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serenity/Libraries/LibGfx/Color.cpp

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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/Assertions.h>
#include <AK/Optional.h>
#include <AK/String.h>
#include <AK/Vector.h>
#include <LibGfx/Color.h>
#include <LibGfx/SystemTheme.h>
#include <LibIPC/Decoder.h>
#include <LibIPC/Encoder.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
namespace Gfx {
Color::Color(NamedColor named)
{
if (named == Transparent) {
m_value = 0;
return;
}
struct {
u8 r;
u8 g;
u8 b;
} rgb;
switch (named) {
case Black:
rgb = { 0, 0, 0 };
break;
case White:
rgb = { 255, 255, 255 };
break;
case Red:
rgb = { 255, 0, 0 };
break;
case Green:
rgb = { 0, 255, 0 };
break;
case Cyan:
rgb = { 0, 255, 255 };
break;
case DarkCyan:
rgb = { 0, 127, 127 };
break;
case MidCyan:
rgb = { 0, 192, 192 };
break;
case Blue:
rgb = { 0, 0, 255 };
break;
case Yellow:
rgb = { 255, 255, 0 };
break;
case Magenta:
rgb = { 255, 0, 255 };
break;
case DarkGray:
rgb = { 64, 64, 64 };
break;
case MidGray:
rgb = { 127, 127, 127 };
break;
case LightGray:
rgb = { 192, 192, 192 };
break;
case MidGreen:
rgb = { 0, 192, 0 };
break;
case MidBlue:
rgb = { 0, 0, 192 };
break;
case MidRed:
rgb = { 192, 0, 0 };
break;
case MidMagenta:
rgb = { 192, 0, 192 };
break;
case DarkGreen:
rgb = { 0, 128, 0 };
break;
case DarkBlue:
rgb = { 0, 0, 128 };
break;
case DarkRed:
rgb = { 128, 0, 0 };
break;
case WarmGray:
rgb = { 212, 208, 200 };
break;
default:
ASSERT_NOT_REACHED();
break;
}
m_value = 0xff000000 | (rgb.r << 16) | (rgb.g << 8) | rgb.b;
}
String Color::to_string() const
{
return String::format("#%02x%02x%02x%02x", red(), green(), blue(), alpha());
}
String Color::to_string_without_alpha() const
{
return String::format("#%02x%02x%02x", red(), green(), blue());
}
static Optional<Color> parse_rgb_color(const StringView& string)
{
ASSERT(string.starts_with("rgb("));
ASSERT(string.ends_with(")"));
auto substring = string.substring_view(4, string.length() - 5);
auto parts = substring.split_view(',');
if (parts.size() != 3)
return {};
auto r = parts[0].to_uint().value_or(256);
auto g = parts[1].to_uint().value_or(256);
auto b = parts[2].to_uint().value_or(256);
if (r > 255 || g > 255 || b > 255)
return {};
return Color(r, g, b);
}
static Optional<Color> parse_rgba_color(const StringView& string)
{
ASSERT(string.starts_with("rgba("));
ASSERT(string.ends_with(")"));
auto substring = string.substring_view(5, string.length() - 6);
auto parts = substring.split_view(',');
if (parts.size() != 4)
return {};
auto r = parts[0].to_int().value_or(256);
auto g = parts[1].to_int().value_or(256);
auto b = parts[2].to_int().value_or(256);
double alpha = strtod(parts[3].to_string().characters(), nullptr);
unsigned a = alpha * 255;
if (r > 255 || g > 255 || b > 255 || a > 255)
return {};
return Color(r, g, b, a);
}
Optional<Color> Color::from_string(const StringView& string)
{
if (string.is_empty())
return {};
struct ColorAndWebName {
constexpr ColorAndWebName(RGBA32 c, const char* n)
: color(c)
, name(n)
{
}
RGBA32 color;
StringView name;
};
constexpr ColorAndWebName web_colors[] = {
// CSS Level 1
{ 0x000000, "black" },
{ 0xc0c0c0, "silver" },
{ 0x808080, "gray" },
{ 0xffffff, "white" },
{ 0x800000, "maroon" },
{ 0xff0000, "red" },
{ 0x800080, "purple" },
{ 0xff00ff, "fuchsia" },
{ 0x008000, "green" },
{ 0x00ff00, "lime" },
{ 0x808000, "olive" },
{ 0xffff00, "yellow" },
{ 0x000080, "navy" },
{ 0x0000ff, "blue" },
{ 0x008080, "teal" },
{ 0x00ffff, "aqua" },
// CSS Level 2 (Revision 1)
{ 0xffa500, "orange" },
// CSS Color Module Level 3
{ 0xf0f8ff, "aliceblue" },
{ 0xfaebd7, "antiquewhite" },
{ 0x7fffd4, "aquamarine" },
{ 0xf0ffff, "azure" },
{ 0xf5f5dc, "beige" },
{ 0xffe4c4, "bisque" },
{ 0xffebcd, "blanchedalmond" },
{ 0x8a2be2, "blueviolet" },
{ 0xa52a2a, "brown" },
{ 0xdeb887, "burlywood" },
{ 0x5f9ea0, "cadetblue" },
{ 0x7fff00, "chartreuse" },
{ 0xd2691e, "chocolate" },
{ 0xff7f50, "coral" },
{ 0x6495ed, "cornflowerblue" },
{ 0xfff8dc, "cornsilk" },
{ 0xdc143c, "crimson" },
{ 0x00ffff, "cyan" },
{ 0x00008b, "darkblue" },
{ 0x008b8b, "darkcyan" },
{ 0xb8860b, "darkgoldenrod" },
{ 0xa9a9a9, "darkgray" },
{ 0x006400, "darkgreen" },
{ 0xa9a9a9, "darkgrey" },
{ 0xbdb76b, "darkkhaki" },
{ 0x8b008b, "darkmagenta" },
{ 0x556b2f, "darkolivegreen" },
{ 0xff8c00, "darkorange" },
{ 0x9932cc, "darkorchid" },
{ 0x8b0000, "darkred" },
{ 0xe9967a, "darksalmon" },
{ 0x8fbc8f, "darkseagreen" },
{ 0x483d8b, "darkslateblue" },
{ 0x2f4f4f, "darkslategray" },
{ 0x2f4f4f, "darkslategrey" },
{ 0x00ced1, "darkturquoise" },
{ 0x9400d3, "darkviolet" },
{ 0xff1493, "deeppink" },
{ 0x00bfff, "deepskyblue" },
{ 0x696969, "dimgray" },
{ 0x696969, "dimgrey" },
{ 0x1e90ff, "dodgerblue" },
{ 0xb22222, "firebrick" },
{ 0xfffaf0, "floralwhite" },
{ 0x228b22, "forestgreen" },
{ 0xdcdcdc, "gainsboro" },
{ 0xf8f8ff, "ghostwhite" },
{ 0xffd700, "gold" },
{ 0xdaa520, "goldenrod" },
{ 0xadff2f, "greenyellow" },
{ 0x808080, "grey" },
{ 0xf0fff0, "honeydew" },
{ 0xff69b4, "hotpink" },
{ 0xcd5c5c, "indianred" },
{ 0x4b0082, "indigo" },
{ 0xfffff0, "ivory" },
{ 0xf0e68c, "khaki" },
{ 0xe6e6fa, "lavender" },
{ 0xfff0f5, "lavenderblush" },
{ 0x7cfc00, "lawngreen" },
{ 0xfffacd, "lemonchiffon" },
{ 0xadd8e6, "lightblue" },
{ 0xf08080, "lightcoral" },
{ 0xe0ffff, "lightcyan" },
{ 0xfafad2, "lightgoldenrodyellow" },
{ 0xd3d3d3, "lightgray" },
{ 0x90ee90, "lightgreen" },
{ 0xd3d3d3, "lightgrey" },
{ 0xffb6c1, "lightpink" },
{ 0xffa07a, "lightsalmon" },
{ 0x20b2aa, "lightseagreen" },
{ 0x87cefa, "lightskyblue" },
{ 0x778899, "lightslategray" },
{ 0x778899, "lightslategrey" },
{ 0xb0c4de, "lightsteelblue" },
{ 0xffffe0, "lightyellow" },
{ 0x32cd32, "limegreen" },
{ 0xfaf0e6, "linen" },
{ 0xff00ff, "magenta" },
{ 0x66cdaa, "mediumaquamarine" },
{ 0x0000cd, "mediumblue" },
{ 0xba55d3, "mediumorchid" },
{ 0x9370db, "mediumpurple" },
{ 0x3cb371, "mediumseagreen" },
{ 0x7b68ee, "mediumslateblue" },
{ 0x00fa9a, "mediumspringgreen" },
{ 0x48d1cc, "mediumturquoise" },
{ 0xc71585, "mediumvioletred" },
{ 0x191970, "midnightblue" },
{ 0xf5fffa, "mintcream" },
{ 0xffe4e1, "mistyrose" },
{ 0xffe4b5, "moccasin" },
{ 0xffdead, "navajowhite" },
{ 0xfdf5e6, "oldlace" },
{ 0x6b8e23, "olivedrab" },
{ 0xff4500, "orangered" },
{ 0xda70d6, "orchid" },
{ 0xeee8aa, "palegoldenrod" },
{ 0x98fb98, "palegreen" },
{ 0xafeeee, "paleturquoise" },
{ 0xdb7093, "palevioletred" },
{ 0xffefd5, "papayawhip" },
{ 0xffdab9, "peachpuff" },
{ 0xcd853f, "peru" },
{ 0xffc0cb, "pink" },
{ 0xdda0dd, "plum" },
{ 0xb0e0e6, "powderblue" },
{ 0xbc8f8f, "rosybrown" },
{ 0x4169e1, "royalblue" },
{ 0x8b4513, "saddlebrown" },
{ 0xfa8072, "salmon" },
{ 0xf4a460, "sandybrown" },
{ 0x2e8b57, "seagreen" },
{ 0xfff5ee, "seashell" },
{ 0xa0522d, "sienna" },
{ 0x87ceeb, "skyblue" },
{ 0x6a5acd, "slateblue" },
{ 0x708090, "slategray" },
{ 0x708090, "slategrey" },
{ 0xfffafa, "snow" },
{ 0x00ff7f, "springgreen" },
{ 0x4682b4, "steelblue" },
{ 0xd2b48c, "tan" },
{ 0xd8bfd8, "thistle" },
{ 0xff6347, "tomato" },
{ 0x40e0d0, "turquoise" },
{ 0xee82ee, "violet" },
{ 0xf5deb3, "wheat" },
{ 0xf5f5f5, "whitesmoke" },
{ 0x9acd32, "yellowgreen" },
// CSS Color Module Level 4
{ 0x663399, "rebeccapurple" },
// (Fallback)
{ 0x000000, nullptr }
};
for (size_t i = 0; !web_colors[i].name.is_null(); ++i) {
if (string == web_colors[i].name)
return Color::from_rgb(web_colors[i].color);
}
if (string.starts_with("rgb(") && string.ends_with(")"))
return parse_rgb_color(string);
if (string.starts_with("rgba(") && string.ends_with(")"))
return parse_rgba_color(string);
if (string[0] != '#')
return {};
auto hex_nibble_to_u8 = [](char nibble) -> Optional<u8> {
if (!isxdigit(nibble))
return {};
if (nibble >= '0' && nibble <= '9')
return nibble - '0';
return 10 + (tolower(nibble) - 'a');
};
if (string.length() == 4) {
Optional<u8> r = hex_nibble_to_u8(string[1]);
Optional<u8> g = hex_nibble_to_u8(string[2]);
Optional<u8> b = hex_nibble_to_u8(string[3]);
if (!r.has_value() || !g.has_value() || !b.has_value())
return {};
return Color(r.value() * 17, g.value() * 17, b.value() * 17);
}
if (string.length() == 5) {
Optional<u8> r = hex_nibble_to_u8(string[1]);
Optional<u8> g = hex_nibble_to_u8(string[2]);
Optional<u8> b = hex_nibble_to_u8(string[3]);
Optional<u8> a = hex_nibble_to_u8(string[4]);
if (!r.has_value() || !g.has_value() || !b.has_value() || !a.has_value())
return {};
return Color(r.value() * 17, g.value() * 17, b.value() * 17, a.value() * 17);
}
if (string.length() != 7 && string.length() != 9)
return {};
auto to_hex = [&](char c1, char c2) -> Optional<u8> {
auto nib1 = hex_nibble_to_u8(c1);
auto nib2 = hex_nibble_to_u8(c2);
if (!nib1.has_value() || !nib2.has_value())
return {};
return nib1.value() << 4 | nib2.value();
};
Optional<u8> r = to_hex(string[1], string[2]);
Optional<u8> g = to_hex(string[3], string[4]);
Optional<u8> b = to_hex(string[5], string[6]);
Optional<u8> a = string.length() == 9 ? to_hex(string[7], string[8]) : Optional<u8>(255);
if (!r.has_value() || !g.has_value() || !b.has_value() || !a.has_value())
return {};
return Color(r.value(), g.value(), b.value(), a.value());
}
const LogStream& operator<<(const LogStream& stream, Color value)
{
return stream << value.to_string();
}
}
bool IPC::encode(IPC::Encoder& encoder, const Color& color)
{
encoder << color.value();
return true;
}
bool IPC::decode(IPC::Decoder& decoder, Color& color)
{
u32 rgba = 0;
if (!decoder.decode(rgba))
return false;
color = Color::from_rgba(rgba);
return true;
}
void AK::Formatter<Gfx::Color>::format(FormatBuilder& builder, const Gfx::Color& value)
{
Formatter<StringView>::format(builder, value.to_string());
}
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