4b505376cb
HWUI calculates the texture size as w*h*bpp. In some cases, the calculated path cache is small, but the actual memory allocated in driver is 4k/8k/16k, much bigger than HWUI calculates. Example: a 5*65 alpha texture, HWUI think it is 5*65*1 = 325 bytes, but driver allocates 8K. An app can allocates up to 32M path textures, which actually consumes 32M*(8*1024/325) = 806M memory. Here we limit the number of path texture in the cache to 256, it should be a pretty generous global limit. Change-Id: I890819b73bb0b7f63e96bc3d9d0ff9469c16838c