image.inc.php

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<?php
class Img
{
    public static function rotate($inputFile, $outputFile, $degrees)
    {
        //error checking.
        if (!is_numeric($degrees))
            throw new Exception("Img::rotate - invalid degrees: $degrees");

        //setup our call.
        $inputFile = escapeshellarg($inputFile);
        $outputFile = escapeshellarg($outputFile);
        $call = "/usr/bin/convert -rotate $degrees $inputFile $outputFile";
        
        //do it!
        Util::shellExec($call);
    }

    public static function flip($inputFile, $outputFile, $type)
    {
        if ($type == "horizontal")
            $arg = "flop";
        else if ($type == "vertical")
            $arg = "flip";
        else
            throw new Exception("imageFlip: invalid type: $type");

        //setup our call.
        $inputFile = escapeshellarg($inputFile);
        $outputFile = escapeshellarg($outputFile);
        $call = "/usr/bin/convert -$arg $inputFile $outputFile";

        //do it!
        Util::shellExec($call);
    }

    public static function resize($inputFile, $outputFile, $maxDimension, $execute = true)
    {
        if (preg_match("/\d*:\d*/", $maxDimension))
        {
            list ($maxX, $maxY) = explode(':', $maxDimension);
        }
        else
        {
            $maxX = $maxY = $maxDimension;
        }

        if (!is_numeric($maxX) || !is_numeric($maxY))
            throw new Exception("imageResize: invalid maximum dimension: $maxDimension");

        //setup our call.
        $inputFile = escapeshellarg($inputFile);
        $outputFile = escapeshellarg($outputFile);
        $call = "/usr/bin/convert -size ${maxX}x${maxY} $inputFile -resize '${maxX}x${maxY}>' +profile \"*\" $outputFile";

        //do it!
        if ($execute)
            Util::shellExec($call);
        else
            echo "$call;\n";
    }

    public static function crop($inputFile, $outputFile, $dimensions)
    {
        $inputFile = escapeshellarg($inputFile);
        $outputFile = escapeshellarg($outputFile);
        $call = "/usr/bin/convert -crop $dimensions $inputFile +profile \"*\" $outputFile";
        
        Util::shellExec($call);
    }

    public static function convert($inputFile, $outputFile, $flags = "")
    {
        $inputFile = escapeshellarg($inputFile);
        $outputFile = escapeshellarg($outputFile);
        $call = "/usr/bin/convert $flags $inputFile $outputFile";
        
        Util::shellExec($call);
    }

    public static function scale($inputFile, $outputFile, $width = null, $height = null, $force = false)
    {
        $inputFile = escapeshellarg($inputFile);
        $outputFile = escapeshellarg($outputFile);
        if ($force)
            $force = "!";
        else
            $force = "";

        if ($width && !$height)
            $call = "/usr/bin/convert -geometry ${width}$force $inputFile $outputFile";
        else if ($height && !$width)
            $call = "/usr/bin/convert -geometry x${height}$force $inputFile $outputFile";
        else if ($height && $width)
            $call = "/usr/bin/convert -geometry ${width}x${height}$force $inputFile $outputFile";
        else
            return false;
        Util::shellExec($call);

        return true;
    }
}
?>

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