break out the tile and matrix strategies

src/core/SkLinearBitmapPipeline_matrix.h

Index: src/core/SkLinearBitmapPipeline_matrix.h
diff --git a/src/core/SkLinearBitmapPipeline_matrix.h b/src/core/SkLinearBitmapPipeline_matrix.h
new file mode 100644
index 0000000000000000000000000000000000000000..b1bd81f1630f655a2a0dd8e208c3f3bf11651288
--- /dev/null
+++ b/src/core/SkLinearBitmapPipeline_matrix.h
@@ -0,0 +1,90 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkLinearBitmapPipeline_matrix_DEFINED
+#define SkLinearBitmapPipeline_matrix_DEFINED
+
+#include "SkLinearBitmapPipeline_core.h"
+
+namespace {
+class TranslateMatrixStrategy {
+public:
+    TranslateMatrixStrategy(SkVector offset)
+        : fXOffset{X(offset)}
+        , fYOffset{Y(offset)} { }
+
+    void processPoints(Sk4s* xs, Sk4s* ys) {
+        *xs = *xs + fXOffset;
+        *ys = *ys + fYOffset;
+    }
+
+    template <typename Next>
+    bool maybeProcessSpan(Span span, Next* next) {
+        SkPoint start; SkScalar length; int count;
+        std::tie(start, length, count) = span;
+        next->pointSpan(Span{start + SkPoint{fXOffset[0], fYOffset[0]}, length, count});
+        return true;
+    }
+
+private:
+    const Sk4s fXOffset, fYOffset;
+};
+
+class ScaleMatrixStrategy {
+public:
+    ScaleMatrixStrategy(SkVector offset, SkVector scale)
+        : fXOffset{X(offset)}, fYOffset{Y(offset)}
+        ,  fXScale{X(scale)},   fYScale{Y(scale)} { }
+    void processPoints(Sk4s* xs, Sk4s* ys) {
+        *xs = *xs * fXScale + fXOffset;
+        *ys = *ys * fYScale + fYOffset;
+    }
+
+    template <typename Next>
+    bool maybeProcessSpan(Span span, Next* next) {
+        SkPoint start; SkScalar length; int count;
+        std::tie(start, length, count) = span;
+        SkPoint newStart =
+            SkPoint{X(start) * fXScale[0] + fXOffset[0], Y(start) * fYScale[0] + fYOffset[0]};
+        SkScalar newLength = length * fXScale[0];
+        next->pointSpan(Span{newStart, newLength, count});
+        return true;
+    }
+
+private:
+    const Sk4s fXOffset, fYOffset;
+    const Sk4s fXScale, fYScale;
+};
+
+class AffineMatrixStrategy {
+public:
+    AffineMatrixStrategy(SkVector offset, SkVector scale, SkVector skew)
+        : fXOffset{X(offset)}, fYOffset{Y(offset)}
+        , fXScale{X(scale)},   fYScale{Y(scale)}
+        , fXSkew{X(skew)},     fYSkew{Y(skew)} { }
+    void processPoints(Sk4s* xs, Sk4s* ys) {
+        Sk4s newXs = fXScale * *xs +  fXSkew * *ys + fXOffset;
+        Sk4s newYs =  fYSkew * *xs + fYScale * *ys + fYOffset;
+
+        *xs = newXs;
+        *ys = newYs;
+    }
+
+    template <typename Next>
+    bool maybeProcessSpan(Span span, Next* next) {
+        return false;
+    }
+
+private:
+    const Sk4s fXOffset, fYOffset;
+    const Sk4s fXScale,  fYScale;
+    const Sk4s fXSkew,   fYSkew;
+};
+
+}  // namespace
+
+#endif  // SkLinearBitmapPipeline_matrix_DEFINED