src/power/macosx/SDL_syspower.c
author Alex Szpakowski
Sat, 16 May 2015 12:05:42 -0300
changeset 9600 d52c2129c9ac
parent 8149 681eb46b8ac4
child 9619 b94b6d0bff0f
permissions -rw-r--r--
Mac: Use CoreFoundation headers instead of Carbon headers, in GetPowerInfo code.
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
     4 
     5   This software is provided 'as-is', without any express or implied
     6   warranty.  In no event will the authors be held liable for any damages
     7   arising from the use of this software.
     8 
     9   Permission is granted to anyone to use this software for any purpose,
    10   including commercial applications, and to alter it and redistribute it
    11   freely, subject to the following restrictions:
    12 
    13   1. The origin of this software must not be misrepresented; you must not
    14      claim that you wrote the original software. If you use this software
    15      in a product, an acknowledgment in the product documentation would be
    16      appreciated but is not required.
    17   2. Altered source versions must be plainly marked as such, and must not be
    18      misrepresented as being the original software.
    19   3. This notice may not be removed or altered from any source distribution.
    20 */
    21 #include "../../SDL_internal.h"
    22 
    23 #ifndef SDL_POWER_DISABLED
    24 #if SDL_POWER_MACOSX
    25 
    26 #include <CoreFoundation/CoreFoundation.h>
    27 #include <IOKit/ps/IOPowerSources.h>
    28 #include <IOKit/ps/IOPSKeys.h>
    29 
    30 #include "SDL_power.h"
    31 
    32 /* CoreFoundation is so verbose... */
    33 #define STRMATCH(a,b) (CFStringCompare(a, b, 0) == kCFCompareEqualTo)
    34 #define GETVAL(k,v) \
    35     CFDictionaryGetValueIfPresent(dict, CFSTR(k), (const void **) v)
    36 
    37 /* Note that AC power sources also include a laptop battery it is charging. */
    38 static void
    39 checkps(CFDictionaryRef dict, SDL_bool * have_ac, SDL_bool * have_battery,
    40         SDL_bool * charging, int *seconds, int *percent)
    41 {
    42     CFStringRef strval;         /* don't CFRelease() this. */
    43     CFBooleanRef bval;
    44     CFNumberRef numval;
    45     SDL_bool charge = SDL_FALSE;
    46     SDL_bool choose = SDL_FALSE;
    47     SDL_bool is_ac = SDL_FALSE;
    48     int secs = -1;
    49     int maxpct = -1;
    50     int pct = -1;
    51 
    52     if ((GETVAL(kIOPSIsPresentKey, &bval)) && (bval == kCFBooleanFalse)) {
    53         return;                 /* nothing to see here. */
    54     }
    55 
    56     if (!GETVAL(kIOPSPowerSourceStateKey, &strval)) {
    57         return;
    58     }
    59 
    60     if (STRMATCH(strval, CFSTR(kIOPSACPowerValue))) {
    61         is_ac = *have_ac = SDL_TRUE;
    62     } else if (!STRMATCH(strval, CFSTR(kIOPSBatteryPowerValue))) {
    63         return;                 /* not a battery? */
    64     }
    65 
    66     if ((GETVAL(kIOPSIsChargingKey, &bval)) && (bval == kCFBooleanTrue)) {
    67         charge = SDL_TRUE;
    68     }
    69 
    70     if (GETVAL(kIOPSMaxCapacityKey, &numval)) {
    71         SInt32 val = -1;
    72         CFNumberGetValue(numval, kCFNumberSInt32Type, &val);
    73         if (val > 0) {
    74             *have_battery = SDL_TRUE;
    75             maxpct = (int) val;
    76         }
    77     }
    78 
    79     if (GETVAL(kIOPSMaxCapacityKey, &numval)) {
    80         SInt32 val = -1;
    81         CFNumberGetValue(numval, kCFNumberSInt32Type, &val);
    82         if (val > 0) {
    83             *have_battery = SDL_TRUE;
    84             maxpct = (int) val;
    85         }
    86     }
    87 
    88     if (GETVAL(kIOPSTimeToEmptyKey, &numval)) {
    89         SInt32 val = -1;
    90         CFNumberGetValue(numval, kCFNumberSInt32Type, &val);
    91 
    92         /* Mac OS X reports 0 minutes until empty if you're plugged in. :( */
    93         if ((val == 0) && (is_ac)) {
    94             val = -1;           /* !!! FIXME: calc from timeToFull and capacity? */
    95         }
    96 
    97         secs = (int) val;
    98         if (secs > 0) {
    99             secs *= 60;         /* value is in minutes, so convert to seconds. */
   100         }
   101     }
   102 
   103     if (GETVAL(kIOPSCurrentCapacityKey, &numval)) {
   104         SInt32 val = -1;
   105         CFNumberGetValue(numval, kCFNumberSInt32Type, &val);
   106         pct = (int) val;
   107     }
   108 
   109     if ((pct > 0) && (maxpct > 0)) {
   110         pct = (int) ((((double) pct) / ((double) maxpct)) * 100.0);
   111     }
   112 
   113     if (pct > 100) {
   114         pct = 100;
   115     }
   116 
   117     /*
   118      * We pick the battery that claims to have the most minutes left.
   119      *  (failing a report of minutes, we'll take the highest percent.)
   120      */
   121     if ((secs < 0) && (*seconds < 0)) {
   122         if ((pct < 0) && (*percent < 0)) {
   123             choose = SDL_TRUE;  /* at least we know there's a battery. */
   124         }
   125         if (pct > *percent) {
   126             choose = SDL_TRUE;
   127         }
   128     } else if (secs > *seconds) {
   129         choose = SDL_TRUE;
   130     }
   131 
   132     if (choose) {
   133         *seconds = secs;
   134         *percent = pct;
   135         *charging = charge;
   136     }
   137 }
   138 
   139 #undef GETVAL
   140 #undef STRMATCH
   141 
   142 
   143 SDL_bool
   144 SDL_GetPowerInfo_MacOSX(SDL_PowerState * state, int *seconds, int *percent)
   145 {
   146     CFTypeRef blob = IOPSCopyPowerSourcesInfo();
   147 
   148     *seconds = -1;
   149     *percent = -1;
   150     *state = SDL_POWERSTATE_UNKNOWN;
   151 
   152     if (blob != NULL) {
   153         CFArrayRef list = IOPSCopyPowerSourcesList(blob);
   154         if (list != NULL) {
   155             /* don't CFRelease() the list items, or dictionaries! */
   156             SDL_bool have_ac = SDL_FALSE;
   157             SDL_bool have_battery = SDL_FALSE;
   158             SDL_bool charging = SDL_FALSE;
   159             const CFIndex total = CFArrayGetCount(list);
   160             CFIndex i;
   161             for (i = 0; i < total; i++) {
   162                 CFTypeRef ps = (CFTypeRef) CFArrayGetValueAtIndex(list, i);
   163                 CFDictionaryRef dict =
   164                     IOPSGetPowerSourceDescription(blob, ps);
   165                 if (dict != NULL) {
   166                     checkps(dict, &have_ac, &have_battery, &charging,
   167                             seconds, percent);
   168                 }
   169             }
   170 
   171             if (!have_battery) {
   172                 *state = SDL_POWERSTATE_NO_BATTERY;
   173             } else if (charging) {
   174                 *state = SDL_POWERSTATE_CHARGING;
   175             } else if (have_ac) {
   176                 *state = SDL_POWERSTATE_CHARGED;
   177             } else {
   178                 *state = SDL_POWERSTATE_ON_BATTERY;
   179             }
   180 
   181             CFRelease(list);
   182         }
   183         CFRelease(blob);
   184     }
   185 
   186     return SDL_TRUE;            /* always the definitive answer on Mac OS X. */
   187 }
   188 
   189 #endif /* SDL_POWER_MACOSX */
   190 #endif /* SDL_POWER_DISABLED */
   191 
   192 /* vi: set ts=4 sw=4 expandtab: */