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 #define GX_SOURCE_CODE
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_8bpp_vertical_line_draw PORTABLE C */
33 /* 6.1 */
34 /* AUTHOR */
35 /* */
36 /* Kenneth Maxwell, Microsoft Corporation */
37 /* */
38 /* DESCRIPTION */
39 /* */
40 /* Generic 8bpp color format vertical line draw function. */
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 draw */
50 /* */
51 /* OUTPUT */
52 /* */
53 /* None */
54 /* */
55 /* CALLS */
56 /* */
57 /* _gx_display_driver_vertical_line_alpha_draw */
58 /* Basic display driver vertical */
59 /* alpha line draw function */
60 /* */
61 /* CALLED BY */
62 /* */
63 /* GUIX Internal Code */
64 /* */
65 /* RELEASE HISTORY */
66 /* */
67 /* DATE NAME DESCRIPTION */
68 /* */
69 /* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */
70 /* 09-30-2020 Kenneth Maxwell Modified comment(s), */
71 /* resulting in version 6.1 */
72 /* */
73 /**************************************************************************/
_gx_display_driver_8bpp_vertical_line_draw(GX_DRAW_CONTEXT * context,INT ystart,INT yend,INT xpos,INT width,GX_COLOR color)74 VOID _gx_display_driver_8bpp_vertical_line_draw(GX_DRAW_CONTEXT *context, INT ystart, INT yend, INT xpos, INT width, GX_COLOR color)
75 {
76 INT row;
77 INT column;
78 GX_UBYTE *put;
79 GX_UBYTE *rowstart;
80 INT len = yend - ystart + 1;
81 #if defined GX_BRUSH_ALPHA_SUPPORT
82 GX_UBYTE alpha;
83
84 alpha = context -> gx_draw_context_brush.gx_brush_alpha;
85 if (alpha == 0)
86 {
87 /* Nothing to drawn. Just return. */
88 return;
89 }
90 if (alpha != 0xff)
91 {
92 if (context -> gx_draw_context_display -> gx_display_color_format != GX_COLOR_FORMAT_8BIT_PACKED_PIXEL)
93 {
94 /* Alpha blend is not supported for palette driver. */
95 return;
96 }
97
98 _gx_display_driver_vertical_line_alpha_draw(context, ystart, yend, xpos, width, color, alpha);
99 return;
100 }
101 #endif
102
103 /* pick up starting address of canvas memory */
104 rowstart = (GX_UBYTE *)context -> gx_draw_context_memory;
105
106 /* calculate start of scanline */
107 rowstart += context -> gx_draw_context_pitch * ystart;
108
109 /* offset into starting pixel */
110 rowstart += xpos;
111
112 /* draw line from top to bottom */
113 for (row = 0; row < len; row++)
114 {
115 put = rowstart;
116
117 /* draw line width from left to right */
118 for (column = 0; column < width; column++)
119 {
120 *put++ = (GX_UBYTE)color;
121 }
122
123 /* advance to the next scaneline */
124 rowstart += context -> gx_draw_context_pitch;
125 }
126 }
127
