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_vertical_line_draw PORTABLE C */
32 /* 6.1 */
33 /* AUTHOR */
34 /* */
35 /* Kenneth Maxwell, Microsoft Corporation */
36 /* */
37 /* DESCRIPTION */
38 /* */
39 /* Vertical line draw function for 1bpp display driver. */
40 /* */
41 /* INPUT */
42 /* */
43 /* context Drawing context */
44 /* ystart y-coord of top endpoint */
45 /* yend y-coord of bottom endpoint */
46 /* xpos x-coord of left edge */
47 /* width width of the line */
48 /* color Color of line to write */
49 /* */
50 /* OUTPUT */
51 /* */
52 /* None */
53 /* */
54 /* CALLS */
55 /* */
56 /* None */
57 /* */
58 /* CALLED BY */
59 /* */
60 /* GUIX Internal Code */
61 /* */
62 /* RELEASE HISTORY */
63 /* */
64 /* DATE NAME DESCRIPTION */
65 /* */
66 /* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */
67 /* 09-30-2020 Kenneth Maxwell Modified comment(s), */
68 /* resulting in version 6.1 */
69 /* */
70 /**************************************************************************/
_gx_display_driver_1bpp_vertical_line_draw(GX_DRAW_CONTEXT * context,INT ystart,INT yend,INT xpos,INT width,GX_COLOR color)71 VOID _gx_display_driver_1bpp_vertical_line_draw(GX_DRAW_CONTEXT *context, INT ystart, INT yend, INT xpos, INT width, GX_COLOR color)
72 {
73 INT row;
74 INT column;
75 GX_UBYTE *put;
76 GX_UBYTE *putrow;
77 GX_UBYTE mask;
78 INT stride;
79
80 /* Get row pitch in bytes. */
81 stride = (context -> gx_draw_context_pitch + 7) >> 3;
82
83 /* pick up starting address of canvas memory */
84 putrow = (GX_UBYTE *)context -> gx_draw_context_memory;
85 putrow += ystart * stride;
86 putrow += (xpos >> 3);
87
88 /* draw line from top to bottom */
89 for (row = ystart; row <= yend; row++)
90 {
91 put = putrow;
92
93 mask = (GX_UBYTE)(0x80 >> (xpos & 0x07));
94
95 /* draw line width from left to right */
96 for (column = 0; column < width; column++)
97 {
98 if (color == 0x00)
99 {
100 *put = (GX_UBYTE)((*put) & (~mask));
101 }
102 else if ((color == 0x01))
103 {
104 *put |= mask;
105 }
106
107 mask >>= 1;
108
109 if (!mask)
110 {
111 put++;
112 mask = 0x80;
113 }
114 }
115
116 /* advance to the next scaneline */
117 putrow += stride;
118 }
119 }
120
121
