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// Copyright (c) 2011 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_NATIVE_METAFILE_LINUX_H_
#define PRINTING_NATIVE_METAFILE_LINUX_H_
#include "base/basictypes.h"
typedef struct _cairo_surface cairo_surface_t;
typedef struct _cairo cairo_t;
namespace base {
struct FileDescriptor;
}
class FilePath;
namespace printing {
// This class is used to generate a PDF stream and to store rendering results
// in a string buffer.
class NativeMetafile {
public:
virtual ~NativeMetafile() {}
// Initializes to a fresh new metafile. Returns true on success.
// Note: It should only be called from the renderer process to allocate
// rendering resources.
virtual bool Init() = 0;
// Initializes a copy of metafile from PDF stream data.
// Returns true on success.
// |src_buffer| should point to the shared memory which stores PDF
// contents generated in the renderer.
// Note: It should only be called from the browser process to initialize
// |data_|.
virtual bool Init(const void* src_buffer, uint32 src_buffer_size) = 0;
// Sets raw PDF data for the document. This is used when a cairo drawing
// surface has already been created. This method will cause all subsequent
// drawing on the surface to be discarded (in Close()). If Init() has not yet
// been called this method simply calls the second version of Init.
virtual bool SetRawData(const void* src_buffer, uint32 src_buffer_size) = 0;
// Prepares a new cairo surface/context for rendering a new page.
// The unit is in point (=1/72 in).
// Returns NULL when failed.
virtual cairo_t* StartPage(double width_in_points,
double height_in_points,
double margin_top_in_points,
double margin_right_in_points,
double margin_bottom_in_points,
double margin_left_in_points) = 0;
// Destroys the surface and the context used in rendering current page.
// The results of current page will be appended into buffer |data_|.
// Returns true on success.
virtual bool FinishPage() = 0;
// Closes resulting PDF file. No further rendering is allowed.
virtual void Close() = 0;
// Returns size of PDF contents stored in buffer |data_|.
// This function should ONLY be called after PDF file is closed.
virtual uint32 GetDataSize() const = 0;
// Copies PDF contents stored in buffer |data_| into |dst_buffer|.
// This function should ONLY be called after PDF file is closed.
// Returns true only when success.
virtual bool GetData(void* dst_buffer, uint32 dst_buffer_size) const = 0;
// Saves PDF contents stored in buffer |data_| into the file
// associated with |fd|.
// This function should ONLY be called after PDF file is closed.
virtual bool SaveTo(const base::FileDescriptor& fd) const = 0;
};
} // namespace printing
#endif // PRINTING_NATIVE_METAFILE_LINUX_H_
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