An XlibSurface provides a way to render to the X Window System using XLib. More...

#include <cairomm/xlib_surface.h>

Inheritance diagram for Cairo::XlibSurface:

Public Member Functions
	XlibSurface (cairo_surface_t *cobject, bool has_reference=false)
	Create a C++ wrapper for the C instance.
	~XlibSurface () override
void	set_size (int width, int height)
	Informs cairo of the new size of the X Drawable underlying the surface.
void	set_drawable (Drawable drawable, int width, int height)
	Informs cairo of a new X Drawable underlying the surface.
Drawable	get_drawable () const
	gets the Drawable object associated with this surface
const Display *	get_display () const
	Get the X Display for the underlying X Drawable.
Display *	get_display ()
	Get the X Display for the underlying X Drawable.
Screen *	get_screen ()
	Get the X Screen for the underlying X Drawable.
const Screen *	get_screen () const
	Get the X Screen for the underlying X Drawable.
Visual *	get_visual ()
	Get the X Visual for the underlying X Drawable.
const Visual *	get_visual () const
	Get the X Visual for the underlying X Drawable.
int	get_depth () const
	Get the number of bits used to represent each pixel value.
int	get_height () const
	Get the height in pixels of the X Drawable underlying the surface.
int	get_width () const
	Get the width in pixels of the X Drawable underlying the surface.
XRenderPictFormat *	get_xrender_format () const
	Gets the X Render picture format that @surface uses for rendering with the X Render extension.
Public Member Functions inherited from Cairo::Surface
	Surface (cairo_surface_t *cobject, bool has_reference=false)
	Create a C++ wrapper for the C instance.
	Surface (const Surface &)=delete
Surface &	operator= (const Surface &)=delete
virtual	~Surface ()
const unsigned char *	get_mime_data (const std::string & mime_type, unsigned long & length)
	Return mime data previously attached to surface using the specified mime type.
void	set_mime_data (const std::string & mime_type, unsigned char * data, unsigned long length, const SlotDestroy & slot_destroy)
	Attach an image in the format mime_type to surface.
void	unset_mime_data (const std::string & mime_type)
	Remove the data from a surface.
void	get_font_options (FontOptions & options) const
	Retrieves the default font rendering options for the surface.
void	finish ()
	This function finishes the surface and drops all references to external resources.
void	flush ()
	Do any pending drawing for the surface and also restore any temporary modifications cairo has made to the surface's state.
void	mark_dirty ()
	Tells cairo to consider the data buffer dirty.
void	mark_dirty (int x, int y, int width, int height)
	Marks a rectangular area of the given surface dirty.
void	set_device_offset (double x_offset, double y_offset)
	Sets an offset that is added to the device coordinates determined by the CTM when drawing to surface.
void	get_device_offset (double & x_offset, double & y_offset) const
	Returns a previous device offset set by set_device_offset().
void	set_fallback_resolution (double x_pixels_per_inch, double y_pixels_per_inch)
	Set the horizontal and vertical resolution for image fallbacks.
void	get_fallback_resolution (double & x_pixels_per_inch, double & y_pixels_per_inch) const
	This function returns the previous fallback resolution set by set_fallback_resolution(), or default fallback resolution if never set.
SurfaceType	get_type () const
Content	get_content () const
	This function returns the content type of surface which indicates whether the surface contains color and/or alpha information.
void	copy_page ()
	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.
void	show_page ()
	Emits and clears the current page for backends that support multiple pages.
bool	has_show_text_glyphs () const
	Returns whether the surface supports sophisticated Context::show_text_glyphs() operations.
void	write_to_png (const std::string & filename)
	Writes the contents of surface to a new file filename as a PNG image.
void	write_to_png_stream (const SlotWriteFunc & write_func)
	Writes the Surface to the write function.
void	write_to_png (cairo_write_func_t write_func, void * closure)
RefPtr< Device >	get_device ()
	This function returns the device for a surface.
cobject *	cobj ()
	Provides acces to the underlying C cairo surface.
const cobject *	cobj () const
	Provides acces to the underlying C cairo surface.

Static Public Member Functions
static RefPtr< XlibSurface >	create (Display * dpy, Drawable drawable, Visual * visual, int width, int height)
	Creates an Xlib surface that draws to the given drawable.
static RefPtr< XlibSurface >	create (Display * dpy, Pixmap bitmap, Screen * screen, int width, int height)
	Creates an Xlib surface that draws to the given bitmap.
static Cairo::RefPtr< Cairo::XlibSurface >	create_with_xrender_format (Display * dpy, Drawable drawable, Screen * screen, XRenderPictFormat * format, int width, int height)
	Creates an Xlib surface that draws to the given drawable.
Static Public Member Functions inherited from Cairo::Surface
static RefPtr< Surface >	create (const RefPtr< Surface > other, Content content, int width, int height)
	Create a new surface that is as compatible as possible with an existing surface.
static RefPtr< Surface >	create (const RefPtr< Surface > & target, double x, double y, double width, double height)
	Create a new surface that is a rectangle within the target surface.

Additional Inherited Members
Public Types inherited from Cairo::Surface
typedef sigc::slot< ErrorStatus, const unsigned char *, unsigned int >	SlotWriteFunc
	For example: `ErrorStatus my_write_func(unsigned char* data, unsigned int length);`.
typedef sigc::slot< ErrorStatus, unsigned char *, unsigned int >	SlotReadFunc
	This is the type of function which is called when a backend needs to read data from an input stream.
typedef sigc::slot< void >	SlotDestroy
	For instance, void on_destroy();.
typedef cairo_surface_t	cobject
	The underlying C cairo surface type.
Protected Attributes inherited from Cairo::Surface
cobject *	m_cobject
	The underlying C cairo surface type that is wrapped by this Surface.

Detailed Description

An XlibSurface provides a way to render to the X Window System using XLib.

If you want to draw to the screen within an application that uses the X Window system, you should use this Surface type.

Note: For this surface to be availabe, cairo must have been compiled with support for XLib Surfaces

Constructor & Destructor Documentation

◆ XlibSurface()

Cairo::XlibSurface::XlibSurface	(	cairo_surface_t *	cobject,
		bool	has_reference = false )

explicit

Create a C++ wrapper for the C instance.

This C++ instance should then be given to a RefPtr.

Parameters

cobject	The C instance.
has_reference	whether we already have a reference. Otherwise, the constructor will take an extra reference.

◆ ~XlibSurface()

Cairo::XlibSurface::~XlibSurface ( )

override

Member Function Documentation

◆ create() [1/2]

RefPtr< XlibSurface > Cairo::XlibSurface::create	(	Display *	dpy,
		Drawable	drawable,
		Visual *	visual,
		int	width,
		int	height )

static

Creates an Xlib surface that draws to the given drawable.

The way that colors are represented in the drawable is specified by the provided visual.

Note: If drawable is a Window, then the function cairo_xlib_surface_set_size must be called whenever the size of the window changes.

Parameters

dpy	an X Display
drawable	an X Drawable, (a Pixmap or a Window)
visual	the visual to use for drawing to drawable. The depth of the visual must match the depth of the drawable. Currently, only TrueColor visuals are fully supported.
width	the current width of drawable.
height	the current height of drawable.

Returns: A RefPtr to the newly created surface

◆ create() [2/2]

RefPtr< XlibSurface > Cairo::XlibSurface::create	(	Display *	dpy,
		Pixmap	bitmap,
		Screen *	screen,
		int	width,
		int	height )

static

Creates an Xlib surface that draws to the given bitmap.

This will be drawn to as a CAIRO_FORMAT_A1 object.

Parameters

dpy	an X Display
bitmap	an X Drawable, (a depth-1 Pixmap)
screen	the X Screen associated with bitmap
width	the current width of bitmap.
height	the current height of bitmap.

Returns: A RefPtr to the newly created surface

◆ create_with_xrender_format()

Cairo::RefPtr< Cairo::XlibSurface > Cairo::XlibSurface::create_with_xrender_format	(	Display *	dpy,
		Drawable	drawable,
		Screen *	screen,
		XRenderPictFormat *	format,
		int	width,
		int	height )

static

Creates an Xlib surface that draws to the given drawable.

The way that colors are represented in the drawable is specified by the provided picture format.

Note: If @drawable is a Window, then the function set_size() must be called whenever the size of the window changes.

Parameters

dpy	an X Display
drawable	an X Drawable, (a Pixmap or a Window)
screen	the X Screen associated with @drawable
format	the picture format to use for drawing to @drawable. The depth of @format must match the depth of the drawable.
width	the current width of @drawable.
height	the current height of @drawable.

Returns: the newly created surface

◆ get_depth()

int Cairo::XlibSurface::get_depth ( ) const

Get the number of bits used to represent each pixel value.

◆ get_display() [1/2]

Display * Cairo::XlibSurface::get_display ( )

Get the X Display for the underlying X Drawable.

◆ get_display() [2/2]

const Display * Cairo::XlibSurface::get_display ( ) const

Get the X Display for the underlying X Drawable.

◆ get_drawable()

Drawable Cairo::XlibSurface::get_drawable ( ) const

gets the Drawable object associated with this surface

◆ get_height()

int Cairo::XlibSurface::get_height ( ) const

Get the height in pixels of the X Drawable underlying the surface.

◆ get_screen() [1/2]

Screen * Cairo::XlibSurface::get_screen ( )

Get the X Screen for the underlying X Drawable.

◆ get_screen() [2/2]

const Screen * Cairo::XlibSurface::get_screen ( ) const

Get the X Screen for the underlying X Drawable.

◆ get_visual() [1/2]

Visual * Cairo::XlibSurface::get_visual ( )

Get the X Visual for the underlying X Drawable.

◆ get_visual() [2/2]

const Visual * Cairo::XlibSurface::get_visual ( ) const

Get the X Visual for the underlying X Drawable.

◆ get_width()

int Cairo::XlibSurface::get_width ( ) const

Get the width in pixels of the X Drawable underlying the surface.

◆ get_xrender_format()

XRenderPictFormat * Cairo::XlibSurface::get_xrender_format ( ) const

Gets the X Render picture format that @surface uses for rendering with the X Render extension.

If the surface was created by cairo_xlib_surface_create_with_xrender_format() originally, the return value is the format passed to that constructor.

Return value: the XRenderPictFormat* associated with @surface, or NULL if the surface is not an xlib surface or if the X Render extension is not available.

Since: 1.6

◆ set_drawable()

void Cairo::XlibSurface::set_drawable	(	Drawable	drawable,
		int	width,
		int	height )

Informs cairo of a new X Drawable underlying the surface.

The drawable must match the display, screen and format of the existing drawable or the application will get X protocol errors and will probably terminate. No checks are done by this function to ensure this compatibility.

Parameters

drawable	the new drawable for the surface
width	the width of the new drawable
height	the height of the new drawable

◆ set_size()

void Cairo::XlibSurface::set_size	(	int	width,
		int	height )

Informs cairo of the new size of the X Drawable underlying the surface.

For a surface created for a Window (rather than a Pixmap), this function must be called each time the size of the window changes. (For a subwindow, you are normally resizing the window yourself, but for a toplevel window, it is necessary to listen for ConfigureNotify events.)

A Pixmap can never change size, so it is never necessary to call this function on a surface created for a Pixmap.

Parameters

width	the new width of the surface
height	the new height of the surface

The documentation for this class was generated from the following file:

cairomm/xlib_surface.h

Public Member Functions

Static Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ XlibSurface()

◆ ~XlibSurface()

Member Function Documentation

◆ create() [1/2]

◆ create() [2/2]

◆ create_with_xrender_format()

◆ get_depth()

◆ get_display() [1/2]

◆ get_display() [2/2]

◆ get_drawable()

◆ get_height()

◆ get_screen() [1/2]

◆ get_screen() [2/2]

◆ get_visual() [1/2]

◆ get_visual() [2/2]

◆ get_width()

◆ get_xrender_format()

◆ set_drawable()

◆ set_size()