fix 3D 'fade' transitions

* canvas bitmaps created without transparency get an appropriate color
  space
* implement a color space for OpenGL RGBA to use instead of
  canvas::tools::getStdColorSpace(), which apparently uses VCL's
  interpretation of alpha (alpha == 0xff means full transparency,
  alpha == 0 full opacity).

Change-Id: I97f30533206b75132abd0bb0d290a279f15ae8a9

canvas/inc/canvas/canvastools.hxx

@@ -359,6 +359,14 @@ namespace canvas
          */
         CANVASTOOLS_DLLPUBLIC ::com::sun::star::uno::Reference< ::com::sun::star::rendering::XIntegerBitmapColorSpace> getStdColorSpace();
 
+        /** Return a color space for a default RGB integer format
+
+            Use this method for dead-simple bitmap implementations,
+            that map all their formats to 8888 RGB color (the last byte
+            is unused).
+         */
+        CANVASTOOLS_DLLPUBLIC ::com::sun::star::uno::Reference< ::com::sun::star::rendering::XIntegerBitmapColorSpace> getStdColorSpaceWithoutAlpha();
+
         /** Return a memory layout for a default RGBA integer format
 
             Use this method for dead-simple bitmap implementations,

canvas/source/cairo/cairo_canvashelper.hxx

@@ -301,6 +301,8 @@ namespace cairocanvas
                         const ::com::sun::star::rendering::RenderState& renderState,
                         bool setColor );
 
+        com::sun::star::rendering::IntegerBitmapLayout impl_getMemoryLayout( sal_Int32 nWidth, sal_Int32 nHeight );
+
         /// When true, content is able to represent alpha
         bool mbHaveAlpha;
 

canvas/source/vcl/canvasbitmaphelper.cxx

@@ -539,7 +539,11 @@ namespace vclcanvas
         if( !mpOutDev.get() )
             return rendering::IntegerBitmapLayout(); // we're disposed
 
-        return ::canvas::tools::getStdMemoryLayout(getSize());
+        rendering::IntegerBitmapLayout xBitmapLayout( ::canvas::tools::getStdMemoryLayout(getSize()) );
+        if ( !hasAlpha() )
+            xBitmapLayout.ColorSpace = canvas::tools::getStdColorSpaceWithoutAlpha();
+
+        return xBitmapLayout;
     }
 
     BitmapEx CanvasBitmapHelper::getBitmap() const

canvas/source/vcl/canvashelper.cxx

@@ -1195,7 +1195,11 @@ namespace vclcanvas
         if( !mpOutDev.get() )
             return rendering::IntegerBitmapLayout(); // we're disposed
 
-        return ::canvas::tools::getStdMemoryLayout(getSize());
+        rendering::IntegerBitmapLayout xBitmapLayout( ::canvas::tools::getStdMemoryLayout(getSize()) );
+        if ( !mbHaveAlpha )
+            xBitmapLayout.ColorSpace = canvas::tools::getStdColorSpaceWithoutAlpha();
+
+        return xBitmapLayout;
     }
 
     int CanvasHelper::setupOutDevState( const rendering::ViewState&     viewState,

canvas/source/vcl/devicehelper.cxx

@@ -194,7 +194,9 @@ namespace vclcanvas
         {
             uno::Reference<rendering::XColorSpace> operator()()
             {
-                return vcl::unotools::createStandardColorSpace();
+                uno::Reference< rendering::XColorSpace > xColorSpace( canvas::tools::getStdColorSpace(), uno::UNO_QUERY );
+                assert( xColorSpace.is() );
+                return xColorSpace;
             }
         };
     }