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_rotated_vertical_line_draw PORTABLE C */
33 /* 6.1.3 */
34 /* AUTHOR */
35 /* */
36 /* Kenneth Maxwell, Microsoft Corporation */
37 /* */
38 /* DESCRIPTION */
39 /* */
40 /* Generic vertical line draw function for 16bpp canvas. */
41 /* */
42 /* INPUT */
43 /* */
44 /* context Drawing context */
45 /* ystart y-coord of top endpoint */
46 /* yend y-coord of bottom endpoint */
47 /* xpos x-coord of left edge */
48 /* width width of the line */
49 /* color Color of line to write */
50 /* */
51 /* OUTPUT */
52 /* */
53 /* None */
54 /* */
55 /* CALLS */
56 /* */
57 /* _gx_display_driver_vertical_line_alpha_draw */
58 /* Display driver basic vertical */
59 /* line alpha draw function */
60 /* */
61 /* CALLED BY */
62 /* */
63 /* GUIX Internal Code */
64 /* */
65 /* RELEASE HISTORY */
66 /* */
67 /* DATE NAME DESCRIPTION */
68 /* */
69 /* 12-31-2020 Kenneth Maxwell Initial Version 6.1.3 */
70 /* */
71 /**************************************************************************/
_gx_display_driver_16bpp_rotated_vertical_line_draw(GX_DRAW_CONTEXT * context,INT ystart,INT yend,INT xpos,INT width,GX_COLOR color)72 VOID _gx_display_driver_16bpp_rotated_vertical_line_draw(GX_DRAW_CONTEXT *context, INT ystart, INT yend, INT xpos, INT width, GX_COLOR color)
73 {
74 INT row;
75 INT column;
76 USHORT *put;
77 USHORT *rowstart;
78 INT len = yend - ystart + 1;
79
80 #if defined GX_BRUSH_ALPHA_SUPPORT
81 GX_UBYTE alpha;
82
83 alpha = context -> gx_draw_context_brush.gx_brush_alpha;
84 if (alpha == 0)
85 {
86 /* Nothing to drawn. Just return. */
87 return;
88 }
89 if (alpha != 0xff)
90 {
91 _gx_display_driver_vertical_line_alpha_draw(context, ystart, yend, xpos, width, color, alpha);
92 return;
93 }
94 #endif
95
96 /* pick up starting address of canvas memory */
97 rowstart = (USHORT *)context -> gx_draw_context_memory;
98
99 if (context -> gx_draw_context_display -> gx_display_rotation_angle == GX_SCREEN_ROTATION_CW)
100 {
101 /* calculate start of scanline */
102 rowstart += (context -> gx_draw_context_canvas -> gx_canvas_x_resolution - xpos - 1) * context -> gx_draw_context_pitch;
103
104 /* offset into starting pixel */
105 rowstart += ystart;
106 }
107 else
108 {
109 rowstart += (xpos + width - 1) * context -> gx_draw_context_pitch;
110 rowstart += (context -> gx_draw_context_canvas -> gx_canvas_y_resolution - yend - 1);
111 }
112
113 /* draw line width from left to right */
114 for (column = 0; column < width; column++)
115 {
116 put = rowstart;
117 /* draw line from top to bottom */
118 for (row = 0; row < len; row++)
119 {
120 *put++ = (USHORT)color;
121 }
122
123 /* advance to the right */
124 rowstart -= context -> gx_draw_context_pitch;
125 }
126 }
127
128
