Move src/gfx/ to src/ui/gfx...

gfx/color_utils.cc

Index: gfx/color_utils.cc
===================================================================
--- gfx/color_utils.cc	(revision 73319)
+++ gfx/color_utils.cc	(working copy)
@@ -1,300 +0,0 @@
-// Copyright (c) 2010 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 "gfx/color_utils.h"
-
-#include <math.h>
-#if defined(OS_WIN)
-#include <windows.h>
-#endif
-
-#include <algorithm>
-
-#include "base/basictypes.h"
-#include "base/logging.h"
-#include "build/build_config.h"
-#if defined(OS_WIN)
-#include "skia/ext/skia_utils_win.h"
-#endif
-#include "third_party/skia/include/core/SkBitmap.h"
-
-namespace color_utils {
-
-// Helper functions -----------------------------------------------------------
-
-namespace {
-
-double calcHue(double temp1, double temp2, double hue) {
-  if (hue < 0.0)
-    ++hue;
-  else if (hue > 1.0)
-    --hue;
-
-  if (hue * 6.0 < 1.0)
-    return temp1 + (temp2 - temp1) * hue * 6.0;
-  if (hue * 2.0 < 1.0)
-    return temp2;
-  if (hue * 3.0 < 2.0)
-    return temp1 + (temp2 - temp1) * (2.0 / 3.0 - hue) * 6.0;
-
-  return temp1;
-}
-
-int GetLumaForColor(SkColor* color) {
-  int luma = static_cast<int>((0.3 * SkColorGetR(*color)) +
-                              (0.59 * SkColorGetG(*color)) +
-                              (0.11 * SkColorGetB(*color)));
-  return std::max(std::min(luma, 255), 0);
-}
-
-// Next two functions' formulas from:
-// http://www.w3.org/TR/WCAG20/#relativeluminancedef
-// http://www.w3.org/TR/WCAG20/#contrast-ratiodef
-
-double ConvertSRGB(double eight_bit_component) {
-  const double component = eight_bit_component / 255.0;
-  return (component <= 0.03928) ?
-      (component / 12.92) : pow((component + 0.055) / 1.055, 2.4);
-}
-
-SkColor LumaInvertColor(const SkColor& color) {
-  HSL hsl;
-  SkColorToHSL(color, &hsl);
-  hsl.l = 1.0 - hsl.l;
-  return HSLToSkColor(hsl, 255);
-}
-
-double ContrastRatio(double foreground_luminance, double background_luminance) {
-  // NOTE: Only pass in numbers obtained from RelativeLuminance(), since those
-  // are guaranteed to be > 0 and thus not cause a divide-by-zero error here.
-  return (foreground_luminance > background_luminance) ?
-      (foreground_luminance / background_luminance) :
-      (background_luminance / foreground_luminance);
-}
-
-}  // namespace
-
-// ----------------------------------------------------------------------------
-
-double RelativeLuminance(SkColor color) {
-  return (0.2126 * ConvertSRGB(SkColorGetR(color))) +
-      (0.7152 * ConvertSRGB(SkColorGetG(color))) +
-      (0.0722 * ConvertSRGB(SkColorGetB(color))) + 0.05;
-}
-
-void SkColorToHSL(SkColor c, HSL* hsl) {
-  double r = static_cast<double>(SkColorGetR(c)) / 255.0;
-  double g = static_cast<double>(SkColorGetG(c)) / 255.0;
-  double b = static_cast<double>(SkColorGetB(c)) / 255.0;
-  double vmax = std::max(std::max(r, g), b);
-  double vmin = std::min(std::min(r, g), b);
-  double delta = vmax - vmin;
-  hsl->l = (vmax + vmin) / 2;
-  if (delta) {
-    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;
-    // We need to compare for the max value because comparing vmax to r,
-    // g or b can sometimes result in values overflowing registers.
-    if (r >= g && r >= b)
-      hsl->h = db - dg;
-    else if (g >= r && g >= b)
-      hsl->h = (1.0 / 3.0) + dr - db;
-    else  // (b >= r && b >= g)
-      hsl->h = (2.0 / 3.0) + dg - dr;
-
-    if (hsl->h < 0.0)
-      ++hsl->h;
-    else if (hsl->h > 1.0)
-      --hsl->h;
-
-    hsl->s = delta / ((hsl->l < 0.5) ? (vmax + vmin) : (2 - vmax - vmin));
-  } else {
-    hsl->h = hsl->s = 0;
-  }
-}
-
-SkColor HSLToSkColor(const HSL& hsl, SkAlpha alpha) {
-  double hue = hsl.h;
-  double saturation = hsl.s;
-  double lightness = hsl.l;
-
-  // If there's no color, we don't care about hue and can do everything based
-  // on brightness.
-  if (!saturation) {
-    uint8 light;
-
-    if (lightness < 0)
-      light = 0;
-    else if (lightness >= 1.0)
-      light = 255;
-    else
-      light = SkDoubleToFixed(lightness) >> 8;
-
-    return SkColorSetARGB(alpha, light, light, light);
-  }
-
-  double temp2 = (lightness < 0.5) ?
-      (lightness * (1.0 + saturation)) :
-      (lightness + saturation - (lightness * saturation));
-  double temp1 = 2.0 * lightness - temp2;
-  return SkColorSetARGB(alpha,
-      static_cast<int>(calcHue(temp1, temp2, hue + 1.0 / 3.0) * 255),
-      static_cast<int>(calcHue(temp1, temp2, hue) * 255),
-      static_cast<int>(calcHue(temp1, temp2, hue - 1.0 / 3.0) * 255));
-}
-
-SkColor HSLShift(SkColor color, const HSL& shift) {
-  HSL hsl;
-  int alpha = SkColorGetA(color);
-  SkColorToHSL(color, &hsl);
-
-  // Replace the hue with the tint's hue.
-  if (shift.h >= 0)
-    hsl.h = shift.h;
-
-  // Change the saturation.
-  if (shift.s >= 0) {
-    if (shift.s <= 0.5)
-      hsl.s *= shift.s * 2.0;
-    else
-      hsl.s += (1.0 - hsl.s) * ((shift.s - 0.5) * 2.0);
-  }
-
-  SkColor result = HSLToSkColor(hsl, alpha);
-
-  if (shift.l < 0)
-    return result;
-
-  // Lightness shifts in the style of popular image editors aren't
-  // actually represented in HSL - the L value does have some effect
-  // on saturation.
-  double r = static_cast<double>(SkColorGetR(result));
-  double g = static_cast<double>(SkColorGetG(result));
-  double b = static_cast<double>(SkColorGetB(result));
-  if (shift.l <= 0.5) {
-    r *= (shift.l * 2.0);
-    g *= (shift.l * 2.0);
-    b *= (shift.l * 2.0);
-  } else {
-    r += (255.0 - r) * ((shift.l - 0.5) * 2.0);
-    g += (255.0 - g) * ((shift.l - 0.5) * 2.0);
-    b += (255.0 - b) * ((shift.l - 0.5) * 2.0);
-  }
-  return SkColorSetARGB(alpha,
-                        static_cast<int>(r),
-                        static_cast<int>(g),
-                        static_cast<int>(b));
-}
-
-bool IsColorCloseToTransparent(SkAlpha alpha) {
-  const int kCloseToBoundary = 64;
-  return alpha < kCloseToBoundary;
-}
-
-bool IsColorCloseToGrey(int r, int g, int b) {
-  const int kAverageBoundary = 15;
-  int average = (r + g + b) / 3;
-  return (abs(r - average) < kAverageBoundary) &&
-         (abs(g - average) < kAverageBoundary) &&
-         (abs(b - average) < kAverageBoundary);
-}
-
-SkColor GetAverageColorOfFavicon(SkBitmap* favicon, SkAlpha alpha) {
-  int r = 0, g = 0, b = 0;
-
-  SkAutoLockPixels favicon_lock(*favicon);
-  SkColor* pixels = static_cast<SkColor*>(favicon->getPixels());
-  // Assume ARGB_8888 format.
-  DCHECK(favicon->getConfig() == SkBitmap::kARGB_8888_Config);
-  SkColor* current_color = pixels;
-
-  DCHECK(favicon->width() <= 16 && favicon->height() <= 16);
-
-  int pixel_count = favicon->width() * favicon->height();
-  int color_count = 0;
-  for (int i = 0; i < pixel_count; ++i, ++current_color) {
-    // Disregard this color if it is close to black, close to white, or close
-    // to transparent since any of those pixels do not contribute much to the
-    // color makeup of this icon.
-    int cr = SkColorGetR(*current_color);
-    int cg = SkColorGetG(*current_color);
-    int cb = SkColorGetB(*current_color);
-
-    if (IsColorCloseToTransparent(SkColorGetA(*current_color)) ||
-        IsColorCloseToGrey(cr, cg, cb))
-      continue;
-
-    r += cr;
-    g += cg;
-    b += cb;
-    ++color_count;
-  }
-
-  return color_count ?
-      SkColorSetARGB(alpha, r / color_count, g / color_count, b / color_count) :
-      SkColorSetARGB(alpha, 0, 0, 0);
-}
-
-void BuildLumaHistogram(SkBitmap* bitmap, int histogram[256]) {
-  SkAutoLockPixels bitmap_lock(*bitmap);
-  // Assume ARGB_8888 format.
-  DCHECK(bitmap->getConfig() == SkBitmap::kARGB_8888_Config);
-
-  int pixel_width = bitmap->width();
-  int pixel_height = bitmap->height();
-  for (int y = 0; y < pixel_height; ++y) {
-    SkColor* current_color = static_cast<uint32_t*>(bitmap->getAddr32(0, y));
-    for (int x = 0; x < pixel_width; ++x, ++current_color)
-      histogram[GetLumaForColor(current_color)]++;
-  }
-}
-
-SkColor AlphaBlend(SkColor foreground, SkColor background, SkAlpha alpha) {
-  if (alpha == 0)
-    return background;
-  if (alpha == 255)
-    return foreground;
-
-  int f_alpha = SkColorGetA(foreground);
-  int b_alpha = SkColorGetA(background);
-
-  double normalizer = (f_alpha * alpha + b_alpha * (255 - alpha)) / 255.0;
-  if (normalizer == 0.0)
-    return SkColorSetARGB(0, 0, 0, 0);
-
-  double f_weight = f_alpha * alpha / normalizer;
-  double b_weight = b_alpha * (255 - alpha) / normalizer;
-
-  double r = (SkColorGetR(foreground) * f_weight +
-              SkColorGetR(background) * b_weight) / 255.0;
-  double g = (SkColorGetG(foreground) * f_weight +
-              SkColorGetG(background) * b_weight) / 255.0;
-  double b = (SkColorGetB(foreground) * f_weight +
-              SkColorGetB(background) * b_weight) / 255.0;
-
-  return SkColorSetARGB(static_cast<int>(normalizer),
-                        static_cast<int>(r),
-                        static_cast<int>(g),
-                        static_cast<int>(b));
-}
-
-SkColor GetReadableColor(SkColor foreground, SkColor background) {
-  const SkColor foreground2 = LumaInvertColor(foreground);
-  const double background_luminance = RelativeLuminance(background);
-  return (ContrastRatio(RelativeLuminance(foreground), background_luminance) >=
-          ContrastRatio(RelativeLuminance(foreground2), background_luminance)) ?
-      foreground : foreground2;
-}
-
-SkColor GetSysSkColor(int which) {
-#if defined(OS_WIN)
-  return skia::COLORREFToSkColor(GetSysColor(which));
-#else
-  NOTIMPLEMENTED();
-  return SK_ColorLTGRAY;
-#endif
-}
-
-}  // namespace color_utils