ImageGear for C and C++ on Linux v20.0 - Updated
API Reference Guide > Core Component API Reference > Core Component Functions Reference > Image Processing Functions > IG_IP_NR_ROI_control_set

This function allows you to set the non-rectangular ROI attributes associated with any HIGEAR that has an associated non-rectangular ROI mask.


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        HIGEAR hIGear, 
        AT_MODE nAttributeID, 
        const LPVOID lpData


Name Type Description
hIGear HIGEAR HIGEAR handle of the image to which you wish make the non-rectangular ROI setting changes.
nAttributeID AT_MODE Set to an AT_MODE constant for the non-rectangular ROI attribute you would like to set.
lpData const LPVOID Set to the desired attribute setting.

Return Value:

Returns the number of ImageGear errors that occurred during this function call. If there are no errors, the return value is IGE_SUCCESS.

Supported Raster Image Formats:

This function does not process image pixels.


Copy Code
AT_ERRCOUNT      nErrcount;
BOOL    bCondition;
HIGEAR  hIGearMask;]
/* Find out whether the image rectangle for hIGear is set to be overridden by a non-
rectangular ROI   */
nErrcount = IG_IP_NR_ROI_control_set (hIGear, IG_CONTROL_NR_ROI_DIB, (LPVOID) hIGearMask);
/* Find out what the reference point for a mask HIGEAR is in the hIGear */
nErrcount = IG_IP_NR_ROI_control_set (hIGear, IG_CONTROL_NR_ROI_CONDITION, (LPVOID)


These attributes are only applicable for non-rectangular ROIs. Use IG_IP_NR_ROI_to_HIGEAR_mask() to create the mask image.

All ROI control settings have defined constants in accucnst.h which have a prefix of IG_CONTROL_NR_ROI_. The following is a list of each setting available at the time of this writing, and a description of what each does.

IG_CONTROL_NR_ROI_CONDITION can also be set using IG_IP_NR_ROI_mask_associate() function.
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