Remove 1/2 pixel offsets for distance field layout.

src/gpu/GrDistanceFieldTextContext.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrDistanceFieldTextContext.h"
 #include "GrAtlas.h"
 #include "GrDrawTarget.h"
@@ skipping 398 matching lines @@
 
         if (fSkPaint.getTextAlign() == SkPaint::kCenter_Align) {
             alignX = SkScalarHalf(alignX);
             alignY = SkScalarHalf(alignY);
         }
 
         x -= alignX;
         y -= alignY;
     }
 
-    SkFixed fx = SkScalarToFixed(x) + SK_FixedHalf;
-    SkFixed fy = SkScalarToFixed(y) + SK_FixedHalf;
+    SkFixed fx = SkScalarToFixed(x);
+    SkFixed fy = SkScalarToFixed(y);
     SkFixed fixedScale = SkScalarToFixed(sizeRatio);
     while (text < stop) {
         const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
 
         if (glyph.fWidth) {
             this->drawPackedGlyph(GrGlyph::Pack(glyph.getGlyphID(),
                                                 glyph.getSubXFixed(),
                                                 glyph.getSubYFixed()),
-                                  SkFixedFloorToFixed(fx),
-                                  SkFixedFloorToFixed(fy),
+                                  fx,
+                                  fy,
                                   fontScaler);
         }
 
         fx += SkFixedMul_portable(glyph.fAdvanceX, fixedScale);
         fy += SkFixedMul_portable(glyph.fAdvanceY, fixedScale);
     }
 
     this->finish();
 }
 
@@ skipping 25 matching lines @@
             // the last 2 parameters are ignored
             const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
 
             if (glyph.fWidth) {
                 SkScalar x = pos[0];
                 SkScalar y = scalarsPerPosition == 1 ? constY : pos[1];
 
                 this->drawPackedGlyph(GrGlyph::Pack(glyph.getGlyphID(),
                                                     glyph.getSubXFixed(),
                                                     glyph.getSubYFixed()),
-                                      SkScalarToFixed(x) + SK_FixedHalf, //d1g.fHalfSampleX,
-                                      SkScalarToFixed(y) + SK_FixedHalf, //d1g.fHalfSampleY,
+                                      SkScalarToFixed(x),
+                                      SkScalarToFixed(y),
                                       fontScaler);
             }
             pos += scalarsPerPosition;
         }
     } else {
         int alignShift = SkPaint::kCenter_Align == fSkPaint.getTextAlign() ? 1 : 0;
         while (text < stop) {
             // the last 2 parameters are ignored
             const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
 
             if (glyph.fWidth) {
                 SkScalar x = pos[0];
                 SkScalar y = scalarsPerPosition == 1 ? constY : pos[1];
 
                 this->drawPackedGlyph(GrGlyph::Pack(glyph.getGlyphID(),
                                                     glyph.getSubXFixed(),
                                                     glyph.getSubYFixed()),
-                                      SkScalarToFixed(x) - (glyph.fAdvanceX >> alignShift)
-                                        + SK_FixedHalf, //d1g.fHalfSampleX,
-                                      SkScalarToFixed(y) - (glyph.fAdvanceY >> alignShift)
-                                        + SK_FixedHalf, //d1g.fHalfSampleY,
+                                      SkScalarToFixed(x) - (glyph.fAdvanceX >> alignShift),
+                                      SkScalarToFixed(y) - (glyph.fAdvanceY >> alignShift),
                                       fontScaler);
             }
             pos += scalarsPerPosition;
         }
     }
 
     this->finish();
 }