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event-sequence-transformation
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Single modifier type

This commit is contained in:
Vftdan 2024-08-17 14:47:53 +02:00
parent 4f71351796
commit 8e6795a051
1 changed files with 57 additions and 0 deletions
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57
modifiers.h
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@ -9,6 +9,8 @@ typedef struct {
uint8_t *bits;
} ModifierSet;
typedef int32_t Modifier;
#define EMPTY_MODIFIER_SET ((ModifierSet) {.byte_length = 0, .bits = NULL})
__attribute__((unused)) inline static ModifierSet
@ -84,4 +86,59 @@ modifier_set_toggle_from(ModifierSet * target, const ModifierSet source)
}
}
__attribute__((unused)) inline static void
modifier_index_and_mask(Modifier modifier, size_t * byte_index, uint8_t * mask)
{
if (byte_index) {
*byte_index = modifier >> 3;
}
if (mask) {
*mask = 1 << (modifier & 7);
}
}
__attribute__((unused)) inline static bool
modifier_set_has(ModifierSet collection, Modifier element)
{
size_t byte_index;
uint8_t mask;
modifier_index_and_mask(element, &byte_index, &mask);
if (byte_index >= collection.byte_length) {
return false;
}
return (collection.bits[byte_index] & mask) != 0;
}
__attribute__((unused)) inline static void
modifier_set_set(ModifierSet * target, Modifier element)
{
size_t byte_index;
uint8_t mask;
modifier_index_and_mask(element, &byte_index, &mask);
modifier_set_extend(target, byte_index + 1);
target->bits[byte_index] |= mask;
}
__attribute__((unused)) inline static void
modifier_set_unset(ModifierSet * target, Modifier element)
{
size_t byte_index;
uint8_t mask;
modifier_index_and_mask(element, &byte_index, &mask);
if (byte_index >= target->byte_length) {
return;
}
target->bits[byte_index] &= ~mask;
}
__attribute__((unused)) inline static void
modifier_set_toggle(ModifierSet * target, Modifier element)
{
size_t byte_index;
uint8_t mask;
modifier_index_and_mask(element, &byte_index, &mask);
modifier_set_extend(target, byte_index + 1);
target->bits[byte_index] ^= mask;
}
#endif /* end of include guard: MODIFIERS_H_ */