Nicholas Nethercote bc8cdf084b Bug 1213613 (part 3) - Fix color-scaling of 16bpp BMP images. r=seth.
This patch implements proper color-scaling, instead of bit-shifting, and uses
it for 16bpp images.

It also cleans up the code relating to color masking in the process, by making
BitFields a proper class and introducing the Value class within it.

This fixes sub-optimal handling of four images in bmpsuite.
2015-10-13 20:01:02 -07:00
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