qmk_firmware/quantum/led_matrix/animations/solid_reactive_simple_anim.h

#ifdef LED_MATRIX_KEYREACTIVE_ENABLED
#    ifdef ENABLE_LED_MATRIX_SOLID_REACTIVE_SIMPLE
LED_MATRIX_EFFECT(SOLID_REACTIVE_SIMPLE)
#        ifdef LED_MATRIX_CUSTOM_EFFECT_IMPLS

static uint8_t SOLID_REACTIVE_SIMPLE_math(uint8_t val, uint16_t offset) { return scale8(255 - offset, val); }

bool SOLID_REACTIVE_SIMPLE(effect_params_t* params) { return effect_runner_reactive(params, &SOLID_REACTIVE_SIMPLE_math); }

#        endif  // LED_MATRIX_CUSTOM_EFFECT_IMPLS
#    endif      // DISABLE_LED_MATRIX_SOLID_REACTIVE_SIMPLE
#endif          // LED_MATRIX_KEYREACTIVE_ENABLED