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#ifndef NVIM_GRID_DEFS_H
#define NVIM_GRID_DEFS_H
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include "nvim/types.h"
#define MAX_MCO 6 // maximum value for 'maxcombine'
// The characters and attributes drawn on grids.
typedef char_u schar_T[(MAX_MCO+1) * 4 + 1];
typedef int16_t sattr_T;
/// ScreenGrid represents a resizable rectuangular grid displayed by UI clients.
///
/// chars[] contains the UTF-8 text that is currently displayed on the grid.
/// It is stored as a single block of cells. When redrawing a part of the grid,
/// the new state can be compared with the existing state of the grid. This way
/// we can avoid sending bigger updates than neccessary to the Ul layer.
///
/// Screen cells are stored as NUL-terminated UTF-8 strings, and a cell can
/// contain up to MAX_MCO composing characters after the base character.
/// The composing characters are to be drawn on top of the original character.
/// The content after the NUL is not defined (so comparison must be done a
/// single cell at a time). Double-width characters are stored in the left cell,
/// and the right cell should only contain the empty string. When a part of the
/// screen is cleared, the cells should be filled with a single whitespace char.
///
/// attrs[] contains the highlighting attribute for each cell.
/// line_offset[n] is the offset from chars[] and attrs[] for the
/// start of line 'n'. These offsets are in general not linear, as full screen
/// scrolling is implemented by rotating the offsets in the line_offset array.
/// line_wraps[] is an array of boolean flags indicating if the screen line
/// wraps to the next line. It can only be true if a window occupies the entire
/// screen width.
typedef struct {
handle_T handle;
schar_T *chars;
sattr_T *attrs;
unsigned *line_offset;
char_u *line_wraps;
// the size of the allocated grid.
int Rows;
int Columns;
// The state of the grid is valid. Otherwise it needs to be redrawn.
bool valid;
// offsets for the grid relative to the global screen
int row_offset;
int col_offset;
// state owned by the compositor.
int comp_row;
int comp_col;
size_t comp_index;
bool comp_disabled;
} ScreenGrid;
#define SCREEN_GRID_INIT { 0, NULL, NULL, NULL, NULL, 0, 0, false, 0, 0, 0, \
0, 0, false }
#endif // NVIM_GRID_DEFS_H
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