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@@ -79,6 +79,9 @@ typedef enum SDL_PowerState
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* It's possible a platform can only report battery percentage or time left
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* but not both.
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*
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+ * On some platforms, retrieving power supply details might be expensive. It
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+ * is not recommended to invoke this function every frame.
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+ *
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* \param seconds a pointer filled in with the seconds of battery life left,
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* or NULL to ignore. This will be filled in with -1 if we
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* can't determine a value or there is no battery.
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Vittorio Romeo