function scale_size($size, $scale_width, $scale_height)
{
if (preg_match("#(-?[0-9]+)(|px) (-?[0-9]+)(|px)#im", $size, $match)) {
return print_dimensions($match[1] * $scale_width, $match[3] * $scale_height);
} else {
throw new SpritifyException("Invalid size to scale '{$size}'");
}
}
}
if ($background_size) {
// now work out what this 'background' property will be replaced with
$desired_width = -1;
$desired_height = -1;
if (preg_match("#([0-9]+)px ([0-9]+)px#im", $background_size, $match)) {
$desired_width = $match[1];
$desired_height = $match[2];
} else {
throw new SpritifyException("Rule '{$head}': Only background-size supported syntax is Xpx Ypx: '{$background_size}'");
}
// work out scale
$total_size = count($sprites) * ($max_sprite_height + $sprite_padding);
$scale_width = $desired_width / $sizes[0];
$scale_height = $desired_height / $sizes[1];
$sprite_size = print_dimensions($max_sprite_width, $total_size);
// debug
if ($debug) {
$css[$rule_index]['properties'][] = array('key' => 'x-desired-size', 'value' => $background_size);
$css[$rule_index]['properties'][] = array('key' => 'x-total-count', 'value' => count($sprites));
$css[$rule_index]['properties'][] = array('key' => 'x-actual-size', 'value' => $sizes[0] . " " . $sizes[1]);
$css[$rule_index]['properties'][] = array('key' => 'x-total-size', 'value' => count($sprites) * ($max_sprite_height + $sprite_padding));
$css[$rule_index]['properties'][] = array('key' => 'x-scale', 'value' => "{$scale_width} {$scale_height}");
$css[$rule_index]['properties'][] = array('key' => 'x-sprite-size', 'value' => $sprite_size);
}
// scale both background-size and background-scale appropriately
foreach ($css[$rule_index]['properties'] as $i => $property2) {
if ($property2['key'] == 'background-size') {
$css[$rule_index]['properties'][$i]['value'] = scale_size($sprite_size, $scale_width, $scale_height);
}
if ($property2['key'] == 'background-position') {
