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LibGfx: Factor out #rrggbb Color parsing into its own helper function

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This commit is contained in:
Andrew Kaster 2024-07-22 14:10:16 -06:00
parent 3c5e3eef10
commit cf42bf2bca
Notes: github-actions[bot] 2024-07-31 00:39:35 +00:00 
Author: https://github.com/ADKaster
Commit: https://github.com/LadybirdBrowser/ladybird/commit/cf42bf2bcac
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/821
1 changed files with 53 additions and 49 deletions
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102
Userland/Libraries/LibGfx/Color.cpp
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@ -262,60 +262,64 @@ Optional<Color> Color::from_named_css_color_string(StringView string)
return {};
}
static Optional<Color> hex_string_to_color(StringView string)
{
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());
}
Optional<Color> Color::from_string(StringView string)
{
if (string.is_empty())
return {};
if (string[0] == '#') {
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());
}
if (string[0] == '#')
return hex_string_to_color(string);
if (string.starts_with("rgb("sv, CaseSensitivity::CaseInsensitive) && string.ends_with(')'))
return parse_rgb_color(string);