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Admin/Public: add simple watermark settings

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Add watermark controls in admin settings for text, brightness, and angle while keeping the UI lightweight. Apply these settings to public watermark rendering for after-photos with safe value clamping across Imagick and GD output paths.
This commit is contained in:
a.andreev
2026-02-21 14:07:29 +03:00
parent 13f5c603ce
commit bb68d36641
2 changed files with 47 additions and 16 deletions
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index.php
+16 -5
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@@ -317,14 +317,23 @@ function serveThumb(): never
function outputWatermarked(string $path, string $mime): never
{
$text = 'photo.andr33v.ru';
$text = trim(settingGet('watermark_text', 'photo.andr33v.ru'));
if ($text === '') {
$text = 'photo.andr33v.ru';
}
$brightness = max(5, min(100, (int)settingGet('watermark_brightness', '35')));
$angle = max(-75, min(75, (int)settingGet('watermark_angle', '-28')));
$imagickOpacity = 0.04 + ($brightness / 100) * 0.24;
$gdAlpha = (int)round(127 - ($brightness * 0.9));
$gdAlpha = max(10, min(126, $gdAlpha));
if (extension_loaded('imagick')) {
$im = new Imagick($path);
$w = max(1, (int)$im->getImageWidth());
$h = max(1, (int)$im->getImageHeight());
$draw = new ImagickDraw();
$draw->setFillColor(new ImagickPixel('rgba(255,255,255,0.16)'));
$draw->setFillColor(new ImagickPixel('rgba(255,255,255,' . number_format($imagickOpacity, 3, '.', '') . ')'));
$draw->setFontSize(max(12, (int)($w / 46)));
$draw->setTextAntialias(true);
@@ -333,7 +342,7 @@ function outputWatermarked(string $path, string $mime): never
$stepX = max(120, (int)($w / 3));
for ($y = -$h; $y < $h * 2; $y += $stepY) {
for ($x = -$w; $x < $w * 2; $x += $stepX) {
$im->annotateImage($draw, $x, $y, -28, $lineText);
$im->annotateImage($draw, $x, $y, $angle, $lineText);
}
}
@@ -359,13 +368,15 @@ function outputWatermarked(string $path, string $mime): never
}
$font = 2;
$color = imagecolorallocatealpha($img, 255, 255, 255, 96);
$color = imagecolorallocatealpha($img, 255, 255, 255, $gdAlpha);
$lineText = $text . ' ' . $text . ' ' . $text;
$stepY = max(16, imagefontheight($font) + 8);
$stepX = max(120, (int)($w / 3));
$row = 0;
$skew = max(6, min(48, (int)round(abs($angle))));
$dir = $angle < 0 ? 1 : -1;
for ($y = -$h; $y < $h * 2; $y += $stepY) {
$offset = ($row * 22) % $stepX;
$offset = ($row * $skew * $dir) % $stepX;
for ($x = -$w - $offset; $x < $w * 2; $x += $stepX) {
imagestring($img, $font, $x, $y, $lineText, $color);
}