Fix metrics on Windows.

src/core/SkScalerContext.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkScalerContext_DEFINED
 #define SkScalerContext_DEFINED
 
@@ skipping 116 matching lines @@
         kSubpixelPositioning_Flag = 0x0010,
         kAutohinting_Flag         = 0x0020,
         kVertical_Flag            = 0x0040,
 
         // together, these two flags resulting in a two bit value which matches
         // up with the SkPaint::Hinting enum.
         kHinting_Shift            = 7, // to shift into the other flags above
         kHintingBit1_Flag         = 0x0080,
         kHintingBit2_Flag         = 0x0100,
 
-        // these should only ever be set if fMaskFormat is LCD16 or LCD32
+        // Pixel geometry information.
+        // only meaningful if fMaskFormat is LCD16 or LCD32
         kLCD_Vertical_Flag        = 0x0200,    // else Horizontal
         kLCD_BGROrder_Flag        = 0x0400,    // else RGB order
 
-        // Generate A8 from LCD source (for GDI), only meaningful if fMaskFormat is kA8
-        // Perhaps we can store this (instead) in fMaskFormat, in hight bit?
-        kGenA8FromLCD_Flag        = 0x0800,
+        // Generate A8 from LCD source (for GDI and CoreGraphics).
+        // only meaningful if fMaskFormat is kA8
+        kGenA8FromLCD_Flag        = 0x0800, // could be 0x200 (bit meaning dependent on fMaskFormat)
     };
 
     // computed values
     enum {
         kHinting_Mask   = kHintingBit1_Flag | kHintingBit2_Flag,
     };
 
 
     SkScalerContext(SkTypeface*, const SkDescriptor*);
     virtual ~SkScalerContext();
@@ skipping 144 matching lines @@
     return static_cast<SkPaint::Hinting>(hint);
 }
 
 void SkScalerContextRec::setHinting(SkPaint::Hinting hinting) {
     fFlags = (fFlags & ~SkScalerContext::kHinting_Mask) |
                                 (hinting << SkScalerContext::kHinting_Shift);
 }
 
 
 #endif