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hb_face_create() with an empty blob #1572

khaledhosny opened this issue Feb 7, 2019 · 2 comments


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commented Feb 7, 2019

I was expecting the code below to print 1, but it prints 0; even though hb_face_create() is essentially returning an empty face, it is still not equal to hb_face_get_empty (). Is this expected?

#include <stdio.h>
#include <hb.h>

main (int argc, char** argv)
  printf("%d\n", hb_face_create (hb_blob_get_empty (), 0) == hb_face_get_empty ());

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commented Feb 8, 2019

It used to be that way, but I changed it, because, a face created using an empty blob can still be meaningfully used for certain tasks. The hb-fc-list does that I think. Whereas if we returned the empty face then it would be inert and refuse shaping with it.

I can't make up my mind, maybe creating a blob for zero bytes should also return a new instance instead of returning the nil instance.


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commented Feb 9, 2019

For my case, I was trying to catch for faces created from non-existing file. But I think what I actually need is a general check “is this an SFNT font” since that what I care about, and checking for table tags might be a more robust check for my specific case.

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