CImage 회전, 반전 (Rotation, Flip)

CImage Rotation, Flip

/*

[input]

Image: source image,

szNew: size of new image,

nRotate: 0=no rotate, 1=rotate 90 left, 2=rotate 90 right, 3=rotate 180 upside down

nFlip: 0=no flip, 1=horizontal, 2=vertical

bNegative: true=film like negative image

[return]

pointer to new cimage

*/

CImage* EditImage(CImage& Image, CSize szNew, int nRotate, int nFlip, bool bNegative)

{

float fX, fY;

if (nRotate == 1 || nRotate == 2){

fX = szNew.cy / (float)Image.GetWidth();

fY = szNew.cx / (float)Image.GetHeight();

}

else{

fX = szNew.cx / (float)Image.GetWidth();

fY = szNew.cy / (float)Image.GetHeight();

}

//create new cimage

CImage* pImage = new CImage;

pImage->Create(szNew.cx, szNew.cy, 24);

for (int y = 0; y < szNew.cy; y++){

int y0 = y;

if (nFlip == 2)

y0 = szNew.cy - y - 1;

int y1 = y0;

for (int x = 0; x < szNew.cx; x++){

int x0 = x;

if (nFlip == 1)

x0 = szNew.cx - x - 1;

int x1 = x0;

if (nRotate == 1){

x1 = szNew.cy - y0 - 1;

y1 = x0;

}

else if (nRotate == 2){

x1 = y0;

y1 = szNew.cx - x0 - 1;

}

else if (nRotate == 3){

x1 = szNew.cx - x - 1;

y1 = szNew.cy - y - 1;

if (nFlip == 1)

x1 = x;

else if (nFlip == 2)

y1 = y;

}

//get the source image's pixel value

int xs = x1 / fX;

int ys = y1 / fY;

byte *ps = (byte*)Image.GetPixelAddress(xs, ys);

//nearest neighbour, or biliner for better result

byte *p = (byte*)pImage->GetPixelAddress(x, y);

if (bNegative){

*p = 255 - *ps;

*(p + 1) = 255 - *(ps + 1);

*(p + 2) = 255 - *(ps + 2);

}

else{

*p = *ps;

*(p + 1) = *(ps + 1);

*(p + 2) = *(ps + 2);

}

}

}

return pImage;

}