CGImageDestinationFinalize或UIImageJPEGRepresentation-在IOS 10上保存大文件时崩溃 [英] CGImageDestinationFinalize or UIImageJPEGRepresentation - Crash when saving a large file on IOS 10

问题描述

我正在尝试为更大的图像创建图块，并且似乎从IOS 10开始，以下代码不再起作用，并因EXC_BAD_ACCESS而崩溃。

I am trying to create tiles for a larger image, and it seems that as of IOS 10 the following code no longer works and crashes with EXC_BAD_ACCESS.

仅在IOS 10设备上会发生这种情况，IOS 9可以正常工作。

This happens on IOS 10 Device only, IOS 9 works fine.

崩溃的任何图像都会发生大于〜1300x1300。

The crash happens with any image that is larger than ~1300x1300.

在仪器中进行配置不会产生任何有趣的结果，并指向CGImageDestinationFinalize。

Profiling in instruments doesn't yield anything interesting and points to CGImageDestinationFinalize.

没有内存高峰。

我在下面尝试了两种方式：

I tried both ways below:

UIImage* tempImage = [UIImage imageWithCGImage:tileImage];
NSData*  imageData = UIImageJPEGRepresentation(tempImage, 0.8f); // CRASH HERE.

OR

+ (BOOL) CGImageWriteToFile: (CGImageRef) image andPath: (NSString *)path
{
    CFURLRef url = (__bridge CFURLRef)[NSURL fileURLWithPath:path];
    CGImageDestinationRef destination = CGImageDestinationCreateWithURL(url, kUTTypeJPEG, 1, NULL);
    if (!destination) {
        NSLog(@"Failed to create CGImageDestination for %@", path);
        return NO;
    }

    CGImageDestinationAddImage(destination, image, nil);

    if (!CGImageDestinationFinalize(destination)) { // CRASH HERE
        NSLog(@"Failed to write image to %@", path);
        CFRelease(destination);
        return NO;
    }

    CFRelease(destination);

据我了解，UIImageJPEGRepresentation最终会调用CGImageDestinationFinalize。

As I understand it UIImageJPEGRepresentation in turn calls CGImageDestinationFinalize eventually.

编辑：忘了提一下图像是写到硬盘上的，但是大约是一半。

Forgot to mention the images are written to hdd, but about half way through.

这确实确实与IOS 10有关，

This really does seem like something to do with IOS 10, could this be a bug?

我也向苹果提交了该错误，以防万一。

I also filed the bug with apple just in case.

任何帮助或

推荐答案

我将在这里回答自己的问题。

I am going to answer my own question here.

我收集到的内容是，IOS 10无法保存颜色模式为 灰度的文件。

What I have gathered is that IOS 10 has trouble saving a file that has color mode "grayscale".

因此，如果您这样做

UIImageJPEGRepresentation(tempImage, 0.8f)

，如果tempImage为 grayscale ，则会崩溃。

and if tempImage is grayscale you will get a crash.

我正在处理许多图像，直到后来它才与图像的颜色模式相关。

I was processing many images and it didn't click until later that it could be related to the color mode of the image.

我已经向苹果提交了一个错误，以了解他们的意见，但与此同时，我不得不找到一个临时解决方案。

I already filed a bug with apple to see what they say, but meanwhile I had to find a temporary fix.

我的解决方案是通过以下方式将图像转换为RGB：绘制并捕获到新图像中。

My fix was to convert image to RGB by drawing it and capturing it into a new image.

示例方法：

+ (UIImage *)convertImage:(UIImage *)sourceImage
{
    UIGraphicsBeginImageContext(sourceImage.size);
    [sourceImage drawInRect:CGRectMake( 0, 0, sourceImage.size.width, sourceImage.size.height)];

    UIImage *targetImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return targetImage;
}

希望这对某人有所帮助。

Hopefully this helps someone.

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