1 /**************************************************************************/
2 /*                                                                        */
3 /*       Copyright (c) Microsoft Corporation. All rights reserved.        */
4 /*                                                                        */
5 /*       This software is licensed under the Microsoft Software License   */
6 /*       Terms for Microsoft Azure RTOS. Full text of the license can be  */
7 /*       found in the LICENSE file at https://aka.ms/AzureRTOS_EULA       */
8 /*       and in the root directory of this software.                      */
9 /*                                                                        */
10 /**************************************************************************/
11 
12 
13 /**************************************************************************/
14 /**************************************************************************/
15 /**                                                                       */
16 /** GUIX Component                                                        */
17 /**                                                                       */
18 /**   Widget Management (Widget)                                          */
19 /**                                                                       */
20 /**************************************************************************/
21 
22 #define GX_SOURCE_CODE
23 
24 
25 /* Include necessary system files.  */
26 
27 #include "gx_api.h"
28 #include "gx_widget.h"
29 #include "gx_window.h"
30 #include "gx_system.h"
31 
32 /**************************************************************************/
33 /*                                                                        */
34 /*  FUNCTION                                               RELEASE        */
35 /*                                                                        */
36 /*    _gx_widget_canvas_get                               PORTABLE C      */
37 /*                                                           6.1          */
38 /*  AUTHOR                                                                */
39 /*                                                                        */
40 /*    Kenneth Maxwell, Microsoft Corporation                              */
41 /*                                                                        */
42 /*  DESCRIPTION                                                           */
43 /*                                                                        */
44 /*    This service gets the widget canvas.                                */
45 /*                                                                        */
46 /*  INPUT                                                                 */
47 /*                                                                        */
48 /*    widget                                Pointer to widget             */
49 /*    return_canvas                         Pointer to destination for    */
50 /*                                          widget's canvas               */
51 /*                                                                        */
52 /*  OUTPUT                                                                */
53 /*                                                                        */
54 /*    status                                Completion status             */
55 /*                                                                        */
56 /*  CALLS                                                                 */
57 /*                                                                        */
58 /*    _gx_window_root_find                  Find the root window          */
59 /*                                                                        */
60 /*  CALLED BY                                                             */
61 /*                                                                        */
62 /*    Application Code                                                    */
63 /*    GUIX Internal Code                                                  */
64 /*                                                                        */
65 /*  RELEASE HISTORY                                                       */
66 /*                                                                        */
67 /*    DATE              NAME                      DESCRIPTION             */
68 /*                                                                        */
69 /*  05-19-2020     Kenneth Maxwell          Initial Version 6.0           */
70 /*  09-30-2020     Kenneth Maxwell          Modified comment(s),          */
71 /*                                            resulting in version 6.1    */
72 /*                                                                        */
73 /**************************************************************************/
_gx_widget_canvas_get(GX_WIDGET * widget,GX_CANVAS ** return_canvas)74 UINT _gx_widget_canvas_get(GX_WIDGET *widget, GX_CANVAS **return_canvas)
75 {
76 GX_WINDOW_ROOT  *root;
77 GX_DRAW_CONTEXT *context;
78 UINT             status;
79 
80     status = _gx_window_root_find(widget, &root);
81 
82     if (status == GX_SUCCESS)
83     {
84         *return_canvas = root -> gx_window_root_canvas;
85     }
86     else
87     {
88         context = _gx_system_current_draw_context;
89         if (context)
90         {
91             *return_canvas = context -> gx_draw_context_canvas;
92             status = GX_SUCCESS;
93         }
94         else
95         {
96             *return_canvas = GX_NULL;
97         }
98     }
99 
100     return(status);
101 }
102 
103