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Oops, the previous commit swapped the main ega method with the main

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vga planar method (for testing that was supposed to be local that the
former still works).  The ega method works on vga but is about twice
as slow.  The vga method doesn't work on ega.

Optimize the main vga planar method a little.  For changing the
background color (which was otherwise optimized better than most
things), don't switch the write mode from 3 to 0 just to select
the pixel mask of 0xff obscurely by writing 0.  Just write 0xff
directly.
This commit is contained in:
Bruce Evans 2017-04-21 06:55:17 +00:00
parent 75e7a91649
commit 56e7a784ac
1 changed files with 3 additions and 5 deletions
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8
sys/dev/syscons/scvgarndr.c
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@ -525,9 +525,9 @@ vga_rndrinit(scr_stat *scp)
scp->rndr->clear = vga_pxlclear_planar;
scp->rndr->draw_border = vga_pxlborder_planar;
if (scp->sc->adp->va_type == KD_VGA)
scp->rndr->draw = vga_egadraw;
else
scp->rndr->draw = vga_vgadraw_planar;
else
scp->rndr->draw = vga_egadraw;
scp->rndr->draw_cursor = vga_pxlcursor_planar;
scp->rndr->blink_cursor = vga_pxlblink_planar;
scp->rndr->draw_mouse = vga_pxlmouse_planar;
@ -828,11 +828,9 @@ vga_vgadraw_planar(scr_stat *scp, int from, int count, int flip)
/* set background color in EGA/VGA latch */
if (bg != col2) {
bg = col2;
outw(GDCIDX, 0x0005); /* read mode 0, write mode 0 */
outw(GDCIDX, bg | 0x00); /* set/reset */
writeb(d, 0);
writeb(d, 0xff);
c = readb(d); /* set bg color in the latch */
outw(GDCIDX, 0x0305); /* read mode 0, write mode 3 */
}
/* foreground color */
outw(GDCIDX, col1 | 0x00); /* set/reset */