C++ GIMP_ITEM函數代碼示例

static gboolean
gimp_bucket_fill_tool_initialize (GimpTool     *tool,
                                  GimpDisplay  *display,
                                  GError      **error)
{
  GimpImage    *image    = gimp_display_get_image (display);
  GimpDrawable *drawable = gimp_image_get_active_drawable (image);

  if (! GIMP_TOOL_CLASS (parent_class)->initialize (tool, display, error))
    {
      return FALSE;
    }

  if (gimp_viewable_get_children (GIMP_VIEWABLE (drawable)))
    {
      g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED,
			   _("Cannot modify the pixels of layer groups."));
      return FALSE;
    }

  if (gimp_item_is_content_locked (GIMP_ITEM (drawable)))
    {
      g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED,
			   _("The active layer's pixels are locked."));
      return FALSE;
    }

  if (! gimp_item_is_visible (GIMP_ITEM (drawable)))
    {
      g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED,
                           _("The active layer is not visible."));
      return FALSE;
    }

  return TRUE;
}

void
gimp_image_resize_to_selection (GimpImage    *image,
                                GimpContext  *context,
                                GimpProgress *progress)
{
  GimpChannel *selection = gimp_image_get_mask (image);
  gint         x, y, w, h;

  if (gimp_item_bounds (GIMP_ITEM (selection), &x, &y, &w, &h))
    {
      gimp_image_resize (image, context,
                         w, h, -x, -y,
                         progress);
    }
}

static void
gimp_viewable_dialog_name_changed (GimpObject         *object,
                                   GimpViewableDialog *dialog)
{
  gchar *name;

  name = gimp_viewable_get_description (GIMP_VIEWABLE (object), NULL);

  if (GIMP_IS_ITEM (object))
    {
      GimpImage *image = gimp_item_get_image (GIMP_ITEM (object));
      gchar     *tmp;

      tmp = name;
      name = g_strdup_printf ("%s-%d (%s)",
                              tmp,
                              gimp_item_get_ID (GIMP_ITEM (object)),
                              gimp_image_get_display_name (image));
      g_free (tmp);
    }

  gtk_label_set_text (GTK_LABEL (dialog->viewable_label), name);
  g_free (name);
}

static void
gimp_blend_tool_update_graph (GimpBlendTool *blend_tool)
{
  GimpTool *tool = GIMP_TOOL (blend_tool);
  gint      off_x, off_y;

  gimp_item_get_offset (GIMP_ITEM (tool->drawable), &off_x, &off_y);

#if 0
  if (gimp_blend_tool_is_shapeburst (blend_tool))
    {
      gfloat start, end;

      gegl_buffer_get (blend_tool->dist_buffer,
                       GEGL_RECTANGLE (blend_tool->start_x - off_x,
                                       blend_tool->start_y - off_y,
                                       1, 1),
                       1.0, babl_format("Y float"), &start,
                       GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);

      gegl_buffer_get (blend_tool->dist_buffer,
                       GEGL_RECTANGLE (blend_tool->end_x - off_x,
                                       blend_tool->end_y - off_y,
                                       1, 1),
                       1.0, babl_format("Y float"), &end,
                       GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);

      if (start != end)
        {
          gegl_node_set (blend_tool->subtract_node,
                         "value", (gdouble) start,
                         NULL);
          gegl_node_set (blend_tool->divide_node,
                         "value", (gdouble) (end - start),
                         NULL);
        }
    }
  else
#endif
    {
      gegl_node_set (blend_tool->render_node,
                     "start_x", blend_tool->start_x - off_x,
                     "start_y", blend_tool->start_y - off_y,
                     "end_x",   blend_tool->end_x - off_x,
                     "end_y",   blend_tool->end_y - off_y,
                     NULL);
    }
}

gboolean
gimp_paint_core_stroke (GimpPaintCore     *core,
                        GimpDrawable      *drawable,
                        GimpPaintOptions  *paint_options,
                        GimpCoords        *strokes,
                        gint               n_strokes,
                        gboolean           push_undo,
                        GError           **error)
{
  g_return_val_if_fail (GIMP_IS_PAINT_CORE (core), FALSE);
  g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), FALSE);
  g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), FALSE);
  g_return_val_if_fail (GIMP_IS_PAINT_OPTIONS (paint_options), FALSE);
  g_return_val_if_fail (strokes != NULL, FALSE);
  g_return_val_if_fail (n_strokes > 0, FALSE);
  g_return_val_if_fail (error == NULL || *error == NULL, FALSE);

  if (gimp_paint_core_start (core, drawable, paint_options, &strokes[0],
                             error))
    {
      gint i;

      core->last_coords = strokes[0];

      gimp_paint_core_paint (core, drawable, paint_options,
                             GIMP_PAINT_STATE_INIT, 0);

      gimp_paint_core_paint (core, drawable, paint_options,
                             GIMP_PAINT_STATE_MOTION, 0);

      for (i = 1; i < n_strokes; i++)
        {
          gimp_paint_core_interpolate (core, drawable, paint_options,
                                       &strokes[i], 0);
        }

      gimp_paint_core_paint (core, drawable, paint_options,
                             GIMP_PAINT_STATE_FINISH, 0);

      gimp_paint_core_finish (core, drawable, push_undo);

      gimp_paint_core_cleanup (core);

      return TRUE;
    }

  return FALSE;
}

void
gimp_item_get_preview_size (GimpViewable *viewable,
                            gint          size,
                            gboolean      is_popup,
                            gboolean      dot_for_dot,
                            gint         *width,
                            gint         *height)
{
  GimpItem  *item  = GIMP_ITEM (viewable);
  GimpImage *image = gimp_item_get_image (item);

  if (image && ! image->gimp->config->layer_previews && ! is_popup)
    {
      *width  = size;
      *height = size;
      return;
    }

  if (image && ! is_popup)
    {
      gdouble xres;
      gdouble yres;

      gimp_image_get_resolution (image, &xres, &yres);

      gimp_viewable_calc_preview_size (gimp_image_get_width  (image),
                                       gimp_image_get_height (image),
                                       size,
                                       size,
                                       dot_for_dot,
                                       xres,
                                       yres,
                                       width,
                                       height,
                                       NULL);
    }
  else
    {
      gimp_viewable_calc_preview_size (gimp_item_get_width  (item),
                                       gimp_item_get_height (item),
                                       size,
                                       size,
                                       dot_for_dot, 1.0, 1.0,
                                       width,
                                       height,
                                       NULL);
    }
}

void
select_actions_update (GimpActionGroup *group,
                       gpointer         data)
{
  GimpImage    *image    = action_data_get_image (data);
  GimpDrawable *drawable = NULL;
  gboolean      fs       = FALSE;
  gboolean      sel      = FALSE;
  gboolean      writable = FALSE;
  gboolean      children = FALSE;

  if (image)
    {
      drawable = gimp_image_get_active_drawable (image);

      if (drawable)
        {
          writable = ! gimp_item_is_content_locked (GIMP_ITEM (drawable));

          if (gimp_viewable_get_children (GIMP_VIEWABLE (drawable)))
            children = TRUE;
        }

      fs  = (gimp_image_get_floating_selection (image) != NULL);
      sel = ! gimp_channel_is_empty (gimp_image_get_mask (image));
    }

#define SET_SENSITIVE(action,condition) \
        gimp_action_group_set_action_sensitive (group, action, (condition) != 0)

  SET_SENSITIVE ("select-all",    drawable);
  SET_SENSITIVE ("select-none",   drawable && sel);
  SET_SENSITIVE ("select-invert", drawable);
  SET_SENSITIVE ("select-float",  writable && !children && sel);

  SET_SENSITIVE ("select-feather", drawable && sel);
  SET_SENSITIVE ("select-sharpen", drawable && sel);
  SET_SENSITIVE ("select-shrink",  drawable && sel);
  SET_SENSITIVE ("select-grow",    drawable && sel);
  SET_SENSITIVE ("select-border",  drawable && sel);
  SET_SENSITIVE ("select-flood",   drawable && sel);

  SET_SENSITIVE ("select-save",               drawable && !fs);
  SET_SENSITIVE ("select-stroke",             writable && !children && sel);
  SET_SENSITIVE ("select-stroke-last-values", writable && !children && sel);

#undef SET_SENSITIVE
}

static void
gimp_warp_tool_button_press (GimpTool            *tool,
                             const GimpCoords    *coords,
                             guint32              time,
                             GdkModifierType      state,
                             GimpButtonPressType  press_type,
                             GimpDisplay         *display)
{
  GimpWarpTool    *wt      = GIMP_WARP_TOOL (tool);
  GimpWarpOptions *options = GIMP_WARP_TOOL_GET_OPTIONS (wt);
  GeglNode        *new_op;
  gint             off_x, off_y;

  if (tool->display && display != tool->display)
    gimp_warp_tool_halt (wt);

  if (! tool->display)
    gimp_warp_tool_start (wt, display);

  wt->current_stroke = gegl_path_new ();

  new_op = gegl_node_new_child (NULL,
                                "operation", "gegl:warp",
                                "behavior",  options->behavior,
                                "strength",  options->effect_strength,
                                "size",      options->effect_size,
                                "hardness",  options->effect_hardness,
                                "stroke",    wt->current_stroke,
                                NULL);

  gimp_warp_tool_add_op (wt, new_op);
  g_object_unref (new_op);

  g_signal_connect (wt->current_stroke, "changed",
                    G_CALLBACK (gimp_warp_tool_stroke_changed),
                    wt);

  gimp_item_get_offset (GIMP_ITEM (tool->drawable), &off_x, &off_y);

  gegl_path_append (wt->current_stroke,
                    'M', coords->x - off_x, coords->y - off_y);

  wt->stroke_timer = g_timeout_add (STROKE_PERIOD,
                                    (GSourceFunc) gimp_warp_tool_stroke_timer,
                                    wt);

  gimp_tool_control_activate (tool->control);
}

TempBuf *
gimp_paint_core_get_paint_area (GimpPaintCore    *core,
                                GimpDrawable     *drawable,
                                GimpPaintOptions *paint_options,
                                const GimpCoords *coords)
{
  g_return_val_if_fail (GIMP_IS_PAINT_CORE (core), NULL);
  g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
  g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), NULL);
  g_return_val_if_fail (GIMP_IS_PAINT_OPTIONS (paint_options), NULL);
  g_return_val_if_fail (coords != NULL, NULL);

  return GIMP_PAINT_CORE_GET_CLASS (core)->get_paint_area (core, drawable,
                                                           paint_options,
                                                           coords);
}

void
vectors_duplicate_cmd_callback (GtkAction *action,
                                gpointer   data)
{
    GimpImage   *image;
    GimpVectors *vectors;
    GimpVectors *new_vectors;
    return_if_no_vectors (image, vectors, data);

    new_vectors =
        GIMP_VECTORS (gimp_item_duplicate (GIMP_ITEM (vectors),
                                           G_TYPE_FROM_INSTANCE (vectors),
                                           TRUE));
    gimp_image_add_vectors (image, new_vectors, -1);
    gimp_image_flush (image);
}

void
vectors_stroke_cmd_callback (GtkAction *action,
                             gpointer   data)
{
  GimpImage   *image;
  GimpVectors *vectors;
  return_if_no_vectors (image, vectors, data);

  items_stroke_cmd_callback (action,
                             image, GIMP_ITEM (vectors),
                             "gimp-vectors-stroke-dialog",
                             _("Stroke Path"),
                             GIMP_ICON_PATH_STROKE,
                             GIMP_HELP_PATH_STROKE,
                             data);
}

void
gimp_channel_combine_rect (GimpChannel    *mask,
                           GimpChannelOps  op,
                           gint            x,
                           gint            y,
                           gint            w,
                           gint            h)
{
  GeglBuffer *buffer;

  g_return_if_fail (GIMP_IS_CHANNEL (mask));

  buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (mask));

  if (! gimp_gegl_mask_combine_rect (buffer, op, x, y, w, h))
    return;

  gimp_rectangle_intersect (x, y, w, h,
                            0, 0,
                            gimp_item_get_width  (GIMP_ITEM (mask)),
                            gimp_item_get_height (GIMP_ITEM (mask)),
                            &x, &y, &w, &h);

  /*  Determine new boundary  */
  if (mask->bounds_known && (op == GIMP_CHANNEL_OP_ADD) && ! mask->empty)
    {
      if (x < mask->x1)
        mask->x1 = x;
      if (y < mask->y1)
        mask->y1 = y;
      if ((x + w) > mask->x2)
        mask->x2 = (x + w);
      if ((y + h) > mask->y2)
        mask->y2 = (y + h);
    }
  else if (op == GIMP_CHANNEL_OP_REPLACE || mask->empty)
    {
      mask->empty = FALSE;
      mask->x1    = x;
      mask->y1    = y;
      mask->x2    = x + w;
      mask->y2    = y + h;
    }
  else
    {
      mask->bounds_known = FALSE;
    }

  mask->x1 = CLAMP (mask->x1, 0, gimp_item_get_width  (GIMP_ITEM (mask)));
  mask->y1 = CLAMP (mask->y1, 0, gimp_item_get_height (GIMP_ITEM (mask)));
  mask->x2 = CLAMP (mask->x2, 0, gimp_item_get_width  (GIMP_ITEM (mask)));
  mask->y2 = CLAMP (mask->y2, 0, gimp_item_get_height (GIMP_ITEM (mask)));

  gimp_drawable_update (GIMP_DRAWABLE (mask), x, y, w, h);
}

void
vectors_fill_cmd_callback (GtkAction *action,
                           gpointer   data)
{
  GimpImage   *image;
  GimpVectors *vectors;
  return_if_no_vectors (image, vectors, data);

  items_fill_cmd_callback (action,
                           image, GIMP_ITEM (vectors),
                           "gimp-vectors-fill-dialog",
                           _("Fill Path"),
                           GIMP_ICON_TOOL_BUCKET_FILL,
                           GIMP_HELP_PATH_FILL,
                           data);
}

static void
offset_half_xy_callback (GtkWidget    *widget,
                         OffsetDialog *dialog)
{
  GimpImage *image = dialog->image;

  if (image)
    {
      GimpItem *item = GIMP_ITEM (gimp_image_get_active_drawable (image));

      gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (dialog->off_se),
                                  0, gimp_item_get_width (item) / 2);
      gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (dialog->off_se),
                                  1, gimp_item_get_height (item) / 2);
   }
}

void
gimp_drawable_curves_spline (GimpDrawable *drawable,
                             GimpProgress *progress,
                             gint32        channel,
                             const guint8 *points,
                             gint          n_points)
{
  GimpCurvesConfig *config;
  GimpCurve        *curve;
  gint              i;

  g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
  g_return_if_fail (! gimp_drawable_is_indexed (drawable));
  g_return_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)));
  g_return_if_fail (channel >= GIMP_HISTOGRAM_VALUE &&
                    channel <= GIMP_HISTOGRAM_ALPHA);

  if (channel == GIMP_HISTOGRAM_ALPHA)
    g_return_if_fail (gimp_drawable_has_alpha (drawable));

  if (gimp_drawable_is_gray (drawable))
    g_return_if_fail (channel == GIMP_HISTOGRAM_VALUE ||
                      channel == GIMP_HISTOGRAM_ALPHA);

  config = g_object_new (GIMP_TYPE_CURVES_CONFIG, NULL);

  curve = config->curve[channel];

  gimp_data_freeze (GIMP_DATA (curve));

  /* FIXME: create a curves object with the right number of points */
  /*  unset the last point  */
  gimp_curve_set_point (curve, curve->n_points - 1, -1, -1);

  n_points = MIN (n_points / 2, curve->n_points);

  for (i = 0; i < n_points; i++)
    gimp_curve_set_point (curve, i,
                          (gdouble) points[i * 2]     / 255.0,
                          (gdouble) points[i * 2 + 1] / 255.0);

  gimp_data_thaw (GIMP_DATA (curve));

  gimp_drawable_curves (drawable, progress, config);

  g_object_unref (config);
}