Changed: Implement and use CBitmap::makeTransparentPixelsBlack()

--HG--
branch : develop

code/nel/include/nel/misc/bitmap.h

@@ -375,6 +375,12 @@ public:
 	void	makeOpaque();
 
 
+	/**
+	* Make fully transparent pixels (alpha 0) black.
+	*/
+	void	makeTransparentPixelsBlack();
+
+
 	/**
 	 * Return if the bitmap has uniform alpha values for all pixels.
 	 * \param alpha return the uniform value if return is true

code/nel/src/misc/bitmap.cpp

@@ -369,6 +369,51 @@ void	CBitmap::makeOpaque()
 }
 
 
+/*-------------------------------------------------------------------*\
+					makeTransparentPixelsBlack
+\*-------------------------------------------------------------------*/
+void	CBitmap::makeTransparentPixelsBlack()
+{
+	if (_Width*_Height == 0) return;
+
+	uint pixelSize;
+
+	switch (PixelFormat)
+	{
+		case RGBA: pixelSize = 4; break;
+		case AlphaLuminance: pixelSize = 2; break;
+		default: return;
+	}
+
+	uint colorsSize = pixelSize - 1;
+
+	for (uint8 m = 0; m < _MipMapCount; ++m)
+	{
+		// get a pointer on original data
+		uint8 *data = _Data[m].getPtr();
+
+		// end of data
+		uint8 *endData = data + _Data[m].size();
+
+		// first alpha
+		data += pixelSize - 1;
+
+		// replace all alpha values by 255
+		while (data < endData)
+		{
+			// fully transparent pixel
+			if (*data == 0)
+			{
+				// make colors black
+				memset(data - colorsSize, 0, colorsSize);
+			}
+
+			data += pixelSize;
+		}
+	}
+}
+
+
 /*-------------------------------------------------------------------*\
 								isAlphaUniform
 \*-------------------------------------------------------------------*/

code/nel/tools/3d/build_interface/main.cpp

@@ -350,6 +350,9 @@ int main(int argc, char **argv)
 		UVMax[i].V = UVMax[i].V / (float)GlobalTexture.getHeight();
 	}
 
+	// make sure transparent pixels are black
+	GlobalTexture.makeTransparentPixelsBlack();
+
 	// Write global texture file
 	if (writeFileDependingOnFilename(fmtName, GlobalTexture))
 	{