three things:

- ALT+Scrollwheel zooms backdrop in node editor
- Blender -d debug print will also print every event except mouse moves
  (needed to debug WM, some events are catched by OS)
- Changed order of keymaps... the default maps now are evaluated *after*
  the own custom maps, so you can make overrides or defaults.

source/blender/editors/screen/area.c

@@ -893,22 +893,22 @@ void ED_area_initialize(wmWindowManager *wm, wmWindow *win, ScrArea *sa)
 	rect= sa->totrct;
 	region_rect_recursive(sa, sa->regionbase.first, &rect, 0);
 	
-	/* default area handlers */
-	ed_default_handlers(wm, &sa->handlers, sa->type->keymapflag);
 	/* checks spacedata, adds own handlers */
 	if(sa->type->init)
 		sa->type->init(wm, sa);
+	/* default area handlers */
+	ed_default_handlers(wm, &sa->handlers, sa->type->keymapflag);
 	
 	/* region windows, default and own handlers */
 	for(ar= sa->regionbase.first; ar; ar= ar->next) {
 		region_subwindow(wm, win, ar);
 		
 		if(ar->swinid) {
-			/* default region handlers */
-			ed_default_handlers(wm, &ar->handlers, ar->type->keymapflag);
-
+			/* own handlers */
 			if(ar->type->init)
 				ar->type->init(wm, ar);
+			/* default region handlers */
+			ed_default_handlers(wm, &ar->handlers, ar->type->keymapflag);
 		}
 		else {
 			/* prevent uiblocks to run */

source/blender/editors/space_node/drawnode.c

@@ -1293,14 +1293,17 @@ void draw_nodespace_back_pix(ARegion *ar, SpaceNode *snode, int color_manage)
 			glMatrixMode(GL_MODELVIEW);
 			glPushMatrix();
 
+			/* keep this, saves us from a version patch */
+			if(snode->zoom==0.0f) snode->zoom= 1.0f;
+			
 			/* somehow the offset has to be calculated inverse */
 			
 			glaDefine2DArea(&ar->winrct);
 			/* ortho at pixel level curarea */
 			wmOrtho2(-0.375, ar->winx-0.375, -0.375, ar->winy-0.375);
 			
-			x = (ar->winx-ibuf->x)/2 + snode->xof;
-			y = (ar->winy-ibuf->y)/2 + snode->yof;
+			x = (ar->winx-snode->zoom*ibuf->x)/2 + snode->xof;
+			y = (ar->winy-snode->zoom*ibuf->y)/2 + snode->yof;
 			
 			if(!ibuf->rect) {
 				if(color_manage)
@@ -1310,8 +1313,11 @@ void draw_nodespace_back_pix(ARegion *ar, SpaceNode *snode, int color_manage)
 				IMB_rect_from_float(ibuf);
 			}
 
-			if(ibuf->rect)
+			if(ibuf->rect) {
+				glPixelZoom(snode->zoom, snode->zoom);
 				glaDrawPixelsSafe(x, y, ibuf->x, ibuf->y, ibuf->x, GL_RGBA, GL_UNSIGNED_BYTE, ibuf->rect);
+				glPixelZoom(1.0f, 1.0f);
+			}
 			
 			glMatrixMode(GL_PROJECTION);
 			glPopMatrix();

source/blender/editors/space_node/node_edit.c

@@ -775,6 +775,37 @@ void NODE_OT_backimage_move(wmOperatorType *ot)
 	ot->flag= OPTYPE_BLOCKING;
 }
 
+static int backimage_zoom(bContext *C, wmOperator *op)
+{
+	SpaceNode *snode= CTX_wm_space_node(C);
+	ARegion *ar= CTX_wm_region(C);
+	float fac= RNA_float_get(op->ptr, "factor");
+
+	snode->zoom *= fac;
+	ED_region_tag_redraw(ar);
+
+	return OPERATOR_FINISHED;
+}
+
+
+void NODE_OT_backimage_zoom(wmOperatorType *ot)
+{
+	
+	/* identifiers */
+	ot->name= "Background Image Zoom";
+	ot->idname= "NODE_OT_backimage_zoom";
+	
+	/* api callbacks */
+	ot->exec= backimage_zoom;
+	ot->poll= ED_operator_node_active;
+	
+	/* flags */
+	ot->flag= OPTYPE_BLOCKING;
+
+	/* internal */
+	RNA_def_float(ot->srna, "factor", 1.2f, 0.0f, 10.0f, "Factor", "", 0.0f, 10.0f);
+}
+
 
 /* ********************** size widget operator ******************** */
 

source/blender/editors/space_node/node_intern.h

@@ -106,6 +106,7 @@ void NODE_OT_link_viewer(struct wmOperatorType *ot);
 void NODE_OT_read_fullsamplelayers(struct wmOperatorType *ot);
 void NODE_OT_read_renderlayers(struct wmOperatorType *ot);
 void NODE_OT_backimage_move(struct wmOperatorType *ot);
+void NODE_OT_backimage_zoom(struct wmOperatorType *ot);
 
 // XXXXXX
 

source/blender/editors/space_node/node_ops.c

@@ -76,6 +76,7 @@ void node_operatortypes(void)
 	WM_operatortype_append(NODE_OT_read_fullsamplelayers);
 	
 	WM_operatortype_append(NODE_OT_backimage_move);
+	WM_operatortype_append(NODE_OT_backimage_zoom);
 }
 
 void ED_operatormacros_node(void)
@@ -125,6 +126,11 @@ void node_keymap(struct wmKeyConfig *keyconf)
 	WM_keymap_add_item(keymap, "NODE_OT_select_link_viewer", LEFTMOUSE, KM_PRESS, KM_SHIFT|KM_CTRL, 0);
 	
 	WM_keymap_add_item(keymap, "NODE_OT_backimage_move", MIDDLEMOUSE, KM_PRESS, KM_ALT, 0);
+	kmi= WM_keymap_add_item(keymap, "NODE_OT_backimage_zoom", WHEELOUTMOUSE, KM_PRESS, KM_ALT, 0);
+		RNA_float_set(kmi->ptr, "factor", 0.83333f);
+	kmi= WM_keymap_add_item(keymap, "NODE_OT_backimage_zoom", WHEELINMOUSE, KM_PRESS, KM_ALT, 0);
+		RNA_float_set(kmi->ptr, "factor", 1.2f);
+	
 	
 	WM_keymap_add_item(keymap, "NODE_OT_link_make", FKEY, KM_PRESS, 0, 0);
 	RNA_boolean_set(WM_keymap_add_item(keymap, "NODE_OT_link_make", FKEY, KM_PRESS, KM_CTRL, 0)->ptr, "replace", 1);

source/blender/makesdna/DNA_space_types.h

@@ -373,8 +373,9 @@ typedef struct SpaceNode {
 	float aspect;
 	void *curfont;
 	
-	float xof, yof;	/* offset for drawing the backdrop */
-	float mx, my;	/* mousepos for drawing socketless link */
+	float xof, yof;		/* offset for drawing the backdrop */
+	float zoom, padf;	/* zoom for backdrop */
+	float mx, my;		/* mousepos for drawing socketless link */
 	
 	struct bNodeTree *nodetree, *edittree;
 	int treetype;			/* treetype: as same nodetree->type */

source/blender/windowmanager/intern/wm_event_system.c

@@ -1582,6 +1582,9 @@ void wm_event_do_handlers(bContext *C)
 		while( (event= win->queue.first) ) {
 			int action = WM_HANDLER_CONTINUE;
 
+			if((G.f & G_DEBUG) && event && event->type!=MOUSEMOVE)
+				printf("pass on evt %d val %d\n", event->type, event->val); 
+			
 			wm_eventemulation(event);
 
 			CTX_wm_window_set(C, win);