Revert of SkPx: new approach to fixed-point SIMD

src/core/SkPx.h

Index: src/core/SkPx.h
diff --git a/src/core/SkPx.h b/src/core/SkPx.h
deleted file mode 100644
index a4b1978e63ef9ec3732e0d7bbecd155bfe9ae5bb..0000000000000000000000000000000000000000
--- a/src/core/SkPx.h
+++ /dev/null
@@ -1,89 +0,0 @@
-/*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef SkPx_DEFINED
-#define SkPx_DEFINED
-
-#include "SkTypes.h"
-#include "SkColorPriv.h"
-
-// We'll include one of src/opts/SkPx_{sse,neon,none}.h to define a type SkPx.
-//
-// SkPx represents up to SkPx::N 8888 pixels.  It's agnostic to whether these
-// are SkColors or SkPMColors; it only assumes that alpha is the high byte.
-static_assert(SK_A32_SHIFT == 24, "For both SkColor and SkPMColor, alpha is always the high byte.");
-//
-// SkPx::Alpha represents up to SkPx::N 8-bit values, usually coverage or alpha.
-// SkPx::Wide represents up to SkPx::N pixels with 16 bits per component.
-//
-// SkPx supports the following methods:
-//    static SkPx Dup(uint32_t);
-//    static SkPx LoadN(const uint32_t*);
-//    static SkPx Load(int n, const uint32_t*);  // where 0<n<SkPx::N
-//    void storeN(uint32_t*) const;
-//    void store(int n, uint32_t*) const;        // where 0<n<SkPx::N
-//
-//    Alpha alpha() const;    // argb -> a
-//    Wide widenLo() const;   // argb -> 0a0r0g0b
-//    Wide widenHi() const;   // argb -> a0r0g0b0
-//    Wide widenLoHi() const; // argb -> aarrggbb
-//
-//    SkPx    operator+(const SkPx&) const;
-//    SkPx    operator-(const SkPx&) const;
-//    SkPx saturatedAdd(const SkPx&) const;
-//
-//    Wide operator*(const Alpha&) const;  // argb * A -> (a*A)(r*A)(g*A)(b*A)
-//
-//    // Fast approximate (px*a+127)/255.
-//    // Never off by more than 1, and always correct when px or a is 0 or 255.
-//    // We use the approximation (px*a+px)/256.
-//    SkPx approxMulDiv255(const Alpha&) const;
-//
-//    SkPx addAlpha(const Alpha&) const;  // argb + A -> (a+A)rgb
-//
-// SkPx::Alpha supports the following methods:
-//    static Alpha Dup(uint8_t);
-//    static Alpha LoadN(const uint8_t*);
-//    static Alpha Load(int n, const uint8_t*);  // where 0<n<SkPx::N
-//
-//    Alpha inv() const;  // a -> 255-a
-//
-// SkPx::Wide supports the following methods:
-//    Wide operator+(const Wide&);
-//    Wide operator-(const Wide&);
-//    Wide operator<<(int bits);
-//    Wide operator>>(int bits);
-//
-//    // Return the high byte of each component of (*this + o.widenLo()).
-//    SkPx addNarrowHi(const SkPx& o);
-//
-// Methods left unwritten, but certainly to come:
-//    SkPx SkPx::operator<(const SkPx&) const;
-//    SkPx SkPx::thenElse(const SkPx& then, const SkPx& else) const;
-//    Wide Wide::operator<(const Wide&) const;
-//    Wide Wide::thenElse(const Wide& then, const Wide& else) const;
-//
-//    SkPx Wide::div255() const;  // Rounds, think (*this + 127) / 255.
-//
-//  The different implementations of SkPx have complete freedom to choose
-//  SkPx::N and how they represent SkPx, SkPx::Alpha, and SkPx::Wide.
-//
-//  All observable math must remain identical.
-
-#if defined(SKNX_NO_SIMD)
-    #include "../opts/SkPx_none.h"
-#else
-    #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2
-        #include "../opts/SkPx_sse.h"
-    #elif defined(SK_ARM_HAS_NEON)
-        #include "../opts/SkPx_neon.h"
-    #else
-        #include "../opts/SkPx_none.h"
-    #endif
-#endif
-
-#endif//SkPx_DEFINED