MatrixWalkers Namespace Reference

Contains various iterators for matrices (see Matrix) to be used in walkOperate() and walkOperateCheckRotate(). More...

Classes
struct	RotBase
	Base structure for walkers. More...
struct	Rotation_0
	No rotation: x->, y->. More...
struct	Rotation_1_T
	Rotated 90deg\. More...
struct	Rotation_2
	Rotated 180deg\. More...
struct	Rotation_3_T
	Rotated 270deg\. More...
struct	Rotation_0_T
	No rotation, transposed: y->, x->. More...
struct	Rotation_1
	Rotated 90deg\. More...
struct	Rotation_2_T
	Rotated 180deg\. More...
struct	Rotation_3
	Rotated 270deg\. More...
struct	Rotation
	Performs manipulations with rotation codes 0-7 (dihedral group of order eight). More...
struct	Checked
	Checked_ iterator for a rectangle in a matrix, no rotation. More...
struct	CheckedImage
	Checked_ iterator for a whole QImage; no rotation, but always transposed. More...
struct	OperatorBase
	A convenience base type for operators to use with walkOperate(). More...
struct	RDSummer
	An operator computing the sum of products. More...
struct	AddMulCopy
	An operator performing a= (b+toAdd)*toMul. More...
struct	MulAddCopyChecked
	An operator performing a= b*toMul+toAdd and moving the result into [min,max] bounds. More...
struct	SumWalker
	Walker that iterates over rectangles in a matrix and returns their sums, to be constructed by makeSumWalker. More...
struct	HalfShrinkerMul
	Similar to HalfShrinker, but instead of multiplying the sums with 0.25 it uses an arbitrary number. More...
struct	AddMulCopyTo2nd
	Transformer performing an affine function. More...
struct	Assigner
	A simple assigning operator - assigns its second argument into the first one. More...
struct	SignChanger
	Transformer performing sign change. More...
struct	ReverseAssigner
	A simple assigning operator - assigns its second argument into the first one. More...
struct	HalfShrinker
	Matrix iterator performing a 2x2 to 1 shrink. More...
struct	HorizShrinker
	Matrix iterator performing a 3x3 to 1x2 shrink. More...
struct	VertShrinker
	Matrix iterator performing a 3x3 to 2x1 shrink. More...
struct	DiamShrinker
	Matrix iterator performing a shrink of a diamond (rotated sub-square) into a square, decreasing the area of used pixels to 50%. More...
Functions
template<class Checked , class Unchecked , class Operator >
Operator	walkOperate (Checked checked, Unchecked unchecked, Operator oper)
	Iterates two matrix iterators and performs an action.
template<class Check , class U , class Operator >
Operator	walkOperateCheckRotate (Check checked, Operator oper, MatrixSlice< U > pixels2, const Block &block2, char rotation)
	A flavour of walkOperate() choosing the right Rotation_* iterator based on rotation and constructing it from pixels2 and block2.
template<class T , class I >
Checked< T, I >	makeLinearizer (T *start, I inCount, I outCount)
	Creates a Checked structure to walk a linear array as a matrix.
template<class SumT , class PixT , class I >
SumWalker< SumT, PixT, I >	makeSumWalker (const SummedMatrix< SumT, PixT, I > &matrix, I x0, I y0, I inLevel, I outLevel)
	Constructs a square SumWalker on matrix starting on [x0,y0], iterating over squares of level (inLevel-outLevel) and covering a square of level outLevel.

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Detailed Description

Contains various iterators for matrices (see Matrix) to be used in walkOperate() and walkOperateCheckRotate().

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Function Documentation

template<class Checked , class Unchecked , class Operator >

Operator MatrixWalkers::walkOperate	(	Checked	checked,
		Unchecked	unchecked,
		Operator	oper
	)			[inline]

Iterates two matrix iterators and performs an action.

The loop is controled by the first iterator (checked) and on every corresponding pair (a,b) oper(a,b) is invoked. Returns oper.

Definition at line 252 of file matrixUtil.h.

References MatrixWalkers::RotBase< T, I >::get(), MatrixWalkers::Checked< T, I >::innerCond(), MatrixWalkers::RotBase< T, I >::innerInit(), MatrixWalkers::Rotation_0< T, I >::innerStep(), MatrixWalkers::Checked< T, I >::outerCond(), MatrixWalkers::Checked< T, I >::outerStep(), and walkOperate().

Referenced by MStdDomains::shrinkHorizontally(), MStdDomains::shrinkToDiamond(), MStdDomains::shrinkToHalf(), MStdDomains::shrinkVertically(), walkOperate(), and walkOperateCheckRotate().

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