References:
https://bugzilla.mozilla.org/show_bug.cgi?id=403675
https://bugzilla.mozilla.org/show_bug.cgi?id=386362

Index: modules/libpr0n/encoders/png/nsPNGEncoder.h
===================================================================
RCS file: /cvsroot/mozilla/modules/libpr0n/encoders/png/nsPNGEncoder.h,v
retrieving revision 1.1.18.1
diff -u -p -6 -r1.1.18.1 nsPNGEncoder.h
--- modules/libpr0n/encoders/png/nsPNGEncoder.h	20 May 2006 17:20:49 -0000	1.1.18.1
+++ modules/libpr0n/encoders/png/nsPNGEncoder.h	13 Nov 2007 22:07:36 -0000
@@ -35,14 +35,16 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
 #include "imgIEncoder.h"
 #ifdef MOZILLA_1_8_BRANCH
 #define imgIEncoder imgIEncoder_MOZILLA_1_8_BRANCH
+#ifndef NS_DECL_IMGIENCODER
 #define NS_DECL_IMGIENCODER NS_DECL_IMGIENCODER_MOZILLA_1_8_BRANCH
 #endif
+#endif
 
 #include <png.h>
 
 #define NS_PNGENCODER_CID \
 { /* 38d1592e-b81e-432b-86f8-471878bbfe07 */         \
      0x38d1592e,                                     \
@@ -60,12 +62,20 @@ public:
   NS_DECL_ISUPPORTS
   NS_DECL_IMGIENCODER
   NS_DECL_NSIINPUTSTREAM
 
   nsPNGEncoder();
 
+  NS_IMETHOD InitFromData(const PRUint8* aData,
+                          PRUint32 aLength, // (unused, req'd by JS)
+                          PRUint32 aWidth,
+                          PRUint32 aHeight,
+                          PRUint32 aStride,
+                          PRUint32 aInputFormat,
+                          const nsAString& aOutputOptions);
+
 private:
   ~nsPNGEncoder();
 
 protected:
   void ConvertHostARGBRow(const PRUint8* aSrc, PRUint8* aDest,
                           PRUint32 aPixelWidth, PRBool aUseTransparency);
Index: modules/libpr0n/encoders/jpeg/nsJPEGEncoder.h
===================================================================
RCS file: /cvsroot/mozilla/modules/libpr0n/encoders/jpeg/nsJPEGEncoder.h,v
retrieving revision 1.1.14.1
diff -u -p -6 -r1.1.14.1 nsJPEGEncoder.h
--- modules/libpr0n/encoders/jpeg/nsJPEGEncoder.h	20 May 2006 17:20:48 -0000	1.1.14.1
+++ modules/libpr0n/encoders/jpeg/nsJPEGEncoder.h	13 Nov 2007 22:07:57 -0000
@@ -36,14 +36,16 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
 #include "imgIEncoder.h"
 #ifdef MOZILLA_1_8_BRANCH
 #define imgIEncoder imgIEncoder_MOZILLA_1_8_BRANCH
+#ifndef NS_DECL_IMGIENCODER
 #define NS_DECL_IMGIENCODER NS_DECL_IMGIENCODER_MOZILLA_1_8_BRANCH
 #endif
+#endif
 
 // needed for JPEG library
 #include <stdio.h>
 
 extern "C" {
 #include "jpeglib.h"
@@ -66,12 +68,20 @@ public:
   NS_DECL_ISUPPORTS
   NS_DECL_IMGIENCODER
   NS_DECL_NSIINPUTSTREAM
 
   nsJPEGEncoder();
 
+  NS_IMETHOD InitFromData(const PRUint8* aData,
+                          PRUint32 aLength, // (unused, req'd by JS)
+                          PRUint32 aWidth,
+                          PRUint32 aHeight,
+                          PRUint32 aStride,
+                          PRUint32 aInputFormat,
+                          const nsAString& aOutputOptions);
+
 private:
   ~nsJPEGEncoder();
 
 protected:
 
   void ConvertHostARGBRow(const PRUint8* aSrc, PRUint8* aDest,
Index: modules/libpr0n/public/imgIEncoder.idl
===================================================================
RCS file: /cvsroot/mozilla/modules/libpr0n/public/imgIEncoder.idl,v
retrieving revision 1.1.10.3
diff -u -p -r1.1.10.3 imgIEncoder.idl
--- modules/libpr0n/public/imgIEncoder.idl	20 May 2006 17:20:49 -0000	1.1.10.3
+++ modules/libpr0n/public/imgIEncoder.idl	14 Nov 2007 10:41:40 -0000
@@ -96,6 +96,6 @@ interface nsIFile;
 [scriptable, uuid(CCC5B3AD-3E67-4e3d-97E1-B06B2E96FEF8)]
 interface imgIEncoder : nsISupports
 {
-  void encodeClipboardImage(in nsIClipboardImage aClipboardImage, out nsIFile aImageFile);
+  /* void encodeClipboardImage(in nsIClipboardImage aClipboardImage, out nsIFile aImageFile); */
 };