From cb6c4483e9312c68e95bf3004f3c05e384c21cc9 Mon Sep 17 00:00:00 2001
From: Marcello Bastea-Forte <marcello@marcello-dev.local>
Date: Sat, 9 Apr 2011 12:02:06 -0400
Subject: [PATCH] make PNGStream a real Stream (so stream.pipe(dest) works)

Signed-off-by: Tj Holowaychuk <tj@vision-media.ca>
---
 lib/pngstream.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/pngstream.js b/lib/pngstream.js
index 2f3ecf6..cb5461d 100644
--- a/lib/pngstream.js
+++ b/lib/pngstream.js
@@ -9,7 +9,7 @@
  * Module dependencies.
  */
 
-var EventEmitter = require('events').EventEmitter;
+var Stream = require('stream').Stream;
 
 /**
  * Initialize a `PNGStream` with the given `canvas`.
@@ -41,16 +41,19 @@ var PNGStream = module.exports = function PNGStream(canvas, sync) {
       : 'streamPNG';
   this.sync = sync;
   this.canvas = canvas;
+  this.readable = true;
   // TODO: implement async
   if ('streamPNG' == method) method = 'streamPNGSync';
   process.nextTick(function(){
     canvas[method](function(err, chunk, len){
       if (err) {
         self.emit('error', err);
+        self.readable = false;
       } else if (len) {
         self.emit('data', chunk, len);
       } else {
         self.emit('end');
+        self.readable = false;
       }
     });
   });
@@ -60,4 +63,4 @@ var PNGStream = module.exports = function PNGStream(canvas, sync) {
  * Inherit from `EventEmitter`.
  */
 
-PNGStream.prototype.__proto__ = EventEmitter.prototype;
\ No newline at end of file
+PNGStream.prototype.__proto__ = Stream.prototype;
\ No newline at end of file