/*
 * Copyright (c) 2016 Martin Donath <martin.donath@squidfunk.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

/* ----------------------------------------------------------------------------
 * Pixel conversion helpers
 * ------------------------------------------------------------------------- */

/*
 * Convert font size in px to em.
 *
 * @param  {Number} $size Font size in px
 * @param  {Number} $base Base font size
 * @return {Number}       Font size in em
 */
@function px2em($size, $base: 16px) {
  @if unit($size) == px {
    @return ($size / $base) * 1.0em;
  } @else {
    @error "Invalid unit: #{$size} - must be px";
  }
}

/*
 * Convert font size in px to rem.
 *
 * @param  {Number} $size Font size in px
 * @return {Number}       Font size in rem
 */
@function px2rem($size, $base: 10px) {
  @if unit($size) == px {
    @return ($size / $base) * 1.0rem;
  } @else {
    @error "Invalid unit: #{$size} - must be px";
  }
}