Fix [9e31fd9449]: X11/X.h and Windows.h have conflicting symbols

*** POTENTIAL INCOMPATIBILITY *** for Win32 only: On X11 and Mac, "None" can still be used as before

3 files changed, 19 insertions, 15 deletions

diff --git a/xlib/X11/X.h b/xlib/X11/X.h
index daf2283..ad8f630 100644
--- a/xlib/X11/X.h
+++ b/xlib/X11/X.h
@@ -73,7 +73,9 @@ typedef unsigned long KeyCode;	/* In order to use IME, the Macintosh needs
  * RESERVED RESOURCE AND CONSTANT DEFINITIONS
  *****************************************************************/
 
-#define None                 0L	/* universal null resource or null atom */
+#ifndef _WIN32 /* prevent conflicting define against windows.h, bug [9e31fd9449] */
+#   define None              0L	/* universal null resource or null atom */
+#endif
 
 #define ParentRelative       1L	/* background pixmap in CreateWindow
 				    and ChangeWindowAttributes */
@@ -179,7 +181,9 @@ are reserved in the protocol for errors and replies. */
 
 #define ShiftMask		(1<<0)
 #define LockMask		(1<<1)
-#define ControlMask		(1<<2)
+#ifndef _WIN32 /* prevent conflicting define against windows.h, bug [9e31fd9449] */
+#   define ControlMask		(1<<2)
+#endif
 #define Mod1Mask		(1<<3)
 #define Mod2Mask		(1<<4)
 #define Mod3Mask		(1<<5)
@@ -294,7 +298,7 @@ are reserved in the protocol for errors and replies. */
 
 /* Used in SetInputFocus, GetInputFocus */
 
-#define RevertToNone		(int)None
+#define RevertToNone		0
 #define RevertToPointerRoot	(int)PointerRoot
 #define RevertToParent		2
 
diff --git a/xlib/xgc.c b/xlib/xgc.c
index 984c949..be66b21 100644
--- a/xlib/xgc.c
+++ b/xlib/xgc.c
@@ -50,7 +50,7 @@
 static TkpClipMask *AllocClipMask(GC gc) {
     TkpClipMask *clip_mask = (TkpClipMask*) gc->clip_mask;
 
-    if (clip_mask == None) {
+    if (!clip_mask) {
 	clip_mask = ckalloc(sizeof(TkpClipMask));
 	gc->clip_mask = (Pixmap) clip_mask;
 #ifdef MAC_OSX_TK
@@ -78,14 +78,14 @@ static TkpClipMask *AllocClipMask(GC gc) {
  */
 
 static void FreeClipMask(GC gc) {
-    if (gc->clip_mask != None) {
+    if (gc->clip_mask) {
 #ifdef MAC_OSX_TK
 	if (((TkpClipMask*) gc->clip_mask)->type == TKP_CLIP_REGION) {
 	    TkpReleaseRegion(((TkpClipMask*) gc->clip_mask)->value.region);
 	}
 #endif
 	ckfree(gc->clip_mask);
-	gc->clip_mask = None;
+	gc->clip_mask = 0;
     }
 }
 
@@ -125,7 +125,7 @@ XCreateGC(
 
     gp = ckalloc(sizeof(XGCValues) + MAX_DASH_LIST_SIZE + gcCacheSize);
     if (!gp) {
-	return None;
+	return 0;
     }
 
 #define InitField(name,maskbit,default) \
@@ -144,11 +144,11 @@ XCreateGC(
     InitField(fill_style,	  GCFillStyle,		FillSolid);
     InitField(fill_rule,	  GCFillRule,		WindingRule);
     InitField(arc_mode,		  GCArcMode,		ArcPieSlice);
-    InitField(tile,		  GCTile,		None);
-    InitField(stipple,		  GCStipple,		None);
+    InitField(tile,		  GCTile,		0);
+    InitField(stipple,		  GCStipple,		0);
     InitField(ts_x_origin,	  GCTileStipXOrigin,	0);
     InitField(ts_y_origin,	  GCTileStipYOrigin,	0);
-    InitField(font,		  GCFont,		None);
+    InitField(font,		  GCFont,		0);
     InitField(subwindow_mode,	  GCSubwindowMode,	ClipByChildren);
     InitField(graphics_exposures, GCGraphicsExposures,	True);
     InitField(clip_x_origin,	  GCClipXOrigin,	0);
@@ -157,7 +157,7 @@ XCreateGC(
     InitField(dashes,		  GCDashList,		4);
     (&(gp->dashes))[1] = 0;
 
-    gp->clip_mask = None;
+    gp->clip_mask = 0;
     if (mask & GCClipMask) {
 	TkpClipMask *clip_mask = AllocClipMask(gp);
 
@@ -268,7 +268,7 @@ int XFreeGC(
     Display *d,
     GC gc)
 {
-    if (gc != None) {
+    if (gc) {
 	FreeClipMask(gc);
 	TkpFreeGCCache(gc);
 	ckfree(gc);
@@ -464,7 +464,7 @@ TkSetRegion(
     GC gc,
     TkRegion r)
 {
-    if (r == None) {
+    if (!r) {
 	Tcl_Panic("must not pass None to TkSetRegion for compatibility with X11; use XSetClipMask instead");
     } else {
 	TkpClipMask *clip_mask = AllocClipMask(gc);
@@ -483,7 +483,7 @@ XSetClipMask(
     GC gc,
     Pixmap pixmap)
 {
-    if (pixmap == None) {
+    if (!pixmap) {
 	FreeClipMask(gc);
     } else {
 	TkpClipMask *clip_mask = AllocClipMask(gc);
diff --git a/xlib/ximage.c b/xlib/ximage.c
index aaab946..f7bf1cc 100644
--- a/xlib/ximage.c
+++ b/xlib/ximage.c
@@ -47,7 +47,7 @@ XCreateBitmapFromData(
     pix = Tk_GetPixmap(display, d, (int) width, (int) height, 1);
     gc = XCreateGC(display, pix, 0, NULL);
     if (gc == NULL) {
-	return None;
+	return 0;
     }
     ximage = XCreateImage(display, NULL, 1, XYBitmap, 0, (char*) data, width,
 	    height, 8, (width + 7) / 8);