moved crop/resize functions out of fetch.php for reusability

darcs-hash:20081026135833-23886-a9c8e910571c6e7a4e1603a2ebd365b3ed37108a.gz

1 files changed, 305 insertions, 0 deletions

diff --git a/inc/media.php b/inc/media.php
index 0da8a8578..3e54db512 100644
--- a/inc/media.php
+++ b/inc/media.php
@@ -721,3 +721,308 @@ function media_nstree_li($item){
     return '<li class="'.$class.'">'.
            '<img src="'.$img.'" alt="'.$alt.'" />';
 }
+
+/**
+ * Resizes the given image to the given size
+ *
+ * @author  Andreas Gohr <andi@splitbrain.org>
+ */
+function media_resize_image($file, $ext, $w, $h=0){
+  global $conf;
+
+  $info = @getimagesize($file); //get original size
+  if($info == false) return $file; // that's no image - it's a spaceship!
+
+  if(!$h) $h = round(($w * $info[1]) / $info[0]);
+
+  // we wont scale up to infinity
+  if($w > 2000 || $h > 2000) return $file;
+
+  //cache
+  $local = getCacheName($file,'.media.'.$w.'x'.$h.'.'.$ext);
+  $mtime = @filemtime($local); // 0 if not exists
+
+  if( $mtime > filemtime($file) ||
+      media_resize_imageIM($ext,$file,$info[0],$info[1],$local,$w,$h) ||
+      media_resize_imageGD($ext,$file,$info[0],$info[1],$local,$w,$h) ){
+    if($conf['fperm']) chmod($local, $conf['fperm']);
+    return $local;
+  }
+  //still here? resizing failed
+  return $file;
+}
+
+/**
+ * Crops the given image to the wanted ratio, then calls media_resize_image to scale it
+ * to the wanted size
+ *
+ * Crops are centered horizontally but prefer the upper third of an vertical
+ * image because most pics are more interesting in that area (rule of thirds)
+ *
+ * @author  Andreas Gohr <andi@splitbrain.org>
+ */
+function media_crop_image($file, $ext, $w, $h=0){
+  global $conf;
+
+  if(!$h) $h = $w;
+  $info = @getimagesize($file); //get original size
+  if($info == false) return $file; // that's no image - it's a spaceship!
+
+  // calculate crop size
+  $fr = $info[0]/$info[1];
+  $tr = $w/$h;
+  if($tr >= 1){
+    if($tr > $fr){
+        $cw = $info[0];
+        $ch = (int) $info[0]/$tr;
+    }else{
+        $cw = (int) $info[1]*$tr;
+        $ch = $info[1];
+    }
+  }else{
+    if($tr < $fr){
+        $cw = (int) $info[1]*$tr;
+        $ch = $info[1];
+    }else{
+        $cw = $info[0];
+        $ch = (int) $info[0]/$tr;
+    }
+  }
+  // calculate crop offset
+  $cx = (int) ($info[0]-$cw)/2;
+  $cy = (int) ($info[1]-$ch)/3;
+
+  //cache
+  $local = getCacheName($file,'.media.'.$cw.'x'.$ch.'.crop.'.$ext);
+  $mtime = @filemtime($local); // 0 if not exists
+
+  if( $mtime > filemtime($file) ||
+      media_crop_imageIM($ext,$file,$info[0],$info[1],$local,$cw,$ch,$cx,$cy) ||
+      media_resize_imageGD($ext,$file,$cw,$ch,$local,$cw,$ch,$cx,$cy) ){
+    if($conf['fperm']) chmod($local, $conf['fperm']);
+    return media_resize_image($local,$ext, $w, $h);
+  }
+
+  //still here? cropping failed
+  return media_resize_image($file,$ext, $w, $h);
+}
+
+/**
+ * Download a remote file and return local filename
+ *
+ * returns false if download fails. Uses cached file if available and
+ * wanted
+ *
+ * @author  Andreas Gohr <andi@splitbrain.org>
+ * @author  Pavel Vitis <Pavel.Vitis@seznam.cz>
+ */
+function media_get_from_URL($url,$ext,$cache){
+  global $conf;
+
+  // if no cache or fetchsize just redirect
+  if ($cache==0)           return false;
+  if (!$conf['fetchsize']) return false;
+
+  $local = getCacheName(strtolower($url),".media.$ext");
+  $mtime = @filemtime($local); // 0 if not exists
+
+  //decide if download needed:
+  if( ($mtime == 0) ||                           // cache does not exist
+      ($cache != -1 && $mtime < time()-$cache)   // 'recache' and cache has expired
+    ){
+      if(media_image_download($url,$local)){
+        return $local;
+      }else{
+        return false;
+      }
+  }
+
+  //if cache exists use it else
+  if($mtime) return $local;
+
+  //else return false
+  return false;
+}
+
+/**
+ * Download image files
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function media_image_download($url,$file){
+  global $conf;
+  $http = new DokuHTTPClient();
+  $http->max_bodysize = $conf['fetchsize'];
+  $http->timeout = 25; //max. 25 sec
+  $http->header_regexp = '!\r\nContent-Type: image/(jpe?g|gif|png)!i';
+
+  $data = $http->get($url);
+  if(!$data) return false;
+
+  $fileexists = @file_exists($file);
+  $fp = @fopen($file,"w");
+  if(!$fp) return false;
+  fwrite($fp,$data);
+  fclose($fp);
+  if(!$fileexists and $conf['fperm']) chmod($file, $conf['fperm']);
+
+  // check if it is really an image
+  $info = @getimagesize($file);
+  if(!$info){
+    @unlink($file);
+    return false;
+  }
+
+  return true;
+}
+
+/**
+ * resize images using external ImageMagick convert program
+ *
+ * @author Pavel Vitis <Pavel.Vitis@seznam.cz>
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function media_resize_imageIM($ext,$from,$from_w,$from_h,$to,$to_w,$to_h){
+  global $conf;
+
+  // check if convert is configured
+  if(!$conf['im_convert']) return false;
+
+  // prepare command
+  $cmd  = $conf['im_convert'];
+  $cmd .= ' -resize '.$to_w.'x'.$to_h.'!';
+  if ($ext == 'jpg' || $ext == 'jpeg') {
+      $cmd .= ' -quality '.$conf['jpg_quality'];
+  }
+  $cmd .= " $from $to";
+
+  @exec($cmd,$out,$retval);
+  if ($retval == 0) return true;
+  return false;
+}
+
+/**
+ * crop images using external ImageMagick convert program
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function media_crop_imageIM($ext,$from,$from_w,$from_h,$to,$to_w,$to_h,$ofs_x,$ofs_y){
+  global $conf;
+
+  // check if convert is configured
+  if(!$conf['im_convert']) return false;
+
+  // prepare command
+  $cmd  = $conf['im_convert'];
+  $cmd .= ' -crop '.$to_w.'x'.$to_h.'+'.$ofs_x.'+'.$ofs_y;
+  if ($ext == 'jpg' || $ext == 'jpeg') {
+      $cmd .= ' -quality '.$conf['jpg_quality'];
+  }
+  $cmd .= " $from $to";
+
+  @exec($cmd,$out,$retval);
+  if ($retval == 0) return true;
+  return false;
+}
+
+/**
+ * resize or crop images using PHP's libGD support
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ * @author Sebastian Wienecke <s_wienecke@web.de>
+ */
+function media_resize_imageGD($ext,$from,$from_w,$from_h,$to,$to_w,$to_h,$ofs_x=0,$ofs_y=0){
+  global $conf;
+
+  if($conf['gdlib'] < 1) return false; //no GDlib available or wanted
+
+  // check available memory
+  if(!is_mem_available(($from_w * $from_h * 4) + ($to_w * $to_h * 4))){
+    return false;
+  }
+
+  // create an image of the given filetype
+  if ($ext == 'jpg' || $ext == 'jpeg'){
+    if(!function_exists("imagecreatefromjpeg")) return false;
+    $image = @imagecreatefromjpeg($from);
+  }elseif($ext == 'png') {
+    if(!function_exists("imagecreatefrompng")) return false;
+    $image = @imagecreatefrompng($from);
+
+  }elseif($ext == 'gif') {
+    if(!function_exists("imagecreatefromgif")) return false;
+    $image = @imagecreatefromgif($from);
+  }
+  if(!$image) return false;
+
+  if(($conf['gdlib']>1) && function_exists("imagecreatetruecolor") && $ext != 'gif'){
+    $newimg = @imagecreatetruecolor ($to_w, $to_h);
+  }
+  if(!$newimg) $newimg = @imagecreate($to_w, $to_h);
+  if(!$newimg){
+    imagedestroy($image);
+    return false;
+  }
+
+  //keep png alpha channel if possible
+  if($ext == 'png' && $conf['gdlib']>1 && function_exists('imagesavealpha')){
+    imagealphablending($newimg, false);
+    imagesavealpha($newimg,true);
+  }
+
+  //keep gif transparent color if possible
+  if($ext == 'gif' && function_exists('imagefill') && function_exists('imagecolorallocate')) {
+    if(function_exists('imagecolorsforindex') && function_exists('imagecolortransparent')) {
+      $transcolorindex = @imagecolortransparent($image);
+      if($transcolorindex >= 0 ) { //transparent color exists
+        $transcolor = @imagecolorsforindex($image, $transcolorindex);
+        $transcolorindex = @imagecolorallocate($newimg, $transcolor['red'], $transcolor['green'], $transcolor['blue']);
+        @imagefill($newimg, 0, 0, $transcolorindex);
+        @imagecolortransparent($newimg, $transcolorindex);
+      }else{ //filling with white
+        $whitecolorindex = @imagecolorallocate($newimg, 255, 255, 255);
+        @imagefill($newimg, 0, 0, $whitecolorindex);
+      }
+    }else{ //filling with white
+      $whitecolorindex = @imagecolorallocate($newimg, 255, 255, 255);
+      @imagefill($newimg, 0, 0, $whitecolorindex);
+    }
+  }
+
+  //try resampling first
+  if(function_exists("imagecopyresampled")){
+    if(!@imagecopyresampled($newimg, $image, 0, 0, $ofs_x, $ofs_y, $to_w, $to_h, $from_w, $from_h)) {
+      imagecopyresized($newimg, $image, 0, 0, $ofs_x, $ofs_y, $to_w, $to_h, $from_w, $from_h);
+    }
+  }else{
+    imagecopyresized($newimg, $image, 0, 0, $ofs_x, $ofs_y, $to_w, $to_h, $from_w, $from_h);
+  }
+
+  $okay = false;
+  if ($ext == 'jpg' || $ext == 'jpeg'){
+    if(!function_exists('imagejpeg')){
+      $okay = false;
+    }else{
+      $okay = imagejpeg($newimg, $to, $conf['jpg_quality']);
+    }
+  }elseif($ext == 'png') {
+    if(!function_exists('imagepng')){
+      $okay = false;
+    }else{
+      $okay =  imagepng($newimg, $to);
+    }
+  }elseif($ext == 'gif') {
+    if(!function_exists('imagegif')){
+      $okay = false;
+    }else{
+      $okay = imagegif($newimg, $to);
+    }
+  }
+
+  // destroy GD image ressources
+  if($image) imagedestroy($image);
+  if($newimg) imagedestroy($newimg);
+
+  return $okay;
+}
+