Support subpixel layout for borders.

third_party/WebKit/Source/core/paint/ObjectPainter.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ObjectPainter_h
 #define ObjectPainter_h
 
 #include "core/style/ComputedStyleConstants.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "wtf/Allocator.h"
@@ skipping 13 matching lines @@
  public:
   ObjectPainter(const LayoutObject& layoutObject)
       : m_layoutObject(layoutObject) {}
 
   void paintOutline(const PaintInfo&, const LayoutPoint& paintOffset);
   void paintInlineChildrenOutlines(const PaintInfo&,
                                    const LayoutPoint& paintOffset);
   void addPDFURLRectIfNeeded(const PaintInfo&, const LayoutPoint& paintOffset);
 
   static void drawLineForBoxSide(GraphicsContext&,
-                                 int x1,
-                                 int y1,
-                                 int x2,
-                                 int y2,
+                                 float x1,
+                                 float y1,
+                                 float x2,
+                                 float y2,
                                  BoxSide,
                                  Color,
                                  EBorderStyle,
                                  int adjbw1,
                                  int adjbw2,
                                  bool antialias = false);
 
   // Paints the object atomically as if it created a new stacking context, for:
   // - inline blocks, inline tables, inline-level replaced elements (Section
   //   7.2.1.4 in http://www.w3.org/TR/CSS2/zindex.html#painting-order),
@@ skipping 39 matching lines @@
                                         EBorderStyle,
                                         bool antialias);
   static void drawDoubleBoxSide(GraphicsContext&,
                                 int x1,
                                 int y1,
                                 int x2,
                                 int y2,
                                 int length,
                                 BoxSide,
                                 Color,
-                                int thickness,
+                                float thickness,
                                 int adjacentWidth1,
                                 int adjacentWidth2,
                                 bool antialias);
   static void drawRidgeOrGrooveBoxSide(GraphicsContext&,
                                        int x1,
                                        int y1,
                                        int x2,
                                        int y2,
                                        BoxSide,
                                        Color,
@@ skipping 15 matching lines @@
 #if DCHECK_IS_ON()
   void doCheckPaintOffset(const PaintInfo&, const LayoutPoint& paintOffset);
 #endif
 
   const LayoutObject& m_layoutObject;
 };
 
 }  // namespace blink
 
 #endif