GCC Code Coverage Report

Directory: src/gate/
File: src/gate/graphics/drawing.c
Date: 2025-09-14 13:10:38
Exec Total Coverage
Lines: 85 113 75.2%
Functions: 9 9 100.0%
Branches: 48 80 60.0%
Line Branch Exec Source
1 /* GATE PROJECT LICENSE:
2 +----------------------------------------------------------------------------+
3 | Copyright(c) 2018-2025, Stefan Meislinger |
4 | All rights reserved. |
5 | |
6 | Redistribution and use in source and binary forms, with or without |
7 | modification, are permitted provided that the following conditions are met:|
8 | |
9 | 1. Redistributions of source code must retain the above copyright notice, |
10 | this list of conditions and the following disclaimer. |
11 | 2. Redistributions in binary form must reproduce the above copyright |
12 | notice, this list of conditions and the following disclaimer in the |
13 | documentation and/or other materials provided with the distribution. |
14 | |
15 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"|
16 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
17 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
18 | ARE DISCLAIMED.IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
19 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
20 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
21 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
22 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
23 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
24 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
25 | THE POSSIBILITY OF SUCH DAMAGE. |
26 +----------------------------------------------------------------------------+
27 */
28
29 #include "gate/graphics/drawing.h"
30 #include "gate/mathematics.h"
31 #include "gate/results.h"
32
33
34 707 static void gate_rasterimage_plot(gate_rasterimage_t* image, int x, int y, gate_color_painter_t painter, gate_color_t const* color)
35 {
36 gate_uint8_t* ptr_data;
37 gate_color_t pixel;
38
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 727 if (x < 0) return;
39
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 707 if (x >= (int)image->width) return;
40
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 697 if (y < 0) return;
41
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 697 if (y >= (int)image->height) return;
42 687 ptr_data = image->get_ptr(image->data, image->width, image->height, image->line_padding, x, y);
43 687 image->read_pixel(ptr_data, &pixel);
44 687 painter(&pixel, color);
45 687 image->write_pixel(ptr_data, &pixel);
46 }
47
48 17 static void gate_rasterimage_line(gate_rasterimage_t* image, int x1, int y1, int x2, int y2, gate_color_t color)
49 {
50 17 int delta_x = (x2 - x1);
51 17 int ix = ((delta_x > 0) - (delta_x < 0));
52
53 17 int delta_y = (y2 - y1);
54 17 int iy = ((delta_y > 0) - (delta_y < 0));
55
56 17 gate_color_painter_t painter = &gate_color_set_transparent;
57
58 int error;
59
60 17 delta_x = gate_math_abs_i32(delta_x) << 1;
61 17 delta_y = gate_math_abs_i32(delta_y) << 1;
62
63 17 gate_rasterimage_plot(image, x1, y1, painter, &color);
64
65
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 17 if (delta_x >= delta_y)
66 {
67 // error may go below zero
68 11 error = (delta_y - (delta_x >> 1));
69
70
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 683 while (x1 != x2)
71 {
72
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 672 if ((error > 0) || (!error && (ix > 0)))
73 {
74 336 error -= delta_x;
75 336 y1 += iy;
76 }
77 672 error += delta_y;
78 672 x1 += ix;
79 672 gate_rasterimage_plot(image, x1, y1, painter, &color);
80 }
81 }
82 else
83 {
84 // error may go below zero
85 6 error = (delta_x - (delta_y >> 1));
86
87
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 24 while (y1 != y2)
88 {
89 // reduce error, while taking into account the corner case of error == 0
90
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 18 if ((error > 0) || (!error && (iy > 0)))
91 {
92 ✗ error -= delta_y;
93 ✗ x1 += ix;
94 }
95 18 error += delta_x;
96 18 y1 += iy;
97
98 18 gate_rasterimage_plot(image, x1, y1, painter, &color);
99 }
100 }
101 17 }
102
103 17 gate_result_t gate_draw_line(gate_rasterimage_t* image, int x1, int y1, int x2, int y2, gate_color_t color)
104 {
105 17 gate_rasterimage_line(image, x1, y1, x2, y2, color);
106 17 return GATE_RESULT_OK;
107 }
108
109 19 static void gate_draw_hline_quick(gate_rasterimage_t* image, int x, int y, int len, gate_color_t color)
110 {
111 19 gate_uint8_t* ptr_data = image->get_ptr(image->data, image->width, image->height, image->line_padding, x, y);
112 19 unsigned const pixel_length = image->pixel_length;
113
114
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 204 while (len-- > 0)
115 {
116 185 image->write_pixel(ptr_data, &color);
117 185 ptr_data += pixel_length;
118 }
119 19 }
120 2 static void gate_draw_hline(gate_rasterimage_t* image, int x, int y, int len, gate_color_t color)
121 {
122
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 2 if ((y < 0) || (y >= (int)image->height) || (len == 0))
123 {
124 ✗ return;
125 }
126
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 2 if (len < 0)
127 {
128 ✗ x += len;
129 ✗ len = -len;
130 }
131
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 2 if (((x + len) < 0) || (x >= (int)image->width))
132 {
133 ✗ return;
134 }
135
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 2 if (x < 0)
136 {
137 ✗ len += x;
138 ✗ x = 0;
139 }
140
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 2 if ((x + len) >= (int)image->width)
141 {
142 ✗ len = (int)image->width - x;
143 }
144 2 gate_draw_hline_quick(image, x, y, len, color);
145 }
146
147 2 static void gate_draw_vline_quick(gate_rasterimage_t* image, int x, int y, int len, gate_color_t color)
148 {
149 2 gate_uint8_t* ptr_data = image->get_ptr(image->data, image->width, image->height, image->line_padding, x, y);
150 2 unsigned const line_length = image->width * image->pixel_length + image->line_padding;
151
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 36 while (len-- > 0)
152 {
153 34 image->write_pixel(ptr_data, &color);
154 34 ptr_data += line_length;
155 }
156 2 }
157 2 static void gate_draw_vline(gate_rasterimage_t* image, int x, int y, int len, gate_color_t color)
158 {
159
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 2 if ((x < 0) || (x >= (int)image->width) || (len == 0))
160 {
161 ✗ return;
162 }
163
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 2 if (len < 0)
164 {
165 ✗ y += len;
166 ✗ len = -len;
167 }
168
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 2 if (((y + len) < 0) || (y >= (int)image->height))
169 {
170 ✗ return;
171 }
172
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 2 if (y < 0)
173 {
174 ✗ len += y;
175 ✗ y = 0;
176 }
177
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 2 if ((y + len) >= (int)image->height)
178 {
179 ✗ len = (int)image->height - y;
180 }
181 2 gate_draw_vline_quick(image, x, y, len, color);
182 }
183
184
185 1 gate_result_t gate_draw_rectangle(gate_rasterimage_t* image, int x1, int y1, int x2, int y2, gate_color_t color)
186 {
187 int tmp;
188
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189 {
190 ✗ tmp = x1;
191 ✗ x1 = x2;
192 ✗ x2 = tmp;
193 }
194
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 1 if (y1 > y2)
195 {
196 ✗ tmp = y1;
197 ✗ y1 = y2;
198 ✗ y2 = tmp;
199 }
200 1 gate_draw_hline(image, x1, y1, x2 - x1 + 1, color);
201 1 gate_draw_hline(image, x1, y2, x2 - x1 + 1, color);
202 1 gate_draw_vline(image, x1, y1, y2 - y1 + 1, color);
203 1 gate_draw_vline(image, x2, y1, y2 - y1 + 1, color);
204 1 return GATE_RESULT_OK;
205 }
206
207 1 gate_result_t gate_draw_box(gate_rasterimage_t* image, int x1, int y1, int x2, int y2, gate_color_t color)
208 {
209 int tmp;
210
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 1 if (x1 > x2)
211 {
212 ✗ tmp = x1;
213 ✗ x1 = x2;
214 ✗ x2 = tmp;
215 }
216
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 1 if (y1 > y2)
217 {
218 ✗ tmp = y1;
219 ✗ y1 = y2;
220 ✗ y2 = tmp;
221 }
222
223
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 1 if (x1 < 0) x1 = 0;
224
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 1 if (y1 < 0) y1 = 0;
225
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 1 if (x2 >= (int)image->width) x2 = (int)image->width - 1;
226
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 1 if (y2 >= (int)image->height) y2 = (int)image->height - 1;
227
228 1 tmp = x2 - x1 + 1;
229
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 18 while (y1 <= y2)
230 {
231 17 gate_draw_hline_quick(image, x1, y1, tmp, color);
232 17 ++y1;
233 }
234 1 return GATE_RESULT_OK;
235 }
236
237