ImageShader constructor
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.
Implementation
@pragma('vm:entry-point')
ImageShader(Image image, TileMode tmx, TileMode tmy, Float64List matrix4) :
assert(image != null), // image is checked on the engine side
assert(tmx != null),
assert(tmy != null),
assert(matrix4 != null),
super._() {
if (matrix4.length != 16)
throw new ArgumentError('"matrix4" must have 16 entries.');
_constructor();
_initWithImage(image, tmx.index, tmy.index, matrix4);
}