fix filterMode.

Runtime/ui/painting/canvas_impl.cs

                 width = textureWidth,
                 height = textureHeight,
                 layerBounds = maskBounds,
+                filterMode = FilterMode.Bilinear,
             };
 
             parentLayer.layers.Add(maskLayer);
                 width = textureWidth,
                 height = textureHeight,
                 layerBounds = maskLayer.layerBounds,
+                filterMode = FilterMode.Bilinear,
             };
 
             parentLayer.layers.Add(blurXLayer);
                 width = textureWidth,
                 height = textureHeight,
                 layerBounds = maskLayer.layerBounds,
+                filterMode = FilterMode.Bilinear,
             };
 
             parentLayer.layers.Add(blurYLayer);
                     desc.msaaSamples = QualitySettings.antiAliasing;
                 }
                 
-                cmdBuf.GetTemporaryRT(subLayer.rtID, desc, FilterMode.Bilinear);
+                cmdBuf.GetTemporaryRT(subLayer.rtID, desc, subLayer.filterMode);
                 this._drawLayer(subLayer, cmdBuf);
             }
 
             public int rtID;
             public int width;
             public int height;
+            public FilterMode filterMode = FilterMode.Point;
             public Rect layerBounds;
             public Paint layerPaint;
             public readonly List<object> draws = new List<object>();

Runtime/ui/painting/canvas_shader.cs

 
             var mat = _texMat.getMaterial(paint.blendMode, layer.ignoreClip);
             _getShaderPassAndProps(viewport, ctm, paint, 1.0f, out var pass, out var props);
+
+            image.texture.filterMode = paint.filterMode;
             props.SetTexture("_tex", image.texture);
             props.SetInt("_texMode", image.texture is RenderTexture ? 1 : 0); // pre alpha if RT else post alpha
 
             MeshMesh mesh, PictureFlusher.RenderLayer renderLayer) {
             Vector4 viewport = layer.viewport;
             Matrix3 ctm = layer.states[layer.states.Count - 1].matrix;
-
 
             var mat = _texMat.getMaterial(paint.blendMode, layer.ignoreClip);
             _getShaderPassAndProps(viewport, ctm, paint, 1.0f, out var pass, out var props);
 
             var mat = _texMat.getMaterial(paint.blendMode, layer.ignoreClip);
             _getShaderPassAndProps(viewport, ctm, paint, 1.0f, out var pass, out var props);
+            tex.filterMode = paint.filterMode;
             props.SetTexture("_tex", tex);
             props.SetInt("_texMode", 2); // alpha only