Adds a backend texture to the scene.
The texture is scaled to the given size and rasterized at the given offset.
Source
void addTexture(int textureId, { Offset offset: Offset.zero, double width: 0.0, double height: 0.0 }) { assert(offset != null, 'Offset argument was null'); _addTexture(offset.dx, offset.dy, width, height, textureId); }