mozilla/pdf.js — pull request #4383 by nnethercote (2014-03-04 05:12:27+00:00)
Title: Use RGB_24BPP form for all images lacking alpha data.

In #4336 I added special handling of certain 24bpp RGB images. This patch extends that so it's used for all otherwise non-specialized images that lack opacity data. For all such images, this constitutes a 25% memory saving.