1. A method of filtering high bit-count texels based on coverage information, comprising: receiving texture map coordinates for the high bit-count texels mapped to a pixel quad that includes four pixels; receiving the coverage information indicating whether or not each of the four pixels is covered by a graphics primitive; splitting the pixel quad into a first pixel pair including two of the four pixels that are covered by the graphics primitive and a second pixel pair including another two of the four pixels; processing within a graphics processor the high bit-count texels mapped to the first pixel pair to produce filtered high bit-count texels for the pixel quad.