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Safe texture compression (#2808)

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Only a single program was used to safely compress all textures in MTG.

 * `optipng -o7 -zm1-9 -nc -strip all -clobber %%f`

The key command used is -nc, which stops color mode changes. I.e. any RGBA textures will remain RGBA textures, with none being changes to 8-bit indexed mode.

utils/optimize_textures.sh performs this compression automatically, assuming optipng is installed.
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ExeVirus 2021-02-12 14:55:18 -05:00 • committed by GitHub
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#!/bin/bash
# Colors with 0 alpha need to be preserved, because opaque leaves ignore alpha.
# For that purpose, the use of indexed colors is disabled (-nc).
find -name '../*.png' -print0 | xargs -0 optipng -o7 -zm1-9 -nc -strip all -clobber