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 /**   Display Management (Display)                                        */
18 /**                                                                       */
19 /**************************************************************************/
20 
21 #define GX_SOURCE_CODE
22 
23 /* Include necessary system files.  */
24 
25 #include "gx_api.h"
26 #include "gx_display.h"
27 /**************************************************************************/
28 /*                                                                        */
29 /*  FUNCTION                                               RELEASE        */
30 /*                                                                        */
31 /*    _gx_display_driver_1bpp_pixel_write                 PORTABLE C      */
32 /*                                                           6.1          */
33 /*  AUTHOR                                                                */
34 /*                                                                        */
35 /*    Kenneth Maxwell, Microsoft Corporation                              */
36 /*                                                                        */
37 /*  DESCRIPTION                                                           */
38 /*                                                                        */
39 /*    Pixel write function for the 1bpp display driver.                   */
40 /*                                                                        */
41 /*  INPUT                                                                 */
42 /*                                                                        */
43 /*    context                               Drawing context               */
44 /*    x                                     X coordinate                  */
45 /*    y                                     Y coordinate                  */
46 /*    color                                 Color of pixel to write       */
47 /*                                                                        */
48 /*  OUTPUT                                                                */
49 /*                                                                        */
50 /*    None                                                                */
51 /*                                                                        */
52 /*  CALLS                                                                 */
53 /*                                                                        */
54 /*    None                                                                */
55 /*                                                                        */
56 /*  CALLED BY                                                             */
57 /*                                                                        */
58 /*    GUIX Internal Code                                                  */
59 /*                                                                        */
60 /*  RELEASE HISTORY                                                       */
61 /*                                                                        */
62 /*    DATE              NAME                      DESCRIPTION             */
63 /*                                                                        */
64 /*  05-19-2020     Kenneth Maxwell          Initial Version 6.0           */
65 /*  09-30-2020     Kenneth Maxwell          Modified comment(s),          */
66 /*                                            resulting in version 6.1    */
67 /*                                                                        */
68 /**************************************************************************/
_gx_display_driver_1bpp_pixel_write(GX_DRAW_CONTEXT * context,INT x,INT y,GX_COLOR color)69 VOID _gx_display_driver_1bpp_pixel_write(GX_DRAW_CONTEXT *context, INT x, INT y, GX_COLOR color)
70 {
71 GX_UBYTE *put = (GX_UBYTE *)context -> gx_draw_context_memory;
72 GX_UBYTE  mask;
73 UINT      stride;
74 
75     /* Get row pitch in bytes. */
76     stride = _gx_display_driver_1bpp_row_pitch_get((USHORT)(context -> gx_draw_context_pitch));
77 
78     /* Calculate address of writing byte.  */
79     put = (GX_UBYTE *)((INT)put + y * (INT)stride);
80     put += x >> 3;
81 
82     mask = (GX_UBYTE)(0x80 >> (x & 0x07));
83 
84     /* Write the pixel value.  */
85     if (color == 0x00)
86     {
87         *put = (GX_UBYTE)(*put & (~mask));
88     }
89     else if (color == 0x01)
90     {
91         *put |= mask;
92     }
93 }
94 
95