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 /** Scroll Wheel Management (Scroll Wheel) */
18 /** */
19 /**************************************************************************/
20
21 #define GX_SOURCE_CODE
22
23
24 /* Include necessary system files. */
25
26 #include "gx_api.h"
27 #include "gx_scroll_wheel.h"
28 #include "gx_system.h"
29 #include "gx_utility.h"
30 #include "gx_widget.h"
31
32 /**************************************************************************/
33 /* */
34 /* FUNCTION RELEASE */
35 /* */
36 /* _gx_scroll_wheel_gradient_create PORTABLE C */
37 /* 6.1.5 */
38 /* AUTHOR */
39 /* */
40 /* Kenneth Maxwell, Microsoft Corporation */
41 /* */
42 /* DESCRIPTION */
43 /* */
44 /* Create the gradient pixelmap used to overlay the scroll wheel */
45 /* widget drawing. */
46 /* */
47 /* INPUT */
48 /* */
49 /* wheel Scroll wheel control block */
50 /* */
51 /* OUTPUT */
52 /* */
53 /* status Completion status */
54 /* */
55 /* CALLS */
56 /* */
57 /* _gx_utility_gradient_create Create a gradient pixelmap */
58 /* _gx_utility_gradient_delete Delete a gradient */
59 /* */
60 /* CALLED BY */
61 /* */
62 /* GUIX Internal Code */
63 /* */
64 /* RELEASE HISTORY */
65 /* */
66 /* DATE NAME DESCRIPTION */
67 /* */
68 /* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */
69 /* 09-30-2020 Kenneth Maxwell Modified comment(s), */
70 /* resulting in version 6.1 */
71 /* 12-31-2020 Kenneth Maxwell Modified comment(s), added */
72 /* display rotation support, */
73 /* resulting in version 6.1.3 */
74 /* 03-02-2021 Kenneth Maxwell Modified comment(s), added */
75 /* flip rotation support, */
76 /* resulting in version 6.1.5 */
77 /* */
78 /**************************************************************************/
_gx_scroll_wheel_gradient_create(GX_SCROLL_WHEEL * wheel)79 VOID _gx_scroll_wheel_gradient_create(GX_SCROLL_WHEEL *wheel)
80 {
81 GX_UBYTE gradient_mode;
82 INT height;
83 GX_CANVAS *canvas;
84 GX_DISPLAY *display;
85
86 /* test to see if the scroll wheel has an alpha-mask overlay */
87 if (wheel -> gx_scroll_wheel_gradient.gx_gradient_alpha_start ||
88 wheel -> gx_scroll_wheel_gradient.gx_gradient_alpha_end)
89 {
90 /* yes, test to see if it has been created */
91 if (wheel -> gx_scroll_wheel_gradient.gx_gradient_pixelmap.gx_pixelmap_data == GX_NULL)
92 {
93 _gx_widget_canvas_get((GX_WIDGET *)wheel, &canvas);
94
95 if (canvas)
96 {
97 display = canvas -> gx_canvas_display;
98 gradient_mode = GX_GRADIENT_TYPE_MIRROR | GX_GRADIENT_TYPE_ALPHA;
99 height = wheel -> gx_widget_size.gx_rectangle_bottom - wheel -> gx_widget_size.gx_rectangle_top + 1;
100
101 if (display -> gx_display_rotation_angle == GX_SCREEN_ROTATION_NONE ||
102 display -> gx_display_rotation_angle == GX_SCREEN_ROTATION_FLIP)
103 {
104 _gx_utility_gradient_create(&wheel -> gx_scroll_wheel_gradient, 3, (GX_VALUE)height,
105 gradient_mode | GX_GRADIENT_TYPE_VERTICAL,
106 wheel -> gx_scroll_wheel_gradient.gx_gradient_alpha_start,
107 wheel -> gx_scroll_wheel_gradient.gx_gradient_alpha_end);
108 }
109 else
110 {
111 /* Generate rotated gradient map. */
112 _gx_utility_gradient_create(&wheel -> gx_scroll_wheel_gradient, (GX_VALUE)height, 3,
113 gradient_mode,
114 wheel -> gx_scroll_wheel_gradient.gx_gradient_alpha_start,
115 wheel -> gx_scroll_wheel_gradient.gx_gradient_alpha_end);
116
117 GX_SWAP_VALS(wheel -> gx_scroll_wheel_gradient.gx_gradient_pixelmap.gx_pixelmap_width,
118 wheel -> gx_scroll_wheel_gradient.gx_gradient_pixelmap.gx_pixelmap_height);
119 }
120 }
121 }
122 }
123 else
124 {
125 /* gradient is not used, if it has been created then delete it */
126 _gx_utility_gradient_delete(&wheel -> gx_scroll_wheel_gradient);
127 }
128 }
129
130
