Fix dependencies between kernel options:

- When both SC_PIXEL_MODE and SC_NO_FONT_LOADING are defined,
  quietly drop SC_NO_FONT_LOADING, because the pixel(raster)
  console requires font.
- When SC_NO_FONT_LOADING is defined, force SC_ALT_MOUSE_IMAGE.
  Without font, the arrow-shaped mouse cursor cannot be drawn.
- Fiddle and simplify some internal macros.
MFC after:	2 weeks

sys/dev/syscons/scgfbrndr.c

@@ -325,6 +325,7 @@ static void
 draw_txtmouse(scr_stat *scp, int x, int y)
 {
 #ifndef SC_ALT_MOUSE_IMAGE
+    if (ISMOUSEAVAIL(scp->sc->adp->va_flags)) {
 	u_char font_buf[128];
 	u_short cursor[32];
 	u_char c;
@@ -384,7 +385,9 @@ draw_txtmouse(scr_stat *scp, int x, int y)
 		sc_vtb_putc(&scp->scr, pos + scp->xsize + 1, c + 3,
 			    sc_vtb_geta(&scp->scr, pos + scp->xsize + 1));
 	}
-#else /* SC_ALT_MOUSE_IMAGE */
+    } else
+#endif /* SC_ALT_MOUSE_IMAGE */
+    {
 	/* Red, magenta and brown are mapped to green to to keep it readable */
 	static const int col_conv[16] = {
 		6, 6, 6, 6, 2, 2, 2, 6, 14, 14, 14, 14, 10, 10, 10, 14
@@ -401,7 +404,7 @@ draw_txtmouse(scr_stat *scp, int x, int y)
 	else
 		color = ((a & 0xf000) >> 4) | ((a & 0x0f00) << 4);
 	sc_vtb_putc(&scp->scr, pos, sc_vtb_getc(&scp->scr, pos), color);
-#endif /* SC_ALT_MOUSE_IMAGE */
+    }
 }
 
 static void

sys/dev/syscons/scmouse.c

@@ -669,8 +669,6 @@ sc_mouse_ioctl(struct tty *tp, u_long cmd, caddr_t data, int flag,
 	    return 0;
 
 	case MOUSE_SHOW:
-	    if (!ISMOUSEAVAIL(scp->sc->adp->va_flags))
-		return EINVAL;
 	    s = spltty();
 	    if (!(scp->sc->flags & SC_MOUSE_ENABLED)) {
 		scp->sc->flags |= SC_MOUSE_ENABLED;

sys/dev/syscons/scvgarndr.c

@@ -325,6 +325,7 @@ static void
 draw_txtmouse(scr_stat *scp, int x, int y)
 {
 #ifndef SC_ALT_MOUSE_IMAGE
+    if (ISMOUSEAVAIL(scp->sc->adp->va_flags)) {
 	u_char font_buf[128];
 	u_short cursor[32];
 	u_char c;
@@ -384,7 +385,9 @@ draw_txtmouse(scr_stat *scp, int x, int y)
 		sc_vtb_putc(&scp->scr, pos + scp->xsize + 1, c + 3,
 			    sc_vtb_geta(&scp->scr, pos + scp->xsize + 1));
 	}
-#else /* SC_ALT_MOUSE_IMAGE */
+    } else
+#endif /* SC_ALT_MOUSE_IMAGE */
+    {
 	/* Red, magenta and brown are mapped to green to to keep it readable */
 	static const int col_conv[16] = {
 		6, 6, 6, 6, 2, 2, 2, 6, 14, 14, 14, 14, 10, 10, 10, 14
@@ -401,7 +404,7 @@ draw_txtmouse(scr_stat *scp, int x, int y)
 	else
 		color = ((a & 0xf000) >> 4) | ((a & 0x0f00) << 4);
 	sc_vtb_putc(&scp->scr, pos, sc_vtb_getc(&scp->scr, pos), color);
-#endif /* SC_ALT_MOUSE_IMAGE */
+    }
 }
 
 static void

sys/dev/syscons/syscons.c

@@ -412,8 +412,6 @@ scmeminit(void *arg)
     sc_alloc_scr_buffer(sc_console, FALSE, FALSE);
 
 #ifndef SC_NO_CUTPASTE
-    /* cut buffer is available only when the mouse pointer is used */
-    if (ISMOUSEAVAIL(sc_console->sc->adp->va_flags))
     sc_alloc_cut_buffer(sc_console, FALSE);
 #endif
 
@@ -2801,7 +2799,6 @@ static scr_stat
 	sc_init_emulator(scp, "*");
 
 #ifndef SC_NO_CUTPASTE
-    if (ISMOUSEAVAIL(sc->adp->va_flags))
     sc_alloc_cut_buffer(scp, TRUE);
 #endif
 

sys/dev/syscons/syscons.h

@@ -56,6 +56,20 @@
 #undef SC_PIXEL_MODE
 #endif
 
+/* Always load font data if the pixel (raster text) mode is to be used. */
+#ifdef SC_PIXEL_MODE
+#undef SC_NO_FONT_LOADING
+#endif
+
+/* 
+ * If font data is not available, the `arrow'-shaped mouse cursor cannot
+ * be drawn.  Use the alternative drawing method.
+ */
+#ifdef SC_NO_FONT_LOADING
+#undef SC_ALT_MOUSE_IMAGE
+#define SC_ALT_MOUSE_IMAGE 1
+#endif
+
 #ifndef SC_CURSOR_CHAR
 #define SC_CURSOR_CHAR	(0x07)
 #endif
@@ -456,15 +470,9 @@ typedef struct {
 			  == PIXEL_MODE)
 #define ISUNKNOWNSC(scp) ((scp)->status & UNKNOWN_MODE)
 
-#ifndef ISMOUSEAVAIL
-#ifdef SC_ALT_MOUSE_IMAGE
-#define ISMOUSEAVAIL(af) (1)
-#else
 #define ISMOUSEAVAIL(af) ((af) & V_ADP_FONT)
-#endif /* SC_ALT_MOUSE_IMAGE */
 #define ISFONTAVAIL(af)	((af) & V_ADP_FONT)
 #define ISPALAVAIL(af)	((af) & V_ADP_PALETTE)
-#endif /* ISMOUSEAVAIL */
 
 #define ISSIGVALID(sig)	((sig) > 0 && (sig) < NSIG)