[DirectWrite] Force fully aliased text for certain fonts at small sizes

Source/platform/fonts/win/FontPlatformDataWin.cpp

 /*
  * Copyright (C) 2006, 2007 Apple Computer, Inc.
  * Copyright (c) 2006, 2007, 2008, 2009, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 44 matching lines @@
     uint32_t textFlags = paintTextFlags();
     uint32_t flags = paint->getFlags();
     static const uint32_t textFlagsMask = SkPaint::kAntiAlias_Flag |
         SkPaint::kLCDRenderText_Flag |
         SkPaint::kGenA8FromLCD_Flag;
     flags &= ~textFlagsMask;
 
     if (ts <= kMaxSizeForEmbeddedBitmap)
         flags |= SkPaint::kEmbeddedBitmapText_Flag;
 
-    if (m_useSubpixelPositioning)
-        flags |= SkPaint::kSubpixelText_Flag;
+    if (ts >= m_minSizeForAntiAlias) {
+        if (m_useSubpixelPositioning)
+            flags |= SkPaint::kSubpixelText_Flag;
 
-    // Only set painting flags when we're actually painting.
-    if (context && !context->couldUseLCDRenderedText()) {
-        textFlags &= ~SkPaint::kLCDRenderText_Flag;
-        // If we *just* clear our request for LCD, then GDI seems to
-        // sometimes give us AA text, and sometimes give us BW text. Since the
-        // original intent was LCD, we want to force AA (rather than BW), so we
-        // add a special bit to tell Skia to do its best to avoid the BW: by
-        // drawing LCD offscreen and downsampling that to AA.
-        textFlags |= SkPaint::kGenA8FromLCD_Flag;
+        // Only set painting flags when we're actually painting.
+        if (context && !context->couldUseLCDRenderedText()) {
+            textFlags &= ~SkPaint::kLCDRenderText_Flag;
+            // If we *just* clear our request for LCD, then GDI seems to
+            // sometimes give us AA text, and sometimes give us BW text. Since the
+            // original intent was LCD, we want to force AA (rather than BW), so we
+            // add a special bit to tell Skia to do its best to avoid the BW: by
+            // drawing LCD offscreen and downsampling that to AA.
+            textFlags |= SkPaint::kGenA8FromLCD_Flag;
+        }
+        SkASSERT(!(textFlags & ~textFlagsMask));
+        flags |= textFlags;
     }
-    SkASSERT(!(textFlags & ~textFlagsMask));
-    flags |= textFlags;
 
     paint->setFlags(flags);
 }
 
 // Lookup the current system settings for font smoothing.
 // We cache these values for performance, but if the browser has a way to be
 // notified when these change, we could re-query them at that time.
 static uint32_t getSystemTextFlags()
 {
     static bool gInited;
@@ skipping 45 matching lines @@
 {
     m_paintTextFlags = computePaintTextFlags(fontFamilyName());
 }
 
 bool FontPlatformData::defaultUseSubpixelPositioning()
 {
     return FontCache::fontCache()->useSubpixelPositioning();
 }
 
 } // namespace WebCore