OpenGLHelper: extract BGRA buffer -> BitmepEx conversion

Change-Id: I71edb2768d24f0c6686a9c94333447a5acc498b4

2 files changed, 31 insertions, 26 deletions

diff --git a/vcl/source/opengl/OpenGLContext.cxx b/vcl/source/opengl/OpenGLContext.cxx
index b8c963ba1fb6..07b38d2d60bd 100644
--- a/vcl/source/opengl/OpenGLContext.cxx
+++ b/vcl/source/opengl/OpenGLContext.cxx
@@ -8,6 +8,7 @@
  */
 
 #include <vcl/opengl/OpenGLContext.hxx>
+#include <vcl/opengl/OpenGLHelper.hxx>
 #include <vcl/syschild.hxx>
 #include <vcl/sysdata.hxx>
 
@@ -15,7 +16,6 @@
 #include <vcl/pngwrite.hxx>
 #include <vcl/bmpacc.hxx>
 #include <vcl/graph.hxx>
-#include <vcl/bitmapex.hxx>
 
 using namespace com::sun::star;
 
@@ -522,31 +522,7 @@ void OpenGLContext::renderToFile()
     boost::scoped_array<sal_uInt8> buf(new sal_uInt8[iWidth * iHeight * 4]);
     glReadPixels(0, 0, iWidth, iHeight, GL_BGRA, GL_UNSIGNED_BYTE, buf.get());
 
-    Bitmap aBitmap( Size(iWidth, iHeight), 24 );
-    AlphaMask aAlpha( Size(iWidth, iHeight) );
-
-    {
-        Bitmap::ScopedWriteAccess pWriteAccess( aBitmap );
-        AlphaMask::ScopedWriteAccess pAlphaWriteAccess( aAlpha );
-
-        size_t nCurPos = 0;
-        for( int y = 0; y < iHeight; ++y)
-        {
-            Scanline pScan = pWriteAccess->GetScanline(y);
-            Scanline pAlphaScan = pAlphaWriteAccess->GetScanline(y);
-            for( int x = 0; x < iWidth; ++x )
-            {
-                *pScan++ = buf[nCurPos];
-                *pScan++ = buf[nCurPos+1];
-                *pScan++ = buf[nCurPos+2];
-
-                nCurPos += 3;
-                *pAlphaScan++ = static_cast<sal_uInt8>( 255 - buf[nCurPos++] );
-            }
-        }
-    }
-
-    BitmapEx aBmp(aBitmap, aAlpha);
+    BitmapEx aBmp = OpenGLHelper::ConvertBGRABufferToBitmapEx(buf.get(), iWidth, iHeight);
     static int nIdx = 0;
     OUString aName = OUString( "file:///home/moggi/Documents/work/text" ) + OUString::number( nIdx++ ) + ".png";
     try {
diff --git a/vcl/source/opengl/OpenGLHelper.cxx b/vcl/source/opengl/OpenGLHelper.cxx
index 35760f2de72c..82b4a9affc03 100644
--- a/vcl/source/opengl/OpenGLHelper.cxx
+++ b/vcl/source/opengl/OpenGLHelper.cxx
@@ -168,4 +168,33 @@ sal_uInt8* OpenGLHelper::ConvertBitmapExToRGBABuffer(const BitmapEx& rBitmapEx)
     return pBitmapBuf;
 }
 
+BitmapEx OpenGLHelper::ConvertBGRABufferToBitmapEx(const sal_uInt8* const pBuffer, long nWidth, long nHeight)
+{
+    assert(pBuffer);
+    Bitmap aBitmap( Size(nWidth, nHeight), 24 );
+    AlphaMask aAlpha( Size(nWidth, nHeight) );
+
+    {
+        Bitmap::ScopedWriteAccess pWriteAccess( aBitmap );
+        AlphaMask::ScopedWriteAccess pAlphaWriteAccess( aAlpha );
+
+        size_t nCurPos = 0;
+        for( int y = 0; y < nHeight; ++y)
+        {
+            Scanline pScan = pWriteAccess->GetScanline(y);
+            Scanline pAlphaScan = pAlphaWriteAccess->GetScanline(y);
+            for( int x = 0; x < nWidth; ++x )
+            {
+                *pScan++ = pBuffer[nCurPos];
+                *pScan++ = pBuffer[nCurPos+1];
+                *pScan++ = pBuffer[nCurPos+2];
+
+                nCurPos += 3;
+                *pAlphaScan++ = static_cast<sal_uInt8>( 255 - pBuffer[nCurPos++] );
+            }
+        }
+    }
+    return BitmapEx(aBitmap, aAlpha);
+}
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */