UnityEngine.UI.StencilMaterial.Remove C# (CSharp) Method

        public static void Remove(Material customMat)
        {
            if (customMat != null)
            {
                for (int i = 0; i < m_List.Count; i++)
                {
                    MatEntry entry = m_List[i];
                    if (entry.customMat == customMat)
                    {
                        if (--entry.count == 0)
                        {
                            Misc.DestroyImmediate(entry.customMat);
                            entry.baseMat = null;
                            m_List.RemoveAt(i);
                        }
                        break;
                    }
                }
            }
        }

        /// Stencil calculation time!
        public virtual Material GetModifiedMaterial(Material baseMaterial)
        {
            if (graphic == null)
            {
                return(baseMaterial);
            }

            var rootSortCanvas = MaskUtilities.FindRootSortOverrideCanvas(transform);
            var stencilDepth   = MaskUtilities.GetStencilDepth(transform, rootSortCanvas);

            if (stencilDepth >= 8)
            {
                Debug.LogError("Attempting to use a stencil mask with depth > 8", gameObject);
                return(baseMaterial);
            }

            int desiredStencilBit = 1 << stencilDepth;

            // if we are at the first level...
            // we want to destroy what is there
            if (desiredStencilBit == 1)
            {
                var maskMaterial = StencilMaterial.Add(baseMaterial, 1, StencilOp.Replace, CompareFunction.Always, m_ShowMaskGraphic ? ColorWriteMask.All : 0);
                StencilMaterial.Remove(m_MaskMaterial);
                m_MaskMaterial = maskMaterial;

                var unmaskMaterial = StencilMaterial.Add(baseMaterial, 1, StencilOp.Zero, CompareFunction.Always, 0);
                StencilMaterial.Remove(m_UnmaskMaterial);
                m_UnmaskMaterial = unmaskMaterial;
                graphic.canvasRenderer.popMaterialCount = 1;
                graphic.canvasRenderer.SetPopMaterial(m_UnmaskMaterial, 0);

                return(m_MaskMaterial);
            }

            //otherwise we need to be a bit smarter and set some read / write masks
            var maskMaterial2 = StencilMaterial.Add(baseMaterial, desiredStencilBit | (desiredStencilBit - 1), StencilOp.Replace, CompareFunction.Equal, m_ShowMaskGraphic ? ColorWriteMask.All : 0, desiredStencilBit - 1, desiredStencilBit | (desiredStencilBit - 1));

            StencilMaterial.Remove(m_MaskMaterial);
            m_MaskMaterial = maskMaterial2;

            graphic.canvasRenderer.hasPopInstruction = true;
            var unmaskMaterial2 = StencilMaterial.Add(baseMaterial, desiredStencilBit - 1, StencilOp.Replace, CompareFunction.Equal, 0, desiredStencilBit - 1, desiredStencilBit | (desiredStencilBit - 1));

            StencilMaterial.Remove(m_UnmaskMaterial);
            m_UnmaskMaterial = unmaskMaterial2;
            graphic.canvasRenderer.popMaterialCount = 1;
            graphic.canvasRenderer.SetPopMaterial(m_UnmaskMaterial, 0);

            return(m_MaskMaterial);
        }