mirror of
https://github.com/wmjordan/PDFPatcher.git
synced 2026-10-18 21:52:34 +08:00
WMJ
283 lines
9.1 KiB
C#
283 lines
9.1 KiB
C#
using System;
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using System.IO;
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using System.Runtime.InteropServices;
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namespace MuPdfSharp
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{
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public sealed class MuDocument : IDisposable
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{
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#region 非托管资源成员
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StreamHandle _sourceStream;
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DocumentHandle _document;
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readonly ContextHandle _context;
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#endregion
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#region 托管资源成员
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/// <summary>获取所加载文档的路径。</summary>
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public string FilePath { get; private set; }
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/// <summary>获取文档的页数。</summary>
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public int PageCount { get; private set; }
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/// <summary>获取或设置抗锯齿显示级别。</summary>
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public int AntiAlias {
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get => NativeMethods.GetAntiAliasLevel(_context);
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set => NativeMethods.SetAntiAliasLevel(_context, value);
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}
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/// <summary>获取文件句柄是否打开。</summary>
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public bool IsDocumentOpened => _document.IsValid() && _sourceStream.IsValid();
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/// <summary>获取文档是否设置了打开密码。</summary>
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public bool NeedsPassword => NativeMethods.NeedsPdfPassword(_context, _document);
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public bool IsAuthenticated { get; private set; }
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public bool IsCancellationPending => _cookie.IsCancellationPending;
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object _SyncObj = new object();
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public object SyncObj => _SyncObj;
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internal ContextHandle Context => _context;
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MuPdfDictionary _trailer;
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internal MuPdfDictionary Trailer {
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get {
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if (_trailer == null) {
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_trailer = new MuPdfDictionary(_context, NativeMethods.GetTrailer(_context, _document));
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}
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return _trailer;
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}
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}
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internal MuPdfDictionary Root => Trailer["Root"].AsDictionary();
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internal MuDocumentInfo Info => new MuDocumentInfo(Trailer["Info"].AsDictionary());
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PageLabelCollection _PageLabels;
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/// <summary>
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/// 返回文档的页码标签。
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/// </summary>
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public PageLabelCollection PageLabels {
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get {
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if (_PageLabels == null) {
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_PageLabels = new PageLabelCollection(this);
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}
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return _PageLabels;
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}
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}
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MuCookie _cookie;
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#endregion
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public MuDocument(string fileName) : this() {
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LoadPdf(fileName, null);
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}
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public MuDocument(string fileName, string password) : this() {
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LoadPdf(fileName, password);
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}
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private MuDocument() {
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_context = ContextHandle.Create();
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_cookie = new MuCookie();
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NativeMethods.LoadSystemFontFuncs(_context, NativeMethods.LoadSystemFont, NativeMethods.LoadSystemCjkFont, NativeMethods.LoadSystemFallbackFont);
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PageCount = -1;
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}
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private int LoadPdf(string fileName, string password) {
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if (File.Exists(fileName) == false) {
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throw new FileNotFoundException("找不到 PDF 文件：" + fileName);
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}
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try {
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_sourceStream = new StreamHandle(_context, fileName);
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_document = new DocumentHandle(_context, _sourceStream);
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FilePath = fileName;
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return InitPdf(password);
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}
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catch (AccessViolationException) {
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_sourceStream.DisposeHandle();
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_document.DisposeHandle();
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throw new IOException("PDF 文件无效：" + fileName);
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}
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}
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/// <summary>
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/// 释放文档对应的句柄，不再占用 PDF 文件。
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/// </summary>
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public void ReleaseFile() {
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lock (_SyncObj) {
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_document.DisposeHandle();
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_sourceStream.DisposeHandle();
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}
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}
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/// <summary>
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/// 重新打开文件。
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/// </summary>
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public void Reopen() {
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lock (_SyncObj) {
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ReleaseFile();
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LoadPdf(FilePath, null);
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}
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}
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public void AbortAsync() {
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_cookie.CancelAsync();
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}
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/// <summary>
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/// 使用指定的尺寸渲染页面。
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/// </summary>
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/// <param name="pageNumber">需要渲染的页码。</param>
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/// <param name="size">图片尺寸。</param>
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/// <returns>渲染的图片。</returns>
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public FreeImageAPI.FreeImageBitmap RenderPage(int pageNumber, System.Drawing.Size size) {
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return RenderPage(pageNumber, size.Width, size.Height, null);
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}
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/// <summary>
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/// 使用指定的尺寸渲染页面。
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/// </summary>
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/// <param name="pageNumber">需要渲染的页码。</param>
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/// <param name="width">页面宽度。</param>
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/// <param name="height">页面高度。</param>
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/// <returns>渲染的图片。</returns>
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public FreeImageAPI.FreeImageBitmap RenderPage(int pageNumber, int width, int height) {
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return RenderPage(pageNumber, width, height, null);
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}
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/// <summary>
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/// 使用渲染配置渲染指定的页面。
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/// </summary>
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/// <param name="pageNumber">要渲染的页码。</param>
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/// <param name="width">页面宽度。</param>
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/// <param name="height">页面高度。</param>
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/// <param name="options">渲染选项。</param>
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/// <returns>成功渲染后的 <see cref="FreeImageAPI.FreeImageBitmap"/> 实例。如传入的页码在有效页码范围内，则返回空引用。</returns>
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public FreeImageAPI.FreeImageBitmap RenderPage(int pageNumber, int width, int height, ImageRendererOptions options) {
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if (pageNumber < 1 || pageNumber > PageCount) {
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return null;
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}
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using (var p = LoadPage(pageNumber)) {
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return options != null ? p.RenderPage(width, height, options) : p.RenderPage(width, height);
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}
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}
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public MuPage LoadPage(int pageNumber) {
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return new MuPage(_context, _document, pageNumber, ref _cookie);
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}
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public bool AuthenticatePassword(string password) {
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return IsAuthenticated =
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NativeMethods.NeedsPdfPassword(_context, _document) == false
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|| String.IsNullOrEmpty(password) == false && NativeMethods.AuthenticatePassword(_context, _document, password);
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}
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int InitPdf(string password) {
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AuthenticatePassword(password);
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PageCount = NativeMethods.CountPages(_context, _document);
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return PageCount;
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}
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#region 实现 IDisposable 接口的属性和方法
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private bool disposed;
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public bool IsDisposed => disposed;
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/// <summary>释放由 MuDocument 占用的资源。</summary>
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public void Dispose() {
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Dispose(true);
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GC.SuppressFinalize(this);
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}
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/// <summary>释放由 MuDocument 占用的资源。</summary>
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/// <param name="disposing">是否手动释放托管资源。</param>
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void Dispose(bool disposing) {
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if (!disposed) {
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if (disposing) {
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#region 释放托管资源
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_trailer = null;
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_SyncObj = null;
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if (_PageLabels != null) {
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_PageLabels.Clear();
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_PageLabels = null;
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}
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#endregion
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}
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#region 释放非托管资源
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// 注意这里不是线程安全的
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_document.DisposeHandle();
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_sourceStream.DisposeHandle();
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_context.DisposeHandle();
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#endregion
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}
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disposed = true;
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}
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// 析构函数只在未调用 Dispose 方法时调用
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// 派生类中不必再提供析构函数
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~MuDocument() {
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Dispose(false);
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}
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#endregion
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#region 生成对象
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public MuPdfObject Create(bool value) {
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return new MuPdfObject(_context, NativeMethods.NewBoolean(_context, _document, value ? 1 : 0));
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}
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public MuPdfObject Create(int value) {
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return new MuPdfObject(_context, NativeMethods.NewInteger(_context, _document, value));
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}
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public MuPdfObject Create(float value) {
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return new MuPdfObject(_context, NativeMethods.NewFloat(_context, _document, value));
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}
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public MuPdfObject Create(string value) {
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return new MuPdfObject(_context, NativeMethods.NewString(_context, _document, value, value.Length));
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}
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public MuPdfObject CreateName(string value) {
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return new MuPdfObject(_context, NativeMethods.NewName(_context, _document, value));
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}
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public MuPdfObject Create(int number, int generation) {
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return new MuPdfObject(_context, NativeMethods.NewIndirectReference(_context, _document, number, generation));
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}
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public MuPdfArray Create(Rectangle rect) {
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return new MuPdfArray(_context, NativeMethods.NewRect(_context, _document, rect));
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}
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public MuPdfArray Create(Matrix matrix) {
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return new MuPdfArray(_context, NativeMethods.NewMatrix(_context, _document, matrix));
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}
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public MuPdfArray CreateArray() {
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return new MuPdfArray(_context, NativeMethods.NewArray(_context, _document, 4));
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}
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public MuPdfDictionary CreateDictionary() {
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return new MuPdfDictionary(_context, NativeMethods.NewDictionary(_context, _document, 4));
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}
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#endregion
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unsafe struct FzFont
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{
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#pragma warning disable 649, 169
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readonly int refs;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)] readonly byte[] name;
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internal FzBuffer* Buffer;
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internal FzFontFlags Flags;
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#pragma warning restore 649, 169
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public string Name => System.Text.Encoding.Default.GetString(name, 0, Array.IndexOf(name, 0));
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}
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struct FzFontFlags
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{
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#pragma warning disable 649
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internal uint flag;
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#pragma warning restore 649
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bool IsMono => (flag & 1) > 0;
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bool IsSerif => (flag & 2) > 0;
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bool IsBold => (flag & 4) > 0;
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bool IsItalic => (flag & 8) > 0;
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bool IsSubstitute => (flag & 16) > 0; /* use substitute metrics */
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bool IsStretch => (flag & 32) > 0; /* stretch to match PDF metrics */
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bool IsFakeBold => (flag & 64) > 0; /* synthesize bold */
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bool IsFakeItalic => (flag & 128) > 0; /* synthesize italic */
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bool IsForcedHinting => (flag & 256) > 0; /* force hinting for DynaLab fonts */
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bool HasOpenType => (flag & 512) > 0; /* has opentype shaping tables */
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bool InvalidBBox => (flag & 1024) > 0;
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}
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struct FzBuffer
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{
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#pragma warning disable 649, 169
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readonly int refs;
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readonly IntPtr data;
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internal uint cap, len;
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readonly int unused_bits;
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readonly int shared;
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#pragma warning restore 649, 169
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}
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}
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}
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