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fix color order in pixels access

--- a/pixels.c

+++ b/pixels.c

@@ -31,11 +31,11 @@

 	luaL_argcheck(L, 1 <= i && i <= (width*height), 2, "index out of range");

 	i = (i-1)*4;

 	lua_newtable(L);

-	lua_pushinteger(L, p->data[i]);

+	lua_pushinteger(L, p->data[i+2]);

 	lua_setfield(L, -2, "r");

 	lua_pushinteger(L, p->data[i+1]);

 	lua_setfield(L, -2, "g");

-	lua_pushinteger(L, p->data[i+2]);

+	lua_pushinteger(L, p->data[i+0]);

 	lua_setfield(L, -2, "b");

 	return 1;

 }

@@ -61,9 +61,9 @@

 	lua_gettable(L, 3);

 	b = luaL_checkinteger(L, -1);

 	i = (i-1)*4;

-	p->data[i + 0] = r;

+	p->data[i + 2] = r;

 	p->data[i + 1] = g;

-	p->data[i + 2] = b;

+	p->data[i + 0] = b;

 	return 0;

 }