-/**
- * Copyright (c) 2019 The xterm.js authors. All rights reserved.
- * @license MIT
- */
-
-export const DEFAULT_COLOR = 256;
-export const DEFAULT_ATTR = (0 << 18) | (DEFAULT_COLOR << 9) | (256 << 0);
-
-export const CHAR_DATA_ATTR_INDEX = 0;
-export const CHAR_DATA_CHAR_INDEX = 1;
-export const CHAR_DATA_WIDTH_INDEX = 2;
-export const CHAR_DATA_CODE_INDEX = 3;
-
-/**
- * Null cell - a real empty cell (containing nothing).
- * Note that code should always be 0 for a null cell as
- * several test condition of the buffer line rely on this.
- */
-export const NULL_CELL_CHAR = '';
-export const NULL_CELL_WIDTH = 1;
-export const NULL_CELL_CODE = 0;
-
-/**
- * Whitespace cell.
- * This is meant as a replacement for empty cells when needed
- * during rendering lines to preserve correct aligment.
- */
-export const WHITESPACE_CELL_CHAR = ' ';
-export const WHITESPACE_CELL_WIDTH = 1;
-export const WHITESPACE_CELL_CODE = 32;
-
-/**
- * Bitmasks for accessing data in `content`.
- */
-export const enum Content {
- /**
- * bit 1..21 codepoint, max allowed in UTF32 is 0x10FFFF (21 bits taken)
- * read: `codepoint = content & Content.codepointMask;`
- * write: `content |= codepoint & Content.codepointMask;`
- * shortcut if precondition `codepoint <= 0x10FFFF` is met:
- * `content |= codepoint;`
- */
- CODEPOINT_MASK = 0x1FFFFF,
-
- /**
- * bit 22 flag indication whether a cell contains combined content
- * read: `isCombined = content & Content.isCombined;`
- * set: `content |= Content.isCombined;`
- * clear: `content &= ~Content.isCombined;`
- */
- IS_COMBINED_MASK = 0x200000, // 1 << 21
-
- /**
- * bit 1..22 mask to check whether a cell contains any string data
- * we need to check for codepoint and isCombined bits to see
- * whether a cell contains anything
- * read: `isEmpty = !(content & Content.hasContent)`
- */
- HAS_CONTENT_MASK = 0x3FFFFF,
-
- /**
- * bit 23..24 wcwidth value of cell, takes 2 bits (ranges from 0..2)
- * read: `width = (content & Content.widthMask) >> Content.widthShift;`
- * `hasWidth = content & Content.widthMask;`
- * as long as wcwidth is highest value in `content`:
- * `width = content >> Content.widthShift;`
- * write: `content |= (width << Content.widthShift) & Content.widthMask;`
- * shortcut if precondition `0 <= width <= 3` is met:
- * `content |= width << Content.widthShift;`
- */
- WIDTH_MASK = 0xC00000, // 3 << 22
- WIDTH_SHIFT = 22
-}
-
-export const enum Attributes {
- /**
- * bit 1..8 blue in RGB, color in P256 and P16
- */
- BLUE_MASK = 0xFF,
- BLUE_SHIFT = 0,
- PCOLOR_MASK = 0xFF,
- PCOLOR_SHIFT = 0,
-
- /**
- * bit 9..16 green in RGB
- */
- GREEN_MASK = 0xFF00,
- GREEN_SHIFT = 8,
-
- /**
- * bit 17..24 red in RGB
- */
- RED_MASK = 0xFF0000,
- RED_SHIFT = 16,
-
- /**
- * bit 25..26 color mode: DEFAULT (0) | P16 (1) | P256 (2) | RGB (3)
- */
- CM_MASK = 0x3000000,
- CM_DEFAULT = 0,
- CM_P16 = 0x1000000,
- CM_P256 = 0x2000000,
- CM_RGB = 0x3000000,
-
- /**
- * bit 1..24 RGB room
- */
- RGB_MASK = 0xFFFFFF
-}
-
-export const enum FgFlags {
- /**
- * bit 27..31 (32th bit unused)
- */
- INVERSE = 0x4000000,
- BOLD = 0x8000000,
- UNDERLINE = 0x10000000,
- BLINK = 0x20000000,
- INVISIBLE = 0x40000000
-}
-
-export const enum BgFlags {
- /**
- * bit 27..32 (upper 4 unused)
- */
- ITALIC = 0x4000000,
- DIM = 0x8000000
-}