image_resample.php

<?php

# output resampled image (better qual than resizing).

// if src_imagefile is already set then assume that this script is being 
// included by another script if not then get details

session_start();

include("set_paths.php");

  $filekey = $_SESSION['filekey'];
  $filekey = $_SESSION['filekey'];
  $basedir = $_SESSION['basedir'];
  $src_imgfile = $filelist[$filekey];
  $src_imgfile = "$basedir/$src_imgfile";

// Override session vars if Gets are provided
if ( isset($_GET['filekey']) ) {
  $gallery = $_GET['gallery'];
  if ( isset($_GET['dirkey']) ) $dirkey = $_GET['dirkey'];
  $filekey = $_GET['filekey'];

  #include( dirname(__FILE__)."/imagedata/$gallery");
  include( "$imagedata/$gallery");
  if ( $filekey == "default" ) {
	$src_imgfile = $default_image;
  }
  else {
    include_once("generate_filelist.php");
    $filelist = generate_filelist($gallery, $dirkey);

    $basedir = $dirs[$dirkey];
    $src_imgfile = $filelist[$filekey];
    $src_imgfile = "$basedir/$src_imgfile";
  }
} // End if

  if ( isset($_GET['size']) ) {
    $size = $_GET['size'];
  }

  if ( isset($_GET['xsize']) ) {
    $xsize = $_GET['xsize'];
    unset($size);
  }

  if ( isset($_GET['ysize']) ) {
    $ysize = $_GET['ysize'];
    unset($size);
  }

#$imagecache=dirname(__FILE__)."/imagecache";

if ( isset($xsize) || isset($ysize) ){
  $cachefile="$imagecache/resample/".$xsize."x".$ysize."/$src_imgfile";
}
else $cachefile="$imagecache/resample/$size/$src_imgfile";

# Detect image format - PNG or Jpeg currently supported
$format = "jpeg" ; # assume jpeg by default.
if ( preg_match( "/\.png$/i", "$src_imgfile" ) ) {
  $format="png";
}

$f_imageformat= "image$format";
$f_imagecreatefromformat= "imagecreatefrom$format";

$imageheader="content type: image/$format";
header($imageheader);

// see if the image has already been created in the cache
if ( file_exists("$cachefile") ) {
  // If it does already exist then use it
  $src_img = $f_imagecreatefromformat($cachefile);
  $f_imageformat($src_img);
  imagedestroy($src_img);
  exit() ;
}

// otherwise create a new one
$src_img = $f_imagecreatefromformat($src_imgfile);

$srcsize = getimagesize($src_imgfile);

if ( isset($xsize) || isset($ysize) ){
  list( $dest_x, $dest_y ) =  get_fixed_dimensions($xsize,$ysize, $srcsize[0], $srcsize[1]);
  #list( $dest_x, $dest_y ) =  get_fixed_dimensions($xsize,$ysize);
}
elseif ( isset($size) ) {
  list( $dest_x, $dest_y ) = get_auto_dimensions($size, $srcsize[0], $srcsize[1]);
}
else {
  echo "\n<br/>ERROR: No image sizing defined<br/>\n";
  exit;
}

$dest_img = imagecreatetruecolor($dest_x, $dest_y);

imagecopyresampled($dest_img, $src_img, 0, 0, 0, 0,
	$dest_x, $dest_y, $srcsize[0], $srcsize[1] );

# Output the new image to the user
$f_imageformat($dest_img);

# Save it to image cache
$cachefile_dir = dirname("$cachefile");
mkdir("$cachefile_dir", 0755, true );
$f_imageformat($dest_img, "$cachefile" );

#clean up memory
imagedestroy($src_img);
imagedestroy($dest_img);

function get_fixed_dimensions( $xsize, $ysize, $xsrcsize,$ysrcsize ){

  if ( $xsize > 0 ){
    // x axis size has been specified so set dest_x
    $dest_x = $xsize;
    if ( ! isset( $ysize ) || $ysize == 0 ) $dest_y = ($dest_x/$xsrcsize)*$ysrcsize ;
  }

  if ( $ysize > 0 ){
    // y axis size has been specified so set dest_y
    $dest_y = $ysize;
    if ( ! isset( $xsize ) || $xsize == 0 ) $dest_x = ($dest_y/$ysrcsize)*$xsrcsize ;
  }

  $array = array($dest_x, $dest_y) ;
  return $array;
}

function get_auto_dimensions($size,$xsrcsize,$ysrcsize) {
  // Get the dimensions based on one size setting - so that portrait and
  // landscape images are to the same scale

  if ( $xsrcsize > $ysrcsize ){
    // this must be a landscape format image
    // Check that the original is bigger than the requested size
    // we don't want to enlarge a small original photo.
    if ( $size < $xsrcsize ) {
      $dest_x = $size ;
      $dest_y = ($dest_x/$xsrcsize)*$ysrcsize ;
    } else {
      $dest_x = $xsrcsize ;
      $dest_y = $ysrcsize ;
    }
  } else {
    // otherwise it is a portrait format
    // Check that the original is bigger than the requested size
    // we don't want to enlarge a small original photo.
    if ( $size < $ysrcsize ) {
      $dest_y = $size ;
      $dest_x = ($dest_y/$ysrcsize)*$xsrcsize ;
    } else {
      $dest_x = $xsrcsize ;
      $dest_y = $ysrcsize ;
    }
  }

  $array = array($dest_x, $dest_y) ;
  return $array;
}
?>