Re: [ft-devel] Determining Upper Bound of memory consumption for a system using FT cache subsystem

[David Turner]

I think you are misunderstood. The cache subsystem memory bounding only accounts for the objects stored in the cache itself (i.e. glyph outlines, bitmaps, charmaps), but not the FT_Face and FT_Size objects themselves. Iirc, you can purge the latter if you want without purging the cache objects themselves.

Trying to memory-bound the FT_Face and FT_Size objects themselves is pretty impossible due to the nature of the font format we're trying to support.

Also, the memory bounding does not account for malloc-specific memory block padding and other stuff like that, so even getting an absolutely correct estimates of all the bytes consumed is impossible.

Hope this helps.

- David Turner

2010/3/10 Maggy Anastasia <address@hidden>

Dear FreeType Developers,

I have a few questions regarding freetype memory consumption upper bound; I am using Freetyper version 2.3.7

(1) static array: currently we know that all memory consumption by freetype is done through malloc calls and its variants. However, is there any other memory used in freetype, such as global arrays, which are used for memory allocation? If so, do they need any kind of configuration?

(2) Is there a way for determining the upper bound of memory usage for freetype when cache is being used. I know that we can set the upper bound for cache nodes (glyph image, cmap, sbitchace, etc.), but is there a way to determine the memory consumption for FT_FACE and FT_SIZE? From what I have seen regarding this, we can only limit the number of FT_FACE and FT_SIZE; however, how to determine the memory requirements for a given number of allowable FT_FACE and FT_SIZE. I am using freetype for an embedded system at the moment, thus, memory is really a constraint, and it's very important for me to be able to determine the size of the heap.


best regards

Maggy Anastasia Suryanto

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