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usage: provide updated ncchannels_reverse() definition (#2757)

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nick black 2024-02-12 07:53:15 -05:00
parent 051a1b8bbd
commit 4ad0236a6e
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1 changed files with 12 additions and 2 deletions
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USAGE.md
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@ -3193,10 +3193,20 @@ static inline uint64_t
ncchannels_reverse(uint64_t channels){
const uint64_t raw = ((uint64_t)ncchannels_bchannel(channels) << 32u) +
ncchannels_fchannel(channels);
const uint64_t statemask = (NC_NOBACKGROUND_MASK | NC_FG_ALPHA_MASK |
NC_BG_ALPHA_MASK | (NC_NOBACKGROUND_MASK >> 32u));
const uint64_t statemask = ((NC_NOBACKGROUND_MASK | NC_BG_ALPHA_MASK) << 32u) |
NC_NOBACKGROUND_MASK | NC_BG_ALPHA_MASK;
uint64_t ret = raw & ~statemask;
ret |= channels & statemask;
if(ncchannels_bg_alpha(ret) != NCALPHA_OPAQUE){
if(!ncchannels_bg_rgb_p(ret)){
ncchannels_set_bg_alpha(&ret, NCALPHA_OPAQUE);
}
}
if(ncchannels_fg_alpha(ret) != NCALPHA_OPAQUE){
if(!ncchannels_fg_rgb_p(ret)){
ncchannels_set_fg_alpha(&ret, NCALPHA_OPAQUE);
}
}
return ret;
}