fixed problem with the applying PDF page orientation for the GhostscriptViewer and the GhostscriptRasterizer

Author: jhabjan

Ghostscript.NET/Ghostscript.NET.csproj

@@ -89,6 +89,7 @@
     <Compile Include="GhostscriptDisplayDeviceHandler.cs" />
     <Compile Include="GhostscriptLibrary.cs" />
     <Compile Include="GhostscriptLicense.cs" />
+    <Compile Include="GhostscriptPageOrientation.cs" />
     <Compile Include="GhostscriptPdfInfo.cs" />
     <Compile Include="GhostscriptPipedOutput.cs" />
     <Compile Include="GhostscriptRectangle.cs" />

Ghostscript.NET/GhostscriptPageOrientation.cs

@@ -0,0 +1,38 @@
+//
+// GhostscriptPageOrientation.cs
+// This file is part of Ghostscript.NET library
+//
+// Author: Josip Habjan (habjan@gmail.com, http://www.linkedin.com/in/habjan) 
+// Copyright (c) 2013-2014 by Josip Habjan. All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+using System;
+
+namespace Ghostscript.NET
+{
+    public enum GhostscriptPageOrientation : int
+    {
+        Portrait = 0,
+        Seascape = 1,
+        UpsideDown = 2,
+        Landscape = 3
+    }
+}

Ghostscript.NET/Viewer/FormatHandlers/GhostscriptViewerPdfFormatHandler.cs

@@ -163,6 +163,33 @@ public override void StdOutput(string message)
                         }
                     case PDF_ROTATE_TAG:
                         {
+                            int rotate = int.Parse(rest);
+
+                            while (rotate < 0)
+                            {
+                                rotate += 360;
+                            }
+
+                            while (rotate >= 360)
+                            {
+                                rotate -= 360;
+                            }
+                                
+                            switch (rotate)
+                            {
+                                case 90:
+                                    this.PageOrientation = GhostscriptPageOrientation.Landscape;
+                                    break;
+                                case 180:
+                                    this.PageOrientation = GhostscriptPageOrientation.UpsideDown;
+                                    break;
+                                case 270:
+                                    this.PageOrientation = GhostscriptPageOrientation.Seascape;
+                                    break;
+                                default:
+                                    this.PageOrientation = GhostscriptPageOrientation.Portrait;
+                                    break;
+                            }
 
                             break;
                         }

Ghostscript.NET/Viewer/GhostscriptViewer.cs

@@ -503,6 +503,8 @@ public void ShowPage(int pageNumber, bool refresh)
             this.Interpreter.Run(string.Format("/GraphicsAlphaBits {0}\n", _graphicsAlphaBits));
             this.Interpreter.Run(string.Format("/TextAlphaBits {0}\n", _textAlphaBits));
 
+            this.Interpreter.Run(string.Format("/Orientation {0}\n", (int)this.CurrentPageOrientation));
+
             this.Interpreter.Run(">> setpagedevice\n");
 
             this.Interpreter.Run(
@@ -984,6 +986,25 @@ public bool EPSClip
 
         #endregion
 
+        #region CurrentPageOrientation
+
+        public GhostscriptPageOrientation CurrentPageOrientation
+        {
+            get
+            {
+                if (this.IsEverythingInitialized)
+                {
+                    return _formatHandler.PageOrientation;
+                }
+                else
+                {
+                    return GhostscriptPageOrientation.Landscape;
+                }
+            }
+        }
+
+        #endregion
+
         #endregion
 
         #region Internal properties

Ghostscript.NET/Viewer/GhostscriptViewerFormatHandler.cs

@@ -42,6 +42,7 @@ internal abstract class GhostscriptViewerFormatHandler : IDisposable
         private GhostscriptRectangle _mediaBox = GhostscriptRectangle.Empty;
         private GhostscriptRectangle _boundingBox = GhostscriptRectangle.Empty;
         private GhostscriptRectangle _cropBox = GhostscriptRectangle.Empty;
+        private GhostscriptPageOrientation _pageOrientation = GhostscriptPageOrientation.Portrait;
         private bool _showPagePostScriptCommandInvoked = false;
 
         #endregion
@@ -212,6 +213,16 @@ public bool IsCropBoxSet
 
         #endregion
 
+        #region PageOrientation
+
+        public GhostscriptPageOrientation PageOrientation
+        {
+            get { return _pageOrientation; }
+            set { _pageOrientation = value; }
+        }
+
+        #endregion
+
         #region ShowPageInvoked
 
         internal bool ShowPagePostScriptCommandInvoked