• zandobersek@gmail.com's avatar
    [GTK] Add a UPower-based BatteryProvider · 0414f142
    zandobersek@gmail.com authored
    https://bugs.webkit.org/show_bug.cgi?id=115719
    
    Reviewed by Martin Robinson.
    
    Source/Platform: 
    
    * GNUmakefile.am: Add the Source/WebCore/platform/glib directory to the list of directories searched
    for header inclusion. Add the upower-glib dependency CFLAGS to the list of libPlatform's CPPFLAGS.
    
    Source/WebCore: 
    
    Introduce the BatteryProviderUPower, a provider of the system's battery status that produces the information
    using the upower-glib library.
    
    The BatteryProviderUPower creates a new UPower client when the provider should start emitting updates and hooks
    up to device alteration signals. These only fire recalculation of the battery status when a battery device is altered.
    
    When recalculating, every battery device is taken into account, accumulating the energy capacities when both empty
    and full, the current rate of energy charging/discharging, and the battery status (whether the device is charging or
    discharging). This gives a set of data that covers the overall battery status of the system.
    
    This data is then used to calculate the battery status as perceived by the WebCore implementation. Charging is determined
    by examining the integral sign of the current combined energy rate. Charging and discharging times are calculated, when
    appropriate, by dividing the chargable/dischargable capacity with the current combined energy rate. The battery level is
    calculated by dividing the current energy capacity with the full energy capacity (i.e. the combined capacity of all
    the batteries that the system possesses). The status is (indirectly) passed onto BatteryManager by invoking the
    updateBatteryStatus method on the client, with the first parameter representing the battery charging/discharging state,
    the second parameter representing the time left until the battery is fully charged (when charging) or fully
    depleted (when discharging), and the third parameter representing the current battery level.
    
    Whenever the implementation cannot provide any information about the battery status of the system, the client's
    updateBatteryStatus method is invoked with the first parameter reporting the unavailability of any information
    about the battery status. The other two parameters can be omitted as they default to 0 when not given and are neither
    available nor useful in such circumstances. The client should handle such an update by reporting the 'default' battery
    status - charging, the battery level being at 1.0 and both the charging and discharging time having the value of
    the positive infinity (as per the Battery Status API specification).
    
    The implementation is heavily inspired by a similar approach to calculating battery status in GNOME Settings Daemon.
    
    No new tests - no new functionality. The feature is not yet enabled. When enabled, the relevant tests pass.
    
    * GNUmakefile.list.am: Add the BatteryProviderUPower(Client) build targets.
    * platform/glib/BatteryProviderUPower.cpp: Added.
    (powerDeviceAlterationCallback):
    (BatteryProviderUPower::BatteryProviderUPower):
    (BatteryProviderUPower::startUpdating):
    (BatteryProviderUPower::stopUpdating):
    (BatteryProviderUPower::updateBatteryStatus):
    * platform/glib/BatteryProviderUPower.h: Added.
    (WebCore):
    (BatteryProviderUPower):
    * platform/glib/BatteryProviderUPowerClient.h: Added.
    (WebCore):
    (BatteryProviderUPowerClient):
    
    Source/WebKit/gtk: 
    
    * GNUmakefile.am: Link the libwebkigtk library against the upower-glib library.
    
    Source/WebKit2: 
    
    * GNUmakefile.am: Link the libwebkit2gtk library against the upower-glib library.
    
    
    git-svn-id: http://svn.webkit.org/repository/webkit/trunk@160444 268f45cc-cd09-0410-ab3c-d52691b4dbfc
    0414f142
GNUmakefile.am 5.43 KB