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 #define GX_SOURCE_CODE
21
22
23 /* Include necessary system files. */
24
25 #include "gx_api.h"
26 #include "gx_display.h"
27
28 /**************************************************************************/
29 /* */
30 /* FUNCTION RELEASE */
31 /* */
32 /* _gx_display_driver_16bpp_vertical_pattern_line_draw */
33 /* PORTABLE C */
34 /* 6.3.0 */
35 /* AUTHOR */
36 /* */
37 /* Kenneth Maxwell, Microsoft Corporation */
38 /* */
39 /* DESCRIPTION */
40 /* */
41 /* Generic 16bpp color format vertical pattern line draw function. */
42 /* */
43 /* INPUT */
44 /* */
45 /* context Drawing context */
46 /* ystart y-coord of top endpoint */
47 /* yend y-coord of bottom endpoint */
48 /* xpos x-coord of left edge */
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 /* 10-31-2023 Ting Zhu Modified comment(s), */
70 /* added partial canvas buffer */
71 /* support, */
72 /* resulting in version 6.3.0 */
73 /* */
74 /**************************************************************************/
_gx_display_driver_16bpp_vertical_pattern_line_draw(GX_DRAW_CONTEXT * context,INT ystart,INT yend,INT xpos)75 VOID _gx_display_driver_16bpp_vertical_pattern_line_draw(GX_DRAW_CONTEXT *context, INT ystart, INT yend, INT xpos)
76 {
77 INT row;
78 USHORT *put;
79 USHORT *rowstart;
80 ULONG pattern;
81 ULONG mask;
82 USHORT on_color;
83 USHORT off_color;
84
85 INT len = yend - ystart + 1;
86
87 /* pick up starting address of canvas memory */
88 rowstart = (USHORT *)context -> gx_draw_context_memory;
89
90 GX_CALCULATE_PUTROW(rowstart, xpos, ystart, context);
91
92 /* pick up the requested pattern and mask */
93 pattern = context -> gx_draw_context_brush.gx_brush_line_pattern;
94 mask = context -> gx_draw_context_brush.gx_brush_pattern_mask;
95 on_color = (USHORT)context -> gx_draw_context_brush.gx_brush_line_color;
96 off_color = (USHORT)context -> gx_draw_context_brush.gx_brush_fill_color;
97
98 /* draw line from top to bottom */
99 for (row = 0; row < len; row++)
100 {
101 put = rowstart;
102
103 if (pattern & mask)
104 {
105 *put = on_color;
106 }
107 else
108 {
109 *put = off_color;
110 }
111
112 mask >>= 1;
113 if (!mask)
114 {
115 mask = 0x80000000;
116 }
117
118 /* advance to the next scaneline */
119 rowstart += context -> gx_draw_context_pitch;
120 }
121 /* save current masks value back to brush */
122 context -> gx_draw_context_brush.gx_brush_pattern_mask = mask;
123 }
124
125
