TGAs and transparency

video::CTexture* IImageResourceLoader::createTextureARGB(const std::string& name, const video::dimension2d& size,							const unsigned char* tex_data, unsigned int tex_data_size) const{	HRESULT res;	if( !tex_data ){		util::LogManager::log( boost::format("%1%: No texture data supplied while attempting to load texture \"%2%\"") %			__FUNCTION__ % name, util::MSGTYPE_ERROR);		return NULL;	}	// if the texture data size is given as 0, we have a problem	if( tex_data_size == 0 ){		util::LogManager::log( boost::format("%1%: Texture data size given as 0 while attempting to load texture \"%2%\"") %			__FUNCTION__ % name, util::MSGTYPE_ERROR);		return NULL;	}	unsigned int	height = (unsigned int)size.height, 					width = (unsigned int)size.width,					mipmap_levels = 1;	D3DFORMAT tex_format = D3DFMT_A8R8G8B8;	// use 'D3DXCheckTextureRequirements' to get the corrected options for the image	if( FAILED(res=D3DXCheckTextureRequirements(m_d3d9Device, 			&width,				// stores the corrected width			&height,			// stores the corrected height			NULL,				// stores the corrected number of mip map levels (doesn't matter at the moment)			0,					// usage - either 0 or D3DUSAGE_RENDERTARGET. This is not a render target.			&tex_format,		// stores the corrected format (should be ARGB)			D3DPOOL_MANAGED		// the memory pool we intend to store the texture in			) ) )	{		util::LogManager::log(boost::format("%1%: Attempt to get corrected texture options via 'D3DXCheckTextureRequirements' failed: "			"D3D error: \"%2%\"") % __FUNCTION__ % video::getDirect3DError(res), util::MSGTYPE_ERROR);		return NULL;	}	// create a texture object	IDirect3DTexture9* tex = NULL;	// load the file	if( FAILED(res=m_d3d9Device->CreateTexture(width, height, mipmap_levels, 0, tex_format, D3DPOOL_MANAGED, &tex, NULL)) ){		util::LogManager::log(boost::format("%1%: Error in creating texture object with size %2%x%3%: D3D error: \"%4%\"") %			__FUNCTION__ % width % height % video::getDirect3DError(res), util::MSGTYPE_ERROR);		return NULL;	}	// load the texture data into the first surface (mip map level) of the texture	IDirect3DSurface9* surface = NULL;	if( FAILED(res=tex->GetSurfaceLevel(0, &surface)) ){		util::LogManager::log(boost::format("%1%: Error in getting pointer to top mip map level of texture: D3D error: \"%2%\"") % __FUNCTION__ %			video::getDirect3DError(res), util::MSGTYPE_ERROR);		return NULL;	}	RECT rect;	// the dimensions of the source image	rect.left = 0;								// the x coord of the upper left rect corner	rect.top = 0;								// the y coord of the upper left rect corner 	rect.right = (unsigned int) size.width;		// the x coord of the lower right rect corner	rect.bottom = (unsigned int) size.height;	// the y coord of the lower right rect corner	// attempt to load the ARGB pixel data into the first mip map level of the texture	if( FAILED(res=D3DXLoadSurfaceFromMemory(surface,			// pointer to the mip map level to load the data into			NULL,				// pointer to the destination pallette - don't need this			NULL,				// specify the destination rectangle - don't need this			tex_data,			// pointer to the upper left corner of the source image 	// in memory - who knows if we're at the right corner!?!?!?!?			D3DFMT_A8R8G8B8,	// the pixel format of the source image			(unsigned int)size.width*4,		// the 'pitch' of the image - length of one row of the image, in bytes			NULL,				// the source pallette - don't need this			▭,				// the dimensions of the source image			D3DX_DEFAULT,		// how to filter the image			D3DCOLOR_ARGB(0,0,0,0)	// specify the color to use as transparent - I think this disables it			) ) )	{		util::LogManager::log(boost::format("%1%: Error in loading pixel data into first map map level (first surface) of newly created texture: "			"D3D error: \"%2%\"") % __FUNCTION__ % video::getDirect3DError(res), util::MSGTYPE_ERROR);		// we need to call surface->Release() when we have finished using it. Otherwise we will get a memory leak!!		surface->Release();		return NULL;	}	// we need to call surface->Release() when we have finished using it. Otherwise we will get a memory leak!!	surface->Release();	// now we just call 'D3DXFilterTexture' to create the rest of the mip map levels	if( FAILED(res=D3DXFilterTexture(tex,	// the texture we're creating the mip map levels for		NULL,	// the pallette - again, who cares? Not me.		0,		// the mip map level that is used to create the rest of the mip map levels - 0 is the top level		D3DX_DEFAULT	// the type of filtering to use when creating the rest of the mip map levels		) ) )	{		util::LogManager::log(boost::format("%1%: Error in creating the rest of the mip map levels using 'D3DXFilterTexture': D3D error: \"%2%\"") %			__FUNCTION__ % video::getDirect3DError(res), util::MSGTYPE_ERROR);		return NULL;	}	// else, D3D was successful in loading, so create the 'CTexture' object	video::CTexture* texture = new video::CTexture(name, size, tex_data, tex_data_size, tex, m_resourceManager);	return texture;}