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annotate src/power/windows/SDL_syspower.c @ 3475:3bd01435287f

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Added comment for pixel-perfect line workaround.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 21 Nov 2009 07:26:52 +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_WINDOWS
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26
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27 #define WIN32_LEAN_AND_MEAN
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28 #include <windows.h>
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29
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30 #include "SDL_power.h"
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31
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32 SDL_bool
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33 SDL_GetPowerInfo_Windows(SDL_PowerState * state, int *seconds, int *percent)
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34 {
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35 SYSTEM_POWER_STATUS status;
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36 SDL_bool need_details = SDL_FALSE;
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37
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38 /* This API should exist back to Win95 and Windows CE. */
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39 if (!GetSystemPowerStatus(&status)) {
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40 /* !!! FIXME: push GetLastError() into SDL_GetError() */
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41 *state = SDL_POWERSTATE_UNKNOWN;
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42 } else if (status.BatteryFlag == 0xFF) { /* unknown state */
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43 *state = SDL_POWERSTATE_UNKNOWN;
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44 } else if (status.BatteryFlag & (1 << 7)) { /* no battery */
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45 *state = SDL_POWERSTATE_NO_BATTERY;
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46 } else if (status.BatteryFlag & (1 << 3)) { /* charging */
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47 *state = SDL_POWERSTATE_CHARGING;
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48 need_details = SDL_TRUE;
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49 } else if (status.ACLineStatus == 1) {
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50 *state = SDL_POWERSTATE_CHARGED; /* on AC, not charging. */
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51 need_details = SDL_TRUE;
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52 } else {
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53 *state = SDL_POWERSTATE_ON_BATTERY; /* not on AC. */
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54 need_details = SDL_TRUE;
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55 }
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56
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57 *percent = -1;
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58 *seconds = -1;
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59 if (need_details) {
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60 const int pct = (int) status.BatteryLifePercent;
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61 const int secs = (int) status.BatteryLifeTime;
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62
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63 if (pct != 255) { /* 255 == unknown */
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64 *percent = (pct > 100) ? 100 : pct; /* clamp between 0%, 100% */
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65 }
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66 if (secs != 0xFFFFFFFF) { /* ((DWORD)-1) == unknown */
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67 *seconds = secs;
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68 }
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69 }
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70
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71 return SDL_TRUE; /* always the definitive answer on Windows. */
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72 }
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73
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74 #endif /* SDL_POWER_WINDOWS */
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75 #endif /* SDL_POWER_DISABLED */
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76
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77 /* vi: set ts=4 sw=4 expandtab: */