#include <fltkimgbuf.hh>

Classes
class	GammaCorrectionTable

Public Member Functions
	FltkImgbuf (Type type, int width, int height, double gamma)

void	setCMap (int *colors, int num_colors)

void	scaleRow (int row, const core::byte *data)

void	scaleRowSimple (int row, const core::byte *data)

void	scaleRowBeautiful (int row, const core::byte *data)

void	newScan ()

void	copyRow (int row, const core::byte *data)

core::Imgbuf *	getScaledBuf (int width, int height)

void	getRowArea (int row, dw::core::Rectangle *area)

int	getRootWidth ()

int	getRootHeight ()

core::Imgbuf *	createSimilarBuf (int width, int height)

void	copyTo (Imgbuf *dest, int xDestRoot, int yDestRoot, int xSrc, int ySrc, int widthSrc, int heightSrc)

void	ref ()

void	unref ()

bool	lastReference ()

void	setDeleteOnUnref (bool deleteOnUnref)

bool	isReferred ()

void	draw (Fl_Widget *target, int xRoot, int yRoot, int x, int y, int width, int height)

Public Member Functions inherited from dw::core::Imgbuf
	Imgbuf ()

	~Imgbuf ()

virtual void	copyTo (Imgbuf *dest, int xDestRoot, int yDestRoot, int xSrc, int ySrc, int widthSrc, int heightSrc)=0

Public Member Functions inherited from lout::object::Object
virtual	~Object ()
	The destructor is defined as virtual (but not abstract), so that destruction of Object's works properly. More...

virtual bool	equals (Object *other)
	Returns, whether two objects are equal. More...

virtual int	hashValue ()
	Return a hash value for the object. More...

virtual Object *	clone ()
	Return an exact copy of the object. More...

virtual void	intoStringBuffer (misc::StringBuffer *sb)
	Store a textual representation of the object in a misc::StringBuffer. More...

const char *	toString ()
	Use object::Object::intoStringBuffer to return a textual representation of the object. More...

virtual size_t	sizeOf ()
	Return the number of bytes, this object totally uses. More...

Public Member Functions inherited from lout::signal::ObservedObject
virtual	~ObservedObject ()

void	connectDeletion (DeletionReceiver *receiver)

Static Public Member Functions
static void	freeall ()

static void	scaleBuffer (const core::byte src, int srcWidth, int srcHeight, core::byte dest, int destWidth, int destHeight, int bpp, double gamma)

Protected Member Functions
	~FltkImgbuf ()

Private Member Functions
	FltkImgbuf (Type type, int width, int height, double gamma, FltkImgbuf *root)

void	init (Type type, int width, int height, double gamma, FltkImgbuf *root)

int	scaledY (int ySrc)

int	backscaledY (int yScaled)

int	isRoot ()

void	detachScaledBuf (FltkImgbuf *scaledBuf)
	This method is called for the root buffer, when a scaled buffer removed. More...

Static Private Member Functions
static uchar *	findGammaCorrectionTable (double gamma)

static bool	excessiveImageDimensions (int width, int height)

Private Attributes
FltkImgbuf *	root

int	refCount

bool	deleteOnUnref

lout::container::typed::List < FltkImgbuf > *	scaledBuffers

int	width

int	height

Type	type

double	gamma

int	bpp

uchar *	rawdata

lout::misc::BitSet *	copiedRows

Static Private Attributes
static lout::container::typed::Vector < GammaCorrectionTable > *	gammaCorrectionTables = new Vector <FltkImgbuf::GammaCorrectionTable> (true, 2)

Additional Inherited Members
Public Types inherited from dw::core::Imgbuf
enum	Type { RGB, RGBA, GRAY, INDEXED, INDEXED_ALPHA }

Constructor & Destructor Documentation

dw::fltk::FltkImgbuf::FltkImgbuf	(	Type	type,
		int	width,
		int	height,
		double	gamma,
		FltkImgbuf *	root
	)

private

References DBG_OBJ_CREATE, and lout::misc::init().

dw::fltk::FltkImgbuf::~FltkImgbuf ( )

protected

References DBG_OBJ_DELETE.

dw::fltk::FltkImgbuf::FltkImgbuf	(	Type	type,
		int	width,
		int	height,
		double	gamma
	)

References DBG_OBJ_CREATE, and lout::misc::init().

Member Function Documentation

int dw::fltk::FltkImgbuf::backscaledY ( int yScaled )

private

void dw::fltk::FltkImgbuf::copyRow	(	int	row,
		const core::byte *	data
	)

virtual

Implements dw::core::Imgbuf.

References DBG_IF_RTFL, DBG_OBJ_SET_SYM, lout::misc::StringBuffer::getChars(), lout::container::typed::Iterator< T >::hasNext(), and scaleRow().

void dw::fltk::FltkImgbuf::copyTo	(	Imgbuf *	dest,
		int	xDestRoot,
		int	yDestRoot,
		int	xSrc,
		int	ySrc,
		int	widthSrc,
		int	heightSrc
	)

References bpp, height, lout::misc::min(), rawdata, and width.

core::Imgbuf * dw::fltk::FltkImgbuf::createSimilarBuf	(	int	width,
		int	height
	)

virtual

Creates an image buffer with same parameters (type, gamma etc.) except size.

Implements dw::core::Imgbuf.

void dw::fltk::FltkImgbuf::detachScaledBuf ( FltkImgbuf * scaledBuf )

private

This method is called for the root buffer, when a scaled buffer removed.

void dw::fltk::FltkImgbuf::draw	(	Fl_Widget *	target,
		int	xRoot,
		int	yRoot,
		int	x,
		int	y,
		int	width,
		int	height
	)

bool dw::fltk::FltkImgbuf::excessiveImageDimensions	(	int	width,
		int	height
	)

staticprivate

References IMAGE_MAX_AREA.

uchar * dw::fltk::FltkImgbuf::findGammaCorrectionTable ( double gamma )

staticprivate

References dw::fltk::FltkImgbuf::GammaCorrectionTable::gamma, and dw::fltk::FltkImgbuf::GammaCorrectionTable::map.

void dw::fltk::FltkImgbuf::freeall ( )

static

Referenced by dw::fltk::freeall().

int dw::fltk::FltkImgbuf::getRootHeight ( )

virtual

Implements dw::core::Imgbuf.

int dw::fltk::FltkImgbuf::getRootWidth ( )

virtual

Implements dw::core::Imgbuf.

void dw::fltk::FltkImgbuf::getRowArea	(	int	row,
		dw::core::Rectangle *	area
	)

virtual

Implements dw::core::Imgbuf.

References dw::core::Rectangle::height, dw::core::Rectangle::width, dw::core::Rectangle::x, and dw::core::Rectangle::y.

core::Imgbuf * dw::fltk::FltkImgbuf::getScaledBuf	(	int	width,
		int	height
	)

virtual

Implements dw::core::Imgbuf.

References DBG_OBJ_ASSOC_CHILD, dw::core::Imgbuf::getScaledBuf(), lout::container::typed::Iterator< T >::hasNext(), height, MAX_HEIGHT, MAX_WIDTH, ref(), and width.

void dw::fltk::FltkImgbuf::init	(	Type	type,
		int	width,
		int	height,
		double	gamma,
		FltkImgbuf *	root
	)

private

References bpp, copiedRows, DBG_IF_RTFL, DBG_OBJ_SET_NUM, DBG_OBJ_SET_SYM, lout::misc::BitSet::get(), lout::misc::StringBuffer::getChars(), height, lout::misc::init(), MAX_HEIGHT, MAX_WIDTH, rawdata, and width.

bool dw::fltk::FltkImgbuf::isReferred ( )

virtual

Todo:: Comment

Implements dw::core::Imgbuf.

int dw::fltk::FltkImgbuf::isRoot ( )

inlineprivate

bool dw::fltk::FltkImgbuf::lastReference ( )

virtual

Todo:: Comment

Implements dw::core::Imgbuf.

void dw::fltk::FltkImgbuf::newScan ( )

virtual

Implements dw::core::Imgbuf.

References lout::misc::BitSet::clear(), copiedRows, DBG_IF_RTFL, DBG_OBJ_SET_SYM, lout::misc::StringBuffer::getChars(), lout::container::typed::Iterator< T >::hasNext(), and lout::object::Object::intoStringBuffer().

void dw::fltk::FltkImgbuf::ref ( )

virtual

Implements dw::core::Imgbuf.

Referenced by getScaledBuf().

void dw::fltk::FltkImgbuf::scaleBuffer	(	const core::byte *	src,
		int	srcWidth,
		int	srcHeight,
		core::byte *	dest,
		int	destWidth,
		int	destHeight,
		int	bpp,
		double	gamma
	)

inlinestatic

General method to scale an image buffer. Used to scale single lines in scaleRowBeautiful.

The algorithm is rather simple. If the scaled buffer is smaller (both width and height) than the original buffer, each pixel in the scaled buffer is assigned a rectangle of pixels in the original buffer; the resulting pixel value (red, green, blue) is simply the average of all pixel values. This is pretty fast and leads to rather good results.

Nothing special (like interpolation) is done when scaling up.

If scaleMode is set to BEAUTIFUL_GAMMA, gamma correction is considered, see http://www.4p8.com/eric.brasseur/gamma.html.

TODO Could be optimized as in scaleRowSimple: when the destination image is larger, calculate only one row/column, and copy it to the other rows/columns.

References dw::fltk::BEAUTIFUL_GAMMA, lout::misc::max(), and dw::fltk::scaleMode.

int dw::fltk::FltkImgbuf::scaledY ( int ySrc )

private