自学教程：C++ GIMP_IS_DRAW_TOOL函数代码示例

voidgimp_draw_tool_resume (GimpDrawTool *draw_tool){  g_return_if_fail (GIMP_IS_DRAW_TOOL (draw_tool));  g_return_if_fail (draw_tool->paused_count > 0);  draw_tool->paused_count--;  if (draw_tool->paused_count == 0)    {#ifdef USE_TIMEOUT      /* Don't install the timeout if the draw tool isn't active, so       * suspend()/resume() can always be called, and have no side       * effect on an inactive tool. See bug #687851.       */      if (gimp_draw_tool_is_active (draw_tool) && ! draw_tool->draw_timeout)        {          draw_tool->draw_timeout =            gdk_threads_add_timeout_full (G_PRIORITY_HIGH_IDLE,                                          DRAW_TIMEOUT,                                          (GSourceFunc) gimp_draw_tool_draw_timeout,                                          draw_tool, NULL);        }#endif      /* call draw() anyway, it will do nothing if the timeout is       * running, but will additionally check the drawing times to       * ensure the minimum framerate       */      gimp_draw_tool_draw (draw_tool);    }}

voidgimp_draw_tool_start (GimpDrawTool *draw_tool,                      GimpDisplay  *display){  g_return_if_fail (GIMP_IS_DRAW_TOOL (draw_tool));  g_return_if_fail (GIMP_IS_DISPLAY (display));#ifdef STRICT_TOOL_CHECKS  g_return_if_fail (gimp_draw_tool_is_active (draw_tool) == FALSE);#else  gimp_draw_tool_stop (draw_tool);#endif  draw_tool->display = display;  gimp_draw_tool_draw (draw_tool);}

GimpCanvasItem *gimp_draw_tool_add_path (GimpDrawTool         *draw_tool,                         const GimpBezierDesc *desc){  GimpCanvasItem *item;  g_return_val_if_fail (GIMP_IS_DRAW_TOOL (draw_tool), NULL);  g_return_val_if_fail (desc != NULL, NULL);  item = gimp_canvas_path_new (gimp_display_get_shell (draw_tool->display),                               desc, FALSE, FALSE);  gimp_draw_tool_add_item (draw_tool, item);  g_object_unref (item);  return item;}

voidgimp_draw_tool_add_item (GimpDrawTool   *draw_tool,                         GimpCanvasItem *item){  GimpCanvasGroup *group;  g_return_if_fail (GIMP_IS_DRAW_TOOL (draw_tool));  g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));  if (! draw_tool->item)    draw_tool->item = gimp_canvas_group_new (gimp_display_get_shell (draw_tool->display));  group = GIMP_CANVAS_GROUP (draw_tool->item);  if (draw_tool->group_stack)    group = draw_tool->group_stack->data;  gimp_canvas_group_add_item (group, item);}

static voidgimp_guide_tool_button_release (GimpTool              *tool,                                const GimpCoords      *coords,                                guint32                time,                                GdkModifierType        state,                                GimpButtonReleaseType  release_type,                                GimpDisplay           *display){  GimpGuideTool    *guide_tool = GIMP_GUIDE_TOOL (tool);  GimpDisplayShell *shell      = gimp_display_get_shell (display);  GimpImage        *image      = gimp_display_get_image (display);  gimp_tool_pop_status (tool, display);  gimp_tool_control_halt (tool->control);  gimp_draw_tool_stop (GIMP_DRAW_TOOL (tool));  if (release_type == GIMP_BUTTON_RELEASE_CANCEL)    {      /* custom guides are moved live */      if (guide_tool->guide_custom)        gimp_image_move_guide (image, guide_tool->guide,                               guide_tool->guide_old_position, TRUE);    }  else    {      gint max_position;      if (guide_tool->guide_orientation == GIMP_ORIENTATION_HORIZONTAL)        max_position = gimp_image_get_height (image);      else        max_position = gimp_image_get_width (image);      if (guide_tool->guide_position == GIMP_GUIDE_POSITION_UNDEFINED ||          guide_tool->guide_position <  0                             ||          guide_tool->guide_position > max_position)        {          if (guide_tool->guide)            {              gimp_image_remove_guide (image, guide_tool->guide, TRUE);              guide_tool->guide = NULL;            }        }      else        {          if (guide_tool->guide)            {              /* custom guides are moved live */              if (! guide_tool->guide_custom)                gimp_image_move_guide (image, guide_tool->guide,                                       guide_tool->guide_position, TRUE);            }          else            {              switch (guide_tool->guide_orientation)                {                case GIMP_ORIENTATION_HORIZONTAL:                  guide_tool->guide =                    gimp_image_add_hguide (image,                                           guide_tool->guide_position,                                           TRUE);                  break;                case GIMP_ORIENTATION_VERTICAL:                  guide_tool->guide =                    gimp_image_add_vguide (image,                                           guide_tool->guide_position,                                           TRUE);                  break;                default:                  gimp_assert_not_reached ();                }            }        }      gimp_image_flush (image);    }  gimp_display_shell_selection_resume (shell);  guide_tool->guide_position    = GIMP_GUIDE_POSITION_UNDEFINED;  guide_tool->guide_orientation = GIMP_ORIENTATION_UNKNOWN;  tool_manager_pop_tool (display->gimp);  g_object_unref (guide_tool);  {    GimpTool *active_tool = tool_manager_get_active (display->gimp);    if (GIMP_IS_DRAW_TOOL (active_tool))      gimp_draw_tool_pause (GIMP_DRAW_TOOL (active_tool));    tool_manager_oper_update_active (display->gimp, coords, state,                                     TRUE, display);    tool_manager_cursor_update_active (display->gimp, coords, state,                                       display);    if (GIMP_IS_DRAW_TOOL (active_tool))//.........这里部分代码省略.........