Fix a bug in the Clamp in X direction tiling.

The code mixed up which end of the span was cut and preserved in the
sequence of span breaks.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2145193002

Review-Url: https://codereview.chromium.org/2145193002

1 files changed, 8 insertions, 9 deletions

diff --git a/src/core/SkLinearBitmapPipeline_tile.h b/src/core/SkLinearBitmapPipeline_tile.h
index 6fe64f1bce..39d79a0061 100644
--- a/src/core/SkLinearBitmapPipeline_tile.h
+++ b/src/core/SkLinearBitmapPipeline_tile.h
@@ -90,19 +90,18 @@ public:
                 next->pointSpan(span);
             }
         } else {
-            Span center = span.breakAt(fXMax, dx);
-
-            if (!span.isEmpty()) {
-                span.clampToSinglePixel({fXMax - 1, y});
-                next->pointSpan(span);
+            Span rightClamped = span.breakAt(fXMax, dx);
+            if (!rightClamped.isEmpty()) {
+                rightClamped.clampToSinglePixel({fXMax - 1, y});
+                next->pointSpan(rightClamped);
             }
-            Span leftEdge = center.breakAt(0.0f, dx);
+            Span center = span.breakAt(0.0f, dx);
             if (!center.isEmpty()) {
                 next->pointSpan(center);
             }
-            if (!leftEdge.isEmpty()) {
-                leftEdge.clampToSinglePixel({0.0f, y});
-                next->pointSpan(leftEdge);
+            if (!span.isEmpty()) {
+                span.clampToSinglePixel({0.0f, y});
+                next->pointSpan(span);
             }
         }
         return true;