A shader (as used by Paint.shader) that tiles an image.
- ImageShader(Image image, TileMode tmx, TileMode tmy, Float64List matrix4)
- Creates an image-tiling shader. The first argument specifies the image to tile. The second and third arguments specify the TileMode for the x direction and y direction respectively. The fourth argument gives the matrix to apply to the effect. All the arguments are required and must not be null.