forked from verdnatura/hedera-web
147 lines
3.4 KiB
PHP
147 lines
3.4 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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/**
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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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{
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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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{
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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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}
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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, $symbolicSrc = NULL)
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{
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$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 > $maxWidth)
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{
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$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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{
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$ratio = NULL;
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if ($dstWidth > $maxWidth)
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{
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$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 > $maxHeight)
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{
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$ratio = $dstHeight / $maxHeight;
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$dstHeight = $maxHeight;
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$dstWidth = (int) ($dstWidth / $ratio);
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}
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}
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else // Cut & resize
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{
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if ($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 <= $maxWidth)
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{
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if ($height > $srcHeight)
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$srcHeight = $maxHeight;
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}
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elseif ($height <= $maxHeight)
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{
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if ($width > $maxWidth)
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$srcWidth = $maxWidth;
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}
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else
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{
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$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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}
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elseif (isset ($symbolicSrc))
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{
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$saved = symlink ($symbolicSrc, $dstFile);
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}
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else
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{
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imagesavealpha ($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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