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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef PRINTING_EMF_WIN_H_
#define PRINTING_EMF_WIN_H_
#include <windows.h>
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include <vector>
#include "base/compiler_specific.h"
#include "base/component_export.h"
#include "base/gtest_prod_util.h"
#include "base/memory/raw_ptr.h"
#include "printing/metafile.h"
namespace base {
class FilePath;
}
namespace gfx {
class Rect;
class Size;
} // namespace gfx
namespace printing {
// Simple wrapper class that manage an EMF data stream and its virtual HDC.
class COMPONENT_EXPORT(PRINTING_METAFILE) Emf : public Metafile {
public:
class Record;
class Enumerator;
struct EnumerationContext;
// Generates a virtual HDC that will record every GDI commands and compile
// it in a EMF data stream.
Emf();
Emf(const Emf&) = delete;
Emf& operator=(const Emf&) = delete;
~Emf() override;
// Closes metafile.
void Close();
// Generates a new metafile that will record every GDI command, and will
// be saved to `metafile_path`.
bool InitToFile(const base::FilePath& metafile_path);
// Initializes the Emf with the data in `metafile_path`.
bool InitFromFile(const base::FilePath& metafile_path);
// Metafile methods.
bool Init() override;
bool InitFromData(base::span<const uint8_t> data) override;
// Inserts a custom GDICOMMENT records indicating StartPage/EndPage calls
// (since StartPage and EndPage do not work in a metafile DC). Only valid
// when hdc_ is non-NULL. `page_size`, `content_area`, and `scale_factor` are
// ignored.
void StartPage(const gfx::Size& page_size,
const gfx::Rect& content_area,
float scale_factor,
mojom::PageOrientation page_orientation) override;
bool FinishPage() override;
bool FinishDocument() override;
uint32_t GetDataSize() const override;
bool GetData(void* buffer, uint32_t size) const override;
bool ShouldCopySharedMemoryRegionData() const override;
mojom::MetafileDataType GetDataType() const override;
// Should be passed to Playback to keep the exact same size.
gfx::Rect GetPageBounds(unsigned int page_number) const override;
unsigned int GetPageCount() const override;
HDC context() const override;
bool Playback(HDC hdc, const RECT* rect) const override;
bool SafePlayback(HDC hdc) const override;
HENHMETAFILE emf() const { return emf_; }
private:
FRIEND_TEST_ALL_PREFIXES(EmfTest, DC);
FRIEND_TEST_ALL_PREFIXES(EmfPrintingTest, PageBreak);
FRIEND_TEST_ALL_PREFIXES(EmfTest, FileBackedEmf);
// Playbacks safely one EMF record.
static int CALLBACK SafePlaybackProc(HDC hdc,
HANDLETABLE* handle_table,
const ENHMETARECORD* record,
int objects_count,
LPARAM param);
// Compiled EMF data handle.
HENHMETAFILE emf_;
// Valid when generating EMF data through a virtual HDC.
HDC hdc_;
};
// Emf subclass that knows how to play back PostScript data embedded as EMF
// comment records.
class COMPONENT_EXPORT(PRINTING_METAFILE) PostScriptMetaFile : public Emf {
public:
PostScriptMetaFile();
PostScriptMetaFile(const PostScriptMetaFile&) = delete;
PostScriptMetaFile& operator=(const PostScriptMetaFile&) = delete;
~PostScriptMetaFile() override;
// `Emf` overrides:
mojom::MetafileDataType GetDataType() const override;
bool SafePlayback(HDC hdc) const override;
};
struct Emf::EnumerationContext {
EnumerationContext();
raw_ptr<HANDLETABLE> handle_table;
int objects_count;
HDC hdc;
raw_ptr<const XFORM> base_matrix;
int dc_on_page_start;
};
// One EMF record. It keeps pointers to the EMF buffer held by Emf::emf_.
// The entries become invalid once Emf::CloseEmf() is called.
class COMPONENT_EXPORT(PRINTING_METAFILE) Emf::Record {
public:
// Plays the record.
bool Play(EnumerationContext* context) const;
// Plays the record working around quirks with SetLayout,
// SetWorldTransform and ModifyWorldTransform. See implementation for details.
bool SafePlayback(EnumerationContext* context) const;
// Access the underlying EMF record.
const ENHMETARECORD* record() const { return record_; }
protected:
explicit Record(const ENHMETARECORD* record);
private:
friend class Emf;
friend class Enumerator;
raw_ptr<const ENHMETARECORD> record_;
};
// Retrieves individual records out of a Emf buffer. The main use is to skip
// over records that are unsupported on a specific printer or to play back
// only a part of an EMF buffer.
class COMPONENT_EXPORT(PRINTING_METAFILE) Emf::Enumerator {
public:
// Iterator type used for iterating the records.
typedef std::vector<Record>::const_iterator const_iterator;
// Enumerates the records at construction time. `hdc` and `rect` are
// both optional at the same time or must both be valid.
// Warning: `emf` must be kept valid for the time this object is alive.
Enumerator(const Emf& emf, HDC hdc, const RECT* rect);
Enumerator(const Enumerator&) = delete;
Enumerator& operator=(const Enumerator&) = delete;
~Enumerator();
// Retrieves the first Record.
const_iterator begin() const;
// Retrieves the end of the array.
const_iterator end() const;
private:
FRIEND_TEST_ALL_PREFIXES(EmfPrintingTest, Enumerate);
// Processes one EMF record and saves it in the items_ array.
static int CALLBACK EnhMetaFileProc(HDC hdc,
HANDLETABLE* handle_table,
const ENHMETARECORD* record,
int objects_count,
LPARAM param);
// The collection of every EMF records in the currently loaded EMF buffer.
// Initialized by Enumerate(). It keeps pointers to the EMF buffer held by
// Emf::emf_. The entries become invalid once Emf::CloseEmf() is called.
std::vector<Record> items_;
EnumerationContext context_;
};
} // namespace printing
#endif // PRINTING_EMF_WIN_H_
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