Revert of Redo Tiling

src/core/SkLinearBitmapPipeline_core.h

Index: src/core/SkLinearBitmapPipeline_core.h
diff --git a/src/core/SkLinearBitmapPipeline_core.h b/src/core/SkLinearBitmapPipeline_core.h
index cf120eec656c884986f95ca7b8751926a7e4660d..2c39a38320b18aefc0c217d7154c36c9b3dc1b21 100644
--- a/src/core/SkLinearBitmapPipeline_core.h
+++ b/src/core/SkLinearBitmapPipeline_core.h
@@ -178,15 +178,6 @@
         stage->pointListFew(count, xs, ys);
     }
 }
-
-inline Sk4f check_pixel(Sk4f& pixel) {
-    SkASSERTF(0.0f <= pixel[0] && pixel[0] <= 1.0f, "pixel[0]: %f", pixel[0]);
-    SkASSERTF(0.0f <= pixel[1] && pixel[1] <= 1.0f, "pixel[1]: %f", pixel[1]);
-    SkASSERTF(0.0f <= pixel[2] && pixel[2] <= 1.0f, "pixel[2]: %f", pixel[2]);
-    SkASSERTF(0.0f <= pixel[3] && pixel[3] <= 1.0f, "pixel[3]: %f", pixel[3]);
-    return pixel;
-}
-
 }  // namespace
 
 class SkLinearBitmapPipeline::PointProcessorInterface {
@@ -210,6 +201,26 @@
     // Used for nearest neighbor when scale factor is 1.0. The span can just be repeated with no
     // edge pixel alignment problems. This is for handling a very common case.
     virtual void repeatSpan(Span span, int32_t repeatCount) = 0;
+
+    // The x's and y's are setup in the following order:
+    // +--------+--------+
+    // |        |        |
+    // |  px00  |  px10  |
+    // |    0   |    1   |
+    // +--------+--------+
+    // |        |        |
+    // |  px01  |  px11  |
+    // |    2   |    3   |
+    // +--------+--------+
+    // These pixels coordinates are arranged in the following order in xs and ys:
+    // px00  px10  px01  px11
+    virtual void SK_VECTORCALL bilerpEdge(Sk4s xs, Sk4s ys) = 0;
+
+    // A span represents sample points that have been mapped from destination space to source
+    // space. Each sample point is then expanded to the four bilerp points by add +/- 0.5. The
+    // resulting Y values my be off the tile. When y +/- 0.5 are more than 1 apart because of
+    // tiling, the second Y is used to denote the retiled Y value.
+    virtual void bilerpSpan(Span span, SkScalar y) = 0;
 };
 
 class SkLinearBitmapPipeline::DestinationInterface {
@@ -232,10 +243,10 @@
 public:
     virtual ~PixelAccessorInterface() { }
     virtual void SK_VECTORCALL getFewPixels(
-        int n, Sk4i xs, Sk4i ys, Sk4f* px0, Sk4f* px1, Sk4f* px2) const = 0;
+        int n, Sk4s xs, Sk4s ys, Sk4f* px0, Sk4f* px1, Sk4f* px2) const = 0;
 
     virtual void SK_VECTORCALL get4Pixels(
-        Sk4i xs, Sk4i ys, Sk4f* px0, Sk4f* px1, Sk4f* px2, Sk4f* px3) const = 0;
+        Sk4s xs, Sk4s ys, Sk4f* px0, Sk4f* px1, Sk4f* px2, Sk4f* px3) const = 0;
 
     virtual void get4Pixels(
         const void* src, int index, Sk4f* px0, Sk4f* px1, Sk4f* px2, Sk4f* px3) const = 0;