Creates a texture from a canvas element.
		This is almost the same as the base [page:Texture Texture] class, except that it sets [page:Texture.needsUpdate needsUpdate] to *true* immediately.
		
		[page:HTMLElement canvas] -- The HTML canvas element from which to load the texture. 
		[page:Constant mapping] --  How the image is applied to the object. An object type of [page:Textures THREE.UVMapping].
		See [page:Textures mapping constants] for other choices.
		[page:Constant wrapS] -- The default is [page:Textures THREE.ClampToEdgeWrapping].
		See [page:Textures wrap mode constants] for other choices.
		[page:Constant wrapT] -- The default is [page:Textures THREE.ClampToEdgeWrapping].
		See [page:Textures wrap mode constants] for other choices.
		[page:Constant magFilter] -- How the texture is sampled when a texel covers more than one pixel.
		The default is [page:Textures THREE.LinearFilter]. See [page:Textures magnification filter constants] for other choices.
		[page:Constant minFilter] -- How the texture is sampled when a texel covers less than one pixel.
		 The default is [page:Textures THREE.LinearMipmapLinearFilter]. See [page:Textures minification filter constants] for other choices.
    [page:Constant format] -- The format used in the texture.
     See [page:Textures format constants] for other choices.
    [page:Constant type] -- Default is [page:Textures THREE.UnsignedByteType].
     See [page:Textures type constants] for other choices.
		[page:Number anisotropy] -- The number of samples taken along the axis through the pixel that has the highest density of texels.
		By default, this value is 1. A higher value gives a less blurry result than a basic mipmap, at the cost of more texture samples being used.
		Use [page:WebGLrenderer.getMaxAnisotropy renderer.getMaxAnisotropy]() to find the maximum valid anisotropy value for the GPU; this value is usually a power of 2.
		
See the base [page:Texture Texture] class for common properties.
True by default. This is required so that the canvas data is loaded.
See the base [page:Texture Texture] class for common methods.
[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]