我一直在研究一些获取图像像素的代码,修改它们然后返回图像。当我在乐器中运行时,它表示在标有★的代码行上有泄漏。下面的代码只是返回没有任何修改的原始像素:内存泄漏与UIImage像素?
CFDataRef CopyImagePixels(CGImageRef inImage) {
return CGDataProviderCopyData(CGImageGetDataProvider(inImage)); }
- (UIImage *) imagePixels:(UIImage*)imge {
CGImageRef img=imge.CGImage;
CFDataRef dataref=CopyImagePixels(img);
UInt8 *data=(UInt8 *)CFDataGetBytePtr(dataref);
int length=CFDataGetLength(dataref);
for (int i = 0; i < length; i+=4)
{
UInt8 b_pixel = data[i];
UInt8 g_pixel = data[i+1];
UInt8 r_pixel = data[i+2];
float outputRed = r_pixel;
float outputGreen = g_pixel;
float outputBlue = b_pixel;
data[i] = outputBlue;
data[i+1] = outputGreen;
data[i+2] = outputRed;
}
CFDataRef newData=CFDataCreate(NULL,data,length);★
CGDataProviderRef provider=CGDataProviderCreateWithCFData(newData);★
CGImageRef newImg=CGImageCreate(CGImageGetWidth(img),CGImageGetHeight(img),CGImageGetBitsPerComponent(img),★
CGImageGetBitsPerPixel(img),CGImageGetBytesPerRow(img),CGImageGetColorSpace(img),
CGImageGetBitmapInfo(img),provider,NULL,true,kCGRenderingIntentDefault);
UIImage*Result = [UIImage imageWithCGImage:newImg];
CGImageRelease(newImg);
CGDataProviderRelease(provider);
CFRelease(newData);
CFRelease(dataref);
return Result; }
我不知道这是为什么出现。我试过寻找答案,但他们都没有工作。
感谢
更新1 泄漏是由这种方法来:
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
ImageView.image = [oimage imagePixels:ImageView.image]; }
而且oimage被设置在这里:
-(void)viewDidAppear:(BOOL)animated {
mainDelegate = (PhotoAppDelegate *)[[UIApplication sharedApplication]delegate];
CGSize size = mainDelegate.CurrentImage.size;
UIGraphicsBeginImageContext(size);
[mainDelegate.CurrentImage drawInRect:CGRectMake(0,0,size.width ,size.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();//LEAK
UIGraphicsEndImageContext();
int kMaxResolution = 300;
CGImageRef imgRef = newImage.CGImage;
CGFloat width = CGImageGetWidth(imgRef);
CGFloat height = CGImageGetHeight(imgRef);
CGRect bounds = CGRectMake(0, 0, width, height);
if (width > kMaxResolution || height > kMaxResolution) {
CGFloat ratio = width/height;
if (ratio > 1) {
bounds.size.width = kMaxResolution;
bounds.size.height = bounds.size.width/ratio;
}
else {
bounds.size.height = kMaxResolution;
bounds.size.width = bounds.size.height * ratio;
}
}
CGSize newsize = CGSizeMake(bounds.size.width, bounds.size.height);
UIGraphicsBeginImageContext(newsize);
[newImage drawInRect:CGRectMake(0, 0, newsize.width, newsize.height)];
newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
oimage = [newImage retain];
ImageView.image = oimage; }
此外,在右侧栏仪器,点击一个物体在底部中央窗口的泄漏将显示你在侧边栏里的李nk来自你的代码。
在此先感谢
难道你返回的UIImage是越来越莫名其妙地泄露?保留在某处并迷路,永不离开?这将导致底层提供的数据泄露,但你会觉得泄漏会在这种情况下指出,泄漏的UIImage以及... – 2011-04-09 14:08:37