = gdk_window_create_similar_surface (gtk_widget_get_window (tooltip->window),
                                               CAIRO_CONTENT_COLOR_ALPHA,
                                               gtk_widget_get_allocated_width (tooltip->window),
                                               gtk_widget_get_allocated_height (tooltip->window));

  cr = cairo_create (surface);
  paint_background_and_frame (tooltip, cr);
  cairo_destroy (cr);

  region = gdk_cairo_region_create_from_surface (surface);
  gtk_widget_shape_combine_region (tooltip->window, region);

  cairo_surface_destroy (surface);
  cairo_region_destroy (region);
}