evas render 2 - tiled rouding of updates to keep number regions down

tile to 16x16 (we can cahnge) to keep number of update rects
down/minimal with render2

src/lib/evas/canvas/render2/evas_render2_th_main.c

@@ -167,6 +167,30 @@ _evas_render2_th_main_obj_process(Evas_Public_Data *e,
                                                 offx, offy, l);
 }
 
+static Region *
+_evas_render2_regions_merge(Region *region)
+{
+   Region *region2;
+   Box *rects;
+   int num, i;
+   int tsize = 16;
+
+   region2 = region_new();
+   rects = region_rects(region);
+   num = region_rects_num(region);
+   for (i = 0; i < num; i++)
+     {
+        region_rect_add
+        (region2,
+         (rects[i].x1 / tsize) * tsize,
+         (rects[i].y1 / tsize) * tsize,
+         (((rects[i].x2 - rects[i].x1) + tsize - 1) / tsize) * tsize,
+         (((rects[i].y2 - rects[i].y1) + tsize - 1) / tsize) * tsize);
+     }
+   region_free(region);
+   return region2;
+}
+
 static void
 _evas_render2_th_main_do(Eo *eo_e, Evas_Public_Data *e)
 {
@@ -207,6 +231,8 @@ _evas_render2_th_main_do(Eo *eo_e, Evas_Public_Data *e)
    t = get_time() - t;
    printf("T: update generation: "); out_time(t);
 
+   updates = _evas_render2_regions_merge(updates);
+
    rects = region_rects(updates);
    rects_num = region_rects_num(updates);
    for (i = 0; i < rects_num; i++)
@@ -214,6 +240,8 @@ _evas_render2_th_main_do(Eo *eo_e, Evas_Public_Data *e)
         rect = malloc(sizeof(Eina_Rectangle));
         if (rect)
           {
+             if (rects[i].x2 > e->output.w) rects[i].x2 = e->output.w;
+             if (rects[i].y2 > e->output.h) rects[i].y2 = e->output.h;
              rect->x = rects[i].x1;
              rect->y = rects[i].y1;
              rect->w = rects[i].x2 - rects[i].x1;
@@ -223,6 +251,10 @@ _evas_render2_th_main_do(Eo *eo_e, Evas_Public_Data *e)
              updates_list = eina_list_append(updates_list, rect);
           }
      }
+   t = get_time() - t;
+   printf("T: merge updates: "); out_time(t);
+
+   // ... now render every update region
    region_free(updates);
 
    e->changed = EINA_FALSE;

src/lib/evas/canvas/render2/region.c

@@ -744,8 +744,6 @@ region_rects(Region *region)
 Eina_Bool
 region_copy(Region *dest, Region *src)
 {
-   if (dest == src) return EINA_TRUE;
-
    dest->last_del.w = 0;
    dest->last_add.w = 0;
 
@@ -827,9 +825,6 @@ region_add(Region *dest, Region *source)
    // Return EINA_TRUE if some overlap between dest, source
    // checks all the simple cases
 
-   // Region 1 and 2 are the same
-   if (dest == source) return region_copy(dest, dest);
-
    dest->last_del.w = 0;
    dest->last_add.w = 0;
 
@@ -1343,7 +1338,7 @@ region_point_inside(Region *region, int x, int y, Box *box)
    if ((!num) || (!INBOX(&region->bound, x, y))) return EINA_FALSE;
    if (num == 1)
      {
-        *box = region->bound;
+        if (box) *box = region->bound;
         return EINA_TRUE;
      }
    for (bx = PIXREGION_BOXPTR(region), bxend = bx + num; bx != bxend; bx++)
@@ -1351,7 +1346,7 @@ region_point_inside(Region *region, int x, int y, Box *box)
         if (y >= bx->y2) continue; // not there yet
         if ((y < bx->y1) || (x < bx->x1)) break; // missed it
         if (x >= bx->x2) continue; // not there yet
-        *box = *bx;
+        if (box) *box = *bx;
         return EINA_TRUE;
      }
    return EINA_FALSE;
@@ -1370,6 +1365,8 @@ region_empty(Region *region)
    region->bound.x2 = region->bound.x1;
    region->bound.y2 = region->bound.y1;
    region->data = &_region_emptydata;
+   region->last_del.w = 0;
+   region->last_add.w = 0;
 }
 
 Box *