Windows: Make it possible to print text with GDI.

chrome/browser/printing/pdf_to_emf_converter.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/printing/pdf_to_emf_converter.h"
 
 #include <stdint.h>
+#include <windows.h>
 
 #include <memory>
 #include <queue>
 #include <utility>
 
 #include "base/files/file.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 80 matching lines @@
 // All these steps work sequentially, so no data should be accessed
 // simultaneously by several threads.
 class PdfToEmfUtilityProcessHostClient
     : public content::UtilityProcessHostClient {
  public:
   PdfToEmfUtilityProcessHostClient(
       base::WeakPtr<PdfToEmfConverterImpl> converter,
       const PdfRenderSettings& settings);
 
   void Start(const scoped_refptr<base::RefCountedMemory>& data,
+             bool print_text_with_gdi,
              const PdfToEmfConverter::StartCallback& start_callback);
 
   void GetPage(int page_number,
                const PdfToEmfConverter::GetPageCallback& get_page_callback);
 
   void Stop();
 
+  // Needs to be public to handle ChromeUtilityHostMsg_PreCacheFontCharacters
+  // sync message replies.
+  bool Send(IPC::Message* msg);
+
   // UtilityProcessHostClient implementation.
   void OnProcessCrashed(int exit_code) override;
   void OnProcessLaunchFailed(int exit_code) override;
   bool OnMessageReceived(const IPC::Message& message) override;
 
  private:
   class GetPageCallbackData {
    public:
     GetPageCallbackData(int page_number,
                         PdfToEmfConverter::GetPageCallback callback)
@@ skipping 20 matching lines @@
    private:
     int page_number_;
     PdfToEmfConverter::GetPageCallback callback_;
     ScopedTempFile emf_;
 
     DISALLOW_COPY_AND_ASSIGN(GetPageCallbackData);
   };
 
   ~PdfToEmfUtilityProcessHostClient() override;
 
-  bool Send(IPC::Message* msg);
-
   // Message handlers.
   void OnPageCount(int page_count);
   void OnPageDone(bool success, float scale_factor);
+  void OnPreCacheFontCharacters(const LOGFONT& log_font,
+                                const base::string16& characters);
 
   void OnFailed();
-  void OnTempPdfReady(ScopedTempFile pdf);
+  void OnTempPdfReady(bool print_text_with_gdi, ScopedTempFile pdf);
   void OnTempEmfReady(GetPageCallbackData* callback_data, ScopedTempFile emf);
 
   scoped_refptr<RefCountedTempDir> temp_dir_;
 
   // Used to suppress callbacks after PdfToEmfConverterImpl is deleted.
   base::WeakPtr<PdfToEmfConverterImpl> converter_;
   PdfRenderSettings settings_;
 
   // Document loaded callback.
   PdfToEmfConverter::StartCallback start_callback_;
@@ skipping 11 matching lines @@
 };
 
 class PdfToEmfConverterImpl : public PdfToEmfConverter {
  public:
   PdfToEmfConverterImpl();
 
   ~PdfToEmfConverterImpl() override;
 
   void Start(const scoped_refptr<base::RefCountedMemory>& data,
              const PdfRenderSettings& conversion_settings,
+             bool print_text_with_gdi,
              const StartCallback& start_callback) override;
 
   void GetPage(int page_number,
                const GetPageCallback& get_page_callback) override;
 
   // Helps to cancel callbacks if this object is destroyed.
   void RunCallback(const base::Closure& callback);
 
  private:
   scoped_refptr<PdfToEmfUtilityProcessHostClient> utility_client_;
@@ skipping 79 matching lines @@
     base::WeakPtr<PdfToEmfConverterImpl> converter,
     const PdfRenderSettings& settings)
     : converter_(converter), settings_(settings) {
 }
 
 PdfToEmfUtilityProcessHostClient::~PdfToEmfUtilityProcessHostClient() {
 }
 
 void PdfToEmfUtilityProcessHostClient::Start(
     const scoped_refptr<base::RefCountedMemory>& data,
+    bool print_text_with_gdi,
     const PdfToEmfConverter::StartCallback& start_callback) {
   if (!BrowserThread::CurrentlyOn(BrowserThread::IO)) {
-    BrowserThread::PostTask(BrowserThread::IO,
-                            FROM_HERE,
-                            base::Bind(&PdfToEmfUtilityProcessHostClient::Start,
-                                       this,
-                                       data,
-                                       start_callback));
+    BrowserThread::PostTask(
+        BrowserThread::IO, FROM_HERE,
+        base::Bind(&PdfToEmfUtilityProcessHostClient::Start, this, data,
+                   print_text_with_gdi, start_callback));
     return;
   }
 
   // Store callback before any OnFailed() call to make it called on failure.
   start_callback_ = start_callback;
 
   // NOTE: This process _must_ be sandboxed, otherwise the pdf dll will load
   // gdiplus.dll, change how rendering happens, and not be able to correctly
   // generate when sent to a metafile DC.
   utility_process_host_ = content::UtilityProcessHost::Create(
                               this, base::ThreadTaskRunnerHandle::Get())
                               ->AsWeakPtr();
   utility_process_host_->SetName(l10n_util::GetStringUTF16(
       IDS_UTILITY_PROCESS_EMF_CONVERTOR_NAME));
 
   BrowserThread::PostTaskAndReplyWithResult(
-      BrowserThread::FILE,
-      FROM_HERE,
+      BrowserThread::FILE, FROM_HERE,
       base::Bind(&CreateTempPdfFile, data, &temp_dir_),
-      base::Bind(&PdfToEmfUtilityProcessHostClient::OnTempPdfReady, this));
+      base::Bind(&PdfToEmfUtilityProcessHostClient::OnTempPdfReady, this,
+                 print_text_with_gdi));
 }
 
-void PdfToEmfUtilityProcessHostClient::OnTempPdfReady(ScopedTempFile pdf) {
+void PdfToEmfUtilityProcessHostClient::OnTempPdfReady(bool print_text_with_gdi,
+                                                      ScopedTempFile pdf) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   if (!utility_process_host_ || !pdf)
     return OnFailed();
   // Should reply with OnPageCount().
   Send(new ChromeUtilityMsg_RenderPDFPagesToMetafiles(
-      IPC::GetPlatformFileForTransit(pdf->GetPlatformFile(), false),
-      settings_));
+      IPC::GetPlatformFileForTransit(pdf->GetPlatformFile(), false), settings_,
+      print_text_with_gdi));
 }
 
 void PdfToEmfUtilityProcessHostClient::OnPageCount(int page_count) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   if (start_callback_.is_null())
     return OnFailed();
   BrowserThread::PostTask(BrowserThread::UI,
                           FROM_HERE,
                           base::Bind(&PdfToEmfConverterImpl::RunCallback,
                                      converter_,
@@ skipping 63 matching lines @@
                           FROM_HERE,
                           base::Bind(&PdfToEmfConverterImpl::RunCallback,
                                      converter_,
                                      base::Bind(data.callback(),
                                                 data.page_number(),
                                                 scale_factor,
                                                 base::Passed(&emf))));
   get_page_callbacks_.pop();
 }
 
+void PdfToEmfUtilityProcessHostClient::OnPreCacheFontCharacters(
+    const LOGFONT& font,
+    const base::string16& str) {
+  // TODO(scottmg): pdf/ppapi still require the renderer to be able to precache
+  // GDI fonts (http://crbug.com/383227), even when using DirectWrite.
+  // Eventually this shouldn't be added and should be moved to
+  // FontCacheDispatcher too. http://crbug.com/356346.
+
+  // First, comments from FontCacheDispatcher::OnPreCacheFont do apply here too.
+  // Except that for True Type fonts,
+  // GetTextMetrics will not load the font in memory.
+  // The only way windows seem to load properly, it is to create a similar
+  // device (like the one in which we print), then do an ExtTextOut,
+  // as we do in the printing thread, which is sandboxed.
+  HDC hdc = CreateEnhMetaFile(nullptr, nullptr, nullptr, nullptr);
+  HFONT font_handle = CreateFontIndirect(&font);
+  DCHECK(font_handle != nullptr);
+
+  HGDIOBJ old_font = SelectObject(hdc, font_handle);
+  DCHECK(old_font != nullptr);
+
+  ExtTextOut(hdc, 0, 0, ETO_GLYPH_INDEX, 0, str.c_str(), str.length(), nullptr);
+
+  SelectObject(hdc, old_font);
+  DeleteObject(font_handle);
+
+  HENHMETAFILE metafile = CloseEnhMetaFile(hdc);
+
+  if (metafile)
+    DeleteEnhMetaFile(metafile);
+}
+
 void PdfToEmfUtilityProcessHostClient::Stop() {
   if (!BrowserThread::CurrentlyOn(BrowserThread::IO)) {
     BrowserThread::PostTask(
         BrowserThread::IO,
         FROM_HERE,
         base::Bind(&PdfToEmfUtilityProcessHostClient::Stop, this));
     return;
   }
   Send(new ChromeUtilityMsg_RenderPDFPagesToMetafiles_Stop());
 }
 
 void PdfToEmfUtilityProcessHostClient::OnProcessCrashed(int exit_code) {
   OnFailed();
 }
 
 void PdfToEmfUtilityProcessHostClient::OnProcessLaunchFailed(int exit_code) {
   OnFailed();
 }
 
 bool PdfToEmfUtilityProcessHostClient::OnMessageReceived(
     const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(PdfToEmfUtilityProcessHostClient, message)
     IPC_MESSAGE_HANDLER(
         ChromeUtilityHostMsg_RenderPDFPagesToMetafiles_PageCount, OnPageCount)
     IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_RenderPDFPagesToMetafiles_PageDone,
                         OnPageDone)
+    IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_PreCacheFontCharacters,
+                        OnPreCacheFontCharacters)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 bool PdfToEmfUtilityProcessHostClient::Send(IPC::Message* msg) {
   if (utility_process_host_)
     return utility_process_host_->Send(msg);
   delete msg;
   return false;
@@ skipping 12 matching lines @@
 }
 
 PdfToEmfConverterImpl::~PdfToEmfConverterImpl() {
   if (utility_client_.get())
     utility_client_->Stop();
 }
 
 void PdfToEmfConverterImpl::Start(
     const scoped_refptr<base::RefCountedMemory>& data,
     const PdfRenderSettings& conversion_settings,
+    bool print_text_with_gdi,
     const StartCallback& start_callback) {
   DCHECK(!utility_client_.get());
   utility_client_ = new PdfToEmfUtilityProcessHostClient(
       weak_ptr_factory_.GetWeakPtr(), conversion_settings);
-  utility_client_->Start(data, start_callback);
+  utility_client_->Start(data, print_text_with_gdi, start_callback);
 }
 
 void PdfToEmfConverterImpl::GetPage(int page_number,
                                     const GetPageCallback& get_page_callback) {
   utility_client_->GetPage(page_number, get_page_callback);
 }
 
 void PdfToEmfConverterImpl::RunCallback(const base::Closure& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   callback.Run();
 }
 
 }  // namespace
 
 PdfToEmfConverter::~PdfToEmfConverter() {
 }
 
 // static
 std::unique_ptr<PdfToEmfConverter> PdfToEmfConverter::CreateDefault() {
   return std::unique_ptr<PdfToEmfConverter>(new PdfToEmfConverterImpl());
 }
 
 }  // namespace printing