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hm_sunwell/node_modules/canvas/lib/jpegstream.js

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+'use strict';
+
+/*!
+ * Canvas - JPEGStream
+ * Copyright (c) 2010 LearnBoost <tj@learnboost.com>
+ * MIT Licensed
+ */
+
+/**
+ * Module dependencies.
+ */
+
+var Stream = require('stream').Stream;
+
+/**
+ * Initialize a `JPEGStream` with the given `canvas`.
+ *
+ * "data" events are emitted with `Buffer` chunks, once complete the
+ * "end" event is emitted. The following example will stream to a file
+ * named "./my.jpeg".
+ *
+ *     var out = fs.createWriteStream(__dirname + '/my.jpeg')
+ *       , stream = canvas.createJPEGStream();
+ *
+ *     stream.pipe(out);
+ *
+ * @param {Canvas} canvas
+ * @param {Boolean} sync
+ * @api public
+ */
+
+var JPEGStream = module.exports = function JPEGStream(canvas, options, sync) {
+  var self = this
+    , method = sync
+      ? 'streamJPEGSync'
+      : 'streamJPEG';
+  this.options = options;
+  this.sync = sync;
+  this.canvas = canvas;
+  this.readable = true;
+  // TODO: implement async
+  if ('streamJPEG' == method) method = 'streamJPEGSync';
+  process.nextTick(function(){
+    canvas[method](options.bufsize, options.quality, options.progressive, function(err, chunk){
+      if (err) {
+        self.emit('error', err);
+        self.readable = false;
+      } else if (chunk) {
+        self.emit('data', chunk);
+      } else {
+        self.emit('end');
+        self.readable = false;
+      }
+    });
+  });
+};
+
+/**
+ * Inherit from `EventEmitter`.
+ */
+
+JPEGStream.prototype.__proto__ = Stream.prototype;