the width of the texture the region is for
the height of the texture the region is for
the top (x) of the region on the texture (in pixels)
the left (y) of the region on the texture (in pixels)
the width of the region on the texture (in pixels)
the height of the region on the texture (in pixels)
Top/Left U,V Coordinates
Bottom/Right U,V Coordinates
Top/Left U,V Coordinates
Bottom/Right U,V Coordinates
calculate U,V coordinates from specified texture coordinates