	{
		
		tmpAAMultiplier = AntiAliasMultiplier(_layerYYTransMat, canvasCoords.xy, _layerYYCropRect);
		if (tmpAAMultiplier > 0.0)	{
			tmpPixelCoords = _layerYYTransMat * canvasCoords;
			tmpPixelCoords = vec4(tmpPixelCoords.x/tmpPixelCoords.w, tmpPixelCoords.y/tmpPixelCoords.w, tmpPixelCoords.z, tmpPixelCoords.w);
			tmpPixelVal = LAYER_TEXSAMPLE(_layerYYTex, tmpPixelCoords.xy) * vec4(tmpAAMultiplier,tmpAAMultiplier,tmpAAMultiplier,1.0);
			//	if this is the first pixel i've sampled, use the appropriate "bottom" composition function
			if (!sampledAPixel)	{
				cumulativePixelVal = COMPB(tmpPixelVal, _layerYYAlphaVal);
				sampledAPixel = true;
			}
			//	else i've already sampled a pixel- perform composition
			else
				cumulativePixelVal = COMPBandT(cumulativePixelVal, 1.0, tmpPixelVal, _layerYYAlphaVal);
		}
	}