101  * @param x integer which square root should be calculated
109 void LV_ATTRIBUTE_FAST_MEM lv_sqrt(uint32_t x, lv_sqrt_res_t * q, uint32_t mask)  in lv_sqrt()  argument
111     x = x << 8; /*To get 4 bit precision. (sqrt(256) = 16 = 4 bit)*/  in lv_sqrt()
118         if(trial * trial <= x) root = trial;  in lv_sqrt()
128  * @param x
132 uint16_t lv_atan2(int x, int y)  in lv_atan2()  argument
138     // NOTE! at least one of the X or Y values must be non-zero!  in lv_atan2()
141     // Any values of X and Y are usable including negative values provided  in lv_atan2()
153     if(x < 0) {  in lv_atan2()
154         negflag += 0x01;    // x flag bit  in lv_atan2()
155         x = (0 - x);        // is now +  in lv_atan2()
157     ux = x;                // copy to unsigned var before multiply  in lv_atan2()
190     // Invert degree if it was X>Y octant, makes 0-45 into 90-45  in lv_atan2()
196         if(negflag & 0x01)   // if -Y -X  in lv_atan2()
198         else        // else is -Y +X  in lv_atan2()
202         if(negflag & 0x01)   // if +Y -X  in lv_atan2()
229  * @param x integer which mapped value should be calculated
236 int32_t lv_map(int32_t x, int32_t min_in, int32_t max_in, int32_t min_out, int32_t max_out)  in lv_map()  argument
238     if(max_in >= min_in && x >= max_in) return max_out;  in lv_map()
239     if(max_in >= min_in && x <= min_in) return min_out;  in lv_map()
241     if(max_in <= min_in && x <= max_in) return max_out;  in lv_map()
242     if(max_in <= min_in && x >= min_in) return min_out;  in lv_map()
246      *   ((x - min_in) * delta_out) / delta in) + min_out  in lv_map()
248      *   (x - min_in) * (delta_out / delta_min) + min_out  in lv_map()
254     return ((x - min_in) * delta_out) / delta_in + min_out;  in lv_map()
262     uint32_t x = a;  in lv_rand()  local
263     x ^= x << 13;  in lv_rand()
264     x ^= x >> 17;  in lv_rand()
265     x ^= x << 5;  in lv_rand()
266     a = x;  in lv_rand()