renderPageAsBytes method

Uint8List renderPageAsBytes(int width, int height, { int backgroundColor = 268435455, int rotate = 0, int flags = 0, })

Create empty bitmap and render page onto it The bitmap always uses 4 bytes per pixel. The first byte is always double word aligned. The byte order is BGRx (the last byte unused if no alpha channel) or BGRA. flags FPDF_ANNOT | FPDF_LCD_TEXT

Implementation

Uint8List renderPageAsBytes(int width, int height,
    {int backgroundColor = 268435455, int rotate = 0, int flags = 0,}) {
  if (_page == nullptr) {
    throw PdfiumException(message: 'Page not load');
  }
  // var backgroundStr = "FFFFFFFF"; // as int 268435455
  final w = width;
  final h = height;
  const startX = 0;
  final sizeX = w;
  const startY = 0;
  final sizeY = h;

  // Create empty bitmap and render page onto it
  // The bitmap always uses 4 bytes per pixel. The first byte is always
  // double word aligned.
  // The byte order is BGRx (the last byte unused if no alpha channel) or
  // BGRA. flags FPDF_ANNOT | FPDF_LCD_TEXT

  bitmap = pdfium.FPDFBitmap_Create(w, h, 0);
  pdfium.FPDFBitmap_FillRect(bitmap!, 0, 0, w, h, backgroundColor);
  pdfium.FPDF_RenderPageBitmap(
      bitmap!, _page!, startX, startY, sizeX, sizeY, rotate, flags,);
  //  The pointer to the first byte of the bitmap buffer The data is in BGRA format
  buffer = pdfium.FPDFBitmap_GetBuffer(bitmap!);
  //stride = width * 4 bytes per pixel BGRA
  //var stride = pdfium.FPDFBitmap_GetStride(bitmap);
  //print('stride $stride');
  final list = buffer!.asTypedList(w * h * 4);

  return list;
}