Move dither toggle logic into common helper functions, to make it easier to

change their behavior later. No functional change.
Review URL: https://codereview.appspot.com/7241063

git-svn-id: http://skia.googlecode.com/svn/trunk@7525 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 3 insertions, 3 deletions

diff --git a/src/effects/gradients/SkSweepGradient.cpp b/src/effects/gradients/SkSweepGradient.cpp
index 3cdac8577b..db18521066 100644
--- a/src/effects/gradients/SkSweepGradient.cpp
+++ b/src/effects/gradients/SkSweepGradient.cpp
@@ -337,7 +337,7 @@ void SkSweepGradient::shadeSpan16(int x, int y, uint16_t* SK_RESTRICT dstC,
     SkMatrix::MapXYProc proc = fDstToIndexProc;
     const SkMatrix&     matrix = fDstToIndex;
     const uint16_t* SK_RESTRICT cache = this->getCache16();
-    int                 toggle = ((x ^ y) & 1) * kDitherStride16;
+    int                 toggle = init_dither_toggle16(x, y);
     SkPoint             srcPt;
 
     if (fDstToIndexClass != kPerspective_MatrixClass) {
@@ -361,7 +361,7 @@ void SkSweepGradient::shadeSpan16(int x, int y, uint16_t* SK_RESTRICT dstC,
         for (; count > 0; --count) {
             int index = SkATan2_255(fy, fx) >> (8 - kCache16Bits);
             *dstC++ = cache[toggle + index];
-            toggle ^= kDitherStride16;
+            toggle = next_dither_toggle16(toggle);
             fx += dx;
             fy += dy;
         }
@@ -373,7 +373,7 @@ void SkSweepGradient::shadeSpan16(int x, int y, uint16_t* SK_RESTRICT dstC,
             int index = SkATan2_255(srcPt.fY, srcPt.fX);
             index >>= (8 - kCache16Bits);
             *dstC++ = cache[toggle + index];
-            toggle ^= kDitherStride16;
+            toggle = next_dither_toggle16(toggle);
         }
     }
 }