add some macros for usefulness

SVN revision: 34165

src/bin/e.h

@@ -140,6 +140,32 @@ typedef struct _E_Rect E_Rect;
   while (0)
 
 #define E_CLAMP(x, min, max) (x < min ? min : (x > max ? max : x))
+#define E_RECTS_CLIP_TO_RECT(_x, _y, _w, _h, _cx, _cy, _cw, _ch) \
+   { \
+      if (E_INTERSECTS(_x, _y, _w, _h, _cx, _cy, _cw, _ch)) \
+	{ \
+	   if (_x < (_cx)) \
+	     { \
+		_w += _x - (_cx); \
+		_x = (_cx); \
+		if (_w < 0) _w = 0; \
+	     } \
+	   if ((_x + _w) > ((_cx) + (_cw))) \
+	     _w = (_cx) + (_cw) - _x; \
+	   if (_y < (_cy)) \
+	     { \
+		_h += _y - (_cy); \
+		_y = (_cy); \
+		if (_h < 0) _h = 0; \
+	     } \
+	   if ((_y + _h) > ((_cy) + (_ch))) \
+	     _h = (_cy) + (_ch) - _y; \
+	} \
+      else \
+	{ \
+	   _w = 0; _h = 0; \
+	} \
+   }
 
 #define E_REMOTE_OPTIONS 1
 #define E_REMOTE_OUT     2