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Code Issues Releases Activity

Fix inverse invalid color

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This commit is contained in:
MatteoPistorello 2023-05-31 17:21:33 +02:00
parent 41f6c4da82
commit b1dec0f818
1 changed files with 19 additions and 15 deletions
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34
lib/util.php
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@ -448,21 +448,25 @@ if (!function_exists('color_inverse')) {
*/ */
function color_inverse($start_colour) function color_inverse($start_colour)
{ {
$R1 = hexdec(substr($start_colour, 1, 2)); if (preg_match('/^#[a-f0-9]{6}$/i', $start_colour)) { //hex color is valid
$G1 = hexdec(substr($start_colour, 3, 2)); $R1 = hexdec(substr($start_colour, 1, 2));
$B1 = hexdec(substr($start_colour, 5, 2)); $G1 = hexdec(substr($start_colour, 3, 2));
$R2 = 255; $B1 = hexdec(substr($start_colour, 5, 2));
$G2 = 255; $R2 = 255;
$B2 = 255; $G2 = 255;
$L1 = 0.2126 * pow($R1 / 255, 2.2) + 0.7152 * pow($G1 / 255, 2.2) + 0.0722 * pow($B1 / 255, 2.2); $B2 = 255;
$L2 = 0.2126 * pow($R2 / 255, 2.2) + 0.7152 * pow($G2 / 255, 2.2) + 0.0722 * pow($B2 / 255, 2.2); $L1 = 0.2126 * pow($R1 / 255, 2.2) + 0.7152 * pow($G1 / 255, 2.2) + 0.0722 * pow($B1 / 255, 2.2);
if ($L1 > $L2) { $L2 = 0.2126 * pow($R2 / 255, 2.2) + 0.7152 * pow($G2 / 255, 2.2) + 0.0722 * pow($B2 / 255, 2.2);
$lum = ($L1 + 0.05) / ($L2 + 0.05); if ($L1 > $L2) {
} else { $lum = ($L1 + 0.05) / ($L2 + 0.05);
$lum = ($L2 + 0.05) / ($L1 + 0.05); } else {
} $lum = ($L2 + 0.05) / ($L1 + 0.05);
if ($lum >= 2.5) { }
return '#fff'; if ($lum >= 2.5) {
return '#fff';
} else {
return '#000';
}
} else { } else {
return '#000'; return '#000';
} }