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annotate src/power/SDL_power.c @ 5260:b0f5108fda60

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Cleaned up the file a bit for tutorial viewing
author Sam Lantinga <slouken@libsdl.org>
date Fri, 11 Feb 2011 13:06:35 -0800
parents 42e1092225f9
children b530ef003506
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23 #include "SDL_power.h"
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24
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25 /*
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26 * Returns SDL_TRUE if we have a definitive answer.
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27 * SDL_FALSE to try next implementation.
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28 */
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29 typedef SDL_bool
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30 (*SDL_GetPowerInfo_Impl) (SDL_PowerState * state, int *seconds,
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31 int *percent);
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32
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33 SDL_bool SDL_GetPowerInfo_Linux_proc_acpi(SDL_PowerState *, int *, int *);
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34 SDL_bool SDL_GetPowerInfo_Linux_proc_apm(SDL_PowerState *, int *, int *);
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35 SDL_bool SDL_GetPowerInfo_Windows(SDL_PowerState *, int *, int *);
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36 SDL_bool SDL_GetPowerInfo_MacOSX(SDL_PowerState *, int *, int *);
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37 SDL_bool SDL_GetPowerInfo_BeOS(SDL_PowerState *, int *, int *);
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38 SDL_bool SDL_GetPowerInfo_NintendoDS(SDL_PowerState *, int *, int *);
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39 SDL_bool SDL_GetPowerInfo_UIKit(SDL_PowerState *, int *, int *);
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40
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41 #ifndef SDL_POWER_DISABLED
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42 #ifdef SDL_POWER_HARDWIRED
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43 /* This is for things that _never_ have a battery */
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44 static SDL_bool
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45 SDL_GetPowerInfo_Hardwired(SDL_PowerState * state, int *seconds, int *percent)
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46 {
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47 *seconds = -1;
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48 *percent = -1;
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49 *state = SDL_POWERSTATE_NO_BATTERY;
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50 return SDL_TRUE;
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51 }
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52 #endif
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53 #endif
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54
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55
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56 static SDL_GetPowerInfo_Impl implementations[] = {
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57 #ifndef SDL_POWER_DISABLED
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58 #ifdef SDL_POWER_LINUX /* in order of preference. More than could work. */
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59 SDL_GetPowerInfo_Linux_proc_acpi,
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60 SDL_GetPowerInfo_Linux_proc_apm,
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61 #endif
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62 #ifdef SDL_POWER_WINDOWS /* handles Win32, Win64, PocketPC. */
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63 SDL_GetPowerInfo_Windows,
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64 #endif
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65 #ifdef SDL_POWER_UIKIT /* handles iPhone/iPad/etc */
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66 SDL_GetPowerInfo_UIKit,
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67 #endif
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68 #ifdef SDL_POWER_MACOSX /* handles Mac OS X, Darwin. */
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69 SDL_GetPowerInfo_MacOSX,
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70 #endif
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71 #ifdef SDL_POWER_NINTENDODS /* handles Nintendo DS. */
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72 SDL_GetPowerInfo_NintendoDS,
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73 #endif
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74 #ifdef SDL_POWER_BEOS /* handles BeOS, Zeta, with euc.jp apm driver. */
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75 SDL_GetPowerInfo_BeOS,
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76 #endif
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77 #ifdef SDL_POWER_HARDWIRED
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78 SDL_GetPowerInfo_Hardwired,
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79 #endif
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80 #endif
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81 };
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82
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83 SDL_PowerState
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84 SDL_GetPowerInfo(int *seconds, int *percent)
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85 {
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86 const int total = sizeof(implementations) / sizeof(implementations[0]);
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87 int _seconds, _percent;
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88 SDL_PowerState retval;
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89 int i;
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90
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91 /* Make these never NULL for platform-specific implementations. */
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92 if (seconds == NULL) {
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93 seconds = &_seconds;
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94 }
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95
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96 if (percent == NULL) {
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97 percent = &_percent;
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98 }
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99
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100 for (i = 0; i < total; i++) {
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101 if (implementations[i] (&retval, seconds, percent)) {
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102 return retval;
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103 }
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104 }
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105
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106 /* nothing was definitive. */
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107 *seconds = -1;
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108 *percent = -1;
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109 return SDL_POWERSTATE_UNKNOWN;
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110 }
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111
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112 /* vi: set ts=4 sw=4 expandtab: */