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Optimize setting of the foreground color in the main planar method much

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like for the background color.

This is a about 5% faster for output that actually reaches the screen.
This commit is contained in:
Bruce Evans 2017-04-21 17:57:23 +00:00
parent 3df57f416b
commit 6284ff8398
1 changed files with 7 additions and 3 deletions
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10
sys/dev/syscons/scvgarndr.c
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@ -736,7 +736,7 @@ vga_vgadraw_planar(scr_stat *scp, int from, int count, int flip)
vm_offset_t d;
vm_offset_t e;
u_char *f;
u_short bg;
u_short bg, fg;
u_short col1, col2;
int line_width;
int i, j;
@ -754,7 +754,7 @@ vga_vgadraw_planar(scr_stat *scp, int from, int count, int flip)
outw(GDCIDX, 0x0005); /* read mode 0, write mode 0 */
outw(GDCIDX, 0x0003); /* data rotate/function select */
outw(GDCIDX, 0x0f01); /* set/reset enable */
bg = -1;
fg = bg = -1;
if (from + count > scp->xsize*scp->ysize)
count = scp->xsize*scp->ysize - from;
for (i = from; count-- > 0; ++i) {
@ -769,6 +769,7 @@ vga_vgadraw_planar(scr_stat *scp, int from, int count, int flip)
/* set background color in EGA/VGA latch */
if (bg != col2) {
bg = col2;
fg = -1;
outw(GDCIDX, bg | 0x00); /* set/reset */
if (scp->sc->adp->va_type != KD_VGA)
outw(GDCIDX, 0xff08); /* bit mask */
@ -776,7 +777,10 @@ vga_vgadraw_planar(scr_stat *scp, int from, int count, int flip)
c = readb(d); /* set bg color in the latch */
}
/* foreground color */
outw(GDCIDX, col1 | 0x00); /* set/reset */
if (fg != col1) {
fg = col1;
outw(GDCIDX, col1 | 0x00); /* set/reset */
}
e = d;
f = &(scp->font[sc_vtb_getc(&scp->vtb, i)*scp->font_size]);
for (j = 0; j < scp->font_size; ++j, ++f) {