mattgemmell / mgimageutilities Goto Github PK

I tried using this category on a project that has camera functionality. Unfortunately the scaled output is screwy when the input image is a photo taken in portrait mode. It comes out distorted. The type and magnitude of the distortion varies depending on what scaling mode you use, but it's always pretty severe.

Try using the image file below (direct from my iphone 4s) in the sample project. The distortion appears there for me.

https://dl.dropbox.com/u/24362489/image.jpg

Hi,

If I use the categories on an IOS 6 SDK project. I am getting the following on the console:

: CGContextDrawImage: invalid context 0x0
: CGBitmapContextCreateImage: invalid context 0x0

While debugging it I am able to pinpoint the issue but have not been able to find a remedy for it. The issue is that context is null:

CGContextRef context = CGBitmapContextCreate(NULL, scaledWidth, scaledHeight, 8, (scaledWidth * 4),colorSpace, kCGImageAlphaPremultipliedLast);

Any solution you can provide would be a great help.

Hi,

I looked out the code & tried with several ways. though the cropping is supported in the whole image i,e By passing the origin & size parameters but I didn't find where user can crop the image like a Right Angle Triangle , means cropping at an angle of 45 *.

• (UIImage *)imageToFitSize:(CGSize)fitSize method:(MGImageResizingMethod)resizeMethod;

This method doesnot support cropping if user wish to have the partial image since one wo'nt be able to pass the paramters other than Height ,width & Origin.

Required Output :

   -------
   |\      |
   |  \    |
   |    \  |
   |      \|
   -------

There is a problem with the current availability check. In UIImage+Tint.m the current code is:

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000
        if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 4.0) {
            UIGraphicsBeginImageContextWithOptions([self size], NO, 0.0); // 0.0 for scale means "scale for device's main screen".
        }
#else
        if ([[[UIDevice currentDevice] systemVersion] floatValue] < 4.0) {
            UIGraphicsBeginImageContext([self size]);
        }
#endif

However, imagine you compile against iOS 4.0, so __IPHONE_OS_VERSION_MAX_ALLOWED will be 40000, thus only

        if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 4.0) {
            UIGraphicsBeginImageContextWithOptions([self size], NO, 0.0); // 0.0 for scale means "scale for device's main screen".
        }

will get compiled. Now run the app in iOS prior to 4.0 and no context will get created, since the if-statement will return NO. Vice versa is the same of course, compiled against 3.x.x and run in iOS 4.x.x will not work.

I have a fork already available at http://github.com/JoostK/MGImageUtilities which fixes the problem.

Cropping sprite works well, but it does not support for the tint color.