From d246d8eb9563661d9cfe52a2dd87414bd2e10a5f Mon Sep 17 00:00:00 2001
From: dirk <dirk@git.imagemagick.org>
Date: Fri, 9 Aug 2013 21:14:11 +0000
Subject: [PATCH] Added alphaChannel to Magick++.

---
 Magick++/lib/Image.cpp          | 10 ++++++++++
 Magick++/lib/Magick++/Image.h   |  4 ++++
 Magick++/lib/Magick++/Include.h | 14 ++++++++++++++
 3 files changed, 28 insertions(+)

diff --git a/Magick++/lib/Image.cpp b/Magick++/lib/Image.cpp
index 647fbe933..a9bc76653 100644
--- a/Magick++/lib/Image.cpp
+++ b/Magick++/lib/Image.cpp
@@ -434,6 +434,16 @@ void Magick::Image::alpha ( const unsigned int alpha_ )
   (void) DestroyExceptionInfo( &exceptionInfo );
 }
 
+void Magick::Image::alphaChannel ( AlphaChannelOption alphaOption_ )
+{
+  modifyImage();
+  ExceptionInfo exceptionInfo;
+  GetExceptionInfo( &exceptionInfo );
+  SetImageAlphaChannel( image(), alphaOption_, &exceptionInfo );
+  throwException( exceptionInfo );
+  (void) DestroyExceptionInfo( &exceptionInfo );
+}
+
 // Annotate using specified text, and placement location
 void Magick::Image::annotate ( const std::string &text_,
                                const Geometry &location_ )
diff --git a/Magick++/lib/Magick++/Image.h b/Magick++/lib/Magick++/Image.h
index 2515a601e..206c46c7a 100644
--- a/Magick++/lib/Magick++/Image.h
+++ b/Magick++/lib/Magick++/Image.h
@@ -154,6 +154,10 @@ namespace Magick
     // transparent, respectively.
     void            alpha ( const unsigned int alpha_ );
 
+    // AlphaChannel() activates, deactivates, resets, or sets the alpha
+    // channel.
+    void            alphaChannel ( AlphaChannelOption alphaOption_ );
+
     //
     // Annotate image (draw text on image)
     //
diff --git a/Magick++/lib/Magick++/Include.h b/Magick++/lib/Magick++/Include.h
index 69c1d24b0..1a8e08af4 100644
--- a/Magick++/lib/Magick++/Include.h
+++ b/Magick++/lib/Magick++/Include.h
@@ -231,6 +231,20 @@ namespace Magick
   using MagickCore::MagickFalse;
   using MagickCore::MagickTrue;
 
+  // Alpha channel options
+  using MagickCore::AlphaChannelOption;
+  using MagickCore::UndefinedAlphaChannel;
+  using MagickCore::ActivateAlphaChannel;
+  using MagickCore::BackgroundAlphaChannel;
+  using MagickCore::CopyAlphaChannel;
+  using MagickCore::DeactivateAlphaChannel;
+  using MagickCore::ExtractAlphaChannel;
+  using MagickCore::OpaqueAlphaChannel;
+  using MagickCore::RemoveAlphaChannel;
+  using MagickCore::SetAlphaChannel;
+  using MagickCore::ShapeAlphaChannel;
+  using MagickCore::TransparentAlphaChannel;
+
   // Image class types
   using MagickCore::ClassType;
   using MagickCore::UndefinedClass;
-- 
2.49.0