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// Copyright (c) 2012 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 <map>
#include <memory>
#include "base/files/file_path.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/strings/string16.h"
#include "base/synchronization/lock.h"
#include "printing/native_drawing_context.h"
#include "printing/print_settings.h"
namespace base {
class RefCountedMemory;
class TaskRunner;
namespace printing {
class MetafilePlayer;
class PrintedPage;
class PrintedPagesSource;
class PrintingContext;
// A collection of rendered pages. The settings are immutable. If the print
// settings are changed, a new PrintedDocument must be created.
// Warning: May be accessed from many threads at the same time. Only one thread
// will have write access. Sensible functions are protected by a lock.
// Warning: Once a page is loaded, it cannot be replaced. Pages may be discarded
// under low memory conditions.
class PRINTING_EXPORT PrintedDocument
: public base::RefCountedThreadSafe<PrintedDocument> {
// The cookie shall be unique and has a specific relationship with its
// originating source and settings.
PrintedDocument(const PrintSettings& settings,
PrintedPagesSource* source,
int cookie,
base::TaskRunner* blocking_runner);
// Sets a page's data. 0-based. Takes metafile ownership.
// Note: locks for a short amount of time.
void SetPage(int page_number,
std::unique_ptr<MetafilePlayer> metafile,
#if defined(OS_WIN)
float shrink,
#endif // OS_WIN
const gfx::Size& paper_size,
const gfx::Rect& page_rect);
// Retrieves a page. If the page is not available right now, it
// requests to have this page be rendered and returns NULL.
// Note: locks for a short amount of time.
scoped_refptr<PrintedPage> GetPage(int page_number);
// Draws the page in the context.
// Note: locks for a short amount of time in debug only.
#if defined(OS_WIN) || defined(OS_MACOSX) && !defined(USE_AURA)
void RenderPrintedPage(const PrintedPage& page,
skia::NativeDrawingContext context) const;
#elif defined(OS_POSIX)
void RenderPrintedPage(const PrintedPage& page,
PrintingContext* context) const;
// Returns true if all the necessary pages for the settings are already
// rendered.
// Note: locks while parsing the whole tree.
bool IsComplete() const;
// Disconnects the PrintedPage source (PrintedPagesSource). It is done when
// the source is being destroyed.
void DisconnectSource();
// Sets the number of pages in the document to be rendered. Can only be set
// once.
// Note: locks for a short amount of time.
void set_page_count(int max_page);
// Number of pages in the document. Used for headers/footers.
// Note: locks for a short amount of time.
int page_count() const;
// Returns the number of expected pages to be rendered. It is a non-linear
// series if settings().ranges is not empty. It is the same value as
// document_page_count() otherwise.
// Note: locks for a short amount of time.
int expected_page_count() const;
// Getters. All these items are immutable hence thread-safe.
const PrintSettings& settings() const { return immutable_.settings_; }
const base::string16& name() const { return immutable_.name_; }
int cookie() const { return immutable_.cookie_; }
// Sets a path where to dump printing output files for debugging. If never set
// no files are generated.
static void set_debug_dump_path(const base::FilePath& debug_dump_path);
// Creates debug file name from given |document_name| and |extension|.
// |extension| should include '.', example ".pdf"
// Returns empty |base::FilePath| if debug dumps is not enabled.
static base::FilePath CreateDebugDumpPath(
const base::string16& document_name,
const base::FilePath::StringType& extension);
// Dump data on blocking task runner if debug dumps enabled.
void DebugDumpData(const base::RefCountedMemory* data,
const base::FilePath::StringType& extension);
friend class base::RefCountedThreadSafe<PrintedDocument>;
virtual ~PrintedDocument();
// Array of data for each print previewed page.
typedef std::map<int, scoped_refptr<PrintedPage> > PrintedPages;
// Contains all the mutable stuff. All this stuff MUST be accessed with the
// lock held.
struct Mutable {
explicit Mutable(PrintedPagesSource* source);
// Source that generates the PrintedPage's (i.e. a TabContents). It will be
// set back to NULL if the source is deleted before this object.
PrintedPagesSource* source_;
// Contains the pages' representation. This is a collection of PrintedPage.
// Warning: Lock must be held when accessing this member.
PrintedPages pages_;
// Number of expected pages to be rendered.
// Warning: Lock must be held when accessing this member.
int expected_page_count_;
// The total number of pages in the document.
int page_count_;
#if defined(OS_POSIX) && !defined(OS_MACOSX)
// Page number of the first page.
int first_page;
// Contains all the immutable stuff. All this stuff can be accessed without
// any lock held. This is because it can't be changed after the object's
// construction.
struct Immutable {
Immutable(const PrintSettings& settings,
PrintedPagesSource* source,
int cookie,
base::TaskRunner* blocking_runner);
// Print settings used to generate this document. Immutable.
PrintSettings settings_;
// Document name. Immutable.
base::string16 name_;
// Cookie to uniquely identify this document. It is used to make sure that a
// PrintedPage is correctly belonging to the PrintedDocument. Since
// PrintedPage generation is completely asynchronous, it could be easy to
// mess up and send the page to the wrong document. It can be viewed as a
// simpler hash of PrintSettings since a new document is made each time the
// print settings change.
int cookie_;
// Native thread for blocking operations, like file access.
scoped_refptr<base::TaskRunner> blocking_runner_;
// All writable data member access must be guarded by this lock. Needs to be
// mutable since it can be acquired from const member functions.
mutable base::Lock lock_;
// All the mutable members.
Mutable mutable_;
// All the immutable members.
const Immutable immutable_;
} // namespace printing