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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.
#ifndef PRINTING_EMF_WIN_H_
#define PRINTING_EMF_WIN_H_
#include <windows.h>
#include <stddef.h>
#include <stdint.h>
#include <vector>
#include "base/compiler_specific.h"
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "printing/metafile.h"
namespace base {
class FilePath;
}
namespace gfx {
class Rect;
class Size;
}
namespace printing {
// http://msdn2.microsoft.com/en-us/library/ms535522.aspx
// Windows 2000/XP: When a page in a spooled file exceeds approximately 350
// MB, it can fail to print and not send an error message.
const size_t kMetafileMaxSize = 350*1024*1024;
// Simple wrapper class that manage an EMF data stream and its virtual HDC.
class PRINTING_EXPORT 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() 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(const void* src_buffer,
uint32_t src_buffer_size) 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.
bool StartPage(const gfx::Size& page_size,
const gfx::Rect& content_area,
const float& scale_factor) override;
bool FinishPage() override;
bool FinishDocument() override;
uint32_t GetDataSize() const override;
bool GetData(void* buffer, uint32_t size) 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_; }
// Returns true if metafile contains alpha blend.
bool IsAlphaBlendUsed() const;
// Returns new metafile with only bitmap created by playback of the current
// metafile. Returns NULL if fails.
scoped_ptr<Emf> RasterizeMetafile(int raster_area_in_pixels) const;
// Returns new metafile where AlphaBlend replaced by bitmaps. Returns NULL
// if fails.
scoped_ptr<Emf> RasterizeAlphaBlend() const;
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_;
DISALLOW_COPY_AND_ASSIGN(Emf);
};
struct Emf::EnumerationContext {
EnumerationContext();
HANDLETABLE* handle_table;
int objects_count;
HDC hdc;
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 PRINTING_EXPORT 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;
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 PRINTING_EXPORT 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();
// 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_;
DISALLOW_COPY_AND_ASSIGN(Enumerator);
};
} // namespace printing
#endif // PRINTING_EMF_WIN_H_
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