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 /** Display Management (Display) */
19 /** */
20 /**************************************************************************/
21
22 #define GX_SOURCE_CODE
23
24 /* Include necessary system files. */
25
26 #include "gx_api.h"
27 #include "gx_display.h"
28
29 /**************************************************************************/
30 /* */
31 /* FUNCTION RELEASE */
32 /* */
33 /* _gx_display_driver_1bpp_horizontal_line_draw PORTABLE C */
34 /* 6.1 */
35 /* AUTHOR */
36 /* */
37 /* Kenneth Maxwell, Microsoft Corporation */
38 /* */
39 /* DESCRIPTION */
40 /* */
41 /* Horizontal line draw function for 1bpp display driver. */
42 /* */
43 /* INPUT */
44 /* */
45 /* context Drawing context */
46 /* xstart x-coord of left endpoint */
47 /* xend x-coord of right endpoint */
48 /* ypos y-coord of line top */
49 /* width Width (height) of the line */
50 /* color Color of line to write */
51 /* */
52 /* OUTPUT */
53 /* */
54 /* None */
55 /* */
56 /* CALLS */
57 /* */
58 /* None */
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 /* */
72 /**************************************************************************/
_gx_display_driver_1bpp_horizontal_line_draw(GX_DRAW_CONTEXT * context,INT xstart,INT xend,INT ypos,INT width,GX_COLOR color)73 VOID _gx_display_driver_1bpp_horizontal_line_draw(GX_DRAW_CONTEXT *context, INT xstart, INT xend, INT ypos, INT width, GX_COLOR color)
74 {
75 INT row;
76 INT column;
77 GX_UBYTE *put;
78 GX_UBYTE *putrow;
79 GX_UBYTE mask;
80 INT stride;
81
82 /* Get row pitch in bytes. */
83 stride = (context -> gx_draw_context_pitch + 7) >> 3;
84
85 /* pick up start address of canvas memory */
86 putrow = (GX_UBYTE *)context -> gx_draw_context_memory;
87 putrow += ypos * stride;
88 putrow += (xstart >> 3);
89
90 for (row = 0; row < width; row++)
91 {
92 put = putrow;
93
94 mask = (GX_UBYTE)(0x80 >> (xstart & 0x07));
95
96 column = xstart;
97 while (column <= xend)
98 {
99 if ((mask == 0x80) && (xend - column + 1 >= 8))
100 {
101 while (xend - column + 1 >= 8)
102 {
103 if (color == 0x00)
104 {
105 *put++ = 0x00;
106 }
107 else if (color == 0x01)
108 {
109 *put++ = 0xff;
110 }
111
112 column += 8;
113 }
114 }
115 else
116 {
117 if (color == 0x00)
118 {
119 *put = (GX_UBYTE)((*put) & (~mask));
120 }
121 else if (color == 0x01)
122 {
123 *put |= mask;
124 }
125
126 mask >>= 1;
127
128 if (mask == 0)
129 {
130 put++;
131 mask = 0x80;
132 }
133
134 column++;
135 }
136 }
137
138 putrow += stride;
139 }
140 }
141
142
