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DATE 2021-08-01

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MESSAGE
DATE 2021-08-30
FROM Lee Shallis
SUBJECT Subject: [Learn] [png-mng-implement] Own implementation loader/renderer
From learn-bounces-at-nylxs.com Mon Aug 30 10:47:48 2021
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Date: Mon, 30 Aug 2021 13:10:12 +0100
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Content preview: I've been implementing my own code for loading & rendering
PNGs, I've managed to get the filters correct for 8 bit values (or working
individually, or both) but when I went to test on a PNG made for 4 [...]
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I've been implementing my own code for loading & rendering PNGs, I've
managed to get the filters correct for 8 bit values (or working
individually, or both) but when I went to test on a PNG made for 4 bit
values and using all filters in one file I get a corrupted image that
resembles the target image, I've made a post about it here:

https://cboard.cprogramming.com/c-programming/180516-final-filter-test-failing-post1302846.html#post1302846

Since the other test images came out correctly I doubt it's my
implementation of zlib but it could also be that, either way I'd like
someone to take a look at my code here:

https://gitlab.com/awsdert/glengine/-/tree/main/view

And tell me if they see anything that would be a problem in regards
defiltering the data

Btw the images I'm currently testing with are here:

http://www.schaik.com/pngsuite/pngsuite_fil_png.html

The one that fails is just the last one that looks like a ball


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  1. 2021-08-26 From: "Pat Schloss" <pschloss-at-umich.edu> Subject: [Learn] [mothur] mothur v.1.46.0 release and other happenings
  2. 2021-08-30 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] [Hangout - NYLXS] Really we are reaching the end of
  3. 2021-08-30 Lee Shallis <gb2985-at-gmail.com> Subject: [Learn] [png-mng-implement] Own implementation loader/renderer

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