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
21 #define GX_SOURCE_CODE
22
23
24 /* Include necessary system files. */
25
26 #include "gx_api.h"
27 #include "gx_utility.h"
28 #include "gx_display.h"
29
30
31 /**************************************************************************/
32 /* */
33 /* FUNCTION RELEASE */
34 /* */
35 /* _gx_display_driver_generic_aliased_wide_line_draw PORTABLE C */
36 /* 6.1.3 */
37 /* AUTHOR */
38 /* */
39 /* Kenneth Maxwell, Microsoft Corporation */
40 /* */
41 /* DESCRIPTION */
42 /* */
43 /* Generic display driver function for aliased wide line. */
44 /* */
45 /* INPUT */
46 /* */
47 /* context Drawing context */
48 /* xstart x-coord of endpoint */
49 /* ystart y-coord of endpoint */
50 /* xend x-coord of endpoint */
51 /* yend y-coord of endpoint */
52 /* */
53 /* OUTPUT */
54 /* */
55 /* None */
56 /* */
57 /* CALLS */
58 /* */
59 /* [gx_display_driver_simple_wide_line_draw] */
60 /* Basic display driver wide */
61 /* line draw function */
62 /* _gx_display_driver_generic_wide_line_points_calculate */
63 /* Calculate corners of wide line*/
64 /* _gx_display_driver_generic_aliased_filled_circle_draw */
65 /* Basic display driver aliased */
66 /* circle fill function */
67 /* _gx_display_driver_generic_wide_line_fill */
68 /* Basic display driver wide line*/
69 /* draw function */
70 /* */
71 /* CALLED BY */
72 /* */
73 /* GUIX Internal Code */
74 /* */
75 /* RELEASE HISTORY */
76 /* */
77 /* DATE NAME DESCRIPTION */
78 /* */
79 /* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */
80 /* 09-30-2020 Kenneth Maxwell Modified comment(s), */
81 /* resulting in version 6.1 */
82 /* 12-31-2020 Kenneth Maxwell Modified comment(s), */
83 /* supported display rotation, */
84 /* resulting in version 6.1.3 */
85 /* */
86 /**************************************************************************/
_gx_display_driver_generic_aliased_wide_line_draw(GX_DRAW_CONTEXT * context,INT xstart,INT ystart,INT xend,INT yend)87 VOID _gx_display_driver_generic_aliased_wide_line_draw(GX_DRAW_CONTEXT *context, INT xstart,
88 INT ystart, INT xend, INT yend)
89 {
90 GX_DISPLAY *display = context -> gx_draw_context_display;
91 INT brush_width = context -> gx_draw_context_brush.gx_brush_width;
92 GX_FIXED_POINT *line_points;
93 GX_FIXED_VAL sxcenter;
94 GX_FIXED_VAL sycenter;
95 GX_FIXED_VAL excenter;
96 GX_FIXED_VAL eycenter;
97 GX_RECTANGLE clip_rect;
98
99 #if defined(GX_BRUSH_ALPHA_SUPPORT)
100 GX_UBYTE old_alpha;
101 old_alpha = context -> gx_draw_context_brush.gx_brush_alpha;
102 context -> gx_draw_context_brush.gx_brush_alpha = GX_ALPHA_VALUE_OPAQUE;
103 #endif
104 /* calculate the corners of this line, save them
105 to our points array
106 */
107 if (!(context -> gx_draw_context_display -> gx_display_driver_pixel_blend))
108 {
109 display -> gx_display_driver_simple_wide_line_draw(context, xstart, ystart, xend, yend);
110 return;
111 }
112
113 if ((context -> gx_draw_context_brush.gx_brush_style & GX_BRUSH_ROUND) &&
114 (brush_width > 2))
115 {
116 sxcenter = GX_FIXED_VAL_MAKE(xstart);
117 sycenter = GX_FIXED_VAL_MAKE(ystart);
118 excenter = GX_FIXED_VAL_MAKE(xend);
119 eycenter = GX_FIXED_VAL_MAKE(yend);
120
121 if (!(brush_width & 0x01))
122 {
123 if (ystart == yend)
124 {
125 /* Horizontal line. */
126 sycenter -= GX_FIXED_VAL_HALF;
127 eycenter -= GX_FIXED_VAL_HALF;
128 }
129 else if (xstart == xend)
130 {
131 /* Vertical line. */
132 sxcenter -= GX_FIXED_VAL_HALF;
133 excenter -= GX_FIXED_VAL_HALF;
134 }
135 }
136
137 _gx_display_driver_generic_aliased_filled_circle_draw(context, sxcenter, sycenter,
138 GX_FIXED_VAL_MAKE(brush_width) >> 1);
139
140 _gx_display_driver_generic_aliased_filled_circle_draw(context, excenter, eycenter,
141 GX_FIXED_VAL_MAKE(brush_width) >> 1);
142 }
143
144 if (ystart == yend)
145 {
146 /* Horizontal line. */
147
148 if (xstart > xend)
149 {
150 GX_SWAP_VALS(xstart, xend);
151 }
152
153 clip_rect.gx_rectangle_left = (GX_VALUE)xstart;
154 clip_rect.gx_rectangle_right = (GX_VALUE)xend;
155 clip_rect.gx_rectangle_top = (GX_VALUE)(ystart - (brush_width >> 1));
156 clip_rect.gx_rectangle_bottom = (GX_VALUE)(clip_rect.gx_rectangle_top + brush_width - 1);
157
158 if (_gx_utility_rectangle_overlap_detect(&clip_rect, context -> gx_draw_context_clip, &clip_rect))
159 {
160 display -> gx_display_driver_horizontal_line_draw(context,
161 clip_rect.gx_rectangle_left,
162 clip_rect.gx_rectangle_right,
163 clip_rect.gx_rectangle_top,
164 clip_rect.gx_rectangle_bottom - clip_rect.gx_rectangle_top + 1,
165 context -> gx_draw_context_brush.gx_brush_line_color);
166 }
167 }
168 else if (xstart == xend)
169 {
170 /* Vertical line. */
171
172 if (ystart > yend)
173 {
174 GX_SWAP_VALS(ystart, yend);
175 }
176
177 clip_rect.gx_rectangle_left = (GX_VALUE)(xstart - (brush_width >> 1));
178 clip_rect.gx_rectangle_right = (GX_VALUE)(clip_rect.gx_rectangle_left + brush_width - 1);
179 clip_rect.gx_rectangle_top = (GX_VALUE)ystart;
180 clip_rect.gx_rectangle_bottom = (GX_VALUE)yend;
181
182 if (_gx_utility_rectangle_overlap_detect(&clip_rect, context -> gx_draw_context_clip, &clip_rect))
183 {
184 display -> gx_display_driver_vertical_line_draw(context,
185 clip_rect.gx_rectangle_top,
186 clip_rect.gx_rectangle_bottom,
187 clip_rect.gx_rectangle_left,
188 clip_rect.gx_rectangle_right - clip_rect.gx_rectangle_left + 1,
189 context -> gx_draw_context_brush.gx_brush_line_color);
190 }
191 }
192 else
193 {
194 line_points = _gx_display_driver_generic_wide_line_points_calculate(context, xstart, ystart,
195 xend, yend, brush_width, GX_TRUE);
196
197 if (display -> gx_display_rotation_angle)
198 {
199 _gx_display_driver_generic_rotated_wide_line_fill(context, line_points);
200 }
201 else
202 {
203 _gx_display_driver_generic_wide_line_fill(context, line_points);
204 }
205 }
206
207 #if defined(GX_BRUSH_ALPHA_SUPPORT)
208 context -> gx_draw_context_brush.gx_brush_alpha = old_alpha;
209 #endif
210 }
211
212
