好吧我有一個難以追蹤這個內存泄漏的世界。運行這個腳本時,我沒有看到任何內存泄漏,但我的對象正在爬升。 Instruments指向CGBitmapContextCreateImage> create_bitmap_data_provider> malloc,這佔用了我objectalloc的60%。iPhone - UIImage泄漏,CGBitmapContextCreateImage泄漏
該代碼被稱爲NSTimer多次。
//GET IMAGE FROM RESOURCE DIR
NSString * fileLocation = [[NSBundle mainBundle] pathForResource:imgMain ofType:@"jpg"];
NSData * imageData = [NSData dataWithContentsOfFile:fileLocation];
UIImage * blurMe = [UIImage imageWithData:imageData];
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
UIImage * scaledImage = [blurMe _imageScaledToSize:CGSizeMake(blurMe.size.width/dblBlurLevel, blurMe.size.width/dblBlurLevel) interpolationQuality:3.0];
UIImage * labelImage = [scaledImage _imageScaledToSize:blurMe.size interpolationQuality:3.0];
UIImage * imageCopy = [[UIImage alloc] initWithCGImage:labelImage.CGImage];
[pool drain]; // deallocates scaledImage and labelImage
imgView.image = imageCopy;
[imageCopy release];
下面是模糊函數。我相信objectalloc問題位於這裏。也許我只需要一雙清新的眼睛。如果有人能夠弄清楚這一點,那會很棒。對不起,這是很長的...我會盡量縮短它。
@implementation UIImage(Blur)
- (UIImage *)blurredCopy:(int)pixelRadius
{
//VARS
unsigned char *srcData, *destData, *finalData;
CGContextRef context = NULL;
CGColorSpaceRef colorSpace;
void * bitmapData;
int bitmapByteCount;
int bitmapBytesPerRow;
//IMAGE SIZE
size_t pixelsWide = CGImageGetWidth(self.CGImage);
size_t pixelsHigh = CGImageGetHeight(self.CGImage);
bitmapBytesPerRow = (pixelsWide * 4);
bitmapByteCount = (bitmapBytesPerRow * pixelsHigh);
colorSpace = CGColorSpaceCreateDeviceRGB();
if (colorSpace == NULL) { return NULL; }
bitmapData = malloc(bitmapByteCount);
if (bitmapData == NULL) { CGColorSpaceRelease(colorSpace); }
context = CGBitmapContextCreate (bitmapData,
pixelsWide,
pixelsHigh,
8,
bitmapBytesPerRow,
colorSpace,
kCGImageAlphaPremultipliedFirst);
if (context == NULL) { free (bitmapData); }
CGColorSpaceRelease(colorSpace);
free (bitmapData);
if (context == NULL) { return NULL; }
//PREPARE BLUR
size_t width = CGBitmapContextGetWidth(context);
size_t height = CGBitmapContextGetHeight(context);
size_t bpr = CGBitmapContextGetBytesPerRow(context);
size_t bpp = (CGBitmapContextGetBitsPerPixel(context)/8);
CGRect rect = {{0,0},{width,height}};
CGContextDrawImage(context, rect, self.CGImage);
// Now we can get a pointer to the image data associated with the bitmap
// context.
srcData = (unsigned char *)CGBitmapContextGetData (context);
if (srcData != NULL)
{
size_t dataSize = bpr * height;
finalData = malloc(dataSize);
destData = malloc(dataSize);
memcpy(finalData, srcData, dataSize);
memcpy(destData, srcData, dataSize);
int sums[5];
int i, x, y, k;
int gauss_sum=0;
int radius = pixelRadius * 2 + 1;
int *gauss_fact = malloc(radius * sizeof(int));
for (i = 0; i < pixelRadius; i++)
{
.....blah blah blah...
THIS IS JUST LONG CODE THE CREATES INT FIGURES
........blah blah blah......
}
if (gauss_fact) { free(gauss_fact); }
}
size_t bitmapByteCount2 = bpr * height;
//CREATE DATA PROVIDER
CGDataProviderRef dataProvider = CGDataProviderCreateWithData(NULL, srcData, bitmapByteCount2, NULL);
//CREATE IMAGE
CGImageRef cgImage = CGImageCreate(
width,
height,
CGBitmapContextGetBitsPerComponent(context),
CGBitmapContextGetBitsPerPixel(context),
CGBitmapContextGetBytesPerRow(context),
CGBitmapContextGetColorSpace(context),
CGBitmapContextGetBitmapInfo(context),
dataProvider,
NULL,
true,
kCGRenderingIntentDefault
);
//RELEASE INFORMATION
CGDataProviderRelease(dataProvider);
CGContextRelease(context);
if (destData) { free(destData); }
if (finalData) { free(finalData); }
if (srcData) { free(srcData); }
UIImage *retUIImage = [UIImage imageWithCGImage:cgImage];
CGImageRelease(cgImage);
return retUIImage;
}
我能想到的唯一的事情是阻礙了被ObjectAlloc中本的UIImage * retUIImage = [UIImage的imageWithCGImage:cgImage] ...但如何做我釋放它已經返回後?希望有人可以幫忙。
我不知道,如果它涉及到泄漏,但是你不應該叫'無(位圖數據)'你已經發布的上下文之前。用malloc()分配的內存塊沒有保留計數器,所以如果你調用'free()'它立即被釋放,即使CGContext正在使用它。 – benzado 2009-12-30 20:37:41
你是針對iPhone OS 3.1還是更高?這可能是3.0或更早版本框架中的一個錯誤。 如果你使用3.1,你不需要爲'CGBitmapContextCreate'分配bitmapData。 另外'_imageScaledToSize'是一個未記錄的調用。請不要使用它。如果您使用無證電話,有些人可能不願意回答您的問題。 – lucius 2010-01-12 03:57:57
嘿bbullis21你的模糊代碼工作正常嗎? – Leena 2012-01-05 14:24:05