97 lines
2.9 KiB
Plaintext
97 lines
2.9 KiB
Plaintext
Change the font lookup algorithm to prefer non-scalable fonts when they
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are available. The original algorithm came up with some really ugly
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scaled fonts sometimes, even when an equally suitable unscaled
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alternative was available.
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===================================================================
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RCS file: /home/jdp/m3-cvs/m3/ui/src/xvbt/XScrnFont.m3,v
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retrieving revision 1.1.1.1
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diff -u -r1.1.1.1 XScrnFont.m3
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--- m3/ui/src/xvbt/XScrnFont.m3.orig 1996/09/24 05:22:01 1.1.1.1
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+++ m3/ui/src/xvbt/XScrnFont.m3 1996/09/24 05:32:38
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@@ -193,12 +193,16 @@
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PROCEDURE FontLookup (orc: FontOracle; name: TEXT): ScrnFont.T
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RAISES {ScrnFont.Failure, TrestleComm.Failure} =
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- VAR s: Ctypes.char_star;
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+ VAR
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+ s: Ctypes.char_star;
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+ uname: TEXT;
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BEGIN
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TRY
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TrestleOnX.Enter(orc.st.trsl);
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TRY
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- s := M3toC.TtoS(name);
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+ uname := FindUnscaled(orc.st.trsl.dpy, name); (* Prefer unscaled font *)
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+ IF uname = NIL THEN uname := name END;
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+ s := M3toC.TtoS(uname);
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VAR xfs := X.XLoadQueryFont(orc.st.trsl.dpy, s);
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BEGIN
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IF xfs = NIL THEN RAISE ScrnFont.Failure END;
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@@ -209,6 +213,65 @@
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END;
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EXCEPT X.Error => RAISE TrestleComm.Failure END;
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END FontLookup;
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+
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+PROCEDURE FindUnscaled(dpy: X.DisplayStar; pat: TEXT): TEXT RAISES {X.Error} =
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+ (* Return the first matching unscaled font, if any. Otherwise return NIL. *)
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+ VAR
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+ s := M3toC.TtoS(pat);
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+ xcount: Ctypes.int;
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+ fonts := X.XListFonts(dpy, s, 32767, ADR(xcount));
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+ fp := fonts;
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+ count: INTEGER := xcount;
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+ xmatch: Ctypes.char_star := NIL;
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+ match: TEXT := NIL;
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+ BEGIN
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+ IF count = 0 THEN
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+ IF fonts # NIL THEN X.XFreeFontNames(fonts) END;
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+ RETURN NIL;
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+ END;
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+
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+ FOR i := 0 TO count - 1 DO (* Search for an unscaled font *)
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+ IF NOT IsScaled(M3toC.StoT(fp^)) THEN
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+ xmatch := fp^;
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+ EXIT;
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+ END;
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+ fp := fp + ADRSIZE(fp^);
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+ END;
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+
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+ IF xmatch # NIL THEN (* Found an unscaled font *)
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+ match := M3toC.CopyStoT(xmatch);
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+ END;
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+ X.XFreeFontNames(fonts);
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+ RETURN match;
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+ END FindUnscaled;
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+
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+PROCEDURE IsScaled(name: TEXT): BOOLEAN =
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+ (* Return true if font is scaled. *)
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+ VAR
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+ len := Text.Length(name);
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+ fieldNum := 0;
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+ found0 := FALSE;
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+ hyphenPos: INTEGER;
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+ BEGIN
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+ (* A font is scaled if:
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+ a. it is in canonical form (starts with '-', and all 14 XLFD fields
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+ are present), and
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+ b. any of the fields pixel size, point size, or average width is 0. *)
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+ hyphenPos := Text.FindChar(name, '-', 0);
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+ WHILE hyphenPos # -1 DO
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+ INC(fieldNum);
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+ IF fieldNum = 7 OR fieldNum = 8 OR fieldNum = 12 THEN
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+ IF hyphenPos+2 < len AND
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+ Text.GetChar(name, hyphenPos+1) = '0' AND
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+ Text.GetChar(name, hyphenPos+2) = '-' THEN
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+ found0 := TRUE;
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+ END;
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+ END;
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+ hyphenPos := Text.FindChar(name, '-', hyphenPos+1);
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+ END;
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+
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+ RETURN fieldNum = 14 AND Text.GetChar(name, 0) = '-' AND found0;
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+ END IsScaled;
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CONST
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BuiltInNames = ARRAY OF
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