Initial commit

.gitignore

@@ -0,0 +1 @@
+*~

README.md

@@ -0,0 +1,41 @@
+# Putty italics patch
+
+This repository contains a patch that enables italics in the Windows version
+of PuTTY.  Italics text was specified in ECMA-48 *in 1976*, yet terminal
+emulator support for it has only caught on somewhat recently.  Support
+exists in many libvte-based terminals, but to date it's not even on the
+[PuTTY wishlist](https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/).
+
+I'd like to eventually submit this patch upstream, however, it would likely
+require implementations for the other operating systems, and some fairly
+thorough testing before it would be accepted...
+
+## Screenshots
+
+### With italics
+
+![With Italics](https://raw.githubusercontent.com/jjjordan/putty-italics/master/screenshots/with-italics.png)
+*The [JOE Editor](https://sf.net/p/joe-editor) with the Zenburn color scheme*
+
+### Without italics
+
+![No Italics](https://raw.githubusercontent.com/jjjordan/putty-italics/master/screenshots/no-italics.png)
+
+### Font support
+
+The patch is a bit picky about which fonts it will allow.  Many monospaced
+fonts do not have a native italics face, and instead rely on the Operating
+System to apply a linear transformation for an "Oblique" face.  They wind up
+overhanging the next glyph and cause generally bad artifacts during
+painting.  For this reason, the patch rejects any font without a true
+Italics face.
+
+These fonts, however, are known to work:
+
+* [Anonymous Pro](https://www.marksimonson.com/fonts/view/anonymous-pro)
+* Consolas
+* Courier New
+* [Hack](http://sourcefoundry.org/hack/)
+* [Operator Mono](https://www.typography.com/fonts/operator/overview/)
+* [Ubuntu Mono](http://font.ubuntu.com/)
+

italics-0.70.patch

@@ -0,0 +1,203 @@
+diff -ruN putty-0.70-orig/putty.h putty-0.70/putty.h
+--- putty-0.70-orig/putty.h	2017-07-04 12:30:55.000000000 -0700
++++ putty-0.70/putty.h	2017-09-17 23:27:25.855665600 -0700
+@@ -104,6 +104,7 @@
+  */
+ #define UCSWIDE	     0xDFFF
+
++#define ATTR_ITALIC  0x1000000U
+ #define ATTR_NARROW  0x800000U
+ #define ATTR_WIDE    0x400000U
+ #define ATTR_BOLD    0x040000U
+diff -ruN putty-0.70-orig/terminal.c putty-0.70/terminal.c
+--- putty-0.70-orig/terminal.c	2017-07-04 12:30:55.000000000 -0700
++++ putty-0.70/terminal.c	2017-09-17 23:43:56.100304300 -0700
+@@ -3804,6 +3804,10 @@
+ 				    compatibility(VT100AVO);
+ 				    term->curr_attr |= ATTR_BOLD;
+ 				    break;
++				  case 3:	/* enable italics */
++				    compatibility(ANSI);
++				    term->curr_attr |= ATTR_ITALIC;
++				    break;
+ 				  case 21:	/* (enable double underline) */
+ 				    compatibility(OTHER);
+ 				  case 4:	/* enable underline */
+@@ -3839,6 +3843,10 @@
+ 				    compatibility2(OTHER, VT220);
+ 				    term->curr_attr &= ~ATTR_BOLD;
+ 				    break;
++				  case 23:	/* disable italics */
++				    compatibility(ANSI);
++				    term->curr_attr &= ~ATTR_ITALIC;
++				    break;
+ 				  case 24:	/* disable underline */
+ 				    compatibility2(OTHER, VT220);
+ 				    term->curr_attr &= ~ATTR_UNDER;
+diff -ruN putty-0.70-orig/windows/window.c putty-0.70/windows/window.c
+--- putty-0.70-orig/windows/window.c	2017-07-04 12:30:56.000000000 -0700
++++ putty-0.70/windows/window.c	2017-09-18 00:23:13.041113600 -0700
+@@ -171,17 +171,18 @@
+ #define FONT_BOLD 1
+ #define FONT_UNDERLINE 2
+ #define FONT_BOLDUND 3
+-#define FONT_WIDE	0x04
+-#define FONT_HIGH	0x08
+-#define FONT_NARROW	0x10
+-
+-#define FONT_OEM 	0x20
+-#define FONT_OEMBOLD 	0x21
+-#define FONT_OEMUND 	0x22
+-#define FONT_OEMBOLDUND 0x23
++#define FONT_ITALIC 4
++#define FONT_WIDE	0x08
++#define FONT_HIGH	0x10
++#define FONT_NARROW	0x20
++
++#define FONT_OEM 	0x40
++#define FONT_OEMBOLD 	0x41
++#define FONT_OEMUND 	0x42
++#define FONT_OEMBOLDUND 0x43
+
+-#define FONT_MAXNO 	0x40
+-#define FONT_SHIFT	5
++#define FONT_MAXNO 	0x4F
++#define FONT_SHIFT	6
+ static HFONT fonts[FONT_MAXNO];
+ static LOGFONT lfont;
+ static int fontflag[FONT_MAXNO];
+@@ -193,6 +194,7 @@
+     UND_LINE, UND_FONT
+ } und_mode;
+ static int descent;
++static int use_italics;
+
+ #define NCFGCOLOURS 22
+ #define NEXTCOLOURS 240
+@@ -1494,13 +1496,13 @@
+     font_width = pick_width;
+
+     quality = conf_get_int(conf, CONF_font_quality);
+-#define f(i,c,w,u) \
+-    fonts[i] = CreateFont (font_height, font_width, 0, 0, w, FALSE, u, FALSE, \
++#define f(i,c,w,u,t) \
++    fonts[i] = CreateFont (font_height, font_width, 0, 0, w, t, u, FALSE, \
+ 			   c, OUT_DEFAULT_PRECIS, \
+ 		           CLIP_DEFAULT_PRECIS, FONT_QUALITY(quality), \
+ 			   FIXED_PITCH | FF_DONTCARE, font->name)
+
+-    f(FONT_NORMAL, font->charset, fw_dontcare, FALSE);
++    f(FONT_NORMAL, font->charset, fw_dontcare, FALSE, FALSE);
+
+     SelectObject(hdc, fonts[FONT_NORMAL]);
+     GetTextMetrics(hdc, &tm);
+@@ -1544,7 +1546,57 @@
+ 	ucsdata.dbcs_screenfont = (cpinfo.MaxCharSize > 1);
+     }
+
+-    f(FONT_UNDERLINE, font->charset, fw_dontcare, TRUE);
++    /* Check whether italic face is acceptable... */
++    f(FONT_ITALIC, font->charset, fw_dontcare, FALSE, TRUE);
++
++    {
++	LPOUTLINETEXTMETRICA regularOtm, italicOtm;
++
++	use_italics = 0;
++
++	i = GetOutlineTextMetricsA(hdc, 0, NULL);
++	if (i > 0) {
++	    regularOtm = (LPOUTLINETEXTMETRICA)safemalloc(1, i);
++	    regularOtm->otmSize = sizeof(OUTLINETEXTMETRICA);
++	    if (GetOutlineTextMetricsA(hdc, i, regularOtm)) {
++		/* Now get the italic version */
++		SelectObject(hdc, fonts[FONT_ITALIC]);
++		i = GetOutlineTextMetricsA(hdc, 0, NULL);
++		if (i > 0) {
++		    italicOtm = (LPOUTLINETEXTMETRICA)safemalloc(1, i);
++		    italicOtm->otmSize = sizeof(OUTLINETEXTMETRICA);
++		    if (GetOutlineTextMetricsA(hdc, i, italicOtm)) {
++			/* Compare... */
++			char *regStyle = (char*)regularOtm + (int)regularOtm->otmpStyleName;
++			char *itaStyle = (char*)italicOtm + (int)italicOtm->otmpStyleName;
++
++			/* Weed out "italic" fonts that...
++			    - Do not specify an italic slant (probably just the regular font)
++			    - Have the same style as the regular font.  Then it *is* just the regular
++				font with a linear transformation.
++			    - Report the style name of "Oblique".
++			   
++			    My experience is these a) don't look very good b) tend to overhang the
++			    next character and get cut off during paints... which doesn't look very good. */
++			if (strcmp(regStyle, itaStyle) && stricmp(itaStyle, "Oblique") && italicOtm->otmItalicAngle != 0) {
++			    use_italics = 1;
++			}
++		    }
++
++		    safefree(italicOtm);
++		}
++	    }
++
++	    safefree(regularOtm);
++	}
++
++	if (!use_italics) {
++	    DeleteObject(fonts[FONT_ITALIC]);
++	    fonts[FONT_ITALIC] = NULL;
++	}
++    }
++
++    f(FONT_UNDERLINE, font->charset, fw_dontcare, TRUE, FALSE);
+
+     /*
+      * Some fonts, e.g. 9-pt Courier, draw their underlines
+@@ -1595,7 +1647,7 @@
+     }
+
+     if (bold_font_mode == BOLD_FONT) {
+-	f(FONT_BOLD, font->charset, fw_bold, FALSE);
++	f(FONT_BOLD, font->charset, fw_bold, FALSE, FALSE);
+     }
+ #undef f
+
+@@ -1636,7 +1688,7 @@
+ {
+     int basefont;
+     int fw_dontcare, fw_bold, quality;
+-    int c, u, w, x;
++    int c, u, w, x, t;
+     char *s;
+     FontSpec *font;
+
+@@ -1662,6 +1714,7 @@
+     u = FALSE;
+     s = font->name;
+     x = font_width;
++    t = FALSE;
+
+     if (fontno & FONT_WIDE)
+ 	x *= 2;
+@@ -1673,12 +1726,14 @@
+ 	w = fw_bold;
+     if (fontno & FONT_UNDERLINE)
+ 	u = TRUE;
++    if (fontno & FONT_ITALIC && use_italics)
++	t = TRUE;
+
+     quality = conf_get_int(conf, CONF_font_quality);
+
+     fonts[fontno] =
+ 	CreateFont(font_height * (1 + !!(fontno & FONT_HIGH)), x, 0, 0, w,
+-		   FALSE, u, FALSE, c, OUT_DEFAULT_PRECIS,
++		   t, u, FALSE, c, OUT_DEFAULT_PRECIS,
+ 		   CLIP_DEFAULT_PRECIS, FONT_QUALITY(quality),
+ 		   DEFAULT_PITCH | FF_DONTCARE, s);
+
+@@ -3498,6 +3553,8 @@
+ 	nfont |= FONT_BOLD;
+     if (und_mode == UND_FONT && (attr & ATTR_UNDER))
+ 	nfont |= FONT_UNDERLINE;
++    if (attr & ATTR_ITALIC)
++	nfont |= FONT_ITALIC;
+     another_font(nfont);
+     if (!fonts[nfont]) {
+ 	if (nfont & FONT_UNDERLINE)