Move open coding of construction of attributes for cut regions and
text cursors to functions so that it is easier to fix and improve. This commit doesn't fix anything except for removing unnecessary complications and adding comments.
This commit is contained in:
Bruce Evans
parent
3ddbb27c55
commit
9cb3ac3bef
@ -344,6 +344,46 @@ static int vga_aspect_scale= 100;
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SYSCTL_INT(_machdep, OID_AUTO, vga_aspect_scale, CTLFLAG_RW,
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&vga_aspect_scale, 0, "Aspect scale ratio (3:4):actual times 100");
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static u_short
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vga_flipattr(u_short a, int blink)
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{
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if (blink)
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a = (a & 0x8800) | ((a & 0x7000) >> 4) |
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((a & 0x0700) << 4);
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else
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a = ((a & 0xf000) >> 4) | ((a & 0x0f00) << 4);
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return (a);
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}
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static u_short
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vga_cursorattr_adj(u_short a, int blink)
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{
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/*
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* !blink means pixel mode, and the cursor attribute in that case
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* is simplistic reverse video.
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*/
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if (!blink)
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return (vga_flipattr(a, blink));
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/*
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* The cursor attribute is usually that of the underlying char
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* with the bg changed to white. If the bg is already white,
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* then the bg is changed to black. The fg is usually not
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* changed, but if it is the same as the new bg then it is
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* changed to the inverse of the new bg.
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*/
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if ((a & 0x7000) == 0x7000) {
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a &= 0x8f00;
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if ((a & 0x0700) == 0)
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a |= 0x0700;
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} else {
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a |= 0x7000;
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if ((a & 0x0700) == 0x0700)
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a &= 0xf000;
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}
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return (a);
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}
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static void
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vga_setmdp(scr_stat *scp)
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{
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@ -436,8 +476,7 @@ vga_txtdraw(scr_stat *scp, int from, int count, int flip)
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for (p = sc_vtb_pointer(&scp->scr, from); count-- > 0; ++from) {
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c = sc_vtb_getc(&scp->vtb, from);
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a = sc_vtb_geta(&scp->vtb, from);
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a = (a & 0x8800) | ((a & 0x7000) >> 4)
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| ((a & 0x0700) << 4);
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a = vga_flipattr(a, TRUE);
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p = sc_vtb_putchar(&scp->scr, p, c, a);
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}
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} else {
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@ -482,8 +521,7 @@ draw_txtcharcursor(scr_stat *scp, int at, u_short c, u_short a, int flip)
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if (scp->curs_attr.base >= h)
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return;
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if (flip)
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a = (a & 0x8800)
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| ((a & 0x7000) >> 4) | ((a & 0x0700) << 4);
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a = vga_flipattr(a, TRUE);
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bcopy(font + c*h, font + sc->cursor_char*h, h);
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font = font + sc->cursor_char*h;
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for (i = imax(h - scp->curs_attr.base - scp->curs_attr.height, 0);
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@ -496,18 +534,9 @@ draw_txtcharcursor(scr_stat *scp, int at, u_short c, u_short a, int flip)
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} else
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#endif /* SC_NO_FONT_LOADING */
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{
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if ((a & 0x7000) == 0x7000) {
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a &= 0x8f00;
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if ((a & 0x0700) == 0)
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a |= 0x0700;
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} else {
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a |= 0x7000;
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if ((a & 0x0700) == 0x0700)
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a &= 0xf000;
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}
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a = vga_cursorattr_adj(a, TRUE);
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if (flip)
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a = (a & 0x8800)
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| ((a & 0x7000) >> 4) | ((a & 0x0700) << 4);
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a = vga_flipattr(a, TRUE);
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sc_vtb_putc(&scp->scr, at, c, a);
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}
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}
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@ -544,9 +573,7 @@ vga_txtcursor(scr_stat *scp, int at, int blink, int on, int flip)
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} else {
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cursor_attr = sc_vtb_geta(&scp->vtb, at);
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if (flip)
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cursor_attr = (cursor_attr & 0x8800)
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| ((cursor_attr & 0x7000) >> 4)
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| ((cursor_attr & 0x0700) << 4);
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cursor_attr = vga_flipattr(cursor_attr, TRUE);
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if (scp->status & VR_CURSOR_ON)
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sc_vtb_putc(&scp->scr, at,
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sc_vtb_getc(&scp->vtb, at),
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@ -875,13 +902,10 @@ vga_vgadraw_direct(scr_stat *scp, int from, int count, int flip)
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for (i = from; count-- > 0; ++i) {
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a = sc_vtb_geta(&scp->vtb, i);
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if (flip) {
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col1 = (((a & 0x7000) >> 4) | (a & 0x0800)) >> 8;
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col2 = (((a & 0x8000) >> 4) | (a & 0x0700)) >> 8;
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} else {
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col1 = (a & 0x0f00) >> 8;
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col2 = (a & 0xf000) >> 12;
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}
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if (flip)
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a = vga_flipattr(a, TRUE); /* XXX */
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col1 = (a & 0x0f00) >> 8;
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col2 = (a & 0xf000) >> 12;
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e = d;
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f = &(scp->font[sc_vtb_getc(&scp->vtb, i) * scp->font_size]);
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@ -932,13 +956,10 @@ vga_vgadraw_planar(scr_stat *scp, int from, int count, int flip)
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count = scp->xsize*scp->ysize - from;
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for (i = from; count-- > 0; ++i) {
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a = sc_vtb_geta(&scp->vtb, i);
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if (flip) {
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col1 = ((a & 0x7000) >> 4) | (a & 0x0800);
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col2 = ((a & 0x8000) >> 4) | (a & 0x0700);
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} else {
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col1 = (a & 0x0f00);
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col2 = (a & 0xf000) >> 4;
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}
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if (flip)
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a = vga_flipattr(a, TRUE); /* XXX */
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col1 = a & 0x0f00;
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col2 = (a & 0xf000) >> 4;
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/* set background color in EGA/VGA latch */
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if (bg != col2) {
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bg = col2;
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@ -1002,13 +1023,12 @@ draw_pxlcursor_direct(scr_stat *scp, int at, int on, int flip)
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a = sc_vtb_geta(&scp->vtb, at);
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if (flip) {
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col1 = ((on) ? (a & 0x0f00) : ((a & 0xf000) >> 4)) >> 8;
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col2 = ((on) ? ((a & 0xf000) >> 4) : (a & 0x0f00)) >> 8;
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} else {
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col1 = ((on) ? ((a & 0xf000) >> 4) : (a & 0x0f00)) >> 8;
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col2 = ((on) ? (a & 0x0f00) : ((a & 0xf000) >> 4)) >> 8;
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}
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if (flip)
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a = vga_flipattr(a, FALSE);
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if (on)
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a = vga_cursorattr_adj(a, FALSE);
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col1 = (a & 0x0f00) >> 8;
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col2 = a >> 12;
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f = &(scp->font[sc_vtb_getc(&scp->vtb, at) * scp->font_size +
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scp->font_size - scp->curs_attr.base - 1]);
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@ -1048,18 +1068,16 @@ draw_pxlcursor_planar(scr_stat *scp, int at, int on, int flip)
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/* set background color in EGA/VGA latch */
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a = sc_vtb_geta(&scp->vtb, at);
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if (flip)
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col = (on) ? ((a & 0xf000) >> 4) : (a & 0x0f00);
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else
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col = (on) ? (a & 0x0f00) : ((a & 0xf000) >> 4);
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a = vga_flipattr(a, FALSE);
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if (on)
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a = vga_cursorattr_adj(a, FALSE);
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col = (a & 0xf000) >> 4;
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outw(GDCIDX, col | 0x00); /* set/reset */
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outw(GDCIDX, 0xff08); /* bit mask */
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writeb(d, 0);
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c = readb(d); /* set bg color in the latch */
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/* foreground color */
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if (flip)
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col = (on) ? (a & 0x0f00) : ((a & 0xf000) >> 4);
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else
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col = (on) ? ((a & 0xf000) >> 4) : (a & 0x0f00);
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col = a & 0x0f00;
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outw(GDCIDX, col | 0x00); /* set/reset */
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f = &(scp->font[sc_vtb_getc(&scp->vtb, at)*scp->font_size
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+ scp->font_size - scp->curs_attr.base - 1]);
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