Adolfo Reyna
92 lines
2.2 KiB
C
92 lines
2.2 KiB
C
/**
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* @file lv_utils.h
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*
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*/
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#ifndef LV_UTILS_H
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#define LV_UTILS_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*********************
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* INCLUDES
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*********************/
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#include "lv_types.h"
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#include "../draw/lv_draw_buf.h"
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/*********************
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* DEFINES
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*********************/
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/**********************
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* TYPEDEFS
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**********************/
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/**********************
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* GLOBAL PROTOTYPES
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**********************/
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/** Searches base[0] to base[n - 1] for an item that matches *key.
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*
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* @note The function cmp must return negative if it's first
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* argument (the search key) is less that it's second (a table entry),
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* zero if equal, and positive if greater.
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*
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* @note Items in the array must be in ascending order.
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*
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* @param key Pointer to item being searched for
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* @param base Pointer to first element to search
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* @param n Number of elements
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* @param size Size of each element
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* @param cmp Pointer to comparison function (see unicode_list_compare()
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* as a comparison function example)
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*
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* @return a pointer to a matching item, or NULL if none exists.
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*/
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void * lv_utils_bsearch(const void * key, const void * base, size_t n, size_t size,
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int (*cmp)(const void * pRef, const void * pElement));
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/**
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* Save a draw buf to a file
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* @param draw_buf pointer to a draw buffer
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* @param path path to the file to save
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* @return LV_RESULT_OK: success; LV_RESULT_INVALID: error
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*/
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lv_result_t lv_draw_buf_save_to_file(const lv_draw_buf_t * draw_buf, const char * path);
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/**
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* Reverse the order of the bytes in a 32-bit value.
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* @param x a 32-bit value.
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* @return the value `x` with reversed byte-order.
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*/
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static inline uint32_t lv_swap_bytes_32(uint32_t x)
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{
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return (x << 24)
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| ((x & 0x0000ff00U) << 8)
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| ((x & 0x00ff0000U) >> 8)
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| (x >> 24);
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}
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/**
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* Reverse the order of the bytes in a 16-bit value.
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* @param x a 16-bit value.
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* @return the value `x` with reversed byte-order.
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*/
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static inline uint16_t lv_swap_bytes_16(uint16_t x)
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{
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return (x << 8) | (x >> 8);
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}
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/**********************
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* MACROS
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**********************/
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#ifdef __cplusplus
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} /*extern "C"*/
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#endif
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#endif
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