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[USAGE] update comment text

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nick black 2022-01-23 19:00:04 -05:00
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USAGE.md
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@ -1807,16 +1807,18 @@ all implemented in terms of the lower-level [Channels API](#channels).
uint64_t ncplane_channels(const struct ncplane* n);
uint16_t ncplane_attr(const struct ncplane* n);
// Extract the 32-bit working background channel from an ncplane.
static inline unsigned
ncplane_bchannel(const struct ncplane* nc){
return ncchannels_bchannel(ncplane_channels(nc));
// Extract the background alpha and coloring bits from a 64-bit channel
// pair as a single 32-bit value.
static inline uint32_t
ncplane_bchannel(const struct ncplane* n){
return ncchannels_bchannel(ncplane_channels(n));
}
// Extract the 32-bit working foreground channel from an ncplane.
static inline unsigned
ncplane_fchannel(const struct ncplane* nc){
return ncchannels_fchannel(ncplane_channels(nc));
// Extract the foreground alpha and coloring bits from a 64-bit channel
// pair as a single 32-bit value.
static inline uint32_t
ncplane_fchannel(const struct ncplane* n){
return ncchannels_fchannel(ncplane_channels(n));
}
// Extract 24 bits of working foreground RGB from an ncplane, shifted to LSBs.