> decompressing the entire image all-at-once (into one large intermediate buffer) instead of one row at a time (into smaller, re-usable buffers). All-at-once re

> decompressing the entire image all-at-once (into one large intermediate buffer) instead of one row at a time (into smaller, re-usable buffers). All-at-once requires more intermediate memory but allows substantially more of the image to be decoded in the zlib-decompressor’s fastest code paths. Mozilla's imagelib has a neat trick to gain performance while working with smaller memory buffers when you want to render the output image at a smaller resolution than it is encoded. They call it downscale-during-decode. So this library pulls zlib decompression into the decode loop. Imagelib on the other hand optimizes at the other end of the pipeline and pulls downscaling into the decode loop. imagelib's optimization has the advantage that it helps with both small images as long as they're not displayed pixel-exact and also makes decoding humungous images feasible without causing the browser to explode with OOMs.