Changed: Implement AlphaLuminance resample

--HG--
branch : develop

code/nel/src/misc/bitmap.cpp

@@ -1792,7 +1792,7 @@ void CBitmap::releaseMipMaps()
 \*-------------------------------------------------------------------*/
 void CBitmap::resample(sint32 nNewWidth, sint32 nNewHeight)
 {
-	nlassert(PixelFormat == RGBA || PixelFormat == Luminance);
+	nlassert(PixelFormat == RGBA || PixelFormat == Luminance || PixelFormat == AlphaLuminance);
 	bool needRebuild = false;
 
 	// Deleting mipmaps
@@ -1832,6 +1832,58 @@ void CBitmap::resample(sint32 nNewWidth, sint32 nNewHeight)
 		resamplePicture8 (&_Data[0][0], pDestGray, _Width, _Height, nNewWidth, nNewHeight);
 		//logResample("Resample: 60");
 	}
+	else if (PixelFormat == AlphaLuminance)
+	{
+		pDestui.resize(nNewWidth*nNewHeight*2);
+
+		uint16 *pSrc = (uint16*)&_Data[0][0];
+		uint16 *pDest = (uint16*)&pDestui[0];
+
+		size_t srcSize = _Width*_Width;
+		uint8 *pSrcGray = new uint8[srcSize];
+		uint8 *pSrcAlpha = new uint8[srcSize];
+
+		// set iterators
+		uint16 *i = (uint16*)pSrc;
+		uint16 *iEnd = (uint16*)i + srcSize;
+		uint8 *iGray = pSrcGray;
+		uint8 *iAlpha = pSrcAlpha;
+
+		// copy alpha and gray in distinct arrays
+		while (i < iEnd)
+		{
+			*(iGray++) = (*i) & 0xff;
+			*(iAlpha++) = ((*i) >> 8) & 0xff;
+			++i;
+		}
+
+		size_t destSize = nNewWidth*nNewHeight;
+
+		// resample gray values array
+		uint8 *pDestGray = new uint8[destSize];
+		resamplePicture8(pSrcGray, pDestGray, _Width, _Height, nNewWidth, nNewHeight);
+		delete[] pSrcGray;
+
+		// resample alpha values array
+		uint8 *pDestAlpha = new uint8[destSize];
+		resamplePicture8(pSrcAlpha, pDestAlpha, _Width, _Height, nNewWidth, nNewHeight);
+		delete[] pSrcAlpha;
+
+		// set iterators
+		i = (uint16*)pDest;
+		iEnd = (uint16*)i + destSize;
+		iGray = pDestGray;
+		iAlpha = pDestAlpha;
+
+		// merge alpha and gray in destination array
+		while (i < iEnd)
+		{
+			*(i++) = *(iGray++) | (*(iAlpha++) << 8);
+		}
+
+		delete[] pDestGray;
+		delete[] pDestAlpha;
+	}
 
 	NLMISC::contReset(_Data[0]); // free memory
 	//logResample("Resample: 70");
@@ -2148,7 +2200,7 @@ void CBitmap::resamplePicture32Fast (const NLMISC::CRGBA *pSrc, NLMISC::CRGBA *p
 
 
 /*-------------------------------------------------------------------*\
-							resamplePicture32
+							resamplePicture8
 \*-------------------------------------------------------------------*/
 void CBitmap::resamplePicture8 (const uint8 *pSrc, uint8 *pDest,
 								 sint32 nSrcWidth, sint32 nSrcHeight,