1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
// 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)) {
return ParseRgbColorString(color_string, result);
}
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;
// Save a memory allocation -- we never need more than 8 chars.
formatted_color.reserve(8);
// 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 || color_string.length() == 5) {
for (size_t i = 1; i < color_string.length(); ++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 if (color_string.length() == 9) {
formatted_color = color_string.substr(1, 8);
} else {
return false;
}
// Add an alpha if one was not set.
if (formatted_color.length() == 6) {
formatted_color += "FF";
}
// 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(color_bytes[3], 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 ParseRgbColorString(const std::string& color_string, SkColor* result) {
// https://www.w3.org/wiki/CSS/Properties/color/RGB#The_format_of_the_RGB_Value
// The CSS3 specification defines the format of a RGB color as
// rgb(<number>, <number>, <number>) or
// rgb(<percent>, <percent>, <percent>) or
// and with alpha, the format is
// rgb(<number>, <number>, <number>, <alphavalue>) or
// rgba(<percent>, <percent>, <percent>, <alphavalue>)
// Whitespace is arbitrary.
// e.g.: rgb(120, 100, 50), rgba(120, 100, 50, 0.5);
int r = 0;
int g = 0;
int b = 0;
// 'rgb()' has '1' alpha value implicitly.
double alpha = 1.0;
// Percentage rgb values are not supported.
if (color_string.find('%') != std::string::npos) {
NOTIMPLEMENTED();
return false;
}
if (!re2::RE2::FullMatch(color_string,
"rgb\\(([\\d]+),\\s*([\\d]+),\\s*([\\d]+)\\)", &r,
&g, &b) &&
!re2::RE2::FullMatch(
color_string,
"rgba\\(([\\d]+),\\s*([\\d]+),\\s*([\\d]+),\\s*([\\d.]+)\\)", &r, &g,
&b, &alpha)) {
return false;
}
if (alpha < 0 || alpha > 1.0 || r < 0 || r > 255 || g < 0 || g > 255 ||
b < 0 || b > 255) {
return false;
}
SkAlpha sk_alpha = alpha * 255;
*result = SkColorSetARGB(sk_alpha, r, g, b);
return true;
}
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
|
