0023272: Image comparison algorithm

A new class Image_Diff for comparison of images
and a draw-command "diffimage", which compares 2 images.

Image_PixMap redesigned to provide interface for low-level image operations.
New Image_AlienPixMap class now intended for Save/Load functionality.

Aspect_PixMap class dropped.
Xw_PixMap and WNT_PixMap classes now do not inherit from Aspect_PixMap and deprecated.

ToPixMap methods now retrieve Image_PixMap as argument.

Conflicts:
src/ViewerTest/ViewerTest.cxx
Remarks applied
Fix compilation (correct merging error)

Eliminated Aspect <-> Image cyclic dependency

Fixed GIF dump in case of BGR32 image format

src/Graphic3d/FILES

@@ -53,3 +53,4 @@ Graphic3d_AspectText3d.cxx
 Graphic3d_WNTGraphicDevice.cxx
 Graphic3d_NameOfFont.hxx
 Graphic3d_PtrFrameBuffer.hxx
+Graphic3d_BufferType.hxx

src/Graphic3d/Graphic3d.cdl

@@ -329,6 +329,7 @@ is
     ---------------------------
 
     imported PrimitiveArray;
+    imported BufferType;
 
     imported CBitFields20;
     ---Purpose: Defines the C structure

src/Graphic3d/Graphic3d_BufferType.hxx

@@ -0,0 +1,29 @@
+// Copyright (c) 2012 OPEN CASCADE SAS
+//
+// The content of this file is subject to the Open CASCADE Technology Public
+// License Version 6.5 (the "License"). You may not use the content of this file
+// except in compliance with the License. Please obtain a copy of the License
+// at http://www.opencascade.org and read it completely before using this file.
+//
+// The Initial Developer of the Original Code is Open CASCADE S.A.S., having its
+// main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France.
+//
+// The Original Code and all software distributed under the License is
+// distributed on an "AS IS" basis, without warranty of any kind, and the
+// Initial Developer hereby disclaims all such warranties, including without
+// limitation, any warranties of merchantability, fitness for a particular
+// purpose or non-infringement. Please see the License for the specific terms
+// and conditions governing the rights and limitations under the License.
+
+#ifndef _Graphic3d_BufferType_H__
+#define _Graphic3d_BufferType_H__
+
+//! Define buffers available for dump
+typedef enum
+{
+  Graphic3d_BT_RGB,   //!< color buffer without alpha component
+  Graphic3d_BT_RGBA,  //!< color buffer
+  Graphic3d_BT_Depth  //!< depth buffer
+} Graphic3d_BufferType;
+
+#endif // _Graphic3d_BufferType_H__

src/Graphic3d/Graphic3d_GraphicDriver.cdl

@@ -71,6 +71,7 @@ uses
     PlaneAngle          from Quantity,
 
     AlienImage          from AlienImage,
+    PixMap              from Image,
 
     Array1OfEdge        from Aspect,
     CLayer2d            from Aspect,
@@ -93,7 +94,7 @@ uses
     CPlane              from Graphic3d,
     CStructure          from Graphic3d,
     CView               from Graphic3d,
-    CRawBufferData      from Image,
+    BufferType          from Graphic3d,
     Structure           from Graphic3d,
     TextPath            from Graphic3d,
     TypeOfComposition   from Graphic3d,
@@ -1008,8 +1009,9 @@ is
     ---Purpose: Change offscreen FBO viewport.
 
         BufferDump( me            : mutable;
-                    view          : CView from Graphic3d;
-                    buffer        : in out CRawBufferData from Image )
+                    theCView      : CView from Graphic3d;
+                    theImage      : in out PixMap from Image;
+                    theBufferType : BufferType from Graphic3d )
                    returns Boolean from Standard
     is deferred;
     ---Purpose: Dump active rendering buffer into specified memory buffer.