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
25 /* Include necessary system files. */
26
27 #include "gx_api.h"
28 #include "gx_system.h"
29 #include "gx_utility.h"
30 #include "gx_display.h"
31
32
33 /**************************************************************************/
34 /* */
35 /* FUNCTION RELEASE */
36 /* */
37 /* _gx_display_driver_generic_glyph_8bit_draw PORTABLE C */
38 /* 6.1 */
39 /* AUTHOR */
40 /* */
41 /* Kenneth Maxwell, Microsoft Corporation */
42 /* */
43 /* DESCRIPTION */
44 /* */
45 /* This function draws the specified text using the current context, */
46 /* clipped to one viewport */
47 /* */
48 /* INPUT */
49 /* */
50 /* context Draw context */
51 /* draw_position The X and Y coordinate where */
52 /* the glyph is drawn to */
53 /* string String to draw */
54 /* count Count of string characters */
55 /* view view to clip drawing within */
56 /* */
57 /* OUTPUT */
58 /* */
59 /* None */
60 /* */
61 /* CALLS */
62 /* */
63 /* [gx_display_driver_pixel_blend] Call display driver pixel */
64 /* blend function */
65 /* */
66 /* CALLED BY */
67 /* */
68 /* GUIX internal code */
69 /* */
70 /* RELEASE HISTORY */
71 /* */
72 /* DATE NAME DESCRIPTION */
73 /* */
74 /* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */
75 /* 09-30-2020 Kenneth Maxwell Modified comment(s), */
76 /* resulting in version 6.1 */
77 /* */
78 /**************************************************************************/
_gx_display_driver_generic_glyph_8bit_draw(GX_DRAW_CONTEXT * context,GX_RECTANGLE * draw_area,GX_POINT * map_offset,GX_CONST GX_GLYPH * glyph)79 VOID _gx_display_driver_generic_glyph_8bit_draw(GX_DRAW_CONTEXT *context, GX_RECTANGLE *draw_area, GX_POINT *map_offset, GX_CONST GX_GLYPH *glyph)
80 {
81 GX_DISPLAY *display;
82 GX_UBYTE *glyph_row;
83 GX_UBYTE *glyph_data;
84 UINT row;
85 UINT col;
86 UINT pixel_width = 0;
87 GX_COLOR text_color;
88 UINT y_height;
89 GX_UBYTE alpha1;
90 GX_UBYTE brush_alpha = 0xff;
91
92 #if defined (GX_BRUSH_ALPHA_SUPPORT)
93 brush_alpha = context -> gx_draw_context_brush.gx_brush_alpha;
94 if (brush_alpha == 0)
95 {
96 return;
97 }
98 #endif
99
100 text_color = context -> gx_draw_context_brush.gx_brush_line_color;
101 pixel_width = (UINT)(draw_area -> gx_rectangle_right - draw_area -> gx_rectangle_left + 1);
102
103 /* pickup pointer to current display driver */
104 display = context -> gx_draw_context_display;
105
106 if (display -> gx_display_driver_pixel_blend == GX_NULL)
107 {
108 return;
109 }
110
111 glyph_row = (GX_UBYTE *)glyph -> gx_glyph_map;
112
113 if (map_offset -> gx_point_y)
114 {
115 glyph_row = glyph_row + (glyph -> gx_glyph_width * map_offset -> gx_point_y);
116 }
117
118 glyph_row += map_offset -> gx_point_x;
119
120 y_height = (UINT)(draw_area -> gx_rectangle_bottom - draw_area -> gx_rectangle_top + 1);
121
122 if (brush_alpha == 0xff)
123 {
124 for (row = 0; row < y_height; row++)
125 {
126 glyph_data = glyph_row;
127
128 for (col = 0; col < pixel_width; col++)
129 {
130 alpha1 = *glyph_data;
131
132 if (alpha1 > 0)
133 {
134 display -> gx_display_driver_pixel_blend(context,
135 draw_area -> gx_rectangle_left + (GX_VALUE)col,
136 draw_area -> gx_rectangle_top + (GX_VALUE)row,
137 text_color, (GX_UBYTE)alpha1);
138 }
139 glyph_data++;
140 }
141 glyph_row += glyph -> gx_glyph_width;
142 }
143 }
144 #if defined (GX_BRUSH_ALPHA_SUPPORT)
145 else
146 {
147 for (row = 0; row < y_height; row++)
148 {
149 glyph_data = glyph_row;
150
151 for (col = 0; col < pixel_width; col++)
152 {
153 alpha1 = *glyph_data;
154 alpha1 = (GX_UBYTE)(alpha1 * brush_alpha / 255);
155
156 if (alpha1 > 0)
157 {
158 display -> gx_display_driver_pixel_blend(context,
159 draw_area -> gx_rectangle_left + (GX_VALUE)col,
160 draw_area -> gx_rectangle_top + (GX_VALUE)row,
161 text_color, (GX_UBYTE)alpha1);
162 }
163
164 glyph_data++;
165 }
166 glyph_row += glyph -> gx_glyph_width;
167 }
168 }
169 #endif
170 }
171
172
