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== Handles As a general pattern, these libraries have an interface based on integer handles allocated by Open() and released by Close(); in the AliceSoft's implementation, handles are pointers to internal objects. Note that: * 0 is used to represent an invalid handle, and * Small numbers cannot be handles. For example, Mamanyonyo has code that treats an integer as a CG number if it is less than 10000, and as a surface handle otherwise. In this patch, handles are generated using id_pool.h functions. In order to achieve the above, the interface is extended so that the minimum ID value can be specified (the `base` parameter of id_pool_init()). == Graphics System Surface objects (implemented in vmSurface.[ch]) plays a central role in Mamanyonyo's graphics system, and the sprite system (vmSprite.c) is implemented on top of it. vmSprite.c uses scene.h functions. == vmChrLoader and vmMapLoader Since Mamanyonyo's character data format is the same as Widenyo's, the ChrLoader code has been refactored and used from vmChrLoader.c. On the other hand, MapLoader and vmMapLoader do not share code because the map file format is different from Widenyo.