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_system.h"
28 #include "gx_utility.h"
29 #include "gx_display.h"
30 #include "gx_canvas.h"
31
32 /**************************************************************************/
33 /* */
34 /* FUNCTION RELEASE */
35 /* */
36 /* _gx_canvas_pie_draw PORTABLE C */
37 /* 6.1 */
38 /* AUTHOR */
39 /* */
40 /* Kenneth Maxwell, Microsoft Corporation */
41 /* */
42 /* DESCRIPTION */
43 /* */
44 /* This draws a pie into the currrent context. */
45 /* */
46 /* INPUT */
47 /* */
48 /* xcenter x-coord of center of circle */
49 /* arc */
50 /* ycenter y-coord of center of circle */
51 /* arc */
52 /* r Radius of circle arc */
53 /* start_angle The start angle of circle arc */
54 /* end_angle The end angle of circle arc */
55 /* */
56 /* OUTPUT */
57 /* */
58 /* None */
59 /* */
60 /* CALLS */
61 /* */
62 /* _gx_utility_rectangle_define Define a rectangle */
63 /* _gx_utility_rectangle_overlap_detect Detect rectangle overlap */
64 /* [gx_display_driver_pie_fill] Display driver basic */
65 /* pie drawing routine */
66 /* [gx_display_driver_arc_draw] Display driver basic */
67 /* arc drawing routine */
68 /* _gx_display_driver_anti_aliased_arc_draw */
69 /* Display driver basic aliased */
70 /* arc drawing routine */
71 /* _gx_utility_circle_point_get Get point position on a circle*/
72 /* _gx_canvas_line_draw Draw a line */
73 /* */
74 /* CALLED BY */
75 /* */
76 /* Application code */
77 /* */
78 /* RELEASE HISTORY */
79 /* */
80 /* DATE NAME DESCRIPTION */
81 /* */
82 /* 05-19-2020 Kenneth Maxwell Initial Version 6.0 */
83 /* 09-30-2020 Kenneth Maxwell Modified comment(s), */
84 /* resulting in version 6.1 */
85 /* */
86 /**************************************************************************/
87 #if defined(GX_ARC_DRAWING_SUPPORT)
_gx_canvas_pie_draw(INT xcenter,INT ycenter,UINT r,INT start_angle,INT end_angle)88 UINT _gx_canvas_pie_draw(INT xcenter, INT ycenter, UINT r, INT start_angle, INT end_angle)
89 {
90 /* A pie is a fraction of a circle delimited by two lines that span from the center of the
91 circle to the one side each. */
92
93 GX_DRAW_CONTEXT *context;
94 GX_DISPLAY *display;
95 GX_RECTANGLE bound;
96 GX_RECTANGLE clip_rect;
97 GX_VIEW *view;
98 GX_BRUSH *brush;
99 GX_POINT point;
100 INT brush_width;
101 VOID (*outline_function)(GX_DRAW_CONTEXT *context, INT xcenter, INT ycenter, UINT r, INT start_angle, INT end_angle);
102
103 #if defined(GX_BRUSH_ALPHA_SUPPORT)
104 GX_UBYTE brush_alpha;
105 #endif
106
107 while (start_angle < 0)
108 {
109 start_angle += 360;
110 }
111
112 while (end_angle < 0)
113 {
114 end_angle += 360;
115 }
116
117 if (start_angle >= 360)
118 {
119 start_angle %= 360;
120 }
121
122 if (end_angle >= 360)
123 {
124 end_angle %= 360;
125 }
126
127 if (end_angle <= start_angle)
128 {
129 end_angle += 360;
130 }
131 /* pick up the current drawing context */
132 context = _gx_system_current_draw_context;
133
134 brush = &context -> gx_draw_context_brush;
135
136 brush_width = ((INT)(brush -> gx_brush_width + 1)) >> 1;
137
138 /* Define pie bounding rectangle. */
139 _gx_utility_rectangle_define(&bound, (GX_VALUE)(xcenter - (INT)r - brush_width), (GX_VALUE)(ycenter - (INT)r - brush_width),
140 (GX_VALUE)(xcenter + (INT)r + brush_width), (GX_VALUE)(ycenter + (INT)r + brush_width));
141
142 brush_width = brush -> gx_brush_width;
143
144
145 /* clip the pie bounding box to the dirty rectangle */
146 if (!_gx_utility_rectangle_overlap_detect(&bound, &context -> gx_draw_context_dirty, &bound))
147 {
148 /* nothing to draw, return */
149 return GX_SUCCESS;
150 }
151
152 /* pick up current display driver */
153 display = context -> gx_draw_context_display;
154
155 /* Determine outline function to utilize.*/
156 outline_function = GX_NULL;
157
158 /* Determine which outline function to use.*/
159 if (brush_width == 1)
160 {
161 /* if anti-alias is requested and this is supported by display, use it */
162 if ((brush -> gx_brush_style & GX_BRUSH_ALIAS) &&
163 display -> gx_display_driver_anti_aliased_arc_draw != GX_NULL)
164 {
165 outline_function = display -> gx_display_driver_anti_aliased_arc_draw;
166 }
167 else
168 {
169 /* otherwise use non-aliased outline */
170 outline_function = display -> gx_display_driver_arc_draw;
171 }
172 }
173 else
174 {
175 if (brush_width > 1)
176 {
177 /* if anti-alias is requested and this is supported by display, use it */
178 if ((brush -> gx_brush_style & GX_BRUSH_ALIAS) &&
179 display -> gx_display_driver_anti_aliased_wide_arc_draw)
180 {
181 outline_function = display -> gx_display_driver_anti_aliased_wide_arc_draw;
182 }
183 else
184 {
185 /* otherwise use non-aliased outline */
186 outline_function = display -> gx_display_driver_wide_arc_draw;
187 }
188 }
189 }
190
191 /* test to determine if the bounding rectangle overlaps the region we are allowed to draw
192 into. For each view that overlaps the bounding rectangle, do some drawing.
193 */
194 view = context -> gx_draw_context_view_head;
195
196 while (view)
197 {
198 if (!_gx_utility_rectangle_overlap_detect(&view -> gx_view_rectangle, &bound, &clip_rect))
199 {
200 view = view -> gx_view_next;
201 continue;
202 }
203
204 /* we have a view into which we can draw the arc, do it */
205 context -> gx_draw_context_clip = &clip_rect;
206
207 if (brush_width)
208 {
209 brush_width -= 1;
210 brush_width >>= 1;
211 }
212
213 if ((brush -> gx_brush_style & (GX_BRUSH_SOLID_FILL | GX_BRUSH_PIXELMAP_FILL)) &&
214 (r > (UINT)brush_width))
215 {
216 display -> gx_display_driver_pie_fill(context, xcenter, ycenter, r - (UINT)brush_width, start_angle, end_angle);
217 }
218
219 #if defined(GX_BRUSH_ALPHA_SUPPORT)
220 brush_alpha = context -> gx_draw_context_brush.gx_brush_alpha;
221 if (brush -> gx_brush_width > 1)
222 {
223 context -> gx_draw_context_brush.gx_brush_alpha = GX_ALPHA_VALUE_OPAQUE;
224 }
225 #endif
226 if (outline_function)
227 {
228 outline_function(context, xcenter, ycenter, r, start_angle, end_angle);
229 }
230
231 if (r > (UINT)brush_width)
232 {
233 _gx_utility_circle_point_get(xcenter, ycenter, r - (UINT)brush_width, start_angle, &point);
234
235 /* Draw delimiting line. */
236 _gx_canvas_line_draw((GX_VALUE)xcenter, (GX_VALUE)ycenter, point.gx_point_x, point.gx_point_y);
237
238 _gx_utility_circle_point_get(xcenter, ycenter, r - (UINT)brush_width, end_angle, &point);
239
240 /* Draw delimiting line. */
241 _gx_canvas_line_draw((GX_VALUE)xcenter, (GX_VALUE)ycenter, point.gx_point_x, point.gx_point_y);
242 }
243
244 #if defined(GX_BRUSH_ALPHA_SUPPORT)
245 context -> gx_draw_context_brush.gx_brush_alpha = brush_alpha;
246 #endif
247 view = view -> gx_view_next;
248 }
249
250 /* Return successful completion. */
251 return(GX_SUCCESS);
252 }
253
254 #endif
255
256
