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Implementating Transparent PNGs in IE7

Posted by timothy on from the hammers-and-tongs dept.

Brandon writes "Over at the official IE Blog, Sam Fortiner has posted some very detailed information regarding Alpha PNG Rendering in IE7. From the article: 'As the dev who implemented the support, I can state that it was neither a bug-fix nor did it require a re-write of the display engine. Instead, it ended up being somewhere in-between the two and required what I would call "feature work." Implementing transparency support for PNG images required a significant amount of modification to the image decoding and display pipeline in IE along with a significant amount of new functionality added to the PNG decoder.'"

2 of 97 comments (clear)

  1. libpng.... by __david__ · · Score: 4, Interesting

    So this implies they wrote their own PNG reading routines instead of using libpng?

    Is this some sort of NIH thing?

    libpng has a BSDish licence if I recall... So that can't be the issue...

    -David

    --
    There. Now go play some cool javascript games!
  2. Probably because IE displays images as they load.. by cwensley · · Score: 3, Interesting

    I'd imagine this would be why IE can show images as they download, instead of waiting for the whole thing to download like other browsers...

    I could be wrong..