qmk_firmware/quantum/rgb_matrix/animations/hue_breathing_anim.h

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#ifdef ENABLE_RGB_MATRIX_HUE_BREATHING
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RGB_MATRIX_EFFECT(HUE_BREATHING)
# ifdef RGB_MATRIX_CUSTOM_EFFECT_IMPLS
// Change huedelta to adjust range of hue change. 0-255.
// Hue Breathing - All LED's light up
bool HUE_BREATHING(effect_params_t* params) {
RGB_MATRIX_USE_LIMITS(led_min, led_max);
uint8_t huedelta = 12;
HSV hsv = rgb_matrix_config.hsv;
uint16_t time = scale16by8(g_rgb_timer, rgb_matrix_config.speed / 8);
hsv.h = hsv.h + scale8(abs8(sin8(time) - 128) * 2, huedelta);
RGB rgb = hsv_to_rgb(hsv);
for (uint8_t i = led_min; i < led_max; i++) {
RGB_MATRIX_TEST_LED_FLAGS();
rgb_matrix_set_color(i, rgb.r, rgb.g, rgb.b);
}
return rgb_matrix_check_finished_leds(led_max);
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}
# endif // RGB_MATRIX_CUSTOM_EFFECT_IMPLS
#endif // DISABLE_RGB_HUE_BREATHING