Revert of experiment: float color components

tests/SkColor4fTest.cpp

-/*
- * 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 "SkColor.h"
-#include "SkShader.h"
-#include "SkColorMatrixFilter.h"
-#include "Test.h"
-#include "SkRandom.h"
-
-DEF_TEST(SkColor4f_FromColor, reporter) {
-    const struct {
-        SkColor     fC;
-        SkColor4f   fC4;
-    } recs[] = {
-        { SK_ColorBLACK, { 1, 0, 0, 0 } },
-        { SK_ColorWHITE, { 1, 1, 1, 1 } },
-        { SK_ColorRED,   { 1, 1, 0, 0 } },
-        { SK_ColorGREEN, { 1, 0, 1, 0 } },
-        { SK_ColorBLUE,  { 1, 0, 0, 1 } },
-        { 0,             { 0, 0, 0, 0 } },
-        { 0x55AAFF00,    { 1/3.0f, 2/3.0f, 1, 0 } },
-    };
-
-    for (const auto& r : recs) {
-        SkColor4f c4 = SkColor4f::FromColor(r.fC);
-        REPORTER_ASSERT(reporter, c4 == r.fC4);
-    }
-}
-
-static bool nearly_equal(float a, float b) {
-    const float kTolerance = 1.0f / (1 << 20);
-    return fabsf(a - b) < kTolerance;
-}
-
-DEF_TEST(SkColor4f_premul, reporter) {
-    SkRandom rand;
-
-    for (int i = 0; i < 1000000; ++i) {
-        // First just test opaque colors, so that the premul should be exact
-        SkColor4f c4 {
-            1, rand.nextUScalar1(), rand.nextUScalar1(), rand.nextUScalar1()
-        };
-        SkPM4f pm4 = c4.premul();
-        REPORTER_ASSERT(reporter, pm4.fVec[SK_A_INDEX] == c4.fA);
-        REPORTER_ASSERT(reporter, pm4.fVec[SK_R_INDEX] == c4.fA * c4.fR);
-        REPORTER_ASSERT(reporter, pm4.fVec[SK_G_INDEX] == c4.fA * c4.fG);
-        REPORTER_ASSERT(reporter, pm4.fVec[SK_B_INDEX] == c4.fA * c4.fB);
-
-        // We compare with a tolerance, in case our premul multiply is implemented at slightly
-        // different precision than the test code.
-        c4.fA = rand.nextUScalar1();
-        pm4 = c4.premul();
-        REPORTER_ASSERT(reporter, pm4.fVec[SK_A_INDEX] == c4.fA);
-        REPORTER_ASSERT(reporter, nearly_equal(pm4.fVec[SK_R_INDEX], c4.fA * c4.fR));
-        REPORTER_ASSERT(reporter, nearly_equal(pm4.fVec[SK_G_INDEX], c4.fA * c4.fG));
-        REPORTER_ASSERT(reporter, nearly_equal(pm4.fVec[SK_B_INDEX], c4.fA * c4.fB));
-    }
-}