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SDL_syspower.c (2686B)

      1 /*
      2   Simple DirectMedia Layer
      3   Copyright (C) 1997-2020 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_WINDOWS
     25 
     26 #include "../../core/windows/SDL_windows.h"
     27 
     28 #include "SDL_power.h"
     29 
     30 SDL_bool
     31 SDL_GetPowerInfo_Windows(SDL_PowerState * state, int *seconds, int *percent)
     32 {
     33     SYSTEM_POWER_STATUS status;
     34     SDL_bool need_details = SDL_FALSE;
     35 
     36     /* This API should exist back to Win95. */
     37     if (!GetSystemPowerStatus(&status))
     38     {
     39         /* !!! FIXME: push GetLastError() into SDL_GetError() */
     40         *state = SDL_POWERSTATE_UNKNOWN;
     41     } else if (status.BatteryFlag == 0xFF) {    /* unknown state */
     42         *state = SDL_POWERSTATE_UNKNOWN;
     43     } else if (status.BatteryFlag & (1 << 7)) { /* no battery */
     44         *state = SDL_POWERSTATE_NO_BATTERY;
     45     } else if (status.BatteryFlag & (1 << 3)) { /* charging */
     46         *state = SDL_POWERSTATE_CHARGING;
     47         need_details = SDL_TRUE;
     48     } else if (status.ACLineStatus == 1) {
     49         *state = SDL_POWERSTATE_CHARGED;        /* on AC, not charging. */
     50         need_details = SDL_TRUE;
     51     } else {
     52         *state = SDL_POWERSTATE_ON_BATTERY;     /* not on AC. */
     53         need_details = SDL_TRUE;
     54     }
     55 
     56     *percent = -1;
     57     *seconds = -1;
     58     if (need_details) {
     59         const int pct = (int) status.BatteryLifePercent;
     60         const int secs = (int) status.BatteryLifeTime;
     61 
     62         if (pct != 255) {       /* 255 == unknown */
     63             *percent = (pct > 100) ? 100 : pct; /* clamp between 0%, 100% */
     64         }
     65         if (secs != 0xFFFFFFFF) {       /* ((DWORD)-1) == unknown */
     66             *seconds = secs;
     67         }
     68     }
     69 
     70     return SDL_TRUE;            /* always the definitive answer on Windows. */
     71 }
     72 
     73 #endif /* SDL_POWER_WINDOWS */
     74 #endif /* SDL_POWER_DISABLED */
     75 
     76 /* vi: set ts=4 sw=4 expandtab: */