libcairomm-1.0-dev 1.10.0-1ubuntu3 / usr / include / cairomm-1.0 / cairomm / surface.h

/* Copyright (C) 2005 The cairomm Development Team
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#ifndef __CAIROMM_SURFACE_H
#define __CAIROMM_SURFACE_H

#include <string>
#include <vector>

/* following is required for OS X */

#ifdef nil
#undef nil
#endif

/* end OS X */

#include <sigc++/slot.h>
#include <cairomm/enums.h>
#include <cairomm/exception.h>
#include <cairomm/device.h>
#include <cairomm/fontoptions.h>
#include <cairomm/refptr.h>

//See xlib_surface.h for XlibSurface.
//See win32_surface.h for Win32Surface.
//See quartz_surface.h for QuartzSurface (Mac OS X).

#ifdef CAIRO_HAS_PDF_SURFACE
#include <cairo-pdf.h>
#endif // CAIRO_HAS_PDF_SURFACE
#ifdef CAIRO_HAS_PS_SURFACE
#include <cairo-ps.h>
#endif // CAIRO_HAS_PS_SURFACE
#ifdef CAIRO_HAS_SVG_SURFACE
#include <cairo-svg.h>
#endif // CAIRO_HAS_SVG_SURFACE

// Experimental surfaces
#ifdef CAIRO_HAS_GLITZ_SURFACE
#include <cairo-glitz.h>
#endif // CAIRO_HAS_GLITZ_SURFACE


namespace Cairo
{

/** A cairo surface represents an image, either as the destination of a drawing
 * operation or as source when drawing onto another surface. There are
 * different subtypes of cairo surface for different drawing backends.  This
 * class is a base class for all subtypes and should not be used directly
 *
 * Surfaces are reference-counted objects that should be used via Cairo::RefPtr.
 */
class Surface
{
public:
  /** For example:
   * <code>
   * ErrorStatus my_write_func(unsigned char* data, unsigned int length);
   * </code>
   *
   * This is the type of function which is called when a backend needs to write
   * data to an output stream. It is passed the data to write and the length of
   * the data in bytes. The write function should return CAIRO_STATUS_SUCCESS if
   * all the data was successfully written, CAIRO_STATUS_WRITE_ERROR otherwise.
   *
   * @param data the buffer containing the data to write
   * @param length the amount of data to write
   * @return the status code of the write operation
   */
  typedef sigc::slot<ErrorStatus, const unsigned char* /*data*/, unsigned int /*length*/> SlotWriteFunc;
  /**
   * This is the type of function which is called when a backend needs to read
   * data from an input stream. It is passed the buffer to read the data into
   * and the length of the data in bytes. The read function should return
   * CAIRO_STATUS_SUCCESS if all the data was successfully read,
   * CAIRO_STATUS_READ_ERROR otherwise.
   *
   * @param data the buffer into which to read the data
   * @param length the amount of data to read
   * @return the status code of the read operation
   */
  typedef sigc::slot<ErrorStatus, unsigned char* /*data*/, unsigned int /*length*/> SlotReadFunc;

  /** Create a C++ wrapper for the C instance. This C++ instance should then be
   * given to a RefPtr.
   *
   * @param cobject The C instance.
   * @param has_reference Whether we already have a reference. Otherwise, the
   * constructor will take an extra reference.
   */
  explicit Surface(cairo_surface_t* cobject, bool has_reference = false);

  virtual ~Surface();

  /** Return mime data previously attached to surface using the specified mime type. If no data has been attached with the given mime type then this returns 0.
   *
   * @param mime_type The MIME type of the image data.
   * @param length This will be set to the length of the image data.
   * @result The image data attached to the surface.
   */
  const unsigned char* get_mime_data(const std::string& mime_type, unsigned long& length);


  /** For instance,
   * void on_destroy();
   */
  typedef sigc::slot<void> SlotDestroy;

  /** Attach an image in the format mime_type to surface. To remove the data from
   * a surface, call unset_mime_data() with same mime type.
   *
   * The attached image (or filename) data can later be used by backends which
   * support it (currently: PDF, PS, SVG and Win32 Printing surfaces) to emit
   * this data instead of making a snapshot of the surface. This approach tends
   * to be faster and requires less memory and disk space.
   *
   * The recognized MIME types are the following: CAIRO_MIME_TYPE_JPEG,
   * CAIRO_MIME_TYPE_PNG, CAIRO_MIME_TYPE_JP2, CAIRO_MIME_TYPE_URI.
   *
   * See corresponding backend surface docs for details about which MIME types
   * it can handle. Caution: the associated MIME data will be discarded if you
   * draw on the surface afterwards. Use this function with care.
   *
   * @param mime_type The MIME type of the image data.
   * @param data The image data to attach to the surface.
   * @param length The length of the image data.
   * @param slot_destroy A callback slot that will be called when the Surface no longer needs the data. For instance, when the Surface is destroyed or when new image data is attached using the same MIME tpe.
   */
  void set_mime_data(const std::string& mime_type, unsigned char* data, unsigned long length, const SlotDestroy& slot_destroy);

  /** Remove the data from a surface. See set_mime_data().
   */
  void unset_mime_data(const std::string& mime_type);

  /** Retrieves the default font rendering options for the surface. This allows
   * display surfaces to report the correct subpixel order for rendering on
   * them, print surfaces to disable hinting of metrics and so forth. The
   * result can then be used with cairo_scaled_font_create().
   *
   * @param options 	a FontOptions object into which to store the retrieved
   * options. All existing values are overwritten
   */
  void get_font_options(FontOptions& options) const;

  /** This function finishes the surface and drops all references to external
   * resources. For example, for the Xlib backend it means that cairo will no
   * longer access the drawable, which can be freed. After calling
   * finish() the only valid operations on a surface are getting and setting
   * user data and referencing and destroying it. Further drawing to the
   * surface will not affect the surface but will instead trigger a
   * CAIRO_STATUS_SURFACE_FINISHED error.
   *
   * When the Surface is destroyed, cairo will call finish() if it hasn't been
   * called already, before freeing the resources associated with the Surface.
   */
  void finish();

  /** Do any pending drawing for the surface and also restore any temporary
   * modifications cairo has made to the surface's state. This function must
   * be called before switching from drawing on the surface with cairo to
   * drawing on it directly with native APIs. If the surface doesn't support
   * direct access, then this function does nothing.
   */
  void flush();

  /** Tells cairo to consider the data buffer dirty.
   *
   * In particular, if you've created an ImageSurface with a data buffer that
   * you've allocated yourself and you draw to that data buffer using means
   * other than cairo, you must call mark_dirty() before doing any additional
   * drawing to that surface with cairo.
   *
   * Note that if you do draw to the Surface outside of cairo, you must call
   * flush() before doing the drawing.
   */
  void mark_dirty();

  /** Marks a rectangular area of the given surface dirty.
   *
   * @param x 	 X coordinate of dirty rectangle
   * @param y 	Y coordinate of dirty rectangle
   * @param width 	width of dirty rectangle
   * @param height 	height of dirty rectangle
   */
  void mark_dirty(int x, int y, int width, int height);

  /** Sets an offset that is added to the device coordinates determined by the
   * CTM when drawing to surface. One use case for this function is when we
   * want to create a Surface that redirects drawing for a portion of
   * an onscreen surface to an offscreen surface in a way that is completely
   * invisible to the user of the cairo API. Setting a transformation via
   * cairo_translate() isn't sufficient to do this, since functions like
   * Cairo::Context::device_to_user() will expose the hidden offset.
   *
   * Note that the offset only affects drawing to the surface, not using the
   * surface in a surface pattern.
   *
   * @param x_offset 	the offset in the X direction, in device units
   * @param y_offset 	the offset in the Y direction, in device units
   */
  void set_device_offset(double x_offset, double y_offset);

  /** Returns a previous device offset set by set_device_offset().
   */
  void get_device_offset(double& x_offset, double& y_offset) const;

  /** Sets the fallback resolution of the image in dots per inch
   *
   * @param x_pixels_per_inch   Pixels per inch in the x direction
   * @param y_pixels_per_inch   Pixels per inch in the y direction
   */
  void set_fallback_resolution(double x_pixels_per_inch, double y_pixels_per_inch);

  /** This function returns the previous fallback resolution set by
   * set_fallback_resolution(), or default fallback resolution if never set.
   *
   * @param x_pixels_per_inch horizontal pixels per inch
   * @param y_pixels_per_inch vertical pixels per inch
   *
   * @since 1.8
   */
  void get_fallback_resolution(double& x_pixels_per_inch, double& y_pixels_per_inch) const;

  SurfaceType get_type() const;

  /**This function returns the content type of surface which indicates whether
   * the surface contains color and/or alpha information.
   *
   * @since 1.8
   */
  Content get_content() const;

  /**
   * Emits the current page for backends that support multiple pages,
   * but doesn't clear it, so that the contents of the current page will
   * be retained for the next page.  Use show_page() if you want to get an empty
   * page after the emission.
   *
   * @since 1.6
   */
  void copy_page();

  /**
   * Emits and clears the current page for backends that support multiple pages.
   * Use copy_page() if you don't want to clear the page.
   *
   * @since 1.6
   */
  void show_page();

  /** Returns whether the surface supports sophisticated
   * Context::show_text_glyphs() operations.  That is, whether it actually uses
   * the provided text and cluster data to a Context::show_text_glyphs() call.
   *
   * Note: Even if this function returns %FALSE, a Context::show_text_glyphs()
   * operation targeted at this surface will still succeed.  It just will act
   * like a Context::show_glyphs() operation.  Users can use this function to
   * avoid computing UTF-8 text and cluster mapping if the target surface does
   * not use it.
   *
   * @since 1.8
   **/
  bool has_show_text_glyphs() const;

#ifdef CAIRO_HAS_PNG_FUNCTIONS

  /** Writes the contents of surface to a new file filename as a PNG image.
   *
   * @note For this function to be available, cairo must have been compiled
   * with PNG support
   *
   * @param filename	the name of a file to write to
   */
  void write_to_png(const std::string& filename);

  /** Writes the Surface to the write function.
   *
   * @note For this function to be available, cairo must have been compiled
   * with PNG support
   *
   * @param write_func  The function to be called when the backend needs to
   * write data to an output stream
   *
   * @since 1.8
   */
  void write_to_png_stream(const SlotWriteFunc& write_func);

  /** @deprecated Use write_to_png_stream instead */
  void write_to_png(cairo_write_func_t write_func, void *closure);

#endif // CAIRO_HAS_PNG_FUNCTIONS

  /** This function returns the device for a surface
   * @return The device for this surface, or an empty RefPtr if the surface has
   * no associated device */
  RefPtr<Device> get_device();

  /** The underlying C cairo surface type
   */
  typedef cairo_surface_t cobject;
  /** Provides acces to the underlying C cairo surface
   */
  inline cobject* cobj() { return m_cobject; }
  /** Provides acces to the underlying C cairo surface
   */
  inline const cobject* cobj() const { return m_cobject; }

  #ifndef DOXYGEN_IGNORE_THIS
  ///For use only by the cairomm implementation.
  inline ErrorStatus get_status() const
  { return cairo_surface_status(const_cast<cairo_surface_t*>(cobj())); }

  void reference() const;
  void unreference() const;
  #endif //DOXYGEN_IGNORE_THIS

  /** Create a new surface that is as compatible as possible with an existing
   * surface. The new surface will use the same backend as other unless that is
   * not possible for some reason.
   *
   * @param other 	an existing surface used to select the backend of the new surface
   * @param content 	the content for the new surface
   * @param width 	width of the new surface, (in device-space units)
   * @param height 	height of the new surface (in device-space units)
   * @return 	a RefPtr to the newly allocated surface.
   */
  static RefPtr<Surface> create(const RefPtr<Surface> other, Content content, int width, int height);

  /** Create a new surface that is a rectangle within the target surface. All
   * operations drawn to this surface are then clipped and translated onto the
   * target surface. Nothing drawn via this sub-surface outside of its bounds is
   * drawn onto the target surface, making this a useful method for passing
   * constrained child surfaces to library routines that draw directly onto the
   * parent surface, i.e. with no further backend allocations, double buffering
   * or copies.
   *
   * @Note The semantics of subsurfaces have not been finalized yet unless the
   * rectangle is in full device units, is contained within the extents of the
   * target surface, and the target or subsurface's device transforms are not
   * changed.
   *
   * @param target an existing surface for which the sub-surface will point to
   * @param x the x-origin of the sub-surface from the top-left of the target surface (in device-space units)
   * @param y the y-origin of the sub-surface from the top-left of the target surface (in device-space units)
   * @param width width of the sub-surface (in device-space units)
   * @param height height of the sub-surface (in device-space units)
   *
   * @since 1.10
   */
  static RefPtr<Surface> create(const RefPtr<Surface>& target, double x, double y, double width, double height);

protected:
  /** The underlying C cairo surface type that is wrapped by this Surface
   */
  cobject* m_cobject;

private:
  Surface(const Surface&);
  Surface& operator=(const Surface&);
};

/** @example image-surface.cc
 * An example of using Cairo::ImageSurface class to render to PNG
 */

/** Image surfaces provide the ability to render to memory buffers either
 * allocated by cairo or by the calling code. The supported image formats are
 * those defined in Cairo::Format
 *
 * An ImageSurface is the most generic type of Surface and the only one that is
 * available by default.  You can either create an ImageSurface whose data is
 * managed by Cairo, or you can create an ImageSurface with a data buffer that
 * you allocated yourself so that you can have full access to the data.
 *
 * When you create an ImageSurface with your own data buffer, you are free to
 * examine the results at any point and do whatever you want with it.  Note that
 * if you modify anything and later want to continue to draw to the surface
 * with cairo, you must let cairo know via Cairo::Surface::mark_dirty()
 *
 * Note that like all surfaces, an ImageSurface is a reference-counted object that should be used via Cairo::RefPtr.
 */
class ImageSurface : public Surface
{
protected:
  //TODO?: Surface(cairo_surface_t *target);

public:

  /** Create a C++ wrapper for the C instance. This C++ instance should then be
   * given to a RefPtr.
   * @param cobject The C instance.
   * @param has_reference Whether we already have a reference. Otherwise, the
   * constructor will take an extra reference.
   */
  explicit ImageSurface(cairo_surface_t* cobject, bool has_reference = false);

  virtual ~ImageSurface();

  /** Gets the width of the ImageSurface in pixels
   */
  int get_width() const;

  /** Gets the height of the ImageSurface in pixels
   */
  int get_height() const;

  /**
   * Get a pointer to the data of the image surface, for direct
   * inspection or modification.
   *
   * Return value: a pointer to the image data of this surface or NULL
   * if @surface is not an image surface.
   */
  unsigned char* get_data();
  const unsigned char* get_data() const;

  /** gets the format of the surface
   */
  Format get_format() const;

  /**
   * Return value: the stride of the image surface in bytes (or 0 if
   * @surface is not an image surface). The stride is the distance in
   * bytes from the beginning of one row of the image data to the
   * beginning of the next row.
   */
  int get_stride() const;

  /**
   * This function provides a stride value that will respect all
   * alignment requirements of the accelerated image-rendering code
   * within cairo. Typical usage will be of the form:
   *
   * @code
   * int stride;
   * unsigned char *data;
   * Cairo::RefPtr<Cairo::ImageSurface> surface;
   *
   * stride = Cairo::ImageSurface::format_stride_for_width (format, width);
   * data = malloc (stride * height);
   * surface = Cairo::ImageSurface::create (data, format, width, height);
   * @endcode
   *
   * @param format A Cairo::Format value
   * @param width The desired width of an image surface to be created.
   * @return the appropriate stride to use given the desired format and width, or
   * -1 if either the format is invalid or the width too large.
   *
   * @since 1.6
   **/
  static int format_stride_for_width (Cairo::Format format, int width);

  /**
   * Creates an image surface of the specified format and dimensions. Initially
   * the surface contents are all 0. (Specifically, within each pixel, each
   * color or alpha channel belonging to format will be 0. The contents of bits
   * within a pixel, but not belonging to the given format are undefined).
   *
   * @param format 	format of pixels in the surface to create
   * @param width 	width of the surface, in pixels
   * @param height 	height of the surface, in pixels
   * @return 	a RefPtr to the newly created surface.
   */
  static RefPtr<ImageSurface> create(Format format, int width, int height);

  /**
   * Creates an image surface for the provided pixel data. The output buffer
   * must be kept around until the surface is destroyed or finish() is called on
   * the surface. The initial contents of buffer will be used as the initial
   * image contents; you must explicitly clear the buffer, using, for example,
   * Context::rectangle() and Context::fill() if you want it cleared.
   *
   * Note that the stride may be larger than @a width * @a bytes_per_pixel to
   * provide proper alignment for each pixel and row. This alignment is required
   * to allow high-performance rendering within cairo. The correct way to obtain
   * a legal stride value is to call format_stride_for_width() with the desired
   * format and maximum image width value, and the use the resulting stride
   * value to allocate the data and to create the image surface. See
   * format_stride_for_width() for example code.
   *
   * @param data a pointer to a buffer supplied by the application in which to write contents. This pointer must be suitably aligned for any kind of variable, (for example, a pointer returned by malloc).
   * @param format the format of pixels in the buffer
   * @param width the width of the image to be stored in the buffer
   * @param height the height of the image to be stored in the buffer
   * @param stride the number of bytes between the start of rows in the buffer as allocated. This value should always be computed by cairo_format_stride_for_width() before allocating the data buffer.
   * @return a RefPtr to the newly created surface.
   */
  static RefPtr<ImageSurface> create(unsigned char* data, Format format, int width, int height, int stride);

#ifdef CAIRO_HAS_PNG_FUNCTIONS

  /** Creates a new image surface and initializes the contents to the given PNG
   * file.
   *
   * @note For this function to be available, cairo must have been compiled
   * with PNG support.
   *
   * @param filename	name of PNG file to load
   * @return	a RefPtr to the new cairo_surface_t initialized with the
   * contents of the PNG image file.
   */
  static RefPtr<ImageSurface> create_from_png(std::string filename);

  /** Creates a new image surface from PNG data read incrementally via the
   * read_func function.
   *
   * @note For this function to be available, cairo must have been compiled
   * with PNG support.
   *
   * @param read_func function called to read the data of the file
   * @return a RefPtr to the new cairo_surface_t initialized with the
   * contents of the PNG image file.
   */
  static RefPtr<ImageSurface> create_from_png_stream(const SlotReadFunc& read_func);
  /** @deprecated Use create_from_png_stream instead */
  static RefPtr<ImageSurface> create_from_png(cairo_read_func_t read_func, void *closure);

#endif // CAIRO_HAS_PNG_FUNCTIONS

};


#ifdef CAIRO_HAS_PDF_SURFACE

/** @example pdf-surface.cc
 * An example of using Cairo::PdfSurface class to render to PDF
 */

typedef enum
{
  PDF_VERSION_1_4 = CAIRO_PDF_VERSION_1_4,
  PDF_VERSION_1_5 = CAIRO_PDF_VERSION_1_5
} PdfVersion;

/** A PdfSurface provides a way to render PDF documents from cairo.  This
 * surface is not rendered to the screen but instead renders the drawing to a
 * PDF file on disk.
 *
 * @note For this Surface to be available, cairo must have been compiled with
 * PDF support
 */
class PdfSurface : public Surface
{
public:

  /** Create a C++ wrapper for the C instance. This C++ instance should then be
   * given to a RefPtr.
   *
   * @param cobject The C instance.
   * @param has_reference whether we already have a reference. Otherwise, the
   * constructor will take an extra reference.
   */
  explicit PdfSurface(cairo_surface_t* cobject, bool has_reference = false);
  virtual ~PdfSurface();

  /** Creates a PdfSurface with a specified dimensions that will be saved as
   * the given filename
   *
   * @param filename    The name of the PDF file to save the surface to
   * @param width_in_points   The width of the PDF document in points
   * @param height_in_points   The height of the PDF document in points
   */
  static RefPtr<PdfSurface> create(std::string filename, double width_in_points, double height_in_points);

  /** Creates a PdfSurface with a specified dimensions that will be written to
   * the given write function instead of saved directly to disk
   *
   * @param write_func  The function to be called when the backend needs to
   * write data to an output stream
   * @param width_in_points   The width of the PDF document in points
   * @param height_in_points   The height of the PDF document in points
   *
   * @since 1.8
   */
  static RefPtr<PdfSurface> create_for_stream(const SlotWriteFunc& write_func, double width_in_points, double height_in_points);
  /** @deprecated use PdfSurface::create_for_stream() instead */
  static RefPtr<PdfSurface> create(cairo_write_func_t write_func, void *closure, double width_in_points, double height_in_points);

/**
 * Changes the size of a PDF surface for the current (and subsequent) pages.
 *
 * This function should only be called before any drawing operations have been
 * performed on the current page. The simplest way to do this is to call this
 * function immediately after creating the surface or immediately after
 * completing a page with either Context::show_page() or Context::copy_page().
 *
 * @param width_in_points new surface width, in points (1 point == 1/72.0 inch)
 * @param height_in_points new surface height, in points (1 point == 1/72.0 inch)
 **/
  void set_size(double width_in_points, double height_in_points);

  /**
   * Restricts the generated PDF file to version. See get_versions() for a list
   * of available version values that can be used here.
   *
   * This function should only be called before any drawing operations have been
   * performed on the given surface. The simplest way to do this is to call this
   * function immediately after creating the surface.
   *
   * @since 1.10
   */
  void restrict_to_version(PdfVersion version);

  /** Retrieves the list of PDF versions supported by cairo. See
   * restrict_to_version().
   *
   * @since 1.10
   */
  static const std::vector<PdfVersion> get_versions();

  /** Get the string representation of the given version id. This function will
   * return an empty string if version isn't valid. See get_versions()
   * for a way to get the list of valid version ids.
   *
   * @since 1.10
   */
  static std::string version_to_string(PdfVersion version);
};

#endif  // CAIRO_HAS_PDF_SURFACE


#ifdef CAIRO_HAS_PS_SURFACE

/** @example ps-surface.cc
 * An example of using Cairo::PsSurface class to render to PostScript
 */

/**
 * describes the language level of the PostScript Language Reference that a
 * generated PostScript file will conform to.
 */
typedef enum {
    PS_LEVEL_2 = CAIRO_PS_LEVEL_2,
    PS_LEVEL_3 = CAIRO_PS_LEVEL_3
} PsLevel;

/** A PsSurface provides a way to render PostScript documents from cairo.  This
 * surface is not rendered to the screen but instead renders the drawing to a
 * PostScript file on disk.
 *
 * @note For this Surface to be available, cairo must have been compiled with
 * PostScript support
 */
class PsSurface : public Surface
{
public:

  /** Create a C++ wrapper for the C instance. This C++ instance should then be
   * given to a RefPtr.
   *
   * @param cobject The C instance.
   * @param has_reference whether we already have a reference. Otherwise, the
   * constructor will take an extra reference.
   */
  explicit PsSurface(cairo_surface_t* cobject, bool has_reference = false);
  virtual ~PsSurface();

  /** Creates a PsSurface with a specified dimensions that will be saved as the
   * given filename
   *
   * @param filename    The name of the PostScript file to save the surface to
   * @param width_in_points   The width of the PostScript document in points
   * @param height_in_points   The height of the PostScript document in points
   */
  static RefPtr<PsSurface> create(std::string filename, double width_in_points, double height_in_points);

  /** Creates a PsSurface with a specified dimensions that will be written to
   * the given write function instead of saved directly to disk
   *
   * @param write_func  The function to be called when the backend needs to
   * write data to an output stream
   * @param width_in_points   The width of the PostScript document in points
   * @param height_in_points   The height of the PostScript document in points
   *
   * @since 1.8
   */
  static RefPtr<PsSurface> create_for_stream(const SlotWriteFunc& write_func, double width_in_points, double height_in_points);
  /** @deprecated use PsSurface::create_for_stream() instead */
  static RefPtr<PsSurface> create(cairo_write_func_t write_func, void *closure, double width_in_points, double height_in_points);

  /**
   * Changes the size of a PostScript surface for the current (and
   * subsequent) pages.
   *
   * This function should only be called before any drawing operations have been
   * performed on the current page. The simplest way to do this is to call this
   * function immediately after creating the surface or immediately after
   * completing a page with either Context::show_page() or Context::copy_page().
   *
   * @param width_in_points new surface width, in points (1 point == 1/72.0 inch)
   * @param height_in_points new surface height, in points (1 point == 1/72.0 inch)
   */
  void set_size(double width_in_points, double height_in_points);

  /** Emit a comment into the PostScript output for the given surface.  See the
   * cairo reference documentation for more information.
   *
   * @param comment a comment string to be emitted into the PostScript output
   */
  void dsc_comment(std::string comment);

  /**
   * This function indicates that subsequent calls to dsc_comment() should direct
   * comments to the Setup section of the PostScript output.
   *
   * This function should be called at most once per surface, and must be called
   * before any call to dsc_begin_page_setup() and before any drawing is performed
   * to the surface.
   */
  void dsc_begin_setup();

  /** This function indicates that subsequent calls to dsc_comment() should
   * direct comments to the PageSetup section of the PostScript output.
   *
   * This function call is only needed for the first page of a surface. It
   * should be called after any call to dsc_begin_setup() and before any drawing
   * is performed to the surface.
   */
  void dsc_begin_page_setup();

  /**
   * If eps is true, the PostScript surface will output Encapsulated
   * PostScript.
   *
   * This function should only be called before any drawing operations
   * have been performed on the current page. The simplest way to do
   * this is to call this function immediately after creating the
   * surface. An Encapsulated Postscript file should never contain more
   * than one page.
   *
   * @since 1.6
   **/
  void set_eps(bool eps);

  /** Check whether the PostScript surface will output Encapsulated PostScript.
   *
   * @since 1.8
   */
  bool get_eps() const;

  /**
   * Restricts the generated PostSript file to @level. See get_levels() for a
   * list of available level values that can be used here.
   *
   * This function should only be called before any drawing operations have been
   * performed on the given surface. The simplest way to do this is to call this
   * function immediately after creating the surface.
   *
   * @param level PostScript level
   *
   * @since 1.6
   **/
  void restrict_to_level(PsLevel level);

  /**
   * Used to retrieve the list of supported levels. See
   * restrict_to_level().
   *
   * @since 1.6
   **/
  static const std::vector<PsLevel> get_levels();

  /**
   * Get the string representation of the given level id. This function will
   * return an empty string if level id isn't valid. See get_levels() for a way
   * to get the list of valid level ids.
   *
   * @return the string associated to given level.
   *
   * @param level a level id
   *
   * @since 1.6
   **/
  static std::string level_to_string(PsLevel level);
};

#endif // CAIRO_HAS_PS_SURFACE


#ifdef CAIRO_HAS_SVG_SURFACE

/** @example svg-surface.cc
 * An example of using Cairo::SvgSurface class to render to SVG
 */

typedef enum
{
  SVG_VERSION_1_1 = CAIRO_SVG_VERSION_1_1,
  SVG_VERSION_1_2 = CAIRO_SVG_VERSION_1_2
} SvgVersion;

/** A SvgSurface provides a way to render Scalable Vector Graphics (SVG) images
 * from cairo.  This surface is not rendered to the screen but instead renders
 * the drawing to an SVG file on disk.
 *
 * @note For this Surface to be available, cairo must have been compiled with
 * SVG support
 */
class SvgSurface : public Surface
{
public:

  /** Create a C++ wrapper for the C instance. This C++ instance should then be
   * given to a RefPtr.
   *
   * @param cobject The C instance.
   * @param has_reference whether we already have a reference. Otherwise, the
   * constructor will take an extra reference.
   */
  explicit SvgSurface(cairo_surface_t* cobject, bool has_reference = false);
  virtual ~SvgSurface();


  /** Creates a SvgSurface with a specified dimensions that will be saved as the
   * given filename
   *
   * @param filename    The name of the SVG file to save the surface to
   * @param width_in_points   The width of the SVG document in points
   * @param height_in_points   The height of the SVG document in points
   */
  static RefPtr<SvgSurface> create(std::string filename, double width_in_points, double height_in_points);

  /** Creates a SvgSurface with a specified dimensions that will be written to
   * the given write function instead of saved directly to disk
   *
   * @param write_func  The function to be called when the backend needs to
   * write data to an output stream
   * @param width_in_points   The width of the SVG document in points
   * @param height_in_points   The height of the SVG document in points
   *
   * @since 1.8
   */
  static RefPtr<SvgSurface> create_for_stream(const SlotWriteFunc& write_func, double width_in_points, double height_in_points);

  /** @deprecated Use SvgSurface::create_for_stream() instead */
  static RefPtr<SvgSurface> create(cairo_write_func_t write_func, void *closure, double width_in_points, double height_in_points);

  /**
   * Restricts the generated SVG file to the given version. See get_versions()
   * for a list of available version values that can be used here.
   *
   * This function should only be called before any drawing operations have been
   * performed on the given surface. The simplest way to do this is to call this
   * function immediately after creating the surface.
   *
   * @since 1.2
   */
  void restrict_to_version(SvgVersion version);

  /** Retrieves the list of SVG versions supported by cairo. See
   * restrict_to_version().
   *
   * @since 1.2
   */
  static const std::vector<SvgVersion> get_versions();

  /** Get the string representation of the given version id. The returned string
   * will be empty if version isn't valid. See get_versions() for a way to get
   * the list of valid version ids.
   *
   * since: 1.2
   */
  static std::string version_to_string(SvgVersion version);
};

#endif // CAIRO_HAS_SVG_SURFACE


/*******************************************************************************
 * THE FOLLOWING SURFACE TYPES ARE EXPERIMENTAL AND NOT FULLY SUPPORTED
 ******************************************************************************/

#ifdef CAIRO_HAS_GLITZ_SURFACE

/** A GlitzSurface provides a way to render to the X Window System using Glitz.
 * This provides a way to use OpenGL-accelerated graphics from cairo.  If you
 * want to use hardware-accelerated graphics within the X Window system, you
 * should use this Surface type.
 *
 * @note For this Surface to be available, cairo must have been compiled with
 * Glitz support
 *
 * @warning This is an experimental surface.  It is not yet marked as a fully
 * supported surface by the cairo library
 */
class GlitzSurface : public Surface
{

public:

  /** Create a C++ wrapper for the C instance. This C++ instance should then be
   * given to a RefPtr.
   *
   * @param cobject The C instance.
   * @param has_reference whether we already have a reference. Otherwise, the
   * constructor will take an extra reference.
   */
  explicit GlitzSurface(cairo_surface_t* cobject, bool has_reference = false);

  virtual ~GlitzSurface();

  /** Creates a new GlitzSurface
   *
   * @param surface  a glitz surface type
   */
  static RefPtr<GlitzSurface> create(glitz_surface_t *surface);

};

#endif // CAIRO_HAS_GLITZ_SURFACE

} // namespace Cairo

#endif //__CAIROMM_SURFACE_H

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