message: Fix double definitions, correct comment.
diff: @@ -263,7 +263,7 @@ protected:
  (p0) = sum + (rect).x + (step) * (rect).y, \
  /* (x + w, y) */ \
  (p1) = sum + (rect).x + (rect).width + (step) * (rect).y, \
  - /* (x + w, y) */ \
  + /* (x, y + h) */ \
  (p2) = sum + (rect).x + (step) * ((rect).y + (rect).height), \
  /* (x + w, y + h) */ \
  (p3) = sum + (rect).x + (rect).width + (step) * ((rect).y + (rect).height)
  @@ -289,7 +289,7 @@ protected:
  (p0) = sum + (rect).x + (step) * (rect).y, \
  /* (x + w, y) */ \
  (p1) = sum + (rect).x + (rect).width + (step) * (rect).y, \
  -/* (x + w, y) */ \
  +/* (x, y + h) */ \
  (p2) = sum + (rect).x + (step) * ((rect).y + (rect).height), \
  /* (x + w, y + h) */ \
  (p3) = sum + (rect).x + (rect).width + (step) * ((rect).y + (rect).height)
  @@ -305,11 +305,6 @@ protected:
  (p3) = tilted + (rect).x + (rect).width - (rect).height \
  + (step) * ((rect).y + (rect).width + (rect).height)
  -#define CALC_SUM_(p0, p1, p2, p3, offset) \
  -((p0)[offset] - (p1)[offset] - (p2)[offset] + (p3)[offset])
  -
  -#define CALC_SUM(rect,offset) CALC_SUM_((rect)[0], (rect)[1], (rect)[2], (rect)[3], offset)
  -
  #define CALC_SUM_OFS_(p0, p1, p2, p3, ptr) \
  ((ptr)[p0] - (ptr)[p1] - (ptr)[p2] + (ptr)[p3])
  