/* There are four clipping rectangles. Their corner coordinates are inclusive. * Every pixel is assigned a number from 0 and 15 by setting bits 0-3 depending * on whether the pixel is inside cliprects 0-3, respectively. For example, * if a pixel is inside cliprects 0 and 1, but outside 2 and 3, it is assigned * the number 3 (binary 0011). * Iff the bit corresponding to the pixel's number in RE_CLIPRECT_CNTL is set, * the pixel is rasterized. * * In addition to this, there is a scissors rectangle. Only pixels inside the * scissors rectangle are drawn. (coordinates are inclusive) * * For some reason, the top-left corner of the framebuffer is at (1440, 1440) * for the purpose of clipping and scissors. */