tdf#92272: We need to twiddle the bytes from BGR to RGB

As far as I see, the surfaces created in the DX canvas are of
D3DFMT_A8R8G8B8 or D3DFMT_X8R8G8B8 format, which means that the bytes
(in memory order, on little-endian Windows) are B,G,R,A/X. So if the
desired destination wants R,G,B,A, we need to swap the blue and red
bytes.

Let's hope this doesn't break anything else...

Change-Id: I1b90d2cf95418f6557cac633ec6fce27599e8a61
Reviewed-on: https://gerrit.libreoffice.org/20161Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

canvas/source/directx/dx_surfacebitmap.cxx

@@ -19,6 +19,8 @@
 
 #include <string.h>
 
+#include <com/sun/star/rendering/ColorComponentTag.hpp>
+
 #include "dx_surfacebitmap.hxx"
 #include "dx_impltools.hxx"
 #include "dx_surfacegraphics.hxx"
@@ -438,7 +440,7 @@ namespace dxcanvas
     // DXSurfaceBitmap::getData
 
 
-    uno::Sequence< sal_Int8 > DXSurfaceBitmap::getData( rendering::IntegerBitmapLayout&     /*bitmapLayout*/,
+    uno::Sequence< sal_Int8 > DXSurfaceBitmap::getData( rendering::IntegerBitmapLayout& rBitmapLayout,
                                                         const geometry::IntegerRectangle2D& rect )
     {
         if(hasAlpha())
@@ -483,6 +485,11 @@ namespace dxcanvas
             D3DLOCKED_RECT aLockedRect;
             if(FAILED(mpSurface->LockRect(&aLockedRect,NULL,D3DLOCK_NOSYSLOCK|D3DLOCK_READONLY)))
                 return uno::Sequence< sal_Int8 >();
+            D3DSURFACE_DESC aDesc;
+            if(FAILED(mpSurface->GetDesc(&aDesc)))
+                return uno::Sequence< sal_Int8 >();
+
+            assert(aDesc.Format == D3DFMT_A8R8G8B8 || aDesc.Format == D3DFMT_X8R8G8B8);
 
             sal_uInt8 *pSrc = (sal_uInt8 *)((((BYTE *)aLockedRect.pBits)+(rect.Y1*aLockedRect.Pitch))+rect.X1);
             sal_uInt8 *pDst = (sal_uInt8 *)aRes.getArray();
@@ -494,6 +501,24 @@ namespace dxcanvas
                 pSrc += aLockedRect.Pitch;
             }
 
+            if(rBitmapLayout.ColorSpace->getComponentTags().getArray()[0] == rendering::ColorComponentTag::RGB_RED &&
+               rBitmapLayout.ColorSpace->getComponentTags().getArray()[2] == rendering::ColorComponentTag::RGB_BLUE)
+            {
+                pDst = (sal_uInt8 *)aRes.getArray();
+                for(sal_uInt32 y=0; y<nHeight; ++y)
+                {
+                    sal_uInt8* pPixel = pDst;
+                    for(sal_uInt32 n = 0; n<nWidth; n++)
+                    {
+                        sal_uInt8 nB = pPixel[0];
+                        pPixel[0] = pPixel[2];
+                        pPixel[2] = nB;
+                        pPixel += 4;
+                    }
+                    pDst += nSegmentSizeInBytes;
+                }
+            }
+
             mpSurface->UnlockRect();
             return aRes;
         }