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| DATE | 2021-08-30 |
| FROM | Lee Shallis
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| SUBJECT | Subject: [Learn] [png-mng-implement] Own implementation loader/renderer
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From: Lee Shallis
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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Subject: [Learn] [png-mng-implement] Own implementation loader/renderer
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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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