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hawkfanxity
Known Participant
September 25, 2009
Question

Two different formats have the same hash

  • September 25, 2009
  • 1 reply
  • 531 views

Due to the poor performance of the equals as well as other optimization reasons we are using the tlf_internal hash function on TextLayoutFormat.  We have run into a couple issues where two different formats result in the same hash. 

One specific instance we have is one format being center aligned and font size of 11 and the other font is left aligned and font size of 10.  In stepping through the hash logic the hashes are different up until the point we get to textAlign and then they become the same.

The hash before the Center Align 11 is 2267941817 and after the hash on _textAlignProperty it is 440261119

The hash before the Left Align 10 is     2536377273 and after the hash on _textAlignProperty it is 440261119

Here are screen shots of both full formats:

Center Align 11

Left Align 10

This topic has been closed for replies.

1 reply

R
Adobe Employee
rdermer
Adobe Employee
September 25, 2009

The hash does not (and cannot) guarantee that two different formats will never have the same hash.  Suggest using it as a filter to see if you need to make the equals call.

Richard

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