PHP Color::colorSplit方法代码示例

function svg_apply_css_funcs($element, &$raw_data)
{
    // Setup functions for using on values.
    // Note using custom versions of svg-*-gradient().
    static $functions;
    if (!$functions) {
        $functions = new \stdClass();
        $functions->fill = new Functions(array('svg-linear-gradient' => 'CssCrush\\svg_fn_linear_gradient', 'svg-radial-gradient' => 'CssCrush\\svg_fn_radial_gradient', 'pattern' => 'CssCrush\\svg_fn_pattern'));
        $functions->generic = new Functions(array_diff_key(Crush::$process->functions->register, $functions->fill->register));
    }
    foreach ($raw_data as $property => &$value) {
        $value = $functions->generic->apply($value);
        // Only capturing fills for fill and stoke properties.
        if ($property === 'fill' || $property === 'stroke') {
            $value = $functions->fill->apply($value, $element);
            // If the value is a color with alpha component we split the color
            // and set the corresponding *-opacity property because Webkit doesn't
            // support rgba()/hsla() in SVG.
            if ($components = Color::colorSplit($value)) {
                list($color, $opacity) = $components;
                $raw_data[$property] = $color;
                if ($opacity < 1) {
                    $raw_data += array("{$property}-opacity" => $opacity);
                }
            }
        }
    }
}

function parse_gradient_color_stops(array $color_stop_args)
{
    $offsets = array();
    $colors = array();
    $offset_patt = '~ +([\\d\\.]+%)$~';
    $last_index = count($color_stop_args) - 1;
    foreach ($color_stop_args as $index => $color_arg) {
        if (preg_match($offset_patt, $color_arg, $m)) {
            $offsets[] = floatval($m[1]);
            $color = preg_replace($offset_patt, '', $color_arg);
        } else {
            if ($index === 0) {
                $offsets[] = 0;
            } elseif ($index === $last_index) {
                $offsets[] = 100;
            } else {
                $offsets[] = null;
            }
            $color = $color_arg;
        }
        // For hsla()/rgba() extract alpha component from color values and
        // convert to hsl()/rgb().
        // Webkit doesn't support them for SVG colors.
        $colors[] = Color::colorSplit($color);
    }
    // For unspecified color offsets fill in the blanks.
    $next_index_not_null = 0;
    $prev_index_not_null = 0;
    $n = count($offsets);
    foreach ($offsets as $index => $offset) {
        if (!isset($offset)) {
            // Scan for next non-null offset.
            for ($i = $index; $i < $n; $i++) {
                if (isset($offsets[$i])) {
                    $next_index_not_null = $i;
                    break;
                }
            }
            // Get the difference between previous 'not null' offset and the next 'not null' offset.
            // Divide by the number of null offsets to get a value for padding between them.
            $padding_increment = ($offsets[$next_index_not_null] - $offsets[$prev_index_not_null]) / ($next_index_not_null - $index + 1);
            $padding = $padding_increment;
            for ($i = $index; $i < $n; $i++) {
                if (isset($offsets[$i])) {
                    break;
                }
                // Replace the null offset with the new padded value.
                $offsets[$i] = $offsets[$prev_index_not_null] + $padding;
                // Bump the padding for the next null offset.
                $padding += $padding_increment;
            }
        } else {
            $prev_index_not_null = $index;
        }
    }
    $stops = '';
    foreach (array_combine($offsets, $colors) as $offset => $color) {
        list($color_value, $opacity) = $color;
        $stop_opacity = $opacity < 1 ? " stop-opacity=\"{$opacity}\"" : '';
        $stops .= "<stop offset=\"{$offset}%\" stop-color=\"{$color_value}\"{$stop_opacity}/>";
    }
    return $stops;
}