PHP MediaHandler::doTransform方法代码示例

 /**
  * Transform a media file
  *
  * @param $params Array: an associative array of handler-specific parameters.
  *                Typical keys are width, height and page.
  * @param $flags Integer: a bitfield, may contain self::RENDER_NOW to force rendering
  * @return MediaTransformOutput|false
  */
 function transform($params, $flags = 0)
 {
     global $wgUseSquid, $wgIgnoreImageErrors, $wgThumbnailEpoch;
     wfProfileIn(__METHOD__);
     do {
         if (!$this->canRender()) {
             $thumb = $this->iconThumb();
             break;
             // not a bitmap or renderable image, don't try
         }
         // Get the descriptionUrl to embed it as comment into the thumbnail. Bug 19791.
         $descriptionUrl = $this->getDescriptionUrl();
         if ($descriptionUrl) {
             $params['descriptionUrl'] = wfExpandUrl($descriptionUrl, PROTO_CANONICAL);
         }
         $script = $this->getTransformScript();
         if ($script && !($flags & self::RENDER_NOW)) {
             // Use a script to transform on client request, if possible
             $thumb = $this->handler->getScriptedTransform($this, $script, $params);
             if ($thumb) {
                 break;
             }
         }
         $normalisedParams = $params;
         $this->handler->normaliseParams($this, $normalisedParams);
         $thumbName = $this->thumbName($normalisedParams);
         $thumbUrl = $this->getThumbUrl($thumbName);
         $thumbPath = $this->getThumbPath($thumbName);
         // final thumb path
         if ($this->repo) {
             // Defer rendering if a 404 handler is set up...
             if ($this->repo->canTransformVia404() && !($flags & self::RENDER_NOW)) {
                 wfDebug(__METHOD__ . " transformation deferred.");
                 // XXX: Pass in the storage path even though we are not rendering anything
                 // and the path is supposed to be an FS path. This is due to getScalerType()
                 // getting called on the path and clobbering $thumb->getUrl() if it's false.
                 $thumb = $this->handler->getTransform($this, $thumbPath, $thumbUrl, $params);
                 break;
             }
             // Clean up broken thumbnails as needed
             $this->migrateThumbFile($thumbName);
             // Check if an up-to-date thumbnail already exists...
             wfDebug(__METHOD__ . ": Doing stat for {$thumbPath}\n");
             if ($this->repo->fileExists($thumbPath) && !($flags & self::RENDER_FORCE)) {
                 $timestamp = $this->repo->getFileTimestamp($thumbPath);
                 if ($timestamp !== false && $timestamp >= $wgThumbnailEpoch) {
                     // XXX: Pass in the storage path even though we are not rendering anything
                     // and the path is supposed to be an FS path. This is due to getScalerType()
                     // getting called on the path and clobbering $thumb->getUrl() if it's false.
                     $thumb = $this->handler->getTransform($this, $thumbPath, $thumbUrl, $params);
                     $thumb->setStoragePath($thumbPath);
                     break;
                 }
             } elseif ($flags & self::RENDER_FORCE) {
                 wfDebug(__METHOD__ . " forcing rendering per flag File::RENDER_FORCE\n");
             }
         }
         // Create a temp FS file with the same extension and the thumbnail
         $thumbExt = FileBackend::extensionFromPath($thumbPath);
         $tmpFile = TempFSFile::factory('transform_', $thumbExt);
         if (!$tmpFile) {
             $thumb = $this->transformErrorOutput($thumbPath, $thumbUrl, $params, $flags);
             break;
         }
         $tmpThumbPath = $tmpFile->getPath();
         // path of 0-byte temp file
         // Actually render the thumbnail...
         $thumb = $this->handler->doTransform($this, $tmpThumbPath, $thumbUrl, $params);
         $tmpFile->bind($thumb);
         // keep alive with $thumb
         if (!$thumb) {
             // bad params?
             $thumb = null;
         } elseif ($thumb->isError()) {
             // transform error
             $this->lastError = $thumb->toText();
             // Ignore errors if requested
             if ($wgIgnoreImageErrors && !($flags & self::RENDER_NOW)) {
                 $thumb = $this->handler->getTransform($this, $tmpThumbPath, $thumbUrl, $params);
             }
         } elseif ($this->repo && $thumb->hasFile() && !$thumb->fileIsSource()) {
             $backend = $this->repo->getBackend();
             // Copy the thumbnail from the file system into storage. This avoids using
             // FileRepo::store(); getThumbPath() uses a different zone in some subclasses.
             $backend->prepare(array('dir' => dirname($thumbPath)));
             $status = $backend->store(array('src' => $tmpThumbPath, 'dst' => $thumbPath, 'overwrite' => 1), array('force' => 1, 'nonLocking' => 1, 'allowStale' => 1));
             if ($status->isOK()) {
                 $thumb->setStoragePath($thumbPath);
             } else {
                 $thumb = $this->transformErrorOutput($thumbPath, $thumbUrl, $params, $flags);
             }
         }
//.........这里部分代码省略.........

 /**
  * Transform a media file
  *
  * @param $params Array: an associative array of handler-specific parameters.
  *                Typical keys are width, height and page.
  * @param $flags Integer: a bitfield, may contain self::RENDER_NOW to force rendering
  * @return MediaTransformOutput | false
  */
 function transform($params, $flags = 0)
 {
     global $wgUseSquid, $wgIgnoreImageErrors, $wgThumbnailEpoch, $wgServer;
     wfProfileIn(__METHOD__);
     do {
         if (!$this->canRender()) {
             // not a bitmap or renderable image, don't try.
             $thumb = $this->iconThumb();
             break;
         }
         // Get the descriptionUrl to embed it as comment into the thumbnail. Bug 19791.
         $descriptionUrl = $this->getDescriptionUrl();
         if ($descriptionUrl) {
             $params['descriptionUrl'] = wfExpandUrl($descriptionUrl, PROTO_CANONICAL);
         }
         $script = $this->getTransformScript();
         if ($script && !($flags & self::RENDER_NOW)) {
             // Use a script to transform on client request, if possible
             $thumb = $this->handler->getScriptedTransform($this, $script, $params);
             if ($thumb) {
                 break;
             }
         }
         $normalisedParams = $params;
         $this->handler->normaliseParams($this, $normalisedParams);
         $thumbName = $this->thumbName($normalisedParams);
         $thumbPath = $this->getThumbPath($thumbName);
         $thumbUrl = $this->getThumbUrl($thumbName);
         if ($this->repo && $this->repo->canTransformVia404() && !($flags & self::RENDER_NOW)) {
             $thumb = $this->handler->getTransform($this, $thumbPath, $thumbUrl, $params);
             break;
         }
         wfDebug(__METHOD__ . ": Doing stat for {$thumbPath}\n");
         $this->migrateThumbFile($thumbName);
         if (file_exists($thumbPath)) {
             $thumbTime = filemtime($thumbPath);
             if ($thumbTime !== FALSE && gmdate('YmdHis', $thumbTime) >= $wgThumbnailEpoch) {
                 $thumb = $this->handler->getTransform($this, $thumbPath, $thumbUrl, $params);
                 break;
             }
         }
         $thumb = $this->handler->doTransform($this, $thumbPath, $thumbUrl, $params);
         // Ignore errors if requested
         if (!$thumb) {
             $thumb = null;
         } elseif ($thumb->isError()) {
             $this->lastError = $thumb->toText();
             if ($wgIgnoreImageErrors && !($flags & self::RENDER_NOW)) {
                 $thumb = $this->handler->getTransform($this, $thumbPath, $thumbUrl, $params);
             }
         }
         // Purge. Useful in the event of Core -> Squid connection failure or squid
         // purge collisions from elsewhere during failure. Don't keep triggering for
         // "thumbs" which have the main image URL though (bug 13776)
         if ($wgUseSquid && (!$thumb || $thumb->isError() || $thumb->getUrl() != $this->getURL())) {
             SquidUpdate::purge(array($thumbUrl));
         }
     } while (false);
     wfProfileOut(__METHOD__);
     return is_object($thumb) ? $thumb : false;
 }