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Memory usage upgrade 

autorelease the bitmap context for clearing cache when memory warnings
This commit is contained in:
lagapollo 2015-10-07 17:20:45 +02:00
parent eec1b67497
commit 65fbc3b85a
1 changed files with 48 additions and 40 deletions
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72
SDWebImage/SDWebImageDecoder.m
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@ -13,49 +13,57 @@
@implementation UIImage (ForceDecode)
+ (UIImage *)decodedImageWithImage:(UIImage *)image {
// do not decode animated images
if (image.images) { return image; }
// while downloading huge amount of images
// autorelease the bitmap context
// and all vars to help system to free memory
// when there are memory warning.
// on iOS7, do not forget to call
// [[SDImageCache sharedImageCache] clearMemory];
@autoreleasepool{
// do not decode animated images
if (image.images) { return image; }
CGImageRef imageRef = image.CGImage;
CGImageRef imageRef = image.CGImage;
CGImageAlphaInfo alpha = CGImageGetAlphaInfo(imageRef);
BOOL anyAlpha = (alpha == kCGImageAlphaFirst ||
alpha == kCGImageAlphaLast ||
alpha == kCGImageAlphaPremultipliedFirst ||
alpha == kCGImageAlphaPremultipliedLast);
CGImageAlphaInfo alpha = CGImageGetAlphaInfo(imageRef);
BOOL anyAlpha = (alpha == kCGImageAlphaFirst ||
alpha == kCGImageAlphaLast ||
alpha == kCGImageAlphaPremultipliedFirst ||
alpha == kCGImageAlphaPremultipliedLast);
if (anyAlpha) { return image; }
if (anyAlpha) { return image; }
size_t width = CGImageGetWidth(imageRef);
size_t height = CGImageGetHeight(imageRef);
size_t width = CGImageGetWidth(imageRef);
size_t height = CGImageGetHeight(imageRef);
// current
CGColorSpaceModel imageColorSpaceModel = CGColorSpaceGetModel(CGImageGetColorSpace(imageRef));
CGColorSpaceRef colorspaceRef = CGImageGetColorSpace(imageRef);
// current
CGColorSpaceModel imageColorSpaceModel = CGColorSpaceGetModel(CGImageGetColorSpace(imageRef));
CGColorSpaceRef colorspaceRef = CGImageGetColorSpace(imageRef);
bool unsupportedColorSpace = (imageColorSpaceModel == 0 || imageColorSpaceModel == -1 || imageColorSpaceModel == kCGColorSpaceModelIndexed);
if (unsupportedColorSpace)
colorspaceRef = CGColorSpaceCreateDeviceRGB();
bool unsupportedColorSpace = (imageColorSpaceModel == 0 || imageColorSpaceModel == -1 || imageColorSpaceModel == kCGColorSpaceModelIndexed);
if (unsupportedColorSpace)
colorspaceRef = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(NULL, width,
height,
CGImageGetBitsPerComponent(imageRef),
0,
colorspaceRef,
kCGBitmapByteOrderDefault | kCGImageAlphaPremultipliedFirst);
CGContextRef context = CGBitmapContextCreate(NULL, width,
height,
CGImageGetBitsPerComponent(imageRef),
0,
colorspaceRef,
kCGBitmapByteOrderDefault | kCGImageAlphaPremultipliedFirst);
// Draw the image into the context and retrieve the new image, which will now have an alpha layer
CGContextDrawImage(context, CGRectMake(0, 0, width, height), imageRef);
CGImageRef imageRefWithAlpha = CGBitmapContextCreateImage(context);
UIImage *imageWithAlpha = [UIImage imageWithCGImage:imageRefWithAlpha];
// Draw the image into the context and retrieve the new image, which will now have an alpha layer
CGContextDrawImage(context, CGRectMake(0, 0, width, height), imageRef);
CGImageRef imageRefWithAlpha = CGBitmapContextCreateImage(context);
UIImage *imageWithAlpha = [UIImage imageWithCGImage:imageRefWithAlpha];
if (unsupportedColorSpace)
CGColorSpaceRelease(colorspaceRef);
if (unsupportedColorSpace)
CGColorSpaceRelease(colorspaceRef);
CGContextRelease(context);
CGImageRelease(imageRefWithAlpha);
CGContextRelease(context);
CGImageRelease(imageRefWithAlpha);
return imageWithAlpha;
return imageWithAlpha;
}
}
@end