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annotate src/libmlk-core/core/drawable-stack.c @ 368:15bdac29ba4b

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core: split drawable and drawable_stack
author David Demelier <markand@malikania.fr>
date Sun, 24 Oct 2021 17:07:20 +0200
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children 460c78706989
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1 /*
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2 * drawable-stack.c -- convenient stack of drawables
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3 *
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4 * Copyright (c) 2020-2021 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <assert.h>
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20 #include <string.h>
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21
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22 #include "drawable.h"
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23 #include "drawable-stack.h"
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24
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25 #define DRAWABLE_FOREACH(st, iter) \
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26 for (size_t i = 0; i < DRAWABLE_STACK_MAX && ((iter) = (st)->objects[i], 1); ++i)
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27
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28 void
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29 drawable_stack_init(struct drawable_stack *st)
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30 {
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31 assert(st);
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32
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33 memset(st, 0, sizeof (*st));
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34 }
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35
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36 int
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37 drawable_stack_add(struct drawable_stack *st, struct drawable *dw)
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38 {
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39 assert(st);
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40 assert(dw);
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41
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42 for (size_t i = 0; i < DRAWABLE_STACK_MAX; ++i) {
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43 if (!st->objects[i]) {
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44 st->objects[i] = dw;
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45 return 0;
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46 }
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47 }
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48
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49 return -1;
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50 }
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51
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52 int
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53 drawable_stack_update(struct drawable_stack *st, unsigned int ticks)
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54 {
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55 assert(st);
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56
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57 for (size_t i = 0; i < DRAWABLE_STACK_MAX; ++i) {
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58 struct drawable *dw = st->objects[i];
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59
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60 if (dw && drawable_update(dw, ticks)) {
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61 drawable_end(dw);
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62 drawable_finish(dw);
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63 st->objects[i] = NULL;
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64 }
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65 }
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66
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67 /*
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68 * We process the array again in case a drawable added a new drawable
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69 * within the update function.
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70 */
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71 return drawable_stack_completed(st);
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72 }
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73
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74 void
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75 drawable_stack_draw(struct drawable_stack *st)
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76 {
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77 assert(st);
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78
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79 struct drawable *dw;
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80
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81 DRAWABLE_FOREACH(st, dw)
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82 if (dw)
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83 drawable_draw(dw);
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84 }
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85
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86 int
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87 drawable_stack_completed(const struct drawable_stack *st)
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88 {
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89 assert(st);
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90
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91 struct drawable *dw;
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92
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93 DRAWABLE_FOREACH(st, dw)
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94 if (dw)
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95 return 0;
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96
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97 return 1;
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98 }
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99
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100 void
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101 drawable_stack_finish(struct drawable_stack *st)
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102 {
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103 assert(st);
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104
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105 struct drawable *dw;
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106
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107 DRAWABLE_FOREACH(st, dw) {
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108 if (dw) {
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109 drawable_end(dw);
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110 drawable_finish(dw);
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111 }
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112 }
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113
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114 memset(st, 0, sizeof (*st));
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115 }