avir::CLancIR::CResizeScanline Class Reference

Scanline resizing positions class. More...

#include <lancir.h>

Public Member Functions
void	reset ()
	Object's reset function.
void	update (const int SrcLen0, const int DstLen0, const double o0, CResizeFilters &rf, float *const sp=nullptr)
	Scanline positions update function.
void	updateSPO (CResizeFilters &rf, float *const sp)
	Scanline pixel offsets update function.

Public Attributes
int	padl
	Left-padding (in pixels) required for source scanline.
int	padr
	Right-padding (in pixels) required for source scanline.
CResizePos *	pos
	Source scanline positions (offsets) and filters for each destination pixel position.

Protected Attributes
int	DstLen
	Current DstLen.
double	o
	Current o.
int	poslen
	Allocated pos buffer's length.
int	SrcLen
	Current SrcLen.

Detailed Description

Scanline resizing positions class.

Class contains resizing positions, and prepares source scanline positions for resize filtering. The public variables become available after the update() function call.

Member Function Documentation

reset()

void avir::CLancIR::CResizeScanline::reset

(

)

Object's reset function.

Function "resets" this object so that the next update() call fully updates the position buffer. Reset is necessary if the corresponding CResizeFilters object was updated.

update()

void avir::CLancIR::CResizeScanline::update	(	const int	SrcLen0,
		const int	DstLen0,
		const double	o0,
		CResizeFilters &	rf,
		float *const	sp = nullptr )

Scanline positions update function.

Function updates resizing positions, updates padl, padr, and pos buffer.

Parameters

SrcLen0	Source image scanline length, used to create a scanline buffer without length pre-calculation.
DstLen0	Destination image scanline length.
o0	Initial source image offset.
rf	Resizing filters object.
sp	A pointer to scanline buffer, to use for absolute scanline positioning, can be nullptr.

updateSPO()

void avir::CLancIR::CResizeScanline::updateSPO	(	CResizeFilters &	rf,
		float *const	sp )

Scanline pixel offsets update function.

Function updates pos buffer's spo (scanline pixel offset) values.

Parameters

rf	Resizing filters object.
sp	A pointer to scanline buffer, to use for absolute scanline positioning, can be nullptr.