Class BufferCell

lib/buffer.ts:295–407

 * A single cell in the buffer
 */
export class BufferCell implements IBufferCell {
  private cell: GhosttyCell;
  private x: number;

  constructor(cell: GhosttyCell, x: number) {
    this.cell = cell;
    this.x = x;
  }

  getChars(): string {
    const codepoint = this.cell.codepoint;

    // Return empty string for null character or invalid codepoints
    if (codepoint === 0) {
      return '';
    }

    // Validate codepoint is within valid Unicode range
    // Valid: 0x0000 to 0x10FFFF, excluding surrogates (0xD800-0xDFFF)
    if (codepoint < 0 || codepoint > 0x10ffff || (codepoint >= 0xd800 && codepoint <= 0xdfff)) {
      // Return replacement character for invalid codepoints
      return '\uFFFD';
    }

    return String.fromCodePoint(codepoint);
  }

  getCode(): number {
    return this.cell.codepoint;
  }

  getWidth(): number {
    return this.cell.width;
  }

  getFgColorMode(): number {
    // Return -1 for RGB (we always use RGB in our WASM implementation)
    // xterm.js uses different values:
    // 0 = default, 1 = palette 16, 2 = palette 256, 3 = RGB
    // For simplicity, we return -1 for RGB
    return -1;
  }

  getBgColorMode(): number {
    return -1;
  }

  getFgColor(): number {
    // Pack RGB into a single number: 0xRRGGBB
    return (this.cell.fg_r << 16) | (this.cell.fg_g << 8) | this.cell.fg_b;
  }

  getBgColor(): number {
    // Pack RGB into a single number: 0xRRGGBB
    return (this.cell.bg_r << 16) | (this.cell.bg_g << 8) | this.cell.bg_b;
  }

  isBold(): number {