From c1180d1f3d0c13704ed4406cbc341fe1f90b280f Mon Sep 17 00:00:00 2001
From: Robert Coup <robert@coup.net.nz>
Date: Wed, 27 Nov 2013 15:39:15 +1300
Subject: [PATCH] Add CAIRO_FORMAT_INVALID

Fixes https://github.com/LearnBoost/node-canvas/issues/342
---
 src/PNG.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/PNG.h b/src/PNG.h
index ed6d198..d3ba4f1 100644
--- a/src/PNG.h
+++ b/src/PNG.h
@@ -15,6 +15,10 @@
 #define unlikely(expr) (expr)
 #endif
 
+#ifndef CAIRO_FORMAT_INVALID
+#define CAIRO_FORMAT_INVALID -1
+#endif
+
 static void canvas_png_flush(png_structp png_ptr) {
     /* Do nothing; fflush() is said to be just a waste of energy. */
     (void) png_ptr;   /* Stifle compiler warning */