Reverting 14712.

skia/ext/skia_utils.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "skia/ext/skia_utils.h"
-#include "skia/include/SkColorPriv.h"
 
 #include "SkGradientShader.h"
 
 namespace skia {
 
 SkShader* CreateGradientShader(int start_point,
                                int end_point,
                                SkColor start_color,
                                SkColor end_color) {
   SkColor grad_colors[2] = { start_color, end_color};
   SkPoint grad_points[2];
   grad_points[0].set(SkIntToScalar(0), SkIntToScalar(start_point));
   grad_points[1].set(SkIntToScalar(0), SkIntToScalar(end_point));
 
   return SkGradientShader::CreateLinear(
       grad_points, grad_colors, NULL, 2, SkShader::kRepeat_TileMode);
 }
 
-// Helper function for HSLToSKColor.
-static inline double calcHue(double temp1, double temp2, double hueVal) {
-  if (hueVal < 0.0)
-    hueVal++;
-  else if (hueVal > 1.0)
-    hueVal--;
-
-  if (hueVal * 6.0 < 1.0)
-    return temp1 + (temp2 - temp1) * hueVal * 6.0;
-  if (hueVal * 2.0 < 1.0)
-    return temp2;
-  if (hueVal * 3.0 < 2.0)
-    return temp1 + (temp2 - temp1) * (2.0 / 3.0 - hueVal) * 6.0;
-
-  return temp1;
-}
-
-SkPMColor HSLToSKColor(U8CPU alpha, float hsl[3]) {
-  double hue = SkScalarToDouble(hsl[0]);
-  double saturation = SkScalarToDouble(hsl[1]);
-  double lightness = SkScalarToDouble(hsl[2]);
-  double scaleFactor = 256.0;
-
-  // If there's no color, we don't care about hue and can do everything based
-  // on brightness.
-  if (!saturation) {
-    U8CPU lightness;
-
-    if (hsl[2] < 0)
-      lightness = 0;
-    else if (hsl[2] >= SK_Scalar1)
-      lightness = 255;
-    else
-      lightness = SkScalarToFixed(hsl[2]) >> 8;
-
-    unsigned greyValue = SkAlphaMul(lightness, alpha);
-    return SkColorSetARGB(alpha, greyValue, greyValue, greyValue);
-  }
-
-  double temp2 = (lightness < 0.5) ?
-      lightness * (1.0 + saturation) :
-      lightness + saturation - (lightness * saturation);
-  double temp1 = 2.0 * lightness - temp2;
-
-  double rh = calcHue(temp1, temp2, hue + 1.0 / 3.0);
-  double gh = calcHue(temp1, temp2, hue);
-  double bh = calcHue(temp1, temp2, hue - 1.0 / 3.0);
-
-  return SkColorSetARGB(alpha,
-      SkAlphaMul(static_cast<int>(rh * scaleFactor), alpha),
-      SkAlphaMul(static_cast<int>(gh * scaleFactor), alpha),
-      SkAlphaMul(static_cast<int>(bh * scaleFactor), alpha));
-}
-
-void SkColorToHSL(SkPMColor c, float hsl[3]) {
-  double r = SkColorGetR(c) / 255.0;
-  double g = SkColorGetG(c) / 255.0;
-  double b = SkColorGetB(c) / 255.0;
-
-  double h, s, l;
-
-  double vmax = r > g ? r : g;
-  vmax = vmax > b ? vmax : b;
-  double vmin = r < g ? r : g;
-  vmin = vmin < b ? vmin : b;
-  double delta = vmax - vmin;
-
-  l = (vmax + vmin) / 2;
-
-  if (delta == 0) {
-    h = 0;
-    s = 0;
-  } else {
-    if (l < 0.5)
-      s = delta / (vmax + vmin);
-    else
-      s = delta / (2 - vmax - vmin);
-
-    double dr = (((vmax - r) / 6.0) + (delta / 2.0)) / delta;
-    double dg = (((vmax - g) / 6.0) + (delta / 2.0)) / delta;
-    double db = (((vmax - b) / 6.0) + (delta / 2.0)) / delta;
-
-    if (r == vmax)
-      h = db - dg;
-    else if (g == vmax)
-      h = (1.0 / 3.0) + dr - db;
-    else if (b == vmax)
-      h = (2.0 / 3.0) + dg - dr;
-
-    if (h < 0) h += 1;
-    if (h > 1) h -= 1;
-  }
-
-  hsl[0] = h;
-  hsl[1] = s;
-  hsl[2] = l;
-}
-
-
 }  // namespace skia