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annotate src/power/macosx/SDL_syspower.c @ 3319:63d4517fc4ac

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Fixed bug #777 Implemented SDL_GetPlatform()
author Sam Lantinga <slouken@libsdl.org>
date Sat, 26 Sep 2009 10:32:14 +0000
parents 51750b7a966f
children f7b03b6838cb
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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
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24 #ifndef SDL_POWER_DISABLED
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25 #ifdef SDL_POWER_MACOSX
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26
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27 #include <Carbon/Carbon.h>
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28 #include <IOKit/ps/IOPowerSources.h>
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29 #include <IOKit/ps/IOPSKeys.h>
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30
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31 #include "SDL_power.h"
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32
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33 /* Carbon is so verbose... */
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34 #define STRMATCH(a,b) (CFStringCompare(a, b, 0) == kCFCompareEqualTo)
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35 #define GETVAL(k,v) \
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36 CFDictionaryGetValueIfPresent(dict, CFSTR(k), (const void **) v)
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37
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38 /* Note that AC power sources also include a laptop battery it is charging. */
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39 static void
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40 checkps(CFDictionaryRef dict, SDL_bool * have_ac, SDL_bool * have_battery,
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41 SDL_bool * charging, int *seconds, int *percent)
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42 {
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43 CFStringRef strval; /* don't CFRelease() this. */
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44 CFBooleanRef bval;
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45 CFNumberRef numval;
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46 SDL_bool charge = SDL_FALSE;
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47 SDL_bool choose = SDL_FALSE;
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48 SDL_bool is_ac = SDL_FALSE;
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49 int secs = -1;
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50 int maxpct = -1;
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51 int pct = -1;
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52
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53 if ((GETVAL(kIOPSIsPresentKey, &bval)) && (bval == kCFBooleanFalse)) {
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54 return; /* nothing to see here. */
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55 }
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56
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57 if (!GETVAL(kIOPSPowerSourceStateKey, &strval)) {
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58 return;
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59 }
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60
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61 if (STRMATCH(strval, CFSTR(kIOPSACPowerValue))) {
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62 is_ac = *have_ac = SDL_TRUE;
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63 } else if (!STRMATCH(strval, CFSTR(kIOPSBatteryPowerValue))) {
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64 return; /* not a battery? */
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65 }
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66
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67 if ((GETVAL(kIOPSIsChargingKey, &bval)) && (bval == kCFBooleanTrue)) {
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68 charge = SDL_TRUE;
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69 }
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70
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71 if (GETVAL(kIOPSMaxCapacityKey, &numval)) {
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72 SInt32 val = -1;
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73 CFNumberGetValue(numval, kCFNumberSInt32Type, &val);
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74 if (val > 0) {
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75 *have_battery = SDL_TRUE;
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76 maxpct = (int) val;
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77 }
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78 }
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79
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80 if (GETVAL(kIOPSMaxCapacityKey, &numval)) {
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81 SInt32 val = -1;
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82 CFNumberGetValue(numval, kCFNumberSInt32Type, &val);
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83 if (val > 0) {
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84 *have_battery = SDL_TRUE;
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85 maxpct = (int) val;
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86 }
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87 }
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88
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89 if (GETVAL(kIOPSTimeToEmptyKey, &numval)) {
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90 SInt32 val = -1;
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91 CFNumberGetValue(numval, kCFNumberSInt32Type, &val);
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92
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93 /* Mac OS X reports 0 minutes until empty if you're plugged in. :( */
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94 if ((val == 0) && (is_ac)) {
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95 val = -1; /* !!! FIXME: calc from timeToFull and capacity? */
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96 }
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97
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98 secs = (int) val;
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99 if (secs > 0) {
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100 secs *= 60; /* value is in minutes, so convert to seconds. */
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101 }
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102 }
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103
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104 if (GETVAL(kIOPSCurrentCapacityKey, &numval)) {
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105 SInt32 val = -1;
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106 CFNumberGetValue(numval, kCFNumberSInt32Type, &val);
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107 pct = (int) val;
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108 }
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109
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110 if ((pct > 0) && (maxpct > 0)) {
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111 pct = (int) ((((double) pct) / ((double) maxpct)) * 100.0);
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112 }
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113
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114 if (pct > 100) {
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115 pct = 100;
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116 }
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117
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118 /*
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119 * We pick the battery that claims to have the most minutes left.
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120 * (failing a report of minutes, we'll take the highest percent.)
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121 */
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122 if ((secs < 0) && (*seconds < 0)) {
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123 if ((pct < 0) && (*percent < 0)) {
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124 choose = SDL_TRUE; /* at least we know there's a battery. */
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125 }
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126 if (pct > *percent) {
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127 choose = SDL_TRUE;
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128 }
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129 } else if (secs > *seconds) {
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130 choose = SDL_TRUE;
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131 }
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132
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133 if (choose) {
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134 *seconds = secs;
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135 *percent = pct;
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136 *charging = charge;
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137 }
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138 }
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139
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140 #undef GETVAL
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141 #undef STRMATCH
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142
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143
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144 SDL_bool
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145 SDL_GetPowerInfo_MacOSX(SDL_PowerState * state, int *seconds, int *percent)
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146 {
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147 CFTypeRef blob = IOPSCopyPowerSourcesInfo();
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148
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149 *seconds = -1;
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150 *percent = -1;
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151 *state = SDL_POWERSTATE_UNKNOWN;
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152
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153 if (blob != NULL) {
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154 CFArrayRef list = IOPSCopyPowerSourcesList(blob);
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155 if (list != NULL) {
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156 /* don't CFRelease() the list items, or dictionaries! */
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157 SDL_bool have_ac = SDL_FALSE;
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158 SDL_bool have_battery = SDL_FALSE;
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159 SDL_bool charging = SDL_FALSE;
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160 const CFIndex total = CFArrayGetCount(list);
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161 CFIndex i;
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162 for (i = 0; i < total; i++) {
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163 CFTypeRef ps = (CFTypeRef) CFArrayGetValueAtIndex(list, i);
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164 CFDictionaryRef dict =
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165 IOPSGetPowerSourceDescription(blob, ps);
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166 if (dict != NULL) {
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167 checkps(dict, &have_ac, &have_battery, &charging,
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168 seconds, percent);
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169 }
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170 }
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171
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172 if (!have_battery) {
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173 *state = SDL_POWERSTATE_NO_BATTERY;
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174 } else if (charging) {
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175 *state = SDL_POWERSTATE_CHARGING;
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176 } else if (have_ac) {
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177 *state = SDL_POWERSTATE_CHARGED;
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178 } else {
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179 *state = SDL_POWERSTATE_ON_BATTERY;
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180 }
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181
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182 CFRelease(list);
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183 }
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184 CFRelease(blob);
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185 }
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186
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187 return SDL_TRUE; /* always the definitive answer on Mac OS X. */
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188 }
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189
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190 #endif /* SDL_POWER_MACOSX */
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191 #endif /* SDL_POWER_DISABLED */
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192
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193 /* vi: set ts=4 sw=4 expandtab: */