THPDFHeadlessPageImportOptions
THPDFHeadlessPageImportOptions = record
FlattenAnnotations: Boolean;
MaxWorkingBytes: Int64;
class function Default: THPDFHeadlessPageImportOptions; static;
end;先用 Default 初始化;默认摊平普通注解 appearance,导入图形准备最多接受 268435456 保守工作字节