Lots of small changes, all for UI in Blender;

----- Killed UI frontbuffer draw
The interface toolkit was drawing all live updates (while using menus/buttons)
in the frontbuffer. This isn't well supported cross-platform, so time to be
killed once. Now it uses *only* glReadPixels and glCopyPixels for frontbuffer
access.

Live updates or menus now are drawn in backbuffer always, and copied to
front when needed.

NOTE: it was tested, but needs thorough review! On PC systems I suspects
backbuffer selection to screw up (check!). On SGI/SUN workstations it
should work smooth; but I need evidence

----- Smaller fixes;

- AA fonts were garbled on ATI systems. Now the AA fonts are drawn exact
  on pixel positions. Needs the new FTGL libb too, patch is on maillist
- Rounded theme uses antialiased outlines
- Pulldown and popup menus have nice softshadow now
- New button type 'PULLDOWN', thats the one that callsup a pulldown menu.
  Should be added to themes, as is the full menu/pulldown drawing
- Screendump for 1 window does the full window now, including header
- Empty pulldowns (for example running blender without scripts) give no
  drawing error anymore

For review & fun;
- added curved lines as connectors, for Oops window

source/blender/include/interface.h

@@ -51,9 +51,8 @@
 /* warn: rest of uiBut->flag in BIF_interface.c */
 
 
-/* block->frontbuf: (only internal here), to nice localize the old global var uiFrontBuf */
-#define UI_NEED_DRAW_FRONT 		1
-#define UI_HAS_DRAW_FRONT 		2
+/* block->frontbuf: (only internal here). this signals something was drawn, for flush */
+#define UI_HAS_DRAWN 	1
 
 
 /* internal panel drawing defines */
@@ -141,7 +140,7 @@ struct uiBut {
 	BIFIconID icon;
 	short but_align;	/* aligning buttons, horiz/vertical */
 	short lock, win;
-	short iconadd;
+	short iconadd, dt;
 
 		/* IDPOIN data */
 	uiIDPoinFuncFP idpoin_func;
@@ -187,34 +186,41 @@ struct uiBlock {
 	int afterval, flag;
 	void *curfont;
 	
-	short autofill, win, winq, direction, dt, frontbuf, auto_open;  //frontbuf see below
-	void *saveunder;
+	short autofill, win, winq, direction, dt, frontbuf, auto_open, pad;  //frontbuf see below
+	void *overdraw;
 	
 	float xofs, yofs;  	// offset to parent button
 	rctf parentrct;		// for pulldowns, rect the mouse is allowed outside of menu (parent button)
 	rctf safety;		// pulldowns, to detect outside, can differ per case how it is created
 	
+	rctf flush;			// rect to be flushed to frontbuffer
 	int handler;		// for panels in other windows than buttonswin... just event code
 };
 
 /* interface.c */
+
+extern void ui_graphics_to_window(int win, float *x, float *y);
+extern void ui_window_to_graphics(int win, float *x, float *y);
+
+extern void ui_block_flush_back(uiBlock *block);
+extern void ui_block_set_flush(uiBlock *block, uiBut *but);
+
 extern void ui_check_but(uiBut *but);
 extern double ui_get_but_val(uiBut *but);
 extern void ui_get_but_vectorf(uiBut *but, float *vec);
 extern void ui_set_but_vectorf(uiBut *but, float *vec);
 extern void ui_autofill(uiBlock *block);
-extern void ui_graphics_to_window(int win, float *x, float *y);
-extern void ui_window_to_graphics(int win, float *x, float *y);
 
 /* interface_panel.c */
 extern void ui_draw_panel(uiBlock *block);
 extern void ui_do_panel(uiBlock *block, uiEvent *uevent);
 extern void gl_round_box(int mode, float minx, float miny, float maxx, float maxy, float rad);
-extern void gl_round_box_shade(int mode, float minx, float miny, float maxx, float maxy, float rad, float shade);
+extern void gl_round_box_shade(int mode, float minx, float miny, float maxx, float maxy, float rad, float shadetop, float shadedown);
 
 /* interface_draw.c */
 extern void ui_set_embossfunc(uiBut *but, int drawtype);
 extern void ui_draw_but(uiBut *but);
+extern void ui_rasterpos_safe(float x, float y, float aspect);
 
 
 #endif