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// Copyright (c) 2009 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_PDF_METAFILE_MAC_H_
#define PRINTING_PDF_METAFILE_MAC_H_
#include <ApplicationServices/ApplicationServices.h>
#include <CoreFoundation/CoreFoundation.h>
#include "base/basictypes.h"
#include "base/scoped_cftyperef.h"
namespace gfx {
class Rect;
}
class FilePath;
namespace printing {
// This class creates a graphics context that renders into a PDF data stream.
class PdfMetafile {
public:
// To create PDF data, callers should also call Init() to set up the
// rendering context.
// To create a metafile from existing Data, callers should also call
// Init(const void*, uint32).
PdfMetafile();
~PdfMetafile() {}
// Initializes a new metafile, and returns a drawing context for rendering
// into the PDF. Returns NULL on failure.
// Note: The returned context *must not be retained* past Close(). If it is,
// the data returned from GetData will not be valid PDF data.
CGContextRef Init();
// Initializes a copy of metafile from PDF data. Returns true on success.
bool Init(const void* src_buffer, uint32 src_buffer_size);
// Alias for Init, for compatibility with Emf-based code.
bool CreateFromData(const void* src_buffer, uint32 src_buffer_size);
// Prepares a new pdf page with the given width and height and a scale
// factor to use for the drawing.
void StartPage(double width, double height, double scale_factor);
// Closes the current page.
void FinishPage();
// Closes the PDF file; no further rendering is allowed.
void Close();
// Renders the given page into |rect| in the given context.
// Pages use a 1-based index. The rendering uses the following arguments
// to determine scaling and translation factors.
// |shrink_to_fit| specifies whether the output should be shrunk to fit the
// supplied |rect| if the page size is larger than |rect| in any dimension.
// If this is false, parts of the PDF page that lie outside the bounds will be
// clipped.
// |stretch_to_fit| specifies whether the output should be stretched to fit
// the supplied bounds if the page size is smaller than |rect| in all
// dimensions.
// |center_horizontally| specifies whether the final image (after any scaling
// is done) should be centered horizontally within the given |rect|.
// |center_vertically| specifies whether the final image (after any scaling
// is done) should be centered vertically within the given |rect|.
// Note that all scaling preserves the original aspect ratio of the page.
bool RenderPage(unsigned int page_number, CGContextRef context,
const CGRect rect, bool shrink_to_fit, bool stretch_to_fit,
bool center_horizontally, bool center_vertically) const;
unsigned int GetPageCount() const;
// Returns the bounds of the given page.
// Pages use a 1-based index.
gfx::Rect GetPageBounds(unsigned int page_number) const;
// Returns the size of the underlying PDF data. Only valid after Close() has
// been called.
uint32 GetDataSize() const;
// Copies the first |dst_buffer_size| bytes of the PDF data into |dst_buffer|.
// Only valid after Close() has been called.
// Returns true if the copy succeeds.
bool GetData(void* dst_buffer, uint32 dst_buffer_size) const;
// Saves the raw PDF data to the given file. For testing only.
// Returns true if writing succeeded.
bool SaveTo(const FilePath& file_path) const;
private:
// Returns a CGPDFDocumentRef version of pdf_data_.
CGPDFDocumentRef GetPDFDocument() const;
// Context for rendering to the pdf.
scoped_cftyperef<CGContextRef> context_;
// PDF backing store.
scoped_cftyperef<CFMutableDataRef> pdf_data_;
// Lazily-created CGPDFDocument representation of pdf_data_.
mutable scoped_cftyperef<CGPDFDocumentRef> pdf_doc_;
// Whether or not a page is currently open.
bool page_is_open_;
DISALLOW_COPY_AND_ASSIGN(PdfMetafile);
};
} // namespace printing
#endif // PRINTING_PDF_METAFILE_MAC_H_