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Use DPI=96 + add absolute and relative sizes + add missing value units

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This commit is contained in:
Artem Pavlenko 2021-04-12 14:16:39 +01:00
parent 4f783f61ed
commit ff8c411749
1 changed files with 36 additions and 9 deletions
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45
include/mapnik/css/css_unit_value.hpp
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@ -33,18 +33,45 @@ namespace x3 = boost::spirit::x3;
// units
struct css_unit_value : x3::symbols<double>
{
const double DPI = 90;
constexpr static double DPI = 96;
css_unit_value()
{
add
("px", 1.0)
("pt", DPI/72.0)
("pc", DPI/6.0)
("mm", DPI/25.4)
("cm", DPI/2.54)
("in", static_cast<double>(DPI))
//("em", 1.0/16.0) // default pixel size for body (usually 16px)
// ^^ this doesn't work currently as 'e' in 'em' interpreted as part of scientific notation.
("px", 1.0) // pixels
("pt", DPI/72.0) // points
("pc", DPI/6.0) // picas
("mm", DPI/25.4) // milimeters
("Q" , DPI/101.6)// quarter-milimeters
("cm", DPI/2.54) // centimeters
("in", static_cast<double>(DPI)) // inches
;
}
};
struct css_absolute_size : x3::symbols<double>
{
constexpr static double EM = 10.0; // 1em == 10px
css_absolute_size()
{
add
("xx-small", 0.6 * EM)
("x-small", 0.75 * EM)
("small", 0.88 * EM)
("medium", 1.0 * EM)
("large", 1.2 * EM)
("x-large", 1.5 * EM)
("xx-large", 2.0 * EM)
;
}
};
struct css_relative_size : x3::symbols<double>
{
css_relative_size()
{
add
("larger", 1.2)
("smaller", 0.8)
;
}
};