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Darcy Liu
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add PocketCoreImage
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‎PocketCoreImage.zip‎

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‎PocketCoreImage/PocketCoreImage/PocketCoreImage.xcodeproj/project.pbxproj‎

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‎PocketCoreImage/PocketCoreImage/PocketCoreImage/FilterDetailCategory.m‎

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/*
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File: FilterDetailCategory.m
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Abstract: Extensions to MainViewController that handle configuring a CIFilter's parameters with
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random values.
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Version: 1.0
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Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
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Inc. ("Apple") in consideration of your agreement to the following
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terms, and your use, installation, modification or redistribution of
10+
this Apple software constitutes acceptance of these terms. If you do
11+
not agree with these terms, please do not use, install, modify or
12+
redistribute this Apple software.
13+
14+
In consideration of your agreement to abide by the following terms, and
15+
subject to these terms, Apple grants you a personal, non-exclusive
16+
license, under Apple's copyrights in this original Apple software (the
17+
"Apple Software"), to use, reproduce, modify and redistribute the Apple
18+
Software, with or without modifications, in source and/or binary forms;
19+
provided that if you redistribute the Apple Software in its entirety and
20+
without modifications, you must retain this notice and the following
21+
text and disclaimers in all such redistributions of the Apple Software.
22+
Neither the name, trademarks, service marks or logos of Apple Inc. may
23+
be used to endorse or promote products derived from the Apple Software
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without specific prior written permission from Apple. Except as
25+
expressly stated in this notice, no other rights or licenses, express or
26+
implied, are granted by Apple herein, including but not limited to any
27+
patent rights that may be infringed by your derivative works or by other
28+
works in which the Apple Software may be incorporated.
29+
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The Apple Software is provided by Apple on an "AS IS" basis. APPLE
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MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
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THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
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FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
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OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
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IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
39+
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
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MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
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AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
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STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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Copyright (C) 2011 Apple Inc. All Rights Reserved.
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*/
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#import "MainViewController.h"
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@implementation MainViewController (FilterDetailCategory)
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//
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// Helper method.
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// Returns an NSDictionary containg only the parameters we want our configure method
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// to operate on.
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+ (NSDictionary*)deriveEditableAttributesForFilter:(CIFilter*)filter
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{
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NSMutableDictionary *editableAttributes = [NSMutableDictionary dictionary];
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NSDictionary *filterAttributes = [filter attributes];
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for (NSString *key in filterAttributes) {
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if ([key isEqualToString:@"CIAttributeFilterCategories"]) continue;
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else if ([key isEqualToString:@"CIAttributeFilterDisplayName"]) continue;
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else if ([key isEqualToString:@"inputImage"]) continue;
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else if ([key isEqualToString:@"outputImage"]) continue;
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else if (![[[filter attributes] objectForKey:key] isKindOfClass:[NSDictionary class]]) continue;
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[editableAttributes setObject:[[filter attributes] objectForKey:key] forKey:key];
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}
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return editableAttributes;
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}
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//
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// Helper function that returns a random float value within the specified range.
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float randFloat(float a, float b);
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float randFloat(float a, float b)
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{
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srand(time(NULL));
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return ((b-a)*((float)arc4random()/RAND_MAX))+a;
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}
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//
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// Given a filter, examine all its parameters and configure them with randomly generated values.
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+ (void)configureFilter:(CIFilter*)filter
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{
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// Get the filter's parameters we're interested in configuring here.
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NSDictionary *editableAttributes = [MainViewController deriveEditableAttributesForFilter:filter];
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for (NSString *key in editableAttributes) {
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NSDictionary *attributeDictionary = [editableAttributes objectForKey:key];
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// Our method here only supports generating random values for parameters that expect numbers.
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// Some paramters take an image, color, or vector.
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if ([[attributeDictionary objectForKey:kCIAttributeClass] isEqualToString:@"NSNumber"]) {
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// The number types are further broken down into sub types. For our purposes, we
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// can group them into types that require either a boolean, float, or integer.
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if ([attributeDictionary objectForKey:kCIAttributeType] == kCIAttributeTypeBoolean)
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{
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NSInteger randomValue = (rand() % 2);
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NSLog(@"Setting %i for key %@ of type BOOL", randomValue, key);
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[filter setValue:[NSNumber numberWithInteger:randomValue] forKey:key];
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}
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else if([attributeDictionary objectForKey:kCIAttributeType] == kCIAttributeTypeScalar ||
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[attributeDictionary objectForKey:kCIAttributeType] == kCIAttributeTypeDistance ||
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[attributeDictionary objectForKey:kCIAttributeType] == kCIAttributeTypeAngle)
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{
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// Get the min and max values
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float maximumValue = [[attributeDictionary valueForKey:kCIAttributeSliderMax] floatValue];
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float minimumValue = [[attributeDictionary valueForKey:kCIAttributeSliderMin] floatValue];
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float randomValue = randFloat(minimumValue, maximumValue);
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NSLog(@"Setting %f for key %@ of type Decimal", randomValue, key);
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[filter setValue:[NSNumber numberWithFloat:randomValue] forKey:key];
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}
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else
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{
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// Get the min and max values
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NSInteger maximumValue = [[attributeDictionary valueForKey:kCIAttributeMax] integerValue];
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NSInteger minimumValue = [[attributeDictionary valueForKey:kCIAttributeMin] integerValue];
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NSInteger randomValue = (rand() % (maximumValue - minimumValue)) + minimumValue;
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NSLog(@"Setting %i for key %@ of type Integer", randomValue, key);
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[filter setValue:[NSNumber numberWithInteger:randomValue] forKey:key];
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}
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}
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}
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}
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@end

‎PocketCoreImage/PocketCoreImage/PocketCoreImage/FilteredImageView.h‎

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/*
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File: FilteredImageView.h
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Abstract: UIView subclass that renders a UIImage with a set of filters applied.
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The filters are requested from it's data source.
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Version: 1.0
6+
7+
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
8+
Inc. ("Apple") in consideration of your agreement to the following
9+
terms, and your use, installation, modification or redistribution of
10+
this Apple software constitutes acceptance of these terms. If you do
11+
not agree with these terms, please do not use, install, modify or
12+
redistribute this Apple software.
13+
14+
In consideration of your agreement to abide by the following terms, and
15+
subject to these terms, Apple grants you a personal, non-exclusive
16+
license, under Apple's copyrights in this original Apple software (the
17+
"Apple Software"), to use, reproduce, modify and redistribute the Apple
18+
Software, with or without modifications, in source and/or binary forms;
19+
provided that if you redistribute the Apple Software in its entirety and
20+
without modifications, you must retain this notice and the following
21+
text and disclaimers in all such redistributions of the Apple Software.
22+
Neither the name, trademarks, service marks or logos of Apple Inc. may
23+
be used to endorse or promote products derived from the Apple Software
24+
without specific prior written permission from Apple. Except as
25+
expressly stated in this notice, no other rights or licenses, express or
26+
implied, are granted by Apple herein, including but not limited to any
27+
patent rights that may be infringed by your derivative works or by other
28+
works in which the Apple Software may be incorporated.
29+
30+
The Apple Software is provided by Apple on an "AS IS" basis. APPLE
31+
MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
32+
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
33+
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
34+
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
35+
36+
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
37+
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
38+
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
39+
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
40+
MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
41+
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
42+
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
43+
POSSIBILITY OF SUCH DAMAGE.
44+
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Copyright (C) 2011 Apple Inc. All Rights Reserved.
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*/
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#import <UIKit/UIKit.h>
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@protocol FilteredViewDatasource <NSObject>
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- (NSMutableArray*)filtersToApply;
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@end
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@interface FilteredImageView : UIView {
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CIImage *_filteredImage;
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}
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@property (nonatomic, weak) IBOutlet id<FilteredViewDatasource> datasource;
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@property (nonatomic, strong) UIImage *inputImage;
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- (void)reloadData;
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@end

‎PocketCoreImage/PocketCoreImage/PocketCoreImage/FilteredImageView.m‎

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/*
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File: FilteredImageView.m
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Abstract: UIView subclass that renders a UIImage with a set of filters applied.
4+
The filters are requested from it's data source.
5+
Version: 1.0
6+
7+
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
8+
Inc. ("Apple") in consideration of your agreement to the following
9+
terms, and your use, installation, modification or redistribution of
10+
this Apple software constitutes acceptance of these terms. If you do
11+
not agree with these terms, please do not use, install, modify or
12+
redistribute this Apple software.
13+
14+
In consideration of your agreement to abide by the following terms, and
15+
subject to these terms, Apple grants you a personal, non-exclusive
16+
license, under Apple's copyrights in this original Apple software (the
17+
"Apple Software"), to use, reproduce, modify and redistribute the Apple
18+
Software, with or without modifications, in source and/or binary forms;
19+
provided that if you redistribute the Apple Software in its entirety and
20+
without modifications, you must retain this notice and the following
21+
text and disclaimers in all such redistributions of the Apple Software.
22+
Neither the name, trademarks, service marks or logos of Apple Inc. may
23+
be used to endorse or promote products derived from the Apple Software
24+
without specific prior written permission from Apple. Except as
25+
expressly stated in this notice, no other rights or licenses, express or
26+
implied, are granted by Apple herein, including but not limited to any
27+
patent rights that may be infringed by your derivative works or by other
28+
works in which the Apple Software may be incorporated.
29+
30+
The Apple Software is provided by Apple on an "AS IS" basis. APPLE
31+
MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
32+
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
33+
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
34+
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
35+
36+
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
37+
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
38+
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
39+
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
40+
MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
41+
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
42+
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
43+
POSSIBILITY OF SUCH DAMAGE.
44+
45+
Copyright (C) 2011 Apple Inc. All Rights Reserved.
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*/
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#import "FilteredImageView.h"
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@implementation FilteredImageView
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@synthesize datasource;
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@synthesize inputImage = _inputImage;
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//
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// Requests the list of filters from the data source and applies each filter
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// in order to the _inputImage.
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- (void)reloadData
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{
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if (!_inputImage)
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return;
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// Create a CIImage from the _inputImage. While UIImage has a property returning
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// a CIImage representation of it, there are cases where it will not work. This is the
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// most compatible route.
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_filteredImage = [[CIImage alloc] initWithCGImage:_inputImage.CGImage options:nil];
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// Retrieve the list of CIFilters to apply from our datasource.
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NSArray *filters = [self.datasource filtersToApply];
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if (filters)
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// Iterate through each filter setting our CIImage as the input and re-assigning
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// the filter's output back to our CIImage. This creates a chaining effect.
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for(CIFilter *filter in filters) {
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[filter setValue:_filteredImage forKey:@"inputImage"];
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// Certain filters place restrictions on their input values that we may not have accounted for
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// in the configuration method. For example, CIColorCube requires its parameter to be a power
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// of 2. In such as case, the filter will throw an exception when we ask it generate and image.
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// Catch the exception and pretend nothing happened thereby bypassing the filter.
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@try {
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_filteredImage = filter.outputImage;
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}
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@catch (NSException* e) { }
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}
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// Inform UIKit that we need to be redrawn.
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[self setNeedsDisplay];
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}
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- (void)drawRect:(CGRect)rect
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{
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[super drawRect:rect];
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if (!_filteredImage)
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return;
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// This is the rect we'll draw our final image into. By making it a bit smaller than our bounds
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// we'll get a nice border.
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CGRect innerBounds = CGRectMake(5, 5, self.bounds.size.width - 10, self.bounds.size.height - 10);
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// To display the image, convert it back to a UIImage and draw it in our rect. UIImage takes
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// into account the orientation of an image when drawing which we would have needed to worry about
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// when drawing it directly with Core Image and Core Graphics calls.
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[[UIImage imageWithCIImage:_filteredImage] drawInRect:innerBounds];
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}
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- (void)setInputImage:(UIImage *)inputImage
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{
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// Since Core Image filters must be operate on every pixel in an image, you may want to
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// consider resizing an input image to the view size before applying any filters.
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//
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_inputImage = inputImage;
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[self reloadData];
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}
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@end

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