Method createAppearance

public/lib/pdfjs/pdf.worker.mjs:38969–39043

(text, rect, rotation, fontSize, bgColor, strokeAlpha)

    };
  }
  createAppearance(text, rect, rotation, fontSize, bgColor, strokeAlpha) {
    const ctx = this._createContext();
    const lines = [];
    let maxWidth = -Infinity;
    for (const line of text.split(/\r\n?|\n/)) {
      lines.push(line);
      const lineWidth = ctx.measureText(line).width;
      maxWidth = Math.max(maxWidth, lineWidth);
      for (const code of codePointIter(line)) {
        const char = String.fromCodePoint(code);
        let width = this.widths.get(code);
        if (width === undefined) {
          const metrics = ctx.measureText(char);
          width = Math.ceil(metrics.width);
          this.widths.set(code, width);
          this.firstChar = Math.min(code, this.firstChar);
          this.lastChar = Math.max(code, this.lastChar);
        }
      }
    }
    maxWidth *= fontSize / 1000;
    const [x1, y1, x2, y2] = rect;
    let w = x2 - x1;
    let h = y2 - y1;
    if (rotation % 180 !== 0) {
      [w, h] = [h, w];
    }
    let hscale = 1;
    if (maxWidth > w) {
      hscale = w / maxWidth;
    }
    let vscale = 1;
    const lineHeight = LINE_FACTOR * fontSize;
    const lineDescent = LINE_DESCENT_FACTOR * fontSize;
    const maxHeight = lineHeight * lines.length;
    if (maxHeight > h) {
      vscale = h / maxHeight;
    }
    const fscale = Math.min(hscale, vscale);
    const newFontSize = fontSize * fscale;
    const buffer = ["q", `0 0 ${numberToString(w)} ${numberToString(h)} re W n`, `BT`, `1 0 0 1 0 ${numberToString(h + lineDescent)} Tm 0 Tc ${getPdfColor(bgColor, true)}`, `/${this.fontName.name} ${numberToString(newFontSize)} Tf`];
    const {
      resources
    } = this;
    strokeAlpha = typeof strokeAlpha === "number" && strokeAlpha >= 0 && strokeAlpha <= 1 ? strokeAlpha : 1;
    if (strokeAlpha !== 1) {
      buffer.push("/R0 gs");
      const extGState = new Dict(this.xref);
      const r0 = new Dict(this.xref);
      r0.set("ca", strokeAlpha);
      r0.set("CA", strokeAlpha);
      r0.set("Type", Name.get("ExtGState"));
      extGState.set("R0", r0);
      resources.set("ExtGState", extGState);
    }
    const vShift = numberToString(lineHeight);
    for (const line of lines) {
      buffer.push(`0 -${vShift} Td <${stringToUTF16HexString(line)}> Tj`);