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