Rotate 90 degrees

Rotate 90 degrees

Aris Basic's picture
Aris Basic
Fri, 05/04/2012 - 10:10

im trying to use RotateCenter to rotate an image in increments of 90 degressbut for some reason im not getting correct image back[cpp] IppiRect srcRect = { 0, 0, 0, 0}; srcRect.width = Width(); srcRect.height = Height(); IppiRect dstRect = { 0, 0, 0 , 0}; dstRect.width = Width(); dstRect.height = Height(); if (abs(angle) == 90 || abs(angle) == 270) std::swap(dstRect.width,dstRect.height); double xCenterSrc = Width()/2.0; double yCenterSrc = Height()/2.0; image.Alloc(dstRect.width,dstRect.height,NChannels(),Precision(),0); image.Color(Color()); image.Format(Format()); if (Precision() any idea what am i doing wrong ?

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Pitcha Y.'s picture
Pitcha Y.
Wed, 02/06/2013 - 06:01

Hi,

This code is working me. Rotate my bitmap by 90 degrees:

Ipp8u* dstBMP;
dstBMP = ippiMalloc_8u_C3(sizeImPlane.width, sizeImPlane.height, &pStepBMP);
int dw = _WIDTH ;
int dh = _HEIGHT ;
int src_step = _WIDTH * 3;
int dst_step = dw * 3;
IppiSize src_size = { _WIDTH, _HEIGHT };
IppiRect src_roi = { 0, 0, _WIDTH, _HEIGHT };
IppiRect dst_rect = { 0, 0, dw, dh };
double xShift = ((double)dw - (double)_WIDTH) / 2.0;
double yShift = ((double)dh - (double)_HEIGHT) / 2.0;
ippiAddRotateShift((double)_WIDTH / 2, (double)_HEIGHT / 2, 90, &xShift, &yShift);
ippiRotate_8u_C3R(srcBMP, src_size, src_step, src_roi, dstBMP, dst_step, dst_rect, 90, xShift, yShift, IPPI_INTER_NN);

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