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LibGfx: Add a naive "rgba(r,g,b,a)" color parser

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It's not very whitespace tolerant but it works.
This commit is contained in:
Andreas Kling 2020-05-05 15:49:38 +02:00
parent 8a40294f42
commit b7339745d0
Notes: sideshowbarker 2024-07-19 06:57:07 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/b7339745d0f
1 changed files with 41 additions and 0 deletions
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41
Libraries/LibGfx/Color.cpp
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@ -34,6 +34,7 @@
#include <LibIPC/Decoder.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
namespace Gfx {
@ -159,6 +160,43 @@ static Optional<Color> parse_rgb_color(const StringView& string)
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 {};
bool ok;
auto r = parts[0].to_int(ok);
if (!ok)
return {};
auto g = parts[1].to_int(ok);
if (!ok)
return {};
auto b = parts[2].to_int(ok);
if (!ok)
return {};
double alpha = strtod(String(parts[3]).characters(), nullptr);
int a = alpha * 255;
if (r < 0 || r > 255)
return {};
if (g < 0 || g > 255)
return {};
if (b < 0 || b > 255)
return {};
if (a < 0 || a > 255)
return {};
return Color(r, g, b, a);
}
Optional<Color> Color::from_string(const StringView& string)
{
if (string.is_empty())
@ -334,6 +372,9 @@ Optional<Color> Color::from_string(const StringView& string)
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 {};