Intel® Integrated Performance Primitives (Intel® IPP) Developer Guide and Reference

ID 790148
Date 6/24/2024
Public

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Document Table of Contents

Div_Round

Divides pixel values of an image by pixel values of another image with different rounding modes.

Syntax

Case 1: Not-in-place operation on integer data

IppStatus ippiDiv_Round_<mod>(const Ipp<datatype>* pSrc1, int src1Step, const Ipp<datatype>* pSrc2, int src2Step, Ipp<datatype>* pDst, int dstStep, IppiSize roiSize, IppRoundMode rndMode, int scaleFactor);

Supported values for mod:

8u_C1RSfs

16u_C1RSfs

16s_C1RSfs

8u_C3RSfs

16u_C3RSfs

16s_C3RSfs

8u_AC4RSfs

16u_AC4RSfs

16s_AC4RSfs

8u_C4RSfs

16u_C4RSfs

16s_C4RSfs

Case 2: In-place operation on integer data

IppStatus ippiDiv_Round_<mod>(const Ipp<datatype>* pSrc, int srcStep, Ipp<datatype>* pSrcDst, int srcDstStep, IppiSize roiSize, IppRoundMode rndMode, int scaleFactor);

Supported values for mod:

8u_C1IRSfs

16u_C1IRSfs

16s_C1IRSfs

8u_C3IRSfs

16u_C3IRSfs

16s_C3IRSfs

8u_AC4IRSfs

16u_AC4IRSfs

16s_AC4IRSfs

8u_C4IRSfs

16u_C4IRSfs

16s_C4IRSfs

Include Files

ippi.h

Domain Dependencies

Headers: ippcore.h, ippvm.h, ipps.h

Libraries: ippcore.lib, ippvm.lib, ipps.lib

Parameters

pSrc, pSrc1, pSrc2

Pointers to the source images ROI.

srcStep, src1Step, src2Step

Distances in bytes between starts of consecutive lines in the source images.

pDst

Pointer to the destination image ROI.

dstStep

Distance in bytes between starts of consecutive lines in the destination image.

pSrcDst

Pointer to the source and destination image ROI for the in-place operation.

srcDstStep

Distance in bytes between starts of consecutive lines in the source and destination image for the in-place operation.

roiSize

Size of the source and destination ROI in pixels.

roundMode

Rounding mode, the following values are possible:

ippRndZero

specifies that floating-point values are truncated toward zero,

ippRndNear

specifies that floating-point values are rounded to the nearest even integer when the fractional part equals 0.5; otherwise they are rounded to the nearest integer,

ippRndFinancial

specifies that floating-point values are rounded down to the nearest integer when the fractional part is less than 0.5, or rounded up to the nearest integer if the fractional part is equal or greater than 0.5.

scaleFactor

Scale factor (see Integer Result Scaling).

Description

This function operates with ROI (see Regions of Interest in Intel IPP).

This function divides pixel values of the source buffer pSrc2 by the corresponding pixel values of the buffer pSrc1 and places the result in a destination buffer pDst. For in-place operations, the values in pSrcDst are divided by the values in pSrc and placed into pSrcDst. The resulting values are scaled by scaleFactor and rounded using the rounding method specified by the parameter roundMode. When the function encounters a zero divisor value, the execution is not interrupted. The function returns the warning message and corresponding result value (see appendix “Handling of Special Cases” for more information).

Note that the functions with the AC4 descriptor do not process alpha channelss.

Return Values

ippStsNoErr

Indicates no error. Any other value indicates an error or a warning.

ippStsNullPtrErr

Indicates an error condition if one of the specified pointers is NULL.

ippStsSizeErr

Indicates an error condition if roiSize has a field with zero or negative value.

ippStsStepErr

Indicates an error condition if any of the specified buffer step values is zero or negative.

ippStsDivByZero

Indicates a warning that a divisor value is zero. The function execution is continued.

ippStsStsRoundModeNotSupportedErr

Indicates an error condition if the roundMode has an illegal value.