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vwebp: Add background color display option

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Option -usebgcolor may be used to display ANIM background color (or white if no ANIM chunk), blended on top of checkerboard. By default this is disabled (old behavior) to easily see transparent areas. Spec says that "background color MAY be used", so it's an option.
Key b may be pressed to toggle ANIM background color display. There are visual artifacts (leftovers) when toggling during an animation. This is already the case for rescaling, toggling info etc. (fixing it implies storing viewport render or rendering whole animation from start till current frame).

BUG=webp:394

Change-Id: If9ab898b2eac77226f30f062d522f9861789ef8f
This commit is contained in:
Yannis Guyon
2018-07-20 12:54:30 +02:00
parent 78ad57a36a
commit 4649b3c422
3 changed files with 66 additions and 31 deletions
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README
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@ -402,12 +402,14 @@ Options are:
-nofilter .... disable in-loop filtering
-dither <int> dithering strength (0..100), default=50
-noalphadither disable alpha plane dithering
-usebgcolor .. display background color
-mt .......... use multi-threading
-info ........ print info
-h ........... this help message
Keyboard shortcuts:
'c' ................ toggle use of color profile
'b' ................ toggle background color display
'i' ................ overlay file information
'd' ................ disable blending & disposal (debug)
'q' / 'Q' / ESC .... quit