functions.scss

// CSS Preprocessor
// Copyright (c) 2015-2019  Made to Order Software Corp.  All Rights Reserved
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

@mixin adjust_hue($color, $angle)
{
    @return hsla(deg2rad(hue($color)) + $angle, saturation($color), lightness($color), alpha($color));
}

@mixin complement($color)
{
    @return adjust_hue($color, $_csspp_pi_rad);
}

@mixin darken($color, $percent)
{
    @return lighten($color, - $percent);
}

@mixin deg2rad($angle)
{
    @return $angle * $_csspp_pi_rad / 180deg;
}

@mixin desaturate($color, $percent)
{
    @return saturate($color, - $percent);
}

@mixin fade_in($color, $number)
{
    @return opacify($color, $number);
}

@mixin fade_out($color, $number)
{
    @return transparentize($color, $number);
}

@mixin grayscale($color)
{
    // TBD: we may want to use a much better gray scale computation
    //      (i.e. the Y in JPEG images is much better to the eye than
    //      the L in HSL.)
    @return saturate($color, - saturation($color));
}

@mixin invert($color)
{
    @return rgba(255.0 - red($color), 255.0 - green($color), 255.0 - blue($color), alpha($color));
}

@mixin lighten($color, $percent)
{
    @return hsla(hue($color), saturation($color), lightness($color) + $percent, alpha($color));
}

@mixin mix($color1, $color2, $weight: 0.5)
{
    @return $color1 * $weight + $color2 * (1.0 - $weight);
}

@mixin opacify($color, $number)
{
    @return rgba($color, alpha($color) + $number);
}

@mixin opacity($color)
{
    @return alpha($color);
}

@mixin quote($identifier)
{
    @return string($identifier);
}

@mixin remove_unit($value)
{
    @return unit($value) = "%"
                ? decimal_number($value)
                : type_of($value) = "integer"
                    ? $value / integer("1" + unit($value))
                    : $value / decimal_number("1" + unit($value));
}

@mixin saturate($color, $percent)
{
    @return hsla(hue($color), saturation($color) + $percent, lightness($color), alpha($color));
}

@mixin set_unit($value, $unit)
{
    @return string($unit) = "%"
                ? percentage($value)
                : type_of($value) = "integer"
                    ? integer(string(remove_unit($value)) + string($unit))
                    : decimal_number(string(remove_unit($value)) + string($unit));
}

@mixin transparentize($color, $number)
{
    @return rgba($color, alpha($color) - $number);
}

@mixin unitless($number)
{
    @return unit($number) = "";
}

@mixin unquote($string)
{
    @return identifier($string);
}

// Local Variables:
// mode: scss
// indent-tabs-mode: nil
// tab-width: 4
// End:

// vim: ts=4 sw=4 et