1 /***************************************************************************
2  * Copyright (c) 2024 Microsoft Corporation
3  *
4  * This program and the accompanying materials are made available under the
5  * terms of the MIT License which is available at
6  * https://opensource.org/licenses/MIT.
7  *
8  * SPDX-License-Identifier: MIT
9  **************************************************************************/
10 
11 
12 /**************************************************************************/
13 /**************************************************************************/
14 /**                                                                       */
15 /** GUIX Component                                                        */
16 /**                                                                       */
17 /**   PIXELMAP Management (PIXELMAP)                                      */
18 /**                                                                       */
19 /**************************************************************************/
20 
21 #define GX_SOURCE_CODE
22 
23 /* Include necessary system files.  */
24 
25 #include "gx_api.h"
26 #include "gx_widget.h"
27 
28 
29 /**************************************************************************/
30 /*                                                                        */
31 /*  FUNCTION                                               RELEASE        */
32 /*                                                                        */
33 /*    _gx_widget_transparent_pixelmap_detect              PORTABLE C      */
34 /*                                                           6.1          */
35 /*  AUTHOR                                                                */
36 /*                                                                        */
37 /*    Kenneth Maxwell, Microsoft Corporation                              */
38 /*                                                                        */
39 /*  DESCRIPTION                                                           */
40 /*                                                                        */
41 /*    This function detects whether or not a pixelmap contains            */
42 /*    transparency.                                                       */
43 /*                                                                        */
44 /*  INPUT                                                                 */
45 /*                                                                        */
46 /*    pixelmap_id                           Pixelmap ID                   */
47 /*                                                                        */
48 /*  OUTPUT                                                                */
49 /*                                                                        */
50 /*    GX_TRUE or GX_FALSE                                                 */
51 /*                                                                        */
52 /*  CALLS                                                                 */
53 /*                                                                        */
54 /*    _gx_widget_canvas_get                 Retrieve canvas               */
55 /*                                                                        */
56 /*                                                                        */
57 /*  CALLED BY                                                             */
58 /*                                                                        */
59 /*    Application Code                                                    */
60 /*                                                                        */
61 /*  RELEASE HISTORY                                                       */
62 /*                                                                        */
63 /*    DATE              NAME                      DESCRIPTION             */
64 /*                                                                        */
65 /*  05-19-2020     Kenneth Maxwell          Initial Version 6.0           */
66 /*  09-30-2020     Kenneth Maxwell          Modified comment(s),          */
67 /*                                            resulting in version 6.1    */
68 /*                                                                        */
69 /**************************************************************************/
_gx_widget_transparent_pixelmap_detect(GX_WIDGET * widget,GX_RESOURCE_ID pixelmap_id)70 GX_BOOL _gx_widget_transparent_pixelmap_detect(GX_WIDGET *widget, GX_RESOURCE_ID pixelmap_id)
71 {
72 GX_PIXELMAP *map;
73 GX_CANVAS   *canvas;
74 GX_DISPLAY  *display;
75 
76     if (widget -> gx_widget_status & GX_STATUS_VISIBLE)
77     {
78         _gx_widget_canvas_get(widget, &canvas);
79 
80         if (canvas)
81         {
82             display = canvas -> gx_canvas_display;
83 
84             if (pixelmap_id < display -> gx_display_pixelmap_table_size)
85             {
86                 map = display -> gx_display_pixelmap_table[pixelmap_id];
87 
88                 if (map)
89                 {
90                     if (map -> gx_pixelmap_flags & (GX_PIXELMAP_TRANSPARENT | GX_PIXELMAP_ALPHA))
91                     {
92                         return GX_TRUE;
93                     }
94                 }
95             }
96         }
97     }
98     return GX_FALSE;
99 }
100 
101