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annotate libcore/core/drawable.h @ 136:30b68089ae70

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core: rework actions and a bit of drawables, closes #2492 In the effort of having as less as possible memory allocation in libcore, the usage of actions and drawable no longer copy the original source parameter to let user pass a heap allocated variable or a static storage one. Update predefined drawable and actions to match these new needs.
author David Demelier <markand@malikania.fr>
date Tue, 13 Oct 2020 09:38:44 +0200
parents 9301c7c84471
children fea0cc899931
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1 /*
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2 * drawable.h -- automatic drawable objects
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3 *
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4 * Copyright (c) 2020 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 #ifndef MOLKO_DRAWABLE_H
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20 #define MOLKO_DRAWABLE_H
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21
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22 /**
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23 * \file drawable.h
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24 * \brief Automatic drawable objects.
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25 */
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26
129
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27 #include <stdbool.h>
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28
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29 /**
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30 * \brief Maximum number of drawable object into a stack.
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31 */
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32 #define DRAWABLE_STACK_MAX 128
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33
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34 /**
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35 * \brief Abstract drawable object.
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36 *
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37 * This structure is used to
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38 */
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39 struct drawable {
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40 void *data; /*!< (RW) Drawable data. */
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41 int x; /*!< (RW) X coordinate if necessary. */
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42 int y; /*!< (RW) Y coordinate if necessary. */
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43
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44 /**
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45 * Update this drawable.
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46 *
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47 * \param dw the drawable object
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48 * \param ticks the number of ticks since last frame
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49 * \return true if object has ended
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50 */
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51 bool (*update)(struct drawable *dw, unsigned int ticks);
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52
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53 /**
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54 * Draw this drawable.
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55 *
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56 * \param dw the drawable object
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57 */
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58 void (*draw)(struct drawable *dw);
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59
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60 /**
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61 * Destroy the drawable if necessary.
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62 *
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63 * \note This function is optional and can be NULL.
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64 * \param dw the drawable object
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65 */
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66 void (*finish)(struct drawable *dw);
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67 };
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68
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69 /**
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70 * Shortcut for dw->update (if not NULL).
129
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71 *
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72 * \pre dw != NULL
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73 * \param dw the drawable object
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74 * \param ticks elapsed milliseconds since last frame
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75 * \return true if the drawable ended
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76 */
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77 bool
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78 drawable_update(struct drawable *dw, unsigned int ticks);
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79
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80 /**
136
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81 * Shortcut for dw->draw (if not NULL).
129
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82 *
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83 * \pre dw != NULL
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84 * \param dw the drawable object
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85 */
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86 void
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87 drawable_draw(struct drawable *dw);
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88
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89 /**
136
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90 * Shortcut for dw->finish (if not NULL).
129
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91 *
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92 * \pre dw != NULL
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93 * \param dw the drawable object
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94 */
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95 void
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96 drawable_finish(struct drawable *dw);
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97
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98 /**
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99 * \brief Stack of drawable objects.
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100 *
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101 * This stack of drawable object can be used to store drawable objects within
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102 * a specific transition (state, battle, menu, etc).
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103 *
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104 * You can add, clear, update and draw them.
129
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105 */
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106 struct drawable_stack {
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107 struct drawable *objects[DRAWABLE_STACK_MAX]; /*!< (RW) Drawables. */
129
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108 };
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109
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110 /**
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111 * Initialize the stack.
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112 *
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113 * \pre st != NULL
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114 * \param st the drawable stack
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115 */
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116 void
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117 drawable_stack_init(struct drawable_stack *st);
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118
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119 /**
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120 * Add a drawable object into the stack.
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121 *
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122 * The drawable object must be kept alive until the stack uses it.
129
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123 *
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124 * \pre st != NULL
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125 * \pre dw != NULL
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126 * \param st the stack
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127 * \param dw the drawable to reference
129
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128 * \return true if the drawable was placed correctly and false if there wasn't
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129 * enough room.
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130 */
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131 bool
136
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132 drawable_stack_add(struct drawable_stack *st, struct drawable *dw);
129
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133
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134 /**
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135 * Update all drawable objects.
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136 *
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137 * Also remove drawable objects if they were finished.
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138 *
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139 * \pre st != NULL
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140 * \param st the drawable stack
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141 * \param ticks the number of ticks since last frame
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142 */
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143 void
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144 drawable_stack_update(struct drawable_stack *st, unsigned int ticks);
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145
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146 /**
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147 * Draw all drawable objects.
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148 *
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149 * \pre st != NULL
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150 * \param st the drawable stack
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151 */
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152 void
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153 drawable_stack_draw(struct drawable_stack *st);
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154
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155 /**
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156 * Clear all drawable objects into the stack.
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157 */
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158 void
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159 drawable_stack_finish(struct drawable_stack *st);
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160
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161 #endif /* !MOLKO_DRAWABLE_H */