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annotate include/mb_backend.h @ 1472:7cb7abb5063b

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Refactory drawing functions into classes for state and transition
author Thinker K.F. Li <thinker@codemud.net>
date Sun, 24 Apr 2011 15:13:41 +0800
parents fa5f71d4aa04
children
rev   line source
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1 #ifndef __MB_BACKEND_H_
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2 #define __MB_BACKEND_H_
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3
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4 #include "mb_redraw_man.h"
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5 #include "mb_timer.h"
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6 #include "mb_observer.h"
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7 #include "mb_img_ldr.h"
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8
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9 #include "mb_config.h"
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10
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11 #ifdef X_BACKEND
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12 #include "mb_X_supp.h"
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13 #endif
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14
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15 #ifdef DFB_BACKEND
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16 #inclde "mb_dfb_supp.h"
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17 #endif
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18
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19 #ifdef CONSOLE_BACKEND
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20 #include "mb_cons_supp.h"
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21 #endif
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22
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23 struct _mb_rt;
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24 typedef struct _mb_rt mb_rt_t;
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25
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26 struct _mb_timer_man;
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27 struct _mb_timer_factory;
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28 struct _mb_IO_man;
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29 struct _mb_IO_factory;
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30
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31 /*! \brief Type of IO that registered with an IO manager.
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32 */
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33 enum _MB_IO_TYPE {MB_IO_DUMMY, MB_IO_R, MB_IO_W, MB_IO_RW};
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34
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35 typedef struct _mb_timer_man mb_timer_man_t;
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36 typedef struct _mb_timer_factory mb_timer_factory_t;
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37 typedef struct _mb_IO_man mb_IO_man_t;
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38 typedef struct _mb_IO_factory mb_IO_factory_t;
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39 typedef enum _MB_IO_TYPE MB_IO_TYPE;
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40
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41 /*! \brief Function signature of callback functions for IO requests.
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42 */
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43 typedef void (*mb_IO_cb_t)(int hdl, int fd, MB_IO_TYPE type, void *data);
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44
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45 /*! \brief The backend engine mb_backend_t is used to define the
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46 * interface to realize the MB.
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47 *
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48 * A backend is used to receive events from the system. The MB does
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49 * not define the backend by itself. Instead, it define an interface
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50 * which allow the lower layer to implement the event system. Each
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51 * backend need to provides the following events.
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52 *
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53 * - keyboard event
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54 * - timer event
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55 * - image loader(?)
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56 * - render manager(?)
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57 */
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58 typedef struct {
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59 mb_rt_t *(*rt_new)(const char *display, int w,int h);
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60 mb_rt_t *(*rt_new_with_win)(MB_DISPLAY display, MB_WINDOW win);
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61
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62 void (*rt_free)(mb_rt_t *rt);
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63 void (*rt_free_keep_win)(mb_rt_t *rt);
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64 /*! \brief Request the backend to start monitoring a file descriptor.
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65 *
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66 * This is used only when the backend is responsible for event loop.
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67 */
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68 int (*add_event)(mb_rt_t *rt, int fd, MB_IO_TYPE type,
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69 mb_IO_cb_t f,void *arg);
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70 /*! \brief Request the backend to stop monitoring a file descriptor.
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71 *
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72 * This is used only when the backend is responsible for event loop.
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73 */
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74 void (*remove_event)(mb_rt_t *rt, int hdl);
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75 /*! \brief Event Loop
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76 *
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77 * This is called when main application does not handle event
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78 * loop. Or, it should register an IO factory (i.e \ref
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79 * mb_IO_factory_t) with the backend.
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80 */
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81 void (*event_loop)(mb_rt_t *rt);
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82
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83 /*! \brief Flush requests to screen server if existed */
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84 int (*flush)(mb_rt_t *rt);
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85
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86 subject_t *(*kbevents)(mb_rt_t *rt);
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87 redraw_man_t *(*rdman)(mb_rt_t *rt);
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88 mb_timer_man_t *(*timer_man)(mb_rt_t *rt);
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89 observer_factory_t *(*observer_factory)(mb_rt_t *rt);
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90 mb_img_ldr_t *(*loader)(mb_rt_t *rt);
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91
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92 /*
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93 * Following two methods are used to integrate a backend to
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94 * event loop of main application.
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95 */
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96 void (*reg_IO_factory)(mb_IO_factory_t *io_man);
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97 void (*reg_timer_factory)(mb_timer_factory_t *tm_man);
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98 } mb_backend_t;
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99
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100 #define mb_runtime_new(disp, w, h) \
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101 mb_dfl_backend.rt_new((disp), (w), (h))
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102 #define mb_runtime_new_with_win(disp, win) \
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103 mb_dfl_backend.rt_new_with_win((disp), (win))
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104 #define mb_reg_IO_factory(io_fact) \
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105 mb_dfl_backend.reg_IO_factory(io_fact)
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106 #define mb_reg_timer_factory(tm_fact) \
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107 mb_dfl_backend.reg_timer_factory(tm_fact)
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108
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109 /*
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110 * This is defined by backend implementations. For example, X_supp.c
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111 * or dfb_supp.c should defined a backend.
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112 */
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113 extern mb_backend_t mb_dfl_backend;
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114
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115 #define mb_runtime_free(rt) \
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116 mb_dfl_backend.rt_free(rt)
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117 #define mb_runtime_free_keep_win(rt) \
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118 mb_dfl_backend.rt_free_keep_win(rt)
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119 #define mb_runtime_add_event(rt, fd, type, cb, arg) \
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120 mb_dfl_backend.add_event((rt), (fd), (type), (cb), (arg))
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121 #define mb_runtime_remove_event(hdl) \
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122 mb_dfl_backend.remove_event((rt), (hdl))
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123 #define mb_runtime_event_loop(rt) \
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124 mb_dfl_backend.event_loop(rt)
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125 #define mb_runtime_flush(rt) \
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126 mb_dfl_backend.flush(rt)
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127 #define mb_runtime_kbevents(rt) \
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128 mb_dfl_backend.kbevents(rt)
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129 #define mb_runtime_rdman(rt) \
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130 mb_dfl_backend.rdman(rt)
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131 #define mb_runtime_timer_man(rt) \
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132 mb_dfl_backend.timer_man(rt)
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133 #define mb_runtime_observer_factory(rt) \
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134 mb_dfl_backend.observer_factory(rt)
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135 #define mb_runtime_loader(rt) \
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136 mb_dfl_backend.loader(rt)
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137
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138
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139 /*! \brief IO Manager
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140 */
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141 struct _mb_IO_man {
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142 int (*reg)(struct _mb_IO_man *io_man,
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143 int fd, MB_IO_TYPE type, mb_IO_cb_t cb, void *data);
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144 void (*unreg)(struct _mb_IO_man *io_man,
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145 int io_hdl);
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146 };
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147
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148 /*! \brief Factory of IO managers.
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149 */
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150 struct _mb_IO_factory {
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151 mb_IO_man_t *(*io_man_new)(void);
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152 void (*io_man_free)(mb_IO_man_t *io_man);
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153 };
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154
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155 #define mb_io_man_reg(io_man, fd, type, cb, data) \
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156 (io_man)->reg(io_man, fd, type, cb, data)
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157 #define mb_io_man_unreg(io_man, io_hdl) \
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158 (io_man)->unreg(io_man, io_hdl)
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159 #define mb_io_man_new(io_fact) (io_fact)->io_man_new()
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160 #define mb_io_man_free(io_fact, io_man) (io_fact)->io_man_free(io_man)
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161
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162 /*! \brief Function signature of callback functions for timers.
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163 */
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164 typedef void (*mb_timer_cb_t)(int hdl,
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165 const mb_timeval_t *tmo,
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166 const mb_timeval_t *now,
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167 void *data);
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168
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169 /*! \brief Timer manager
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170 */
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171 struct _mb_timer_man {
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172 /*! \brief Setup a timeout callback.
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173 *
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174 * \return -1 for error.
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175 */
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176 int (*timeout)(struct _mb_timer_man *tm_man,
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177 mb_timeval_t *tmout, /* tiemout (wall time) */
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178 mb_timer_cb_t cb, void *data);
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179 /*! \brief Remove a timeout request.
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180 *
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181 * \param tm_hdl is the handle returned by _mb_timer_man::timeout.
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182 */
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183 void (*remove)(struct _mb_timer_man *tm_man, int tm_hdl);
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184 };
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185
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186 /*! \brief Factory of timer manager.
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187 */
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188 struct _mb_timer_factory {
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189 mb_timer_man_t *(*timer_man_new)(void);
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190 void (*timer_man_free)(mb_timer_man_t *timer_man);
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191 };
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192
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193 #define mb_timer_man_timeout(tm_man, tmout, cb, data) \
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194 (tm_man)->timeout((tm_man), (tmout), (cb), (data))
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195 #define mb_timer_man_remove(tm_man, tm_hdl) \
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196 (tm_man)->remove((tm_man), (tm_hdl))
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197 #define mb_timer_man_new(tm_fact) (tm_fact)->timer_man_new()
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198 #define mb_timer_man_free(tm_fact, tm_man) (tm_fact)->timer_man_free(tm_man)
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199
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200 #endif /* __MB_BACKEND_H_ */