Revert of Create SkColorSpaceXform to handle color conversions

src/core/SkColorSpaceXform.cpp

Index: src/core/SkColorSpaceXform.cpp
diff --git a/src/core/SkColorSpaceXform.cpp b/src/core/SkColorSpaceXform.cpp
deleted file mode 100644
index 473e715353f3337b644388b406b3e6a87902d58a..0000000000000000000000000000000000000000
--- a/src/core/SkColorSpaceXform.cpp
+++ /dev/null
@@ -1,109 +0,0 @@
-/*
- * Copyright 2016 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "SkColorPriv.h"
-#include "SkColorSpace_Base.h"
-#include "SkColorSpaceXform.h"
-
-bool compute_gamut_xform(SkMatrix44* srcToDst, const SkMatrix44& srcToXYZ,
-                         const SkMatrix44& dstToXYZ) {
-    if (!dstToXYZ.invert(srcToDst)) {
-        return false;
-    }
-
-    srcToDst->postConcat(srcToXYZ);
-    return true;
-}
-
-std::unique_ptr<SkColorSpaceXform> SkColorSpaceXform::New(const sk_sp<SkColorSpace>& srcSpace,
-                                                          const sk_sp<SkColorSpace>& dstSpace) {
-    if (!srcSpace || !dstSpace) {
-        return nullptr;
-    }
-
-    if (as_CSB(srcSpace)->gammas()->isValues() && as_CSB(dstSpace)->gammas()->isValues()) {
-        SkMatrix44 srcToDst(SkMatrix44::kUninitialized_Constructor);
-        if (!compute_gamut_xform(&srcToDst, srcSpace->xyz(), dstSpace->xyz())) {
-            return nullptr;
-        }
-
-        float srcGammas[3];
-        float dstGammas[3];
-        srcGammas[0] = as_CSB(srcSpace)->gammas()->fRed.fValue;
-        srcGammas[1] = as_CSB(srcSpace)->gammas()->fGreen.fValue;
-        srcGammas[2] = as_CSB(srcSpace)->gammas()->fBlue.fValue;
-        dstGammas[0] = 1.0f / as_CSB(dstSpace)->gammas()->fRed.fValue;
-        dstGammas[1] = 1.0f / as_CSB(dstSpace)->gammas()->fGreen.fValue;
-        dstGammas[2] = 1.0f / as_CSB(dstSpace)->gammas()->fBlue.fValue;
-
-        return std::unique_ptr<SkColorSpaceXform>(
-                new SkGammaByValueXform(srcGammas, srcToDst, dstGammas));
-    }
-
-    // Unimplemeted
-    return nullptr;
-}
-
-///////////////////////////////////////////////////////////////////////////////////////////////////
-
-SkGammaByValueXform::SkGammaByValueXform(float srcGammas[3], const SkMatrix44& srcToDst,
-                                         float dstGammas[3])
-    : fSrcToDst(srcToDst)
-{
-    memcpy(fSrcGammas, srcGammas, 3 * sizeof(float));
-    memcpy(fDstGammas, dstGammas, 3 * sizeof(float));
-}
-
-static uint8_t clamp_float_to_byte(float v) {
-    v = v * 255.0f;
-    if (v > 255.0f) {
-        return 255;
-    } else if (v <= 0.0f) {
-        return 0;
-    } else {
-        return (uint8_t) (v + 0.5f);
-    }
-}
-
-void SkGammaByValueXform::xform_RGBA_8888(uint32_t* dst, const uint32_t* src, uint32_t len) const {
-    while (len-- > 0) {
-        float srcFloats[3];
-        srcFloats[0] = ((*src >>  0) & 0xFF) * (1.0f / 255.0f);
-        srcFloats[1] = ((*src >>  8) & 0xFF) * (1.0f / 255.0f);
-        srcFloats[2] = ((*src >> 16) & 0xFF) * (1.0f / 255.0f);
-
-        // Convert to linear.
-        srcFloats[0] = pow(srcFloats[0], fSrcGammas[0]);
-        srcFloats[1] = pow(srcFloats[1], fSrcGammas[1]);
-        srcFloats[2] = pow(srcFloats[2], fSrcGammas[2]);
-
-        // Convert to dst gamut.
-        float dstFloats[3];
-        dstFloats[0] = srcFloats[0] * fSrcToDst.getFloat(0, 0) +
-                       srcFloats[1] * fSrcToDst.getFloat(1, 0) +
-                       srcFloats[2] * fSrcToDst.getFloat(2, 0) + fSrcToDst.getFloat(3, 0);
-        dstFloats[1] = srcFloats[0] * fSrcToDst.getFloat(0, 1) +
-                       srcFloats[1] * fSrcToDst.getFloat(1, 1) +
-                       srcFloats[2] * fSrcToDst.getFloat(2, 1) + fSrcToDst.getFloat(3, 1);
-        dstFloats[2] = srcFloats[0] * fSrcToDst.getFloat(0, 2) +
-                       srcFloats[1] * fSrcToDst.getFloat(1, 2) +
-                       srcFloats[2] * fSrcToDst.getFloat(2, 2) + fSrcToDst.getFloat(3, 2);
-
-        // Convert to dst gamma.
-        dstFloats[0] = pow(dstFloats[0], fDstGammas[0]);
-        dstFloats[1] = pow(dstFloats[1], fDstGammas[1]);
-        dstFloats[2] = pow(dstFloats[2], fDstGammas[2]);
-
-        *dst = SkPackARGB32NoCheck(((*src >> 24) & 0xFF),
-                                   clamp_float_to_byte(dstFloats[0]),
-                                   clamp_float_to_byte(dstFloats[1]),
-                                   clamp_float_to_byte(dstFloats[2]));
-
-        dst++;
-        src++;
-    }
-}