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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    1. Casey Muratori‏ @cmuratori 24 Jun 2018

      PNG turned out to be pretty simple to parse directly from the specs. I was expecting much worse. Less than 12 hours on Handmade Hero, which includes all the time live coding, debugging, and all the explanations of everything as I did it:https://www.youtube.com/watch?v=lkEWbIUEuN0&list=PLEMXAbCVnmY5y4dSkKf297tJqwMxJOk7e …

      2 replies 6 retweets 72 likes
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    2. Casey Muratori‏ @cmuratori 24 Jun 2018

      Since live coding is usually a lot slower (and more error-prone) than regular coding, it seems like it might be reasonable to say that coding a PNG reader from scratch takes only about one work day of time, two at most, even if you have never looked at PNGs before (I had not).

      1 reply 3 retweets 19 likes
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    3. Casey Muratori‏ @cmuratori 24 Jun 2018

      However I would caveat that we didn't bother with multiple bit depths and index palettes, so it is definitely true that an extra day would probably be warranted if one wanted a complete PNG reader that did non-game-style PNGs (eg., not only true-color RGBA).

      3 replies 1 retweet 12 likes
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    4. richard cattermole‏ @rikkicattermole 24 Jun 2018
      Replying to @cmuratori

      The smaller bit depths combined with Adam7 cause some real problems for parsing and emitting. Took me a while to get mine to work (without the extra non-used chunks) and matching the test suite.

      1 reply 0 retweets 0 likes
      Casey Muratori‏ @cmuratori 24 Jun 2018
      Replying to @rikkicattermole

      Yeah, I think there's a bunch of PNG stuff that is largely useless (like Adam7) where if you want to actually support everything, you're doing a lot more work for basically no benefit other than to be compliant with all images. It's a shame when formats have stuff like that :(

      11:23 PM - 24 Jun 2018
      1 reply 0 retweets 0 likes
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        2. richard cattermole‏ @rikkicattermole 24 Jun 2018
          Replying to @cmuratori

          Have you looked at BMP and jpeg for that matter?

          1 reply 0 retweets 0 likes
        3. Casey Muratori‏ @cmuratori 25 Jun 2018
          Replying to @rikkicattermole

          We already load BMPs. We would have stuck with that, but we decided to add PNGs because Photoshop has built-in quick export buttons for it - that was the only reason. We don't use either of them as storage formats.

          1 reply 0 retweets 0 likes
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