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Add a CSS corner if the contrast between QR margin and page background is too low

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This commit is contained in:
Miraty 2021-12-06 20:53:23 +01:00
commit 2a6a4ad056
3 changed files with 62 additions and 9 deletions
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28
index.php
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@ -76,6 +76,8 @@ if (
require_once "less.php/lib/Less/Autoloader.php";
Less_Autoloader::register();
$colorScheme['theme'] = $theme;
$options = array('cache_dir' => 'css/', 'compress' => true);
$cssFileName = Less_Cache::Get(array("style.less" => ""), $options, $colorScheme);
?>
@ -194,6 +196,12 @@ if (
if (!empty($params['txt'])) {
$rgbBgColor = array(
'r' => hexdec(substr($params['bgColor'],0,2)),
'g' => hexdec(substr($params['bgColor'],2,2)),
'b' => hexdec(substr($params['bgColor'],4,2)),
);
require "barcode-generator/Utils/QrCode.php";
$qrCode = new QrCode();
if (!is_null($params['margin']))
@ -207,11 +215,7 @@ if (
'g' => hexdec(substr($params['mainColor'],2,2)),
'b' => hexdec(substr($params['mainColor'],4,2)),
))
->setBackgroundColor(array(
'r' => hexdec(substr($params['bgColor'],0,2)),
'g' => hexdec(substr($params['bgColor'],2,2)),
'b' => hexdec(substr($params['bgColor'],4,2)),
))
->setBackgroundColor($rgbBgColor)
->setImageType(QrCode::IMAGE_TYPE_PNG);
$dataUri = $qrCode->getDataUri();
$qrSize = $qrCode->getSize() + 2 * $qrCode->getPadding();
@ -224,7 +228,19 @@ if (
</div>
<div class="centered" id="showOnlyQR">
<a title="<?= $loc['title_showOnlyQR'] ?>" href="<?= $dataUri ?>"><img width="<?= $qrSize ?>" height="<?= $qrSize ?>" alt='<?= $loc['alt_QR_before'] ?><?= htmlspecialchars($params['txt']); ?><?= $loc['alt_QR_after'] ?>' id="qrCode" src="<?= $dataUri ?>"></a>
<a title="<?= $loc['title_showOnlyQR'] ?>" href="<?= $dataUri ?>"><img width="<?= $qrSize ?>" height="<?= $qrSize ?>" alt='<?= $loc['alt_QR_before'] ?><?= htmlspecialchars($params['txt']); ?><?= $loc['alt_QR_after'] ?>' id="qrCode"<?php
// Compute the difference between the QR code and theme background colors
$diffLight = abs($rgbBgColor['r']-hexdec(substr($colorScheme['bg-light'],-6,2))) + abs($rgbBgColor['g']-hexdec(substr($colorScheme['bg-light'],-4,2))) + abs($rgbBgColor['b']-hexdec(substr($colorScheme['bg-light'],-2,2)));
$diffDark = abs($rgbBgColor['r']-hexdec(substr($colorScheme['bg-dark'],-6,2))) + abs($rgbBgColor['g']-hexdec(substr($colorScheme['bg-dark'],-4,2))) + abs($rgbBgColor['b']-hexdec(substr($colorScheme['bg-dark'],-2,2)));
// Determine whether a CSS corner is needed to let the user see the margin of the QR code
$contrastThreshold = 64;
if ($diffLight < $contrastThreshold)
echo " class='needLightContrast'";
if ($diffDark < $contrastThreshold)
echo " class='needDarkContrast'";
?> src="<?= $dataUri ?>"></a>
</div>
</section>