Fix photo Orientation

Fix photo Orientation
+ (UIImage *) Fixorientation: (UIImage *) Aimage {

No-op If the orientation is already correct
if (aimage.imageorientation = = Uiimageorientationup)
return aimage;

We need to calculate the proper transformation to make the image upright.
We do it on 2 steps:rotate if Left/right/down, and then flip if mirrored.
Cgaffinetransform transform = cgaffinetransformidentity;

Switch (aimage.imageorientation) {
Case Uiimageorientationdown:
Case uiimageorientationdownmirrored:
Transform = Cgaffinetransformtranslate (transform, AImage.size.width, aImage.size.height);
Transform = Cgaffinetransformrotate (transform, M_PI);
Break

Case Uiimageorientationleft:
Case uiimageorientationleftmirrored:
Transform = Cgaffinetransformtranslate (transform, aImage.size.width, 0);
Transform = Cgaffinetransformrotate (transform, m_pi_2);
Break

Case Uiimageorientationright:
Case uiimageorientationrightmirrored:
Transform = cgaffinetransformtranslate (transform, 0, aImage.size.height);
Transform = Cgaffinetransformrotate (transform,-m_pi_2);
Break
Default
Break
}

Switch (aimage.imageorientation) {
Case uiimageorientationupmirrored:
Case uiimageorientationdownmirrored:
Transform = Cgaffinetransformtranslate (transform, aImage.size.width, 0);
Transform = Cgaffinetransformscale (transform,-1, 1);
Break

Case uiimageorientationleftmirrored:
Case uiimageorientationrightmirrored:
Transform = Cgaffinetransformtranslate (transform, aImage.size.height, 0);
Transform = Cgaffinetransformscale (transform,-1, 1);
Break
Default
Break
}

Now we draw the underlying cgimage into a new context, applying the transform
Calculated above.
Cgcontextref CTX = cgbitmapcontextcreate (NULL, AImage.size.width, AImage.size.height,
Cgimagegetbitspercomponent (Aimage.cgimage), 0,
Cgimagegetcolorspace (Aimage.cgimage),
Cgimagegetbitmapinfo (Aimage.cgimage));
CGCONTEXTCONCATCTM (CTX, transform);
Switch (aimage.imageorientation) {
Case Uiimageorientationleft:
Case uiimageorientationleftmirrored:
Case Uiimageorientationright:
Case uiimageorientationrightmirrored:
Grr ...
Cgcontextdrawimage (CTX, CGRectMake (0,0,aimage.size.height,aimage.size.width), aimage.cgimage);
Break

Default
Cgcontextdrawimage (CTX, CGRectMake (0,0,aimage.size.width,aimage.size.height), aimage.cgimage);
Break
}

And now we just create a new UIImage from the drawing context
Cgimageref cgimg = Cgbitmapcontextcreateimage (CTX);
UIImage *img = [UIImage imagewithcgimage:cgimg];
Cgcontextrelease (CTX);
Cgimagerelease (CGIMG);
return img;
}

Fix photo Orientation