255 lines
7.2 KiB
C
255 lines
7.2 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 "../lv_conf_internal.h"
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#include "lv_types.h"
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#include "lv_math.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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* Represents a point on the screen.
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*/
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typedef struct {
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int32_t x;
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int32_t y;
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} lv_point_t;
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typedef struct {
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lv_value_precise_t x;
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lv_value_precise_t y;
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} lv_point_precise_t;
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/** Represents an area of the screen.*/
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typedef struct {
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int32_t x1;
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int32_t y1;
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int32_t x2;
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int32_t y2;
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} lv_area_t;
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/** Alignments*/
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typedef enum {
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LV_ALIGN_DEFAULT = 0,
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LV_ALIGN_TOP_LEFT,
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LV_ALIGN_TOP_MID,
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LV_ALIGN_TOP_RIGHT,
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LV_ALIGN_BOTTOM_LEFT,
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LV_ALIGN_BOTTOM_MID,
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LV_ALIGN_BOTTOM_RIGHT,
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LV_ALIGN_LEFT_MID,
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LV_ALIGN_RIGHT_MID,
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LV_ALIGN_CENTER,
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LV_ALIGN_OUT_TOP_LEFT,
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LV_ALIGN_OUT_TOP_MID,
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LV_ALIGN_OUT_TOP_RIGHT,
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LV_ALIGN_OUT_BOTTOM_LEFT,
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LV_ALIGN_OUT_BOTTOM_MID,
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LV_ALIGN_OUT_BOTTOM_RIGHT,
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LV_ALIGN_OUT_LEFT_TOP,
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LV_ALIGN_OUT_LEFT_MID,
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LV_ALIGN_OUT_LEFT_BOTTOM,
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LV_ALIGN_OUT_RIGHT_TOP,
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LV_ALIGN_OUT_RIGHT_MID,
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LV_ALIGN_OUT_RIGHT_BOTTOM,
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} lv_align_t;
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typedef enum {
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LV_DIR_NONE = 0x00,
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LV_DIR_LEFT = (1 << 0),
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LV_DIR_RIGHT = (1 << 1),
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LV_DIR_TOP = (1 << 2),
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LV_DIR_BOTTOM = (1 << 3),
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LV_DIR_HOR = LV_DIR_LEFT | LV_DIR_RIGHT,
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LV_DIR_VER = LV_DIR_TOP | LV_DIR_BOTTOM,
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LV_DIR_ALL = LV_DIR_HOR | LV_DIR_VER,
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} lv_dir_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, int32_t x1, int32_t y1, int32_t x2, int32_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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dest->x1 = src->x1;
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dest->y1 = src->y1;
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dest->x2 = src->x2;
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dest->y2 = src->y2;
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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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int32_t lv_area_get_width(const lv_area_t * area_p);
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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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int32_t lv_area_get_height(const lv_area_t * area_p);
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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, int32_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, int32_t h);
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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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void lv_area_increase(lv_area_t * area, int32_t w_extra, int32_t h_extra);
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void lv_area_move(lv_area_t * area, int32_t x_ofs, int32_t y_ofs);
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/**
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* Align an area to another
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* @param base an area where the other will be aligned
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* @param to_align the area to align
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* @param align `LV_ALIGN_...`
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* @param ofs_x X offset
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* @param ofs_y Y offset
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*/
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void lv_area_align(const lv_area_t * base, lv_area_t * to_align, lv_align_t align, int32_t ofs_x, int32_t ofs_y);
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/**
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* Transform a point
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* @param point pointer to a point
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* @param angle angle with 0.1 resolutions (123 means 12.3°)
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* @param scale_x horizontal zoom, 256 means 100%
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* @param scale_y vertical zoom, 256 means 100%
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* @param pivot pointer to the pivot point of the transformation
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* @param zoom_first true: zoom first and rotate after that; else: opposite order
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*/
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void lv_point_transform(lv_point_t * point, int32_t angle, int32_t scale_x, int32_t scale_y, const lv_point_t * pivot,
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bool zoom_first);
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/**
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* Transform an array of points
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* @param points pointer to an array of points
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* @param count number of points in the array
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* @param angle angle with 0.1 resolutions (123 means 12.3°)
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* @param scale_x horizontal zoom, 256 means 100%
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* @param scale_y vertical zoom, 256 means 100%
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* @param pivot pointer to the pivot point of the transformation
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* @param zoom_first true: zoom first and rotate after that; else: opposite order
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*/
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void lv_point_array_transform(lv_point_t * points, size_t count, int32_t angle, int32_t scale_x, int32_t scale_y,
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const lv_point_t * pivot,
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bool zoom_first);
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lv_point_t lv_point_from_precise(const lv_point_precise_t * p);
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lv_point_precise_t lv_point_to_precise(const lv_point_t * p);
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void lv_point_set(lv_point_t * p, int32_t x, int32_t y);
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void lv_point_precise_set(lv_point_precise_t * p, lv_value_precise_t x, lv_value_precise_t y);
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void lv_point_swap(lv_point_t * p1, lv_point_t * p2);
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void lv_point_precise_swap(lv_point_precise_t * p1, lv_point_precise_t * p2);
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/**********************
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* MACROS
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**********************/
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#define LV_COORD_TYPE_SHIFT (29U)
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#define LV_COORD_TYPE_MASK (3 << LV_COORD_TYPE_SHIFT)
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#define LV_COORD_TYPE(x) ((x) & LV_COORD_TYPE_MASK) /*Extract type specifiers*/
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#define LV_COORD_PLAIN(x) ((x) & ~LV_COORD_TYPE_MASK) /*Remove type specifiers*/
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#define LV_COORD_TYPE_PX (0 << LV_COORD_TYPE_SHIFT)
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#define LV_COORD_TYPE_SPEC (1 << LV_COORD_TYPE_SHIFT)
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#define LV_COORD_TYPE_PX_NEG (3 << LV_COORD_TYPE_SHIFT)
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#define LV_COORD_IS_PX(x) (LV_COORD_TYPE(x) == LV_COORD_TYPE_PX || LV_COORD_TYPE(x) == LV_COORD_TYPE_PX_NEG)
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#define LV_COORD_IS_SPEC(x) (LV_COORD_TYPE(x) == LV_COORD_TYPE_SPEC)
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#define LV_COORD_SET_SPEC(x) ((x) | LV_COORD_TYPE_SPEC)
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/** Max coordinate value */
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#define LV_COORD_MAX ((1 << LV_COORD_TYPE_SHIFT) - 1)
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#define LV_COORD_MIN (-LV_COORD_MAX)
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/*Special coordinates*/
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#define LV_SIZE_CONTENT LV_COORD_SET_SPEC(LV_COORD_MAX)
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#define LV_PCT_STORED_MAX (LV_COORD_MAX - 1)
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#if LV_PCT_STORED_MAX % 2 != 0
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#error LV_PCT_STORED_MAX should be an even number
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#endif
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#define LV_PCT_POS_MAX (LV_PCT_STORED_MAX / 2)
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#define LV_PCT(x) (LV_COORD_SET_SPEC(((x) < 0 ? (LV_PCT_POS_MAX - LV_MAX((x), -LV_PCT_POS_MAX)) : LV_MIN((x), LV_PCT_POS_MAX))))
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#define LV_COORD_IS_PCT(x) ((LV_COORD_IS_SPEC(x) && LV_COORD_PLAIN(x) <= LV_PCT_STORED_MAX))
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#define LV_COORD_GET_PCT(x) (LV_COORD_PLAIN(x) > LV_PCT_POS_MAX ? LV_PCT_POS_MAX - LV_COORD_PLAIN(x) : LV_COORD_PLAIN(x))
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LV_EXPORT_CONST_INT(LV_COORD_MAX);
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LV_EXPORT_CONST_INT(LV_COORD_MIN);
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LV_EXPORT_CONST_INT(LV_SIZE_CONTENT);
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/**
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* Convert a percentage value to `int32_t`.
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* Percentage values are stored in special range
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* @param x the percentage (0..1000)
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* @return a coordinate that stores the percentage
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*/
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int32_t lv_pct(int32_t x);
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int32_t lv_pct_to_px(int32_t v, int32_t base);
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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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