Substantial overhaul of colour handling in do_text(). Highlights include:

* No more mucking about with transfer modes.  We always set up the foreground
  and background sensibly, EraseRect the whole lot and use srcOr.  Apple
  Tech Note QD505 suggests that this should be faster than srcCopy.
* Always use the Palette Manager if we've got Color QuickDraw, even in 1bpp
  modes.
* Apply the cursor colours _after_ all the other stuff, rather than trying to
  get them through everything else intact.

Unfortunately, this doesn't make much difference to the speed.

[originally from svn r2259]

mac/macterm.c

@@ -1,4 +1,4 @@
-/* $Id: macterm.c,v 1.11 2002/11/24 00:38:44 ben Exp $ */
+/* $Id: macterm.c,v 1.12 2002/11/26 01:32:51 ben Exp $ */
 /*
  * Copyright (c) 1999 Simon Tatham
  * Copyright (c) 1999, 2002 Ben Harris
@@ -793,7 +793,6 @@ static void mac_drawgrowicon(Session *s) {
 struct do_text_args {
     Session *s;
     Rect textrect;
-    Rect leadrect;
     char *text;
     int len;
     unsigned long attr;
@@ -827,12 +826,6 @@ void do_text(Context ctx, int x, int y, char *text, int len,
     a.len = len;
     a.attr = attr;
     a.lattr = lattr;
-    if (s->font_leading > 0)
-	SetRect(&a.leadrect,
-		a.textrect.left, a.textrect.bottom - s->font_leading,
-		a.textrect.right, a.textrect.bottom);
-    else
-	SetRect(&a.leadrect, 0, 0, 0, 0);
     SetPort(s->window);
     TextFont(s->fontnum);
     if (s->cfg.fontisbold || (attr & ATTR_BOLD) && !s->cfg.bold_colour)
@@ -841,6 +834,7 @@ void do_text(Context ctx, int x, int y, char *text, int len,
 	style |= underline;
     TextFace(style);
     TextSize(s->cfg.fontheight);
+    TextMode(srcOr);
     SetFractEnable(FALSE); /* We want characters on pixel boundaries */
     if (HAVE_COLOR_QD())
 	if (style & bold) {
@@ -864,55 +858,53 @@ void do_text(Context ctx, int x, int y, char *text, int len,
 static pascal void do_text_for_device(short depth, short devflags,
 				      GDHandle device, long cookie) {
     struct do_text_args *a;
-    int bgcolour, fgcolour, bright;
+    int bgcolour, fgcolour, bright, reverse, tmp;
 
     a = (struct do_text_args *)cookie;
 
     bright = (a->attr & ATTR_BOLD) && a->s->cfg.bold_colour;
+    reverse = a->attr & ATTR_REVERSE;
 
-    TextMode(a->attr & ATTR_REVERSE ? notSrcCopy : srcCopy);
+    if (depth == 1 && (a->attr & TATTR_ACTCURS))
+	reverse = !reverse;
 
-    switch (depth) {
-      case 1:
-	/* XXX This should be done with a _little_ more configurability */
-	ForeColor(whiteColor);
-	BackColor(blackColor);
-	if (a->attr & TATTR_ACTCURS)
-	    TextMode(a->attr & ATTR_REVERSE ? srcCopy : notSrcCopy);
-	break;
-      case 2:
-	if (a->attr & TATTR_ACTCURS) {
-	    PmForeColor(CURSOR_FG);
-	    PmBackColor(CURSOR_BG);
-	    TextMode(srcCopy);
-	} else {
-	    PmForeColor(bright ? DEFAULT_FG_BOLD : DEFAULT_FG);
-	    PmBackColor(DEFAULT_BG);
-	}
-	break;
-      default:
-	if (a->attr & TATTR_ACTCURS) {
-	    fgcolour = CURSOR_FG;
-	    bgcolour = CURSOR_BG;
-	    TextMode(srcCopy);
-	} else {
+    if (HAVE_COLOR_QD()) {
+	if (depth > 2) {
 	    fgcolour = ((a->attr & ATTR_FGMASK) >> ATTR_FGSHIFT) * 2;
 	    bgcolour = ((a->attr & ATTR_BGMASK) >> ATTR_BGSHIFT) * 2;
-	    if (bright)
-		if (a->attr & ATTR_REVERSE)
-		    bgcolour++;
-		else
-		    fgcolour++;
+	} else {
+	    /*
+	     * NB: bold reverse in 2bpp breaks with the usual PuTTY model and
+	     * boldens the background, because that's all we can do.
+	     */
+	    fgcolour = bright ? DEFAULT_FG_BOLD : DEFAULT_FG;
+	    bgcolour = DEFAULT_BG;
+	}
+	if (reverse) {
+	    tmp = fgcolour;
+	    fgcolour = bgcolour;
+	    bgcolour = tmp;
+	}
+	if (bright && depth > 2)
+	    fgcolour++;
+	if ((a->attr & TATTR_ACTCURS) && depth > 1) {
+	    fgcolour = CURSOR_FG;
+	    bgcolour = CURSOR_BG;
 	}
 	PmForeColor(fgcolour);
 	PmBackColor(bgcolour);
-	break;
+    } else { /* No Color Quickdraw */
+	/* XXX This should be done with a _little_ more configurability */
+	if (reverse) {
+	    ForeColor(blackColor);
+	    BackColor(whiteColor);
+	} else {
+	    ForeColor(whiteColor);
+	    BackColor(blackColor);
+	}
     }
 
-    if (a->attr & ATTR_REVERSE)
-	PaintRect(&a->leadrect);
-    else
-	EraseRect(&a->leadrect);
+    EraseRect(&a->textrect);
     MoveTo(a->textrect.left, a->textrect.top + a->s->font_ascent);
     /* FIXME: Sort out bold width adjustments on Original QuickDraw. */
     DrawText(a->text, 0, a->len);