Initial commit

include/liblvgl/misc/lv_math.h

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+/**
+ * @file lv_math.h
+ *
+ */
+
+#ifndef LV_MATH_H
+#define LV_MATH_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "liblvgl/lv_conf_internal.h"
+#include <stdint.h>
+
+/*********************
+ *      DEFINES
+ *********************/
+#define LV_TRIGO_SIN_MAX 32767
+#define LV_TRIGO_SHIFT 15 /**<  >> LV_TRIGO_SHIFT to normalize*/
+
+#define LV_BEZIER_VAL_MAX 1024 /**< Max time in Bezier functions (not [0..1] to use integers)*/
+#define LV_BEZIER_VAL_SHIFT 10 /**< log2(LV_BEZIER_VAL_MAX): used to normalize up scaled values*/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+typedef struct {
+    uint16_t i;
+    uint16_t f;
+} lv_sqrt_res_t;
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+
+//! @cond Doxygen_Suppress
+/**
+ * Return with sinus of an angle
+ * @param angle
+ * @return sinus of 'angle'. sin(-90) = -32767, sin(90) = 32767
+ */
+LV_ATTRIBUTE_FAST_MEM int16_t lv_trigo_sin(int16_t angle);
+
+static inline LV_ATTRIBUTE_FAST_MEM int16_t lv_trigo_cos(int16_t angle)
+{
+    return lv_trigo_sin(angle + 90);
+}
+
+//! @endcond
+
+/**
+ * Calculate a value of a Cubic Bezier function.
+ * @param t time in range of [0..LV_BEZIER_VAL_MAX]
+ * @param u0 start values in range of [0..LV_BEZIER_VAL_MAX]
+ * @param u1 control value 1 values in range of [0..LV_BEZIER_VAL_MAX]
+ * @param u2 control value 2 in range of [0..LV_BEZIER_VAL_MAX]
+ * @param u3 end values in range of [0..LV_BEZIER_VAL_MAX]
+ * @return the value calculated from the given parameters in range of [0..LV_BEZIER_VAL_MAX]
+ */
+uint32_t lv_bezier3(uint32_t t, uint32_t u0, uint32_t u1, uint32_t u2, uint32_t u3);
+
+/**
+ * Calculate the atan2 of a vector.
+ * @param x
+ * @param y
+ * @return the angle in degree calculated from the given parameters in range of [0..360]
+ */
+uint16_t lv_atan2(int x, int y);
+
+//! @cond Doxygen_Suppress
+
+/**
+ * Get the square root of a number
+ * @param x integer which square root should be calculated
+ * @param q store the result here. q->i: integer part, q->f: fractional part in 1/256 unit
+ * @param mask optional to skip some iterations if the magnitude of the root is known.
+ * Set to 0x8000 by default.
+ * If root < 16: mask = 0x80
+ * If root < 256: mask = 0x800
+ * Else: mask = 0x8000
+ */
+LV_ATTRIBUTE_FAST_MEM void lv_sqrt(uint32_t x, lv_sqrt_res_t * q, uint32_t mask);
+
+//! @endcond
+
+/**
+ * Calculate the integer exponents.
+ * @param base
+ * @param power
+ * @return base raised to the power exponent
+ */
+int64_t lv_pow(int64_t base, int8_t exp);
+
+/**
+ * Get the mapped of a number given an input and output range
+ * @param x integer which mapped value should be calculated
+ * @param min_in min input range
+ * @param max_in max input range
+ * @param min_out max output range
+ * @param max_out max output range
+ * @return the mapped number
+ */
+int32_t lv_map(int32_t x, int32_t min_in, int32_t max_in, int32_t min_out, int32_t max_out);
+
+/**
+ * Get a pseudo random number in the given range
+ * @param min   the minimum value
+ * @param max   the maximum value
+ * @return return the random number. min <= return_value <= max
+ */
+uint32_t lv_rand(uint32_t min, uint32_t max);
+
+/**********************
+ *      MACROS
+ **********************/
+#define LV_MIN(a, b) ((a) < (b) ? (a) : (b))
+#define LV_MIN3(a, b, c) (LV_MIN(LV_MIN(a,b), c))
+#define LV_MIN4(a, b, c, d) (LV_MIN(LV_MIN(a,b), LV_MIN(c,d)))
+
+#define LV_MAX(a, b) ((a) > (b) ? (a) : (b))
+#define LV_MAX3(a, b, c) (LV_MAX(LV_MAX(a,b), c))
+#define LV_MAX4(a, b, c, d) (LV_MAX(LV_MAX(a,b), LV_MAX(c,d)))
+
+#define LV_CLAMP(min, val, max) (LV_MAX(min, (LV_MIN(val, max))))
+
+#define LV_ABS(x) ((x) > 0 ? (x) : (-(x)))
+#define LV_UDIV255(x) (((x) * 0x8081U) >> 0x17)
+
+#define LV_IS_SIGNED(t) (((t)(-1)) < ((t)0))
+#define LV_UMAX_OF(t) (((0x1ULL << ((sizeof(t) * 8ULL) - 1ULL)) - 1ULL) | (0xFULL << ((sizeof(t) * 8ULL) - 4ULL)))
+#define LV_SMAX_OF(t) (((0x1ULL << ((sizeof(t) * 8ULL) - 1ULL)) - 1ULL) | (0x7ULL << ((sizeof(t) * 8ULL) - 4ULL)))
+#define LV_MAX_OF(t) ((unsigned long)(LV_IS_SIGNED(t) ? LV_SMAX_OF(t) : LV_UMAX_OF(t)))
+
+#ifdef __cplusplus
+} /*extern "C"*/
+#endif
+
+#endif