blob: c85d768e68f4328d8acb94952dcd91afe5be9f74 [file] [log] [blame]
// Copyright 2015 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 "components/favicon_base/fallback_icon_style.h"
#include <algorithm>
#include "ui/gfx/color_analysis.h"
#include "ui/gfx/color_utils.h"
namespace favicon_base {
namespace {
// The maximum lightness of the background color to ensure light text is
// readable.
const double kMaxBackgroundColorLightness = 0.67;
const double kMinBackgroundColorLightness = 0.15;
// Default values for FallbackIconStyle.
const SkColor kDefaultBackgroundColor = SkColorSetRGB(0x78, 0x78, 0x78);
const SkColor kDefaultTextColor = SK_ColorWHITE;
} // namespace
: background_color(kDefaultBackgroundColor),
text_color(kDefaultTextColor) {}
FallbackIconStyle::~FallbackIconStyle() {
bool FallbackIconStyle::operator==(const FallbackIconStyle& other) const {
return background_color == other.background_color &&
is_default_background_color == other.is_default_background_color &&
text_color == other.text_color;
void SetDominantColorAsBackground(
const scoped_refptr<base::RefCountedMemory>& bitmap_data,
FallbackIconStyle* style) {
// Try to ensure color's lightness isn't too large so that light text is
// visible. Set an upper bound for the dominant color.
const color_utils::HSL lower_bound{-1.0, -1.0, kMinBackgroundColorLightness};
const color_utils::HSL upper_bound{-1.0, -1.0, kMaxBackgroundColorLightness};
color_utils::GridSampler sampler;
SkColor dominant_color = color_utils::CalculateKMeanColorOfPNG(
bitmap_data, lower_bound, upper_bound, &sampler);
// |CalculateKMeanColorOfPNG| will try to return a color that lies within the
// specified bounds if one exists in the image. If there's no such color, it
// will return the dominant color which may be lighter than our upper bound.
// Clamp lightness down to a reasonable maximum value so text is readable.
color_utils::HSL color_hsl;
color_utils::SkColorToHSL(dominant_color, &color_hsl);
color_hsl.l = std::min(color_hsl.l, kMaxBackgroundColorLightness);
style->background_color =
color_utils::HSLToSkColor(color_hsl, SK_AlphaOPAQUE);
style->is_default_background_color = false;
} // namespace favicon_base