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https://github.com/CTCaer/hekate.git
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168 lines
4 KiB
C
168 lines
4 KiB
C
/**
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* @file lv_area.h
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*
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*/
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#ifndef LV_AREA_H
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#define LV_AREA_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 <string.h>
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#include <utils/types.h>
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/*********************
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* DEFINES
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*********************/
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#define LV_COORD_MAX (16383) /*To avoid overflow don't let the max [-32,32k] range */
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#define LV_COORD_MIN (-16384)
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/**********************
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* TYPEDEFS
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**********************/
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typedef int16_t lv_coord_t;
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typedef struct
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{
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lv_coord_t x;
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lv_coord_t y;
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} lv_point_t;
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typedef struct
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{
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lv_coord_t x1;
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lv_coord_t y1;
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lv_coord_t x2;
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lv_coord_t y2;
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} lv_area_t;
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/**********************
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* GLOBAL PROTOTYPES
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**********************/
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/**
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* Initialize an area
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* @param area_p pointer to an area
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* @param x1 left coordinate of the area
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* @param y1 top coordinate of the area
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* @param x2 right coordinate of the area
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* @param y2 bottom coordinate of the area
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*/
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void lv_area_set(lv_area_t * area_p, lv_coord_t x1, lv_coord_t y1, lv_coord_t x2, lv_coord_t y2);
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/**
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* Copy an area
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* @param dest pointer to the destination area
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* @param src pointer to the source area
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*/
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inline static void lv_area_copy(lv_area_t * dest, const lv_area_t * src)
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{
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memcpy(dest, src, sizeof(lv_area_t));
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}
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/**
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* Get the width of an area
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* @param area_p pointer to an area
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* @return the width of the area (if x1 == x2 -> width = 1)
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*/
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static inline lv_coord_t lv_area_get_width(const lv_area_t * area_p)
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{
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return area_p->x2 - area_p->x1 + 1;
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}
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/**
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* Get the height of an area
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* @param area_p pointer to an area
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* @return the height of the area (if y1 == y2 -> height = 1)
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*/
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static inline lv_coord_t lv_area_get_height(const lv_area_t * area_p)
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{
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return area_p->y2 - area_p->y1 + 1;
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}
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/**
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* Set the width of an area
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* @param area_p pointer to an area
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* @param w the new width of the area (w == 1 makes x1 == x2)
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*/
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void lv_area_set_width(lv_area_t * area_p, lv_coord_t w);
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/**
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* Set the height of an area
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* @param area_p pointer to an area
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* @param h the new height of the area (h == 1 makes y1 == y2)
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*/
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void lv_area_set_height(lv_area_t * area_p, lv_coord_t h);
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/**
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* Set the position of an area (width and height will be kept)
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* @param area_p pointer to an area
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* @param x the new x coordinate of the area
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* @param y the new y coordinate of the area
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*/
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void lv_area_set_pos(lv_area_t * area_p, lv_coord_t x, lv_coord_t y);
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/**
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* Return with area of an area (x * y)
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* @param area_p pointer to an area
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* @return size of area
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*/
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uint32_t lv_area_get_size(const lv_area_t * area_p);
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/**
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* Get the common parts of two areas
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* @param res_p pointer to an area, the result will be stored her
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* @param a1_p pointer to the first area
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* @param a2_p pointer to the second area
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* @return false: the two area has NO common parts, res_p is invalid
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*/
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bool lv_area_intersect(lv_area_t * res_p, const lv_area_t * a1_p, const lv_area_t * a2_p);
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/**
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* Join two areas into a third which involves the other two
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* @param res_p pointer to an area, the result will be stored here
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* @param a1_p pointer to the first area
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* @param a2_p pointer to the second area
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*/
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void lv_area_join(lv_area_t * a_res_p, const lv_area_t * a1_p, const lv_area_t * a2_p);
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/**
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* Check if a point is on an area
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* @param a_p pointer to an area
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* @param p_p pointer to a point
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* @return false:the point is out of the area
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*/
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bool lv_area_is_point_on(const lv_area_t * a_p, const lv_point_t * p_p);
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/**
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* Check if two area has common parts
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* @param a1_p pointer to an area.
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* @param a2_p pointer to an other area
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* @return false: a1_p and a2_p has no common parts
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*/
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bool lv_area_is_on(const lv_area_t * a1_p, const lv_area_t * a2_p);
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/**
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* Check if an area is fully on an other
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* @param ain_p pointer to an area which could be on aholder_p
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* @param aholder pointer to an area which could involve ain_p
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* @return
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*/
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bool lv_area_is_in(const lv_area_t * ain_p, const lv_area_t * aholder_p);
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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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