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// 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 {
// Luminance threshold for background color determine whether to use dark or
// light text color.
const int kDarkTextLuminanceThreshold = 190;
// The maximum luminance of the background color to ensure light text is
// readable.
const double kMaxBackgroundColorLuminance = 0.67;
// Default values for FallbackIconStyle.
const SkColor kDefaultBackgroundColor = SkColorSetRGB(0x78, 0x78, 0x78);
const SkColor kDefaultTextColorDark = SK_ColorBLACK;
const SkColor kDefaultTextColorLight = SK_ColorWHITE;
const double kDefaultFontSizeRatio = 0.44;
const double kDefaultRoundness = 0; // Square. Round corners are applied
// externally (Javascript or Java).
} // namespace
FallbackIconStyle::FallbackIconStyle()
: background_color(kDefaultBackgroundColor),
text_color(kDefaultTextColorLight),
font_size_ratio(kDefaultFontSizeRatio),
roundness(kDefaultRoundness) {
}
FallbackIconStyle::~FallbackIconStyle() {
}
bool FallbackIconStyle::operator==(const FallbackIconStyle& other) const {
return background_color == other.background_color &&
text_color == other.text_color &&
font_size_ratio == other.font_size_ratio &&
roundness == other.roundness;
}
void MatchFallbackIconTextColorAgainstBackgroundColor(
FallbackIconStyle* style) {
int luminance = color_utils::GetLuminanceForColor(style->background_color);
style->text_color = (luminance >= kDarkTextLuminanceThreshold ?
kDefaultTextColorDark : kDefaultTextColorLight);
}
bool ValidateFallbackIconStyle(const FallbackIconStyle& style) {
return style.font_size_ratio >= 0.0 && style.font_size_ratio <= 1.0 &&
style.roundness >= 0.0 && style.roundness <= 1.0;
}
void SetDominantColorAsBackground(
const scoped_refptr<base::RefCountedMemory>& bitmap_data,
FallbackIconStyle* style) {
SkColor dominant_color =
color_utils::CalculateKMeanColorOfPNG(bitmap_data);
// Assumes |style.text_color| is light, and clamps luminance 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, kMaxBackgroundColorLuminance);
style->background_color =
color_utils::HSLToSkColor(color_hsl, SK_AlphaOPAQUE);
}
} // namespace favicon_base
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