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support hsl colors for boost versions 1.42 - 1.45

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This commit is contained in:
Dane Springmeyer 2011-07-01 18:54:01 +00:00
parent eab80c5a91
commit 161d978fb4
1 changed files with 65 additions and 1 deletions
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66
include/mapnik/css_color_grammar_deprecated.hpp
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@ -284,6 +284,55 @@ struct alpha_conv_impl
};
// http://www.w3.org/TR/css3-color/#hsl-color
inline double hue_to_rgb( double m1, double m2, double h)
{
if (h < 0.0) h = h + 1.0;
else if (h > 1) h = h - 1.0;
if (h * 6 < 1.0)
return m1 + (m2 - m1) * h * 6.0;
if (h * 2 < 1.0)
return m2;
if (h * 3 < 2.0)
return m1 + (m2 - m1)* (2.0/3.0 - h) * 6.0;
return m1;
}
struct hsl_conv_impl
{
template<typename T0,typename T1, typename T2, typename T3>
struct result
{
typedef void type;
};
template <typename T0,typename T1, typename T2, typename T3>
void operator() (T0 & c, T1 h, T2 s, T3 l) const
{
double m1,m2;
// normalize values
h /= 360.0;
s /= 100.0;
l /= 100.0;
if (l <= 0.5)
m2 = l * (s + 1.0);
else
m2 = l + s - l*s;
m1 = l * 2 - m2;
double r = hue_to_rgb(m1, m2, h + 1.0/3.0);
double g = hue_to_rgb(m1, m2, h);
double b = hue_to_rgb(m1, m2, h - 1.0/3.0);
c.r = clip_int<0,255>(int((255.0 * r) + 0.5));
c.g = clip_int<0,255>(int((255.0 * g) + 0.5));
c.b = clip_int<0,255>(int((255.0 * b) + 0.5));
}
};
template <typename Iterator>
struct css_color_grammar : qi::grammar<Iterator, css(), ascii_space_type>
{
@ -296,11 +345,15 @@ struct css_color_grammar : qi::grammar<Iterator, css(), ascii_space_type>
using qi::_val;
using qi::double_;
using qi::_1;
using qi::_a;
using qi::_b;
using qi::_c;
using ascii::no_case;
using phoenix::at_c;
css_color %= rgba_color
| rgba_percent_color
| rgba_percent_color
| hsl_percent_color
| hex_color
| hex_color_small
| no_case[named];
@ -336,6 +389,15 @@ struct css_color_grammar : qi::grammar<Iterator, css(), ascii_space_type>
>> -(','>> -double_ [at_c<3>(_val) = alpha_converter(_1)])
>> lit(')')
;
hsl_percent_color = lit("hsl") >> -lit('a')
>> lit('(')
>> double_ [ _a = _1] >> ',' // hue 0..360
>> double_ [ _b = _1] >> '%' >> ',' // saturation 0..100%
>> double_ [ _c = _1] >> '%' // lightness 0..100%
>> -(','>> -double_ [at_c<3>(_val) = alpha_converter(_1)]) // opacity 0...1
>> lit (')') [ hsl_converter(_val,_a,_b,_c)]
;
}
qi::uint_parser< unsigned, 16, 2, 2 > hex2 ;
@ -343,12 +405,14 @@ struct css_color_grammar : qi::grammar<Iterator, css(), ascii_space_type>
qi::uint_parser< unsigned, 10, 1, 3 > dec3 ;
qi::rule<Iterator, css(), ascii_space_type> rgba_color;
qi::rule<Iterator, css(), ascii_space_type> rgba_percent_color;
qi::rule<Iterator, qi::locals<double,double,double>,css(), ascii_space_type> hsl_percent_color;
qi::rule<Iterator, css(), ascii_space_type> hex_color;
qi::rule<Iterator, css(), ascii_space_type> hex_color_small;
qi::rule<Iterator, css(), ascii_space_type> css_color;
named_colors_ named;
phoenix::function<percent_conv_impl> percent_converter;
phoenix::function<alpha_conv_impl> alpha_converter;
phoenix::function<hsl_conv_impl> hsl_converter;
};
}