tdf#103801 JPEG - don't handle buffer orientation in import

We don't need to read buffer in reverse scanline order if image
is bottom-up. This is handled by CopyScanline already.

Change-Id: Ibb20978c01115743de8a457e56003d28ef6dd6d9
Reviewed-on: https://gerrit.libreoffice.org/30710Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>

vcl/source/filter/jpeg/jpegc.cxx

@@ -177,16 +177,6 @@ void ReadJPEG( JPEGReader* pJPEGReader, void* pInputStream, long* pLines,
                 pCYMKBuffer.resize(nWidth * 4);
             }
 
-            const ScanlineFormat nFormat = pAccess->GetScanlineFormat();
-
-            bool bTopDown = true;
-
-            if (( bGray && nFormat == ScanlineFormat::N8BitPal) ||
-                (!bGray && nFormat == ScanlineFormat::N24BitTcRgb))
-            {
-                bTopDown = pAccess->IsTopDown();
-            }
-
             std::unique_ptr<BitmapColor[]> pCols;
 
             if (bGray)
@@ -228,9 +218,6 @@ void ReadJPEG( JPEGReader* pJPEGReader, void* pInputStream, long* pLines,
                     jpeg_read_scanlines(&cinfo, reinterpret_cast<JSAMPARRAY>(&p), 1);
                 }
 
-                if (!bTopDown)
-                    yIndex = nHeight - 1 - yIndex;
-
                 if (bGray)
                 {
                     for (long x = 0; x < nWidth; ++x)