Render Ash material design battery image icon without PNGs

ash/common/system/chromeos/power/power_status.h

Index: ash/common/system/chromeos/power/power_status.h
diff --git a/ash/common/system/chromeos/power/power_status.h b/ash/common/system/chromeos/power/power_status.h
index 26c4b1947ad5f8b34cf4c6feb463cbadbba7a480..b9e3d8345961d77601487ab223d6bd01dc0e8f72 100644
--- a/ash/common/system/chromeos/power/power_status.h
+++ b/ash/common/system/chromeos/power/power_status.h
@@ -24,6 +24,15 @@ namespace ash {
 // available to interested classes within Ash.
 class ASH_EXPORT PowerStatus : public chromeos::PowerManagerClient::Observer {
  public:
+  // Types of badges which can be drawn on top of a battery icon.
+  enum IconBadge {
+    ICON_BADGE_NONE,
+    ICON_BADGE_ALERT,
+    ICON_BADGE_BOLT,
+    ICON_BADGE_X,
+    ICON_BADGE_UNRELIABLE
+  };
+
   // Different styles of battery icons.
   enum IconSet {
     ICON_LIGHT,
@@ -67,24 +76,40 @@ class ASH_EXPORT PowerStatus : public chromeos::PowerManagerClient::Observer {
   // updating onscreen icons (GetBatteryImage() creates a new image on each
   // call).
   struct BatteryImageInfo {
-    BatteryImageInfo() : resource_id(-1), offset(-1), index(-1) {}
+    BatteryImageInfo()
+        : resource_id(-1),
+          offset(-1),
+          index(-1),
+          icon_badge(ICON_BADGE_NONE),
+          charge_level(-1) {}
+
+    bool operator==(const BatteryImageInfo& o) const;
 
-    bool operator==(const BatteryImageInfo& o) const {
-      return resource_id == o.resource_id && offset == o.offset &&
-             index == o.index;
-    }
     bool operator!=(const BatteryImageInfo& o) const { return !(*this == o); }
 
     // Resource ID of the image containing the specific battery icon to use.
+    // Only used in non-MD.
     int resource_id;
 
     // Horizontal offset in the battery icon array image. The USB / "unreliable
     // charging" image has a single column of icons; the other image contains a
     // "battery" column on the left and a "line power" column on the right.
+    // Only used in non-MD.
     int offset;
 
-    // Vertical offset corresponding to the current battery level.
+    // Vertical offset corresponding to the current battery level. Only used in
+    // non-MD.
     int index;
+
+    // The badge (lightning bolt, exclamation mark, etc) that should be drawn
+    // on top of the battery icon. Only used for MD.
+    // TODO(tdanderson): Consider using gfx::VectorIconId instead of this enum
+    // once all possible badges have been vectorized. See crbug.com/617298.
+    IconBadge icon_badge;
+
+    // A value between 0 and kBatteryImageHeightMD representing the height
+    // of the battery's charge level in dp. Only used for MD.
+    int charge_level;
   };
 
   // Maximum battery time-to-full or time-to-empty that should be displayed
@@ -92,6 +117,11 @@ class ASH_EXPORT PowerStatus : public chromeos::PowerManagerClient::Observer {
   // get very large; avoid displaying these large numbers.
   static const int kMaxBatteryTimeToDisplaySec;
 
+  // An alert badge is drawn over the material design battery icon if the
+  // battery is not connected to a charger and has less than
+  // |kCriticalBatteryChargePercentageMd| percentage of charge remaining.
+  static const double kCriticalBatteryChargePercentageMd;
+
   // Sets the global instance. Must be called before any calls to Get().
   static void Initialize();
 
@@ -193,8 +223,23 @@ class ASH_EXPORT PowerStatus : public chromeos::PowerManagerClient::Observer {
   // returned by this method to avoid creating new images unnecessarily.
   BatteryImageInfo GetBatteryImageInfo(IconSet icon_set) const;
 
+  // A helper function called by GetBatteryImageInfo(). Populates the
+  // MD-specific fields of |info|.
+  void CalculateBatteryImageInfoMd(BatteryImageInfo* info) const;
+
+  // A helper function called by GetBatteryImageInfo(). Populates the
+  // non-MD-specific fields of |info|.
+  void CalculateBatteryImageInfoNonMd(BatteryImageInfo* info,
+                                      const IconSet& icon_set) const;
+
   // Creates a new image that should be shown for the battery's current state.
-  gfx::ImageSkia GetBatteryImage(IconSet icon_set) const;
+  gfx::ImageSkia GetBatteryImage(const BatteryImageInfo& info) const;
+
+  // A version of GetBatteryImage() that is used when material design is not
+  // enabled.
+  // TODO(tdanderson): Remove this once material design is enabled by default.
+  // See crbug.com/614453.
+  gfx::ImageSkia GetBatteryImageNonMd(const BatteryImageInfo& info) const;
 
   // Returns an string describing the current state for accessibility.
   base::string16 GetAccessibleNameString(bool full_description) const;