Remove unused (by clients) SkUnitMapper (https://codereview.chromium.org/283273002/)

src/utils/SkUnitMappers.cpp

-
-/*
- * Copyright 2011 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-#include "SkUnitMappers.h"
-#include "SkReadBuffer.h"
-#include "SkWriteBuffer.h"
-
-
-SkDiscreteMapper::SkDiscreteMapper(int segments) {
-    if (segments < 2) {
-        fSegments = 0;
-        fScale = 0;
-    } else {
-        if (segments > 0xFFFF) {
-            segments = 0xFFFF;
-        }
-        fSegments = segments;
-        fScale = (1 << 30) / (segments - 1);
-    }
-}
-
-uint16_t SkDiscreteMapper::mapUnit16(uint16_t input) {
-    SkFixed x = input * fSegments >> 16;
-    x = x * fScale >> 14;
-    x += x << 15 >> 31; // map 0x10000 to 0xFFFF
-    return SkToU16(x);
-}
-
-SkDiscreteMapper::SkDiscreteMapper(SkReadBuffer& rb)
-        : SkUnitMapper(rb) {
-    fSegments = rb.readInt();
-    fScale = rb.read32();
-}
-
-void SkDiscreteMapper::flatten(SkWriteBuffer& wb) const {
-    this->INHERITED::flatten(wb);
-
-    wb.writeInt(fSegments);
-    wb.write32(fScale);
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
-uint16_t SkCosineMapper::mapUnit16(uint16_t input)
-{
-    /*  we want to call cosine(input * pi/2) treating input as [0...1)
-        however, the straight multitply would overflow 32bits since input is
-        16bits and pi/2 is 17bits, so we shift down our pi const before we mul
-    */
-    SkFixed rads = (unsigned)(input * (SK_FixedPI >> 2)) >> 15;
-    SkFixed x = SkFixedCos(rads);
-    x += x << 15 >> 31; // map 0x10000 to 0xFFFF
-    return SkToU16(x);
-}
-
-SkCosineMapper::SkCosineMapper(SkReadBuffer& rb)
-    : SkUnitMapper(rb) {}