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// Copyright 2014 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 "extensions/common/image_util.h"
#include <stddef.h>
#include <stdint.h>
#include <vector>
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "third_party/re2/src/re2/re2.h"
#include "third_party/skia/include/core/SkColor.h"
#include "third_party/skia/include/utils/SkParse.h"
#include "ui/gfx/color_utils.h"
namespace extensions {
namespace image_util {
bool ParseCssColorString(const std::string& color_string, SkColor* result) {
if (color_string.empty())
return false;
if (color_string[0] == '#')
return ParseHexColorString(color_string, result);
if (base::StartsWith(color_string, "hsl", base::CompareCase::SENSITIVE))
return ParseHslColorString(color_string, result);
if (base::StartsWith(color_string, "rgb", base::CompareCase::SENSITIVE)) {
NOTIMPLEMENTED();
return false;
}
if (SkParse::FindNamedColor(color_string.c_str(), color_string.size(),
result) != nullptr) {
return true;
}
return false;
}
bool ParseHexColorString(const std::string& color_string, SkColor* result) {
std::string formatted_color;
// Check the string for incorrect formatting.
if (color_string.empty() || color_string[0] != '#')
return false;
// Convert the string from #FFF format to #FFFFFF format.
if (color_string.length() == 4) {
for (size_t i = 1; i < 4; ++i) {
formatted_color += color_string[i];
formatted_color += color_string[i];
}
} else if (color_string.length() == 7) {
formatted_color = color_string.substr(1, 6);
} else {
return false;
}
// Convert the string to an integer and make sure it is in the correct value
// range.
std::vector<uint8_t> color_bytes;
if (!base::HexStringToBytes(formatted_color, &color_bytes))
return false;
*result = SkColorSetARGB(255, color_bytes[0], color_bytes[1], color_bytes[2]);
return true;
}
std::string GenerateHexColorString(SkColor color) {
return base::StringPrintf("#%02X%02X%02X", SkColorGetR(color),
SkColorGetG(color), SkColorGetB(color));
}
bool ParseHslColorString(const std::string& color_string, SkColor* result) {
// http://www.w3.org/wiki/CSS/Properties/color/HSL#The_format_of_the_HSL_Value
// The CSS3 specification defines the format of a HSL color as
// hsl(<number>, <percent>, <percent>)
// and with alpha, the format is
// hsla(<number>, <percent>, <percent>, <number>)
// e.g.: hsl(120, 100%, 50%), hsla(120, 100%, 50%, 0.5);
double hue = 0.0;
double saturation = 0.0;
double lightness = 0.0;
// 'hsl()' has '1' alpha value implicitly.
double alpha = 1.0;
if (!re2::RE2::FullMatch(color_string,
"hsl\\((-?[\\d.]+),\\s*([\\d.]+)%,\\s*([\\d.]+)%\\)",
&hue, &saturation, &lightness) &&
!re2::RE2::FullMatch(
color_string,
"hsla\\((-?[\\d.]+),\\s*([\\d.]+)%,\\s*([\\d.]+)%,\\s*([\\d.]+)\\)",
&hue, &saturation, &lightness, &alpha)) {
return false;
}
color_utils::HSL hsl;
// Normalize the value between 0.0 and 1.0.
hsl.h = (((static_cast<int>(hue) % 360) + 360) % 360) / 360.0;
hsl.s = std::max(0.0, std::min(100.0, saturation)) / 100.0;
hsl.l = std::max(0.0, std::min(100.0, lightness)) / 100.0;
SkAlpha sk_alpha = std::max(0.0, std::min(1.0, alpha)) * 255;
*result = color_utils::HSLToSkColor(hsl, sk_alpha);
return true;
}
} // namespace image_util
} // namespace extensions
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