Comments (1)
Hi,
The PNG file format itself supports this (see *), but the LodePNG encoder and decoder don't support streaming, LodePNG requires full data available. Adding support for this will require a drastic code change, so is not likely to happen soon.
If a streaming API is required, then probably the official libpng library (http://www.libpng.org/pub/png/libpng.html) will be more suitable.
(*) The PNG file format supports streaming, because PNG filters on pixels depend only on past pixels. The deflate compression used also only depends on past data, it just requires working on blocks of data at a time. PNG supports interlacing, which is designed to load the PNG in a streaming fashion, from low resolution to higher, which is done in web browsers. LodePNG can read those, but all at once, no streaming.
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