FX::FXBitmap Class Reference

A Bitmap is a rectangular array of pixels. More...

#include <FXBitmap.h>

Inheritance diagram for FX::FXBitmap:

Public Member Functions
	FXBitmap (FXApp *a, const FXuchar *pix=nullptr, FXuint opts=0, FXint w=1, FXint h=1)
	Create a bitmap. More...
void	setOptions (FXuint opts)
	Change options.
FXuint	getOptions () const
	To get to the option flags.
void	setOwned (FXbool owned)
	Set pixel data ownership flag.
FXbool	isOwned () const
	Get pixel data ownership flag.
virtual void	setData (FXuchar *pix, FXuint opts=0)
	Populate the bitmap with new pixel data of the same size; it will assume ownership of the pixel data if image BITMAP_OWNED option is passed. More...
virtual void	setData (FXuchar *pix, FXuint opts, FXint w, FXint h)
	Populate the bitmap with new pixel data of a new size; it will assume ownership of the pixel data if image BITMAP_OWNED option is passed. More...
FXuchar *	getData () const
	To get to the pixel data.
FXbool	getPixel (FXint x, FXint y) const
	Get pixel at x,y.
void	setPixel (FXint x, FXint y, FXbool color)
	Change pixel at x,y.
virtual void	create ()
	Create the server side pixmap, then call render() to fill it with the pixel data from the client-side buffer. More...
virtual void	detach ()
	Detach the server side pixmap from the Bitmap. More...
virtual void	destroy ()
	Destroy the server-side pixmap. More...
virtual void	restore ()
	Retrieves pixels from the server-side bitmap.
virtual void	render ()
	Render the server-side representation of the bitmap from client-side pixels.
virtual void	release ()
	Release the client-side pixels buffer, free it if it was owned. More...
virtual void	resize (FXint w, FXint h)
	Resize both client-side and server-side representations (if any) to the given width and height. More...
virtual void	scale (FXint w, FXint h)
	Rescale pixels image to the specified width and height; this calls resize() to adjust the client and server side representations.
virtual void	mirror (FXbool horizontal, FXbool vertical)
	Mirror bitmap horizontally and/or vertically.
virtual void	rotate (FXint degrees)
	Rotate bitmap by degrees ccw.
virtual void	crop (FXint x, FXint y, FXint w, FXint h, FXbool color=false)
	Crop bitmap to given rectangle; this calls resize() to adjust the client and server side representations. More...
virtual void	fill (FXbool color)
	Fill bitmap with uniform value.
virtual void	save (FXStream &store) const
	Save object to stream.
virtual void	load (FXStream &store)
	Load object from stream.
virtual FXbool	savePixels (FXStream &store) const
	Save pixel data only.
virtual FXbool	loadPixels (FXStream &store)
	Load pixel data only.
virtual	~FXBitmap ()
	Cleanup.
Public Member Functions inherited from FX::FXDrawable
FXVisual *	getVisual () const
	Get the visual.
FXint	getWidth () const
	Width of drawable.
FXint	getHeight () const
	Height of drawable.
void	setVisual (FXVisual *vis)
	Change visual.
virtual	~FXDrawable ()
	Cleanup.
Public Member Functions inherited from FX::FXId
FXApp *	getApp () const
	Get application.
FXID	id () const
	Get XID handle.
void	setUserData (FXptr ptr)
	Set user data pointer.
FXptr	getUserData () const
	Get user data pointer.
virtual	~FXId ()
	Destructor.
Public Member Functions inherited from FX::FXObject
const FXchar *	getClassName () const
	Get class name of some object.
FXbool	isMemberOf (const FXMetaClass *metaclass) const
	Check if object is member of metaclass.
virtual long	tryHandle (FXObject *sender, FXSelector sel, void *ptr)
	Try handle message safely, catching certain exceptions.
virtual long	onDefault (FXObject *, FXSelector, void *)
	Called for unhandled messages.
virtual	~FXObject ()
	Virtual destructor.

Protected Attributes
FXuchar *	data
FXint	bytewidth
FXuint	options
Protected Attributes inherited from FX::FXDrawable
FXVisual *	visual
FXint	width
FXint	height
Protected Attributes inherited from FX::FXId
FXID	xid

Friends
class	FXDC
class	FXDCWindow

Additional Inherited Members
Protected Member Functions inherited from FX::FXDrawable
	FXDrawable (FXApp *a, FXint w, FXint h)
Protected Member Functions inherited from FX::FXId
	FXId (FXApp *a)

Detailed Description

A Bitmap is a rectangular array of pixels.

It supports two representations of these pixels: a client-side pixel buffer, and a server-side pixmap which is stored in an organization directly compatible with the screen, for fast drawing onto the device. The server-side representation is not directly accessible from the current process as it lives in the process of the X Server or GDI. The client-side pixel array is of size height x (width+7)/8 bytes, in other words 8 pixels packed into a single byte, starting at bit 0 on the left.

Constructor & Destructor Documentation

FXBitmap()

FX::FXBitmap::FXBitmap	(	FXApp *	a,
		const FXuchar *	pix = nullptr,
		FXuint	opts = 0,
		FXint	w = 1,
		FXint	h = 1
	)

Create a bitmap.

If a client-side pixel buffer has been specified, the bitmap does not own the pixel buffer unless the BITMAP_OWNED flag is set. If the BITMAP_OWNED flag is set but a NULL pixel buffer is passed, a pixel buffer will be automatically created and will be owned by the bitmap. The flags BITMAP_SHMI and BITMAP_SHMP may be specified for large bitmaps to instruct render() to use shared memory to communicate with the server.

Member Function Documentation

create()

virtual void FX::FXBitmap::create ( )

virtual

Create the server side pixmap, then call render() to fill it with the pixel data from the client-side buffer.

After the server-side image has been created, the client-side pixel buffer will be deleted unless BITMAP_KEEP has been specified. If the pixel buffer is not owned, i.e. the flag BITMAP_OWNED is not set, the pixel buffer will not be deleted.

Reimplemented from FX::FXId.

crop()

virtual void FX::FXBitmap::crop ( FXint  x, FXint  y, FXint  w, FXint  h, FXbool  color = false  )

virtual

Crop bitmap to given rectangle; this calls resize() to adjust the client and server side representations.

The new bitmap may be smaller or larger than the old one; blank areas are filled with color. There must be at least one pixel of overlap between the old and the new bitmap.

destroy()

virtual void FX::FXBitmap::destroy ( )

virtual

Destroy the server-side pixmap.

The client-side pixel buffer is not affected.

Reimplemented from FX::FXId.

detach()

virtual void FX::FXBitmap::detach ( )

virtual

Detach the server side pixmap from the Bitmap.

Afterwards, the Bitmap is left as if it never had a server-side resources.

Reimplemented from FX::FXId.

release()

virtual void FX::FXBitmap::release ( )

virtual

Release the client-side pixels buffer, free it if it was owned.

If it is not owned, the image just forgets about the buffer.

resize()

virtual void FX::FXBitmap::resize ( FXint  w, FXint  h  )

virtual

Resize both client-side and server-side representations (if any) to the given width and height.

The new representations typically contain garbage after this operation and need to be re-filled.

Reimplemented from FX::FXDrawable.

setData() [1/2]

virtual void FX::FXBitmap::setData ( FXuchar *  pix, FXuint  opts = 0  )

virtual

Populate the bitmap with new pixel data of the same size; it will assume ownership of the pixel data if image BITMAP_OWNED option is passed.

The server-side representation of the image, if it exists, is not updated. This can be done by calling render().

setData() [2/2]

virtual void FX::FXBitmap::setData ( FXuchar *  pix, FXuint  opts, FXint  w, FXint  h  )

virtual

Populate the bitmap with new pixel data of a new size; it will assume ownership of the pixel data if image BITMAP_OWNED option is passed.

The size of the server- side representation of the image, if it exists, is adjusted but the contents are not updated yet. This can be done by calling render().

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

• /home/jeroen/FOX/fox/fox-1.7.85/include/FXBitmap.h