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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 <ZBarSDK/ZBarReaderView.h>
#import <ZBarSDK/ZBarReaderViewController.h>
#define MODULE ZBarReaderView
#import "debug.h"
// hack around missing simulator support for AVCapture interfaces
// protected APIs
@interface ZBarReaderView()
- (void) _initWithImageScanner: (ZBarImageScanner*) _scanner;
- (void) initSubviews;
- (void) setImageSize: (CGSize) size;
- (void) didTrackSymbols: (ZBarSymbolSet*) syms;
@end
@interface ZBarReaderViewImpl
: ZBarReaderView
{
ZBarImageScanner *scanner;
UILabel *simLabel;
UIImage *scanImage;
CALayer *previewImage;
BOOL enableCache;
}
@end
@implementation ZBarReaderViewImpl
@synthesize scanner, enableCache;
- (void) _initWithImageScanner: (ZBarImageScanner*) _scanner
{
[super _initWithImageScanner: _scanner];
scanner = [_scanner retain];
[self initSubviews];
}
- (void) initSubviews
{
simLabel = [UILabel new];
simLabel.backgroundColor = [UIColor clearColor];
simLabel.textColor = [UIColor whiteColor];
simLabel.font = [UIFont boldSystemFontOfSize: 20];
simLabel.numberOfLines = 4;
simLabel.textAlignment = UITextAlignmentCenter;
simLabel.text = @"Camera Simulation\n\n"
@"Tap and hold with two \"fingers\" to select image";
simLabel.autoresizingMask =
UIViewAutoresizingFlexibleWidth |
UIViewAutoresizingFlexibleHeight;
[self addSubview: simLabel];
preview = [CALayer new];
[self.layer addSublayer: preview];
previewImage = [CALayer new];
[preview addSublayer: previewImage];
[super initSubviews];
}
- (void) dealloc
{
[scanner release];
scanner = nil;
[simLabel release];
simLabel = nil;
[previewImage release];
previewImage = nil;
[super dealloc];
}
- (AVCaptureDevice*) device
{
return(nil);
}
- (void) setDevice: (AVCaptureDevice*) device
{
// simulated camera does nothing with this
}
- (AVCaptureSession*) session
{
return(nil);
}
- (void) updateCrop
{
previewImage.frame = preview.bounds;
CGRect bounds = self.bounds;
simLabel.frame = CGRectInset(bounds,
bounds.size.width * .05,
bounds.size.height * .05);
}
- (void) start
{
if(started)
return;
[super start];
running = YES;
[self performSelector: @selector(onVideoStart)
withObject: nil
afterDelay: 0.5];
}
- (void) stop
{
if(!started)
return;
[super stop];
running = NO;
[self performSelector: @selector(onVideoStop)
withObject: nil
afterDelay: 0.5];
}
- (void) scanImage: (UIImage*) image
{
// strip EXIF info
CGImageRef cgimage = image.CGImage;
image = [[UIImage alloc]
initWithCGImage: cgimage
scale: 1.0
orientation: UIImageOrientationUp];
[self setImageSize: image.size];
[self layoutIfNeeded];
[CATransaction begin];
[CATransaction setDisableActions: YES];
previewImage.contentsGravity = kCAGravityResizeAspectFill;
previewImage.transform = CATransform3DMakeRotation(M_PI_2, 0, 0, 1);
previewImage.contents = (id)cgimage;
[CATransaction commit];
ZBarImage *zimg =
[[ZBarImage alloc]
initWithCGImage: cgimage];
CGSize size = zimg.size;
zimg.crop = CGRectMake(effectiveCrop.origin.x * size.width,
effectiveCrop.origin.y * size.height,
effectiveCrop.size.width * size.width,
effectiveCrop.size.height * size.height);
int nsyms = [scanner scanImage: zimg];
zlog(@"scan image: %@ crop=%@ nsyms=%d",
NSStringFromCGSize(size), NSStringFromCGRect(zimg.crop), nsyms);
[zimg release];
if(nsyms > 0) {
scanImage = [image retain];
ZBarSymbolSet *syms = scanner.results;
[self performSelector: @selector(didReadSymbols:)
withObject: syms
afterDelay: .4];
[self performSelector: @selector(didTrackSymbols:)
withObject: syms
afterDelay: .001];
}
[image release];
}
- (void) didReadSymbols: (ZBarSymbolSet*) syms
{
[readerDelegate
readerView: self
didReadSymbols: syms
fromImage: scanImage];
[scanImage release];
scanImage = nil;
}
- (void) onVideoStart
{
if(running &&
[readerDelegate respondsToSelector: @selector(readerViewDidStart:)])
[readerDelegate readerViewDidStart: self];
}
- (void) onVideoStop
{
if(!running &&
[readerDelegate respondsToSelector:
@selector(readerView:didStopWithError:)])
[readerDelegate readerView: self
didStopWithError: nil];
}
@end
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