51 lines
1.6 KiB
C++
51 lines
1.6 KiB
C++
/*
|
|
* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
|
|
*
|
|
* Copyright 2010-2017 Danny Robson <danny@nerdcruft.net>
|
|
*/
|
|
|
|
#include "colour.hpp"
|
|
|
|
#include "ascii.hpp"
|
|
#include "parse/value.hpp"
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
static cruft::srgba4f
|
|
parse_hex (cruft::view<const char*> &str)
|
|
{
|
|
if (str.size () != strlen ("#012345"))
|
|
throw std::invalid_argument ("expected length of 7");
|
|
|
|
if (str[0] != '#')
|
|
throw std::invalid_argument ("expected leading '#'");
|
|
|
|
if (!cruft::ascii::is_hex (str[1]) ||
|
|
!cruft::ascii::is_hex (str[2]) ||
|
|
!cruft::ascii::is_hex (str[3]) ||
|
|
!cruft::ascii::is_hex (str[4]) ||
|
|
!cruft::ascii::is_hex (str[5]) ||
|
|
!cruft::ascii::is_hex (str[6]))
|
|
{
|
|
throw std::invalid_argument ("expected hex digits");
|
|
}
|
|
|
|
uint8_t r = cruft::ascii::from_hex (str[1]) << 4u | cruft::ascii::from_hex (str[2]);
|
|
uint8_t g = cruft::ascii::from_hex (str[3]) << 4u | cruft::ascii::from_hex (str[4]);
|
|
uint8_t b = cruft::ascii::from_hex (str[5]) << 4u | cruft::ascii::from_hex (str[6]);
|
|
|
|
str = str.consume (7u);
|
|
return cruft::srgba<4,uint8_t> { r, g, b, 255 }.template cast<float> ();
|
|
}
|
|
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
template <>
|
|
cruft::srgba4f
|
|
cruft::parse::value<cruft::srgba4f> (cruft::view<const char*> &str)
|
|
{
|
|
return parse_hex (str);
|
|
} |