127 lines
3.3 KiB
PHP
127 lines
3.3 KiB
PHP
<?php
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use Vn\Lib\UserException;
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class Image {
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/**
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* Creates an image resource from a valid image file.
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*
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* @param string $srcFile The source file name
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**/
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static function create($srcFile) {
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$imageType = exif_imagetype($srcFile);
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if ($imageType !== FALSE)
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switch ($imageType) {
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case IMAGETYPE_JPEG:
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$image = imagecreatefromjpeg($srcFile);
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break;
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case IMAGETYPE_PNG:
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$image = imagecreatefrompng($srcFile);
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break;
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case IMAGETYPE_GIF:
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$image = imagecreatefromgif ($srcFile);
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break;
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default:
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throw new UserException(s('Bad file format'));
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} else
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throw new UserException(s('Image open error'));
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return $image;
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}
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/**
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* Resizes and saves an image resource.
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*
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* @param resource $image The image resource
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* @param string $dstFile The destination file name
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* @param integer $maxHeight The maximum height of resized image in pixels
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* @param integer $maxWidth The maximum width of resized image in pixels
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* @param boolean $crop Wether to crop the image
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* @param boolean $symbolicSrc If it is not necessary to resize the image creates a symbolic link using the passed path as source
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**/
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static function resizeSave($image, $dstFile, $maxHeight, $maxWidth, $crop = FALSE, $symbolicSrc = NULL) {
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$width = imagesx($image);
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$height = imagesy($image);
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$dirname = dirname($dstFile);
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if (!is_dir($dirname))
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mkdir($dirname, 0775, TRUE);
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if (file_exists($dstFile))
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@unlink($dstFile);
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// Check if it is necessary to resize the image
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if ($height > $maxHeight || $width > $maxWidth) {
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$srcX = 0;
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$srcY = 0;
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$srcWidth = $width;
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$srcHeight = $height;
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$dstWidth = $width;
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$dstHeight = $height;
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if (!$crop) { // Resize
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$ratio = NULL;
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if ($dstWidth > $maxWidth) {
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$ratio = $dstWidth / $maxWidth;
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$dstWidth = $maxWidth;
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$dstHeight =(int)($dstHeight / $ratio);
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}
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if ($dstHeight > $maxHeight) {
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$ratio = $dstHeight / $maxHeight;
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$dstHeight = $maxHeight;
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$dstWidth =(int)($dstWidth / $ratio);
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}
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} else { // Cut & resize
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if ($width > $maxWidth)
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$dstWidth = $maxWidth;
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if ($height > $maxWidth)
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$dstHeight = $maxHeight;
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if ($width <= $maxWidth) {
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if ($height > $srcHeight)
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$srcHeight = $maxHeight;
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} elseif ($height <= $maxHeight) {
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if ($width > $maxWidth)
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$srcWidth = $maxWidth;
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} else {
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$srcWidth = (int) ($maxWidth *($height / $maxHeight));
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$srcHeight = (int) ($maxHeight *($width / $maxWidth));
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if ($srcWidth <= $width)
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$srcHeight = $height;
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else
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$srcWidth = $width;
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}
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if ($width !== $srcWidth)
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$srcX = (int) (($width / 2) -($srcWidth / 2));
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if ($height !== $srcHeight)
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$srcY = (int) (($height / 2) -($srcHeight / 2));
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}
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$resizedImage = imagecreatetruecolor($dstWidth, $dstHeight);
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imagealphablending($resizedImage, FALSE);
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imagesavealpha($resizedImage, TRUE);
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imagecopyresampled($resizedImage, $image,
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0, 0, $srcX, $srcY, $dstWidth, $dstHeight, $srcWidth, $srcHeight);
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$saved = imagepng($resizedImage, $dstFile);
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imagedestroy($resizedImage);
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} elseif (isset($symbolicSrc)) {
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$saved = symlink($symbolicSrc, $dstFile);
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} else {
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imagesavealpha($image, TRUE);
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$saved = imagepng($image, $dstFile);
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}
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if (!$saved)
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throw new UserException(sprintf(s('File save error: %s'), $dstFile));
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}
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}
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