8bae6e480d
in unusual cases. Optimize and significantly clean up removal in this renderer. Optimize removal in the vga direct renderer. Removal only needs to be done in the border (the part with pixels) in both cases. The planar renderer used the condition scp->xoff > 0 to test whether a right border exists. This actually tests for a left border, and when the total horizontal border is 8 pixels, rounding gives only a right border. This was the unusual broken case. An example is easy to configure using something like "vidcontrol -f 8x16 iso-8x16 -g 79x25 MODE_27". Optimize the planar case a little by only removing 9x13 active pixels out of 16x16. Optimize it a lot by not doing anything if there is no overlap with the border. Don't unroll the main loop or hard-code so many assumptions about font sizes in it. On my Haswell system, graphics memory and i/o accesses takes about 520 cycles each so optimizations from unrolling are in the noise. Optimize the direct case to not do anything if there is no overlap with the border. Do a sanity check on the saveunder's coordinates. This requires a previous change to pass non-rounded coordinates.
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