Revert of Support pixel antialising in DirectWrite.

src/ports/SkTypeface_win_dw.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkTypes.h"
 #if defined(SK_BUILD_FOR_WIN32)
 
@@ skipping 234 matching lines @@
 }
 
 SkScalerContext* DWriteFontTypeface::onCreateScalerContext(const SkScalerContextEffects& effects,
                                                            const SkDescriptor* desc) const {
     return new SkScalerContext_DW(const_cast<DWriteFontTypeface*>(this), effects, desc);
 }
 
 void DWriteFontTypeface::onFilterRec(SkScalerContext::Rec* rec) const {
     if (rec->fFlags & SkScalerContext::kLCD_Vertical_Flag) {
         rec->fMaskFormat = SkMask::kA8_Format;
-        rec->fFlags |= SkScalerContext::kGenA8FromLCD_Flag;
     }
 
     unsigned flagsWeDontSupport = SkScalerContext::kVertical_Flag |
                                   SkScalerContext::kDevKernText_Flag |
                                   SkScalerContext::kForceAutohinting_Flag |
                                   SkScalerContext::kEmbolden_Flag |
                                   SkScalerContext::kLCD_Vertical_Flag;
     rec->fFlags &= ~flagsWeDontSupport;
 
     SkPaint::Hinting h = rec->getHinting();
-    // DirectWrite2 allows for hinting to be turned off. Force everything else to normal.
-    if (h != SkPaint::kNo_Hinting || !fFactory2 || !fDWriteFontFace2) {
-        h = SkPaint::kNormal_Hinting;
-    }
+    // DirectWrite does not provide for hinting hints.
+    h = SkPaint::kSlight_Hinting;
     rec->setHinting(h);
 
 #if defined(SK_FONT_HOST_USE_SYSTEM_SETTINGS)
     IDWriteFactory* factory = sk_get_dwrite_factory();
     if (factory != nullptr) {
         SkTScopedComPtr<IDWriteRenderingParams> defaultRenderingParams;
         if (SUCCEEDED(factory->CreateRenderingParams(&defaultRenderingParams))) {
             float gamma = defaultRenderingParams->GetGamma();
             rec->setDeviceGamma(gamma);
             rec->setPaintGamma(gamma);
@@ skipping 181 matching lines @@
                 SkAdvancedTypefaceMetrics::GetAdvance([borrowedFontFace](int gId, int16_t* data) {
                     return getWidthAdvance(borrowedFontFace, gId, data);
                 })
             );
         }
     }
 
     return info;
 }
 #endif//defined(SK_BUILD_FOR_WIN32)