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ladybird/Userland/Libraries/LibGfx/Color.cpp
sin-ack c70f45ff44 Everywhere: Explicitly specify the size in StringView constructors 
This commit moves the length calculations out to be directly on the
StringView users. This is an important step towards the goal of removing
StringView(char const*), as it moves the responsibility of calculating
the size of the string to the user of the StringView (which will prevent
naive uses causing OOB access).
2022-07-12 23:11:35 +02:00

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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#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 <stdlib.h>
namespace Gfx {
String Color::to_string() const
{
return String::formatted("#{:02x}{:02x}{:02x}{:02x}", red(), green(), blue(), alpha());
}
String Color::to_string_without_alpha() const
{
return String::formatted("#{:02x}{:02x}{:02x}", red(), green(), blue());
}
static Optional<Color> parse_rgb_color(StringView string)
{
VERIFY(string.starts_with("rgb(", CaseSensitivity::CaseInsensitive));
VERIFY(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(StringView string)
{
VERIFY(string.starts_with("rgba(", CaseSensitivity::CaseInsensitive));
VERIFY(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(StringView string)
{
if (string.is_empty())
return {};
struct ColorAndWebName {
constexpr ColorAndWebName(ARGB32 c, char const* n)
: color(c)
, name(n != nullptr ? StringView { n, __builtin_strlen(n) } : StringView {})
{
}
ARGB32 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 }
};
if (string.equals_ignoring_case("transparent"))
return Color::from_argb(0x00000000);
for (size_t i = 0; !web_colors[i].name.is_null(); ++i) {
if (string.equals_ignoring_case(web_colors[i].name))
return Color::from_rgb(web_colors[i].color);
}
if (string.starts_with("rgb(", CaseSensitivity::CaseInsensitive) && string.ends_with(")"))
return parse_rgb_color(string);
if (string.starts_with("rgba(", CaseSensitivity::CaseInsensitive) && 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());
}
Vector<Color> Color::shades(u32 steps, float max) const
{
float shade = 1.f;
float step = max / steps;
Vector<Color> shades;
for (u32 i = 0; i < steps; i++) {
shade -= step;
shades.append(this->darkened(shade));
}
return shades;
}
Vector<Color> Color::tints(u32 steps, float max) const
{
float shade = 1.f;
float step = max / steps;
Vector<Color> tints;
for (u32 i = 0; i < steps; i++) {
shade += step;
tints.append(this->lightened(shade));
}
return tints;
}
}
bool IPC::encode(Encoder& encoder, Color const& color)
{
encoder << color.value();
return true;
}
ErrorOr<void> IPC::decode(Decoder& decoder, Color& color)
{
u32 rgba;
TRY(decoder.decode(rgba));
color = Color::from_argb(rgba);
return {};
}
ErrorOr<void> AK::Formatter<Gfx::Color>::format(FormatBuilder& builder, Gfx::Color const& value)
{
return Formatter<StringView>::format(builder, value.to_string());
}
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