some utils for rect and matrix

src/core/SkScan_Antihair.cpp

 
 /*
  * Copyright 2011 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.
  */
 
 
 #include "SkScan.h"
@@ skipping 607 matching lines @@
         clipBounds.set(clip->getBounds());
         /*  We perform integral clipping later on, but we do a scalar clip first
             to ensure that our coordinates are expressible in fixed/integers.
 
             antialiased hairlines can draw up to 1/2 of a pixel outside of
             their bounds, so we need to outset the clip before calling the
             clipper. To make the numerics safer, we outset by a whole pixel,
             since the 1/2 pixel boundary is important to the antihair blitter,
             we don't want to risk numerical fate by chopping on that edge.
          */
-        clipBounds.inset(-SK_Scalar1, -SK_Scalar1);
+        clipBounds.outset(SK_Scalar1, SK_Scalar1);
 
         if (!SkLineClipper::IntersectLine(pts, clipBounds, pts)) {
             return;
         }
     }
 
     SkFDot6 x0 = SkScalarToFDot6(pts[0].fX);
     SkFDot6 y0 = SkScalarToFDot6(pts[0].fY);
     SkFDot6 x1 = SkScalarToFDot6(pts[1].fX);
     SkFDot6 y1 = SkScalarToFDot6(pts[1].fY);
@@ skipping 426 matching lines @@
 
 void SkScan::AntiFrameRect(const SkRect& r, const SkPoint& strokeSize,
                            const SkRasterClip& clip, SkBlitter* blitter) {
     if (clip.isBW()) {
         AntiFrameRect(r, strokeSize, &clip.bwRgn(), blitter);
     } else {
         SkAAClipBlitterWrapper wrap(clip, blitter);
         AntiFrameRect(r, strokeSize, &wrap.getRgn(), wrap.getBlitter());
     }
 }