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make ncchannels_set_[fb]channel safe #2571

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nick black 2022-01-23 18:55:47 -05:00
parent c996282e05
commit 64e3444b9f
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1 changed files with 12 additions and 4 deletions
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16
include/notcurses/notcurses.h
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@ -327,16 +327,24 @@ ncchannels_bg_alpha(uint64_t channels){
return ncchannel_alpha(ncchannels_bchannel(channels));
}
// Set the 32-bit background channel of a channel pair.
// Set the background alpha and coloring bits of the 64-bit channel pair
// from a single 32-bit value.
static inline uint64_t
ncchannels_set_bchannel(uint64_t* channels, uint32_t channel){
return *channels = (*channels & 0xffffffff00000000llu) | channel;
// drop the background color and alpha bit
*channels &= ((0xffffffffllu << 32u) | NC_NOBACKGROUND_MASK);
*channels |= (uint32_t)(channel & ~NC_NOBACKGROUND_MASK);
return *channels;
}
// Set the 32-bit foreground channel of a channel pair.
// Set the foreground alpha and coloring bits of the 64-bit channel pair
// from a single 32-bit value.
static inline uint64_t
ncchannels_set_fchannel(uint64_t* channels, uint32_t channel){
return *channels = (*channels & 0xfffffffflu) | ((uint64_t)channel << 32u);
// drop the foreground color and alpha bit
*channels &= (0xffffffffllu | ((uint64_t)NC_NOBACKGROUND_MASK << 32u));
*channels |= (uint64_t)(channel & ~NC_NOBACKGROUND_MASK) << 32u;
return *channels;
}
// Set the 2-bit alpha component of the background channel.