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//------------------------------------------------------------------------
// Copyright 2010 (c) Jeff Brown <spadix@users.sourceforge.net>
//
// This file is part of the ZBar Bar Code Reader.
//
// The ZBar Bar Code Reader is free software; you can redistribute it
// and/or modify it under the terms of the GNU Lesser Public License as
// published by the Free Software Foundation; either version 2.1 of
// the License, or (at your option) any later version.
//
// The ZBar Bar Code Reader is distributed in the hope that it will be
// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser Public License for more details.
//
// You should have received a copy of the GNU Lesser Public License
// along with the ZBar Bar Code Reader; if not, write to the Free
// Software Foundation, Inc., 51 Franklin St, Fifth Floor,
// Boston, MA 02110-1301 USA
//
// http://sourceforge.net/projects/zbar
//------------------------------------------------------------------------
#import <UIKit/UIKit.h>
#import "ZBarImageScanner.h"
@class AVCaptureSession, AVCaptureDevice;
@class CALayer;
@class ZBarImageScanner, ZBarCaptureReader, ZBarReaderView;
// delegate is notified of decode results.
@protocol ZBarReaderViewDelegate <NSObject>
- (void)readerView:(ZBarReaderView *)readerView
didReadSymbols:(ZBarSymbolSet *)symbols
fromImage:(UIImage *)image;
@optional
- (void)readerViewDidStart:(ZBarReaderView *)readerView;
- (void)readerView:(ZBarReaderView *)readerView
didStopWithError:(NSError *)error;
@end
// read barcodes from the displayed video preview. the view maintains
// a complete video capture session feeding a ZBarCaptureReader and
// presents the associated preview with symbol tracking annotations.
@interface ZBarReaderView : UIView {
id<ZBarReaderViewDelegate> readerDelegate;
ZBarCaptureReader *captureReader;
CGRect scanCrop, effectiveCrop;
CGAffineTransform previewTransform;
CGFloat zoom, zoom0, maxZoom;
UIColor *trackingColor;
BOOL tracksSymbols, showsFPS;
NSInteger torchMode;
UIInterfaceOrientation interfaceOrientation;
NSTimeInterval animationDuration;
CALayer *preview, *overlay, *tracking, *cropLayer;
UIView *fpsView;
UILabel *fpsLabel;
UIPinchGestureRecognizer *pinch;
CGFloat imageScale;
CGSize imageSize;
BOOL started, running, locked;
}
// supply a pre-configured image scanner.
- (id)initWithImageScanner:(ZBarImageScanner *)imageScanner;
// start the video stream and barcode reader.
- (void)start;
// stop the video stream and barcode reader.
- (void)stop;
// clear the internal result cache
- (void)flushCache;
// compensate for device/camera/interface orientation
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)orient
duration:(NSTimeInterval)duration;
// delegate is notified of decode results.
@property (nonatomic, assign) id<ZBarReaderViewDelegate> readerDelegate;
// access to image scanner for configuration.
@property (nonatomic, readonly) ZBarImageScanner *scanner;
// whether to display the tracking annotation for uncertain barcodes
// (default YES).
@property (nonatomic) BOOL tracksSymbols;
// color of the tracking box (default green)
@property (nonatomic, retain) UIColor *trackingColor;
// enable pinch gesture recognition for zooming the preview/decode
// (default YES).
@property (nonatomic) BOOL allowsPinchZoom;
// torch mode to set automatically (default Auto).
@property (nonatomic) NSInteger torchMode;
// whether to display the frame rate for debug/configuration
// (default NO).
@property (nonatomic) BOOL showsFPS;
// zoom scale factor applied to video preview *and* scanCrop.
// also updated by pinch-zoom gesture. clipped to range [1,maxZoom],
// defaults to 1.25
@property (nonatomic) CGFloat zoom;
- (void)setZoom:(CGFloat)zoom animated:(BOOL)animated;
// maximum settable zoom factor.
@property (nonatomic) CGFloat maxZoom;
// the region of the image that will be scanned. normalized coordinates.
@property (nonatomic) CGRect scanCrop;
// additional transform applied to video preview.
// (NB *not* applied to scan crop)
@property (nonatomic) CGAffineTransform previewTransform;
// specify an alternate capture device.
@property (nonatomic, retain) AVCaptureDevice *device;
// direct access to the capture session. warranty void if opened...
@property (nonatomic, readonly) AVCaptureSession *session;
@property (nonatomic, readonly) ZBarCaptureReader *captureReader;
// this flag still works, but its use is deprecated
@property (nonatomic) BOOL enableCache;
@end
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