// // CDVMWBarcodeScanner.m // CameraDemo // // Created by vladimir zivkovic on 5/8/13. // // #import "CDVMWBarcodeScanner.h" #import "BarcodeScanner.h" #import "MWScannerViewController.h" #import #import "MWOverlay.h" #import "MWParser.h" @implementation CDVMWBarcodeScanner NSString *callbackId; NSMutableDictionary *customParams = nil; MWScannerViewController *scannerViewController; - (void)initDecoder:(CDVInvokedUrlCommand*)command { [MWScannerViewController initDecoder]; CDVPluginResult* pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_OK]; [self.commandDelegate sendPluginResult:pluginResult callbackId:command.callbackId]; } float leftP; float topP; float widthP; float heightP; AVCaptureVideoPreviewLayer *previewLayer; UIInterfaceOrientation currentOrientation; UIImageView *overlayImage; BOOL useAutoRect = true; BOOL useFCamera = false; NSMutableDictionary *recgtVals; - (void)startScannerView:(CDVInvokedUrlCommand*)command { if (![self.viewController.view viewWithTag:9158436]) { recgtVals = nil; currentOrientation = [[UIApplication sharedApplication]statusBarOrientation]; scannerViewController = [[MWScannerViewController alloc] initWithNibName:@"MWScannerViewController" bundle:nil]; scannerViewController.delegate = self; [MWScannerViewController setUseFrontCamera:useFCamera]; scannerViewController.customParams = customParams; [[NSNotificationCenter defaultCenter] addObserver: self selector:@selector(decodeNotification:) name: @"DecoderResultNotification" object: nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didRotate:) name:@"UIDeviceOrientationDidChangeNotification" object:nil]; leftP =[[command.arguments objectAtIndex:0]floatValue]; topP =[[command.arguments objectAtIndex:1]floatValue]; widthP =[[command.arguments objectAtIndex:2]floatValue]; heightP =[[command.arguments objectAtIndex:3]floatValue]; float x = leftP /100 * [[UIScreen mainScreen] bounds].size.width; float y = topP /100 * [[UIScreen mainScreen] bounds].size.height; float width = widthP /100 *[[UIScreen mainScreen] bounds].size.width; float height =heightP /100 *[[UIScreen mainScreen] bounds].size.height; UIView *view = [[UIView alloc]initWithFrame:CGRectMake(x,y,width,height)]; [view setTag:9158436]; previewLayer = [scannerViewController generateLayerWithRect:CGPointMake(width, height)]; [view.layer addSublayer:previewLayer]; [self.viewController.view addSubview:view]; scannerViewController.state = LAUNCHING_CAMERA; [scannerViewController.captureSession startRunning]; scannerViewController.state = CAMERA; [CDVMWBarcodeScanner setAutoRect:previewLayer]; if ([MWScannerViewController getOverlayMode] == 1) { [MWOverlay setPaused:NO]; [MWOverlay addToPreviewLayer:previewLayer]; }else if([MWScannerViewController getOverlayMode] == 2){ overlayImage = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, width, height)]; overlayImage.contentMode = UIViewContentModeScaleToFill; overlayImage.image = [UIImage imageNamed:@"overlay_mw.png"]; [view addSubview:overlayImage]; } if ([MWScannerViewController isFlashEnabled]) { scannerViewController.flashButton = [[UIButton alloc]initWithFrame:CGRectMake(view.frame.size.width-10-35, 10, 35, 35)]; [scannerViewController.flashButton setImage:[UIImage imageNamed:@"flashbuttonoff.png"] forState:UIControlStateNormal]; [scannerViewController.flashButton setImage:[UIImage imageNamed:@"flashbuttonon.png"] forState:UIControlStateSelected]; [scannerViewController.flashButton setSelected:NO]; [scannerViewController.flashButton setHidden:NO]; [scannerViewController.flashButton setBackgroundImage:nil forState:UIControlStateSelected]; [scannerViewController.flashButton setBackgroundImage:nil forState:UIControlStateNormal]; [scannerViewController.flashButton addTarget:scannerViewController action:@selector(doFlashToggle:) forControlEvents:UIControlEventTouchUpInside]; [view addSubview:scannerViewController.flashButton]; } if ([MWScannerViewController isZoomEnabled]) { scannerViewController.zoomButton = [[UIButton alloc]initWithFrame:CGRectMake(10, 10, 35, 35)]; [scannerViewController.zoomButton setImage:[UIImage imageNamed:@"zoom.png"] forState:UIControlStateNormal]; [scannerViewController.zoomButton setHidden:NO]; [scannerViewController.zoomButton setBackgroundImage:nil forState:UIControlStateNormal]; [scannerViewController.zoomButton addTarget:scannerViewController action:@selector(doZoomToggle:) forControlEvents:UIControlEventTouchUpInside]; [view addSubview:scannerViewController.zoomButton]; } if (leftP == 0 && topP == 0 && widthP == 1 && heightP == 1) { [view setHidden:YES]; } #if !__has_feature(objc_arc) callbackId= [command.callbackId retain]; #else callbackId= command.callbackId; #endif }else{ [CDVMWBarcodeScanner setAutoRect:previewLayer]; } } - (void)startScanner:(CDVInvokedUrlCommand*)command { [self stopScanner:command]; scannerViewController = [[MWScannerViewController alloc] initWithNibName:@"MWScannerViewController" bundle:nil]; scannerViewController.delegate = self; [MWScannerViewController setUseFrontCamera:useFCamera]; scannerViewController.customParams = customParams; [self.viewController presentViewController:scannerViewController animated:YES completion:^{}]; #if !__has_feature(objc_arc) callbackId= [command.callbackId retain]; #else callbackId= command.callbackId; #endif } -(void)setUseAutorect:(CDVInvokedUrlCommand*)command { useAutoRect = [[command.arguments objectAtIndex:0]boolValue]; } - (void)stopScanner:(CDVInvokedUrlCommand*)command { if ([self.viewController.view viewWithTag:9158436]) { [[self.viewController.view viewWithTag:9158436]removeFromSuperview]; [scannerViewController stopScanning]; previewLayer = nil; [[NSNotificationCenter defaultCenter] removeObserver:self name:@"DecoderResultNotification" object:nil]; [[NSNotificationCenter defaultCenter] removeObserver:self name:@"UIDeviceOrientationDidChangeNotification" object:nil]; scannerViewController = nil; } } - (void)duplicateCodeDelay:(CDVInvokedUrlCommand*)command { MWB_setDuplicatesTimeout([[command.arguments objectAtIndex:0] intValue]); } - (void)scanningFinished:(NSString *)result withType:(NSString *)lastFormat isGS1: (bool) isGS1 andRawResult: (NSData *) rawResult locationPoints:(MWLocation *)locationPoints imageWidth:(int)imageWidth imageHeight:(int)imageHeight { CDVPluginResult* pluginResult = nil; NSMutableArray *bytesArray = [[NSMutableArray alloc] init]; unsigned char *bytes = (unsigned char *) [rawResult bytes]; for (int i = 0; i < rawResult.length; i++){ [bytesArray addObject:[NSNumber numberWithInt: bytes[i]]]; } NSMutableDictionary *resultDict; if (locationPoints) { NSArray *xyArray = [NSArray arrayWithObjects:@"x",@"y", nil]; NSDictionary *p1 = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:[NSNumber numberWithFloat:locationPoints.p1.x],[NSNumber numberWithFloat:locationPoints.p1.y], nil] forKeys:xyArray]; NSDictionary *p2 = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:[NSNumber numberWithFloat:locationPoints.p2.x],[NSNumber numberWithFloat:locationPoints.p2.y], nil] forKeys:xyArray]; NSDictionary *p3 = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:[NSNumber numberWithFloat:locationPoints.p3.x],[NSNumber numberWithFloat:locationPoints.p3.y], nil] forKeys:xyArray]; NSDictionary *p4 = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:[NSNumber numberWithFloat:locationPoints.p4.x],[NSNumber numberWithFloat:locationPoints.p4.y], nil] forKeys:xyArray]; NSDictionary *location =[NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:p1,p2,p3,p4 ,nil] forKeys:[NSArray arrayWithObjects:@"p1",@"p2",@"p3",@"p4",nil]]; resultDict = [[NSMutableDictionary alloc] initWithObjects:[NSArray arrayWithObjects:result, lastFormat, bytesArray, [NSNumber numberWithBool:isGS1], location, [NSNumber numberWithInt:imageWidth],[NSNumber numberWithInt:imageHeight],nil] forKeys:[NSArray arrayWithObjects:@"code", @"type",@"bytes", @"isGS1",@"location",@"imageWidth",@"imageHeight", nil]]; }else{ resultDict = [[NSMutableDictionary alloc] initWithObjects:[NSArray arrayWithObjects:result, lastFormat, bytesArray, [NSNumber numberWithBool:isGS1], [NSNumber numberWithBool:NO], [NSNumber numberWithInt:imageWidth],[NSNumber numberWithInt:imageHeight],nil] forKeys:[NSArray arrayWithObjects:@"code", @"type",@"bytes", @"isGS1",@"location",@"imageWidth",@"imageHeight", nil]]; } pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_OK messageAsDictionary:resultDict]; if(![MWScannerViewController getCloseScannerOnDecode]){ [pluginResult setKeepCallback:[NSNumber numberWithBool:YES]]; } [self.commandDelegate sendPluginResult:pluginResult callbackId:callbackId]; } - (void)decodeNotification: (NSNotification *)notification { if ([notification.object isKindOfClass:[DecoderResult class]]) { DecoderResult *obj = (DecoderResult*)notification.object; if (obj.succeeded) { if ([MWScannerViewController getCloseScannerOnDecode]) { if ([self.viewController.view viewWithTag:9158436]) { [[self.viewController.view viewWithTag:9158436]removeFromSuperview]; [scannerViewController stopScanning]; } } [self scanningFinished:obj.result.text withType: obj.result.typeName isGS1:obj.result.isGS1 andRawResult: [[NSData alloc] initWithBytes: obj.result.bytes length: obj.result.bytesLength] locationPoints:obj.result.locationPoints imageWidth:obj.result.imageWidth imageHeight:obj.result.imageHeight]; } } } + (void) setAutoRect:(AVCaptureVideoPreviewLayer *)layer{ CGPoint p1 = [layer captureDevicePointOfInterestForPoint:CGPointMake(0,0)]; CGPoint p2 = [layer captureDevicePointOfInterestForPoint:CGPointMake(layer.frame.size.width,layer.frame.size.height)]; if (p1.x > p2.x){ float tmp = p1.x; p1.x = p2.x; p2.x = tmp; } if (p1.y > p2.y){ float tmp = p1.y; p1.y = p2.y; p2.y = tmp; } int masks[14] = { MWB_CODE_MASK_25, MWB_CODE_MASK_39, MWB_CODE_MASK_93, MWB_CODE_MASK_128, MWB_CODE_MASK_AZTEC, MWB_CODE_MASK_DM, MWB_CODE_MASK_EANUPC, MWB_CODE_MASK_PDF, MWB_CODE_MASK_QR, MWB_CODE_MASK_RSS, MWB_CODE_MASK_CODABAR, MWB_CODE_MASK_DOTCODE, MWB_CODE_MASK_11, MWB_CODE_MASK_MSI }; if (useAutoRect) { p1.x += 0.02; p1.y += 0.02; p2.x -= 0.02; p2.y -= 0.02; for (int i = 0; i<14; i++) { MWB_setScanningRect(masks[i], p1.x *100, p1.y * 100, (p2.x - p1.x) * 100, (p2.y - p1.y) * 100); } }else{ if (!recgtVals) { recgtVals = [[NSMutableDictionary alloc]init]; for (int i =0; i<14; i++) { float left,top,width,height; MWB_getScanningRect(masks[i], &left, &top, &width, &height); [recgtVals setObject:[NSArray arrayWithObjects:[NSNumber numberWithInt:left],[NSNumber numberWithInt:top],[NSNumber numberWithInt:width],[NSNumber numberWithInt:height], nil] forKey:[NSNumber numberWithInt:masks[i]]]; } }else{ for (int i = 0 ; i<14; i++) { NSArray *rectVals = [[NSArray alloc] initWithArray:[recgtVals objectForKey:[NSNumber numberWithInt:masks[i]]]]; MWB_setScanningRect(masks[i],[[rectVals objectAtIndex:0]intValue], [[rectVals objectAtIndex:1]intValue], [[rectVals objectAtIndex:2]intValue], [[rectVals objectAtIndex:3]intValue]); } } for (int i = 0 ; i<14; i++) { float left,top,width,height; MWB_getScanningRect(masks[i], &left, &top, &width, &height); MWB_setScanningRect(masks[i], (p1.x+ (1- p1.x*2)*(left/100)) *100, (p1.y+ (1-p1.y*2)*(top/100)) * 100, (p2.x - p1.x) * (width/100) * 100, (p2.y - p1.y)*(height/100) * 100); } } } - (void) didRotate:(NSNotification *)notification{ if ([self.viewController.view viewWithTag:9158436] && currentOrientation != [[UIApplication sharedApplication]statusBarOrientation] &&[[UIDevice currentDevice]orientation]<=4 && (int)[[UIDevice currentDevice]orientation] == (int)[UIApplication sharedApplication].statusBarOrientation ) { currentOrientation =[[UIApplication sharedApplication]statusBarOrientation]; UIView *scannerView = [self.viewController.view viewWithTag:9158436]; float x = leftP /100 * [[UIScreen mainScreen] bounds].size.width; float y = topP /100 * [[UIScreen mainScreen] bounds].size.height; float width = widthP /100 *[[UIScreen mainScreen] bounds].size.width; float height =heightP /100 *[[UIScreen mainScreen] bounds].size.height; scannerView.frame =CGRectMake(x,y,width,height); [previewLayer setFrame:CGRectMake(0,0,width,height)]; if(currentOrientation == UIDeviceOrientationLandscapeLeft){ [previewLayer.connection setVideoOrientation:AVCaptureVideoOrientationLandscapeRight]; } else if (currentOrientation == UIDeviceOrientationLandscapeRight){ previewLayer.connection.videoOrientation = AVCaptureVideoOrientationLandscapeLeft; } else if (currentOrientation == UIDeviceOrientationPortrait){ previewLayer.connection.videoOrientation = AVCaptureVideoOrientationPortrait; } else if (currentOrientation == UIDeviceOrientationPortraitUpsideDown){ previewLayer.connection.videoOrientation = AVCaptureVideoOrientationPortraitUpsideDown; } [CDVMWBarcodeScanner setAutoRect:previewLayer]; if ([MWScannerViewController getOverlayMode] == 1) { [MWOverlay removeFromPreviewLayer]; [MWOverlay addToPreviewLayer:previewLayer]; }else if([MWScannerViewController getOverlayMode] == 2){ [overlayImage setFrame:previewLayer.frame]; } if ([MWScannerViewController isFlashEnabled] && scannerViewController.flashButton) { scannerViewController.flashButton.frame = CGRectMake(scannerView.frame.size.width-10-35, 10, 35, 35); } } } - (void)registerCode:(CDVInvokedUrlCommand*)command { int codeMask = [[command.arguments objectAtIndex:0] intValue]; char * userName = (char *) [[command.arguments objectAtIndex:1] UTF8String]; char * key =(char *) [[command.arguments objectAtIndex:2] UTF8String]; MWB_registerCode(codeMask, userName, key); } - (void)registerParser:(CDVInvokedUrlCommand*)command { int codeMask = [[command.arguments objectAtIndex:0] intValue]; char * userName = (char *) [[command.arguments objectAtIndex:1] UTF8String]; char * key =(char *) [[command.arguments objectAtIndex:2] UTF8String]; MWP_registerParser(codeMask, userName, key); } - (void)setActiveCodes:(CDVInvokedUrlCommand*)command { int codeMask = [[command.arguments objectAtIndex:0] intValue]; MWB_setActiveCodes(codeMask); } - (void)useFrontCamera:(CDVInvokedUrlCommand*)command { useFCamera = [[command.arguments objectAtIndex:0] boolValue]; } - (void)setActiveSubcodes:(CDVInvokedUrlCommand*)command { int codeMask = [[command.arguments objectAtIndex:0] intValue]; int subCodeMask = [[command.arguments objectAtIndex:1] intValue]; MWB_setActiveSubcodes(codeMask, subCodeMask); } - (int)getLastType:(CDVInvokedUrlCommand*)command { return MWB_getLastType(); } - (void)setFlags:(CDVInvokedUrlCommand*)command { int codeMask = [[command.arguments objectAtIndex:0] intValue]; int flags = [[command.arguments objectAtIndex:1] intValue]; MWB_setFlags(codeMask, flags); } - (void)setMinLength:(CDVInvokedUrlCommand*)command { int codeMask = [[command.arguments objectAtIndex:0] intValue]; int minLength = [[command.arguments objectAtIndex:1] intValue]; MWB_setMinLength(codeMask, minLength); } - (void)setDirection:(CDVInvokedUrlCommand*)command { int direction = [[command.arguments objectAtIndex:0] intValue]; MWB_setDirection(direction); } - (void)setScanningRect:(CDVInvokedUrlCommand*)command { int codeMask = [[command.arguments objectAtIndex:0] intValue]; int left = [[command.arguments objectAtIndex:1] intValue]; int top = [[command.arguments objectAtIndex:2] intValue]; int width = [[command.arguments objectAtIndex:3] intValue]; int height = [[command.arguments objectAtIndex:4] intValue]; MWB_setScanningRect(codeMask, left, top, width, height); } - (void)setLevel:(CDVInvokedUrlCommand*)command { int level = [[command.arguments objectAtIndex:0] intValue]; MWB_setLevel(level); } - (void)setInterfaceOrientation:(CDVInvokedUrlCommand*)command { NSString *orientation = [command.arguments objectAtIndex:0]; UIInterfaceOrientationMask interfaceOrientation = UIInterfaceOrientationMaskLandscapeLeft; if ([orientation isEqualToString:@"Portrait"]){ interfaceOrientation = UIInterfaceOrientationMaskPortrait; } if ([orientation isEqualToString:@"LandscapeLeft"]){ interfaceOrientation = UIInterfaceOrientationMaskLandscapeLeft; } if ([orientation isEqualToString:@"LandscapeRight"]){ interfaceOrientation = UIInterfaceOrientationMaskLandscapeRight; } if ([orientation isEqualToString:@"All"]){ interfaceOrientation = UIInterfaceOrientationMaskAll; } [MWScannerViewController setInterfaceOrientation:interfaceOrientation]; } - (void)setOverlayMode:(CDVInvokedUrlCommand*)command{ [MWScannerViewController setOverlayMode:[[command.arguments objectAtIndex:0] intValue]]; } - (void)enableHiRes:(CDVInvokedUrlCommand*)command { bool hiRes = [[command.arguments objectAtIndex:0] boolValue]; [MWScannerViewController enableHiRes:hiRes]; } - (void)enableFlash:(CDVInvokedUrlCommand*)command { bool flash = [[command.arguments objectAtIndex:0] boolValue]; [MWScannerViewController enableFlash:flash]; } - (void)enableZoom:(CDVInvokedUrlCommand*)command { bool zoom = [[command.arguments objectAtIndex:0] boolValue]; [MWScannerViewController enableZoom:zoom]; } - (void)closeScannerOnDecode:(CDVInvokedUrlCommand*)command { BOOL shouldClose =[[command.arguments objectAtIndex:0] boolValue]; [MWScannerViewController closeScannerOnDecode:shouldClose]; } - (void)turnFlashOn:(CDVInvokedUrlCommand*)command { bool flash = [[command.arguments objectAtIndex:0] boolValue]; [MWScannerViewController turnFlashOn:flash]; } - (void)toggleFlash:(CDVInvokedUrlCommand*)command { [scannerViewController toggleTorch]; } - (void)toggleZoom:(CDVInvokedUrlCommand*)command { [scannerViewController doZoomToggle:nil]; } - (void)setZoomLevels:(CDVInvokedUrlCommand*)command { [MWScannerViewController setZoomLevels:[[command.arguments objectAtIndex:0] intValue] zoomLevel2:[[command.arguments objectAtIndex:1] intValue] initialZoomLevel:[[command.arguments objectAtIndex:2] intValue]]; } - (void)setMaxThreads:(CDVInvokedUrlCommand*)command { [MWScannerViewController setMaxThreads:[[command.arguments objectAtIndex:0] intValue]]; } - (void)setCustomParam:(CDVInvokedUrlCommand*)command { NSString *key = [command.arguments objectAtIndex:0]; NSObject *value = [command.arguments objectAtIndex:1]; if (customParams == nil){ customParams = [[NSMutableDictionary alloc] init]; } [customParams setObject:value forKey:key]; } - (void)setParam:(CDVInvokedUrlCommand*)command { MWB_setParam([[command.arguments objectAtIndex:0] intValue], [[command.arguments objectAtIndex:1] intValue], [[command.arguments objectAtIndex:2] intValue]); } - (void)setActiveParser:(CDVInvokedUrlCommand*)command { [MWScannerViewController setActiveParser:[[command.arguments objectAtIndex:0] intValue]]; } - (void)resumeScanning:(CDVInvokedUrlCommand*)command { scannerViewController.state = CAMERA; } - (void)use60fps:(CDVInvokedUrlCommand*)command { [MWScannerViewController use60fps:[[command.arguments objectAtIndex:0] boolValue]];; } - (void)closeScanner:(CDVInvokedUrlCommand*)command { if ([self.viewController.view viewWithTag:9158436]) { [[self.viewController.view viewWithTag:9158436]removeFromSuperview]; [scannerViewController stopScanning]; previewLayer = nil; [[NSNotificationCenter defaultCenter] removeObserver:self name:@"DecoderResultNotification" object:nil]; [[NSNotificationCenter defaultCenter] removeObserver:self name:@"UIDeviceOrientationDidChangeNotification" object:nil]; scannerViewController = nil; } if (scannerViewController) { [scannerViewController dismissViewControllerAnimated:YES completion:nil]; } } - (void)togglePauseResume:(CDVInvokedUrlCommand*)command { if (scannerViewController.state != NORMAL) { scannerViewController.state = NORMAL; if ([MWScannerViewController getOverlayMode] == 1) { [MWOverlay setPaused:YES]; } }else{ scannerViewController.state = CAMERA; if ([MWScannerViewController getOverlayMode] == 1) { [MWOverlay setPaused:NO]; } } } - (void)scanImage:(CDVInvokedUrlCommand*)command { callbackId = command.callbackId; NSString *prefixToRemove = @"file://"; NSString *filePath = [command.arguments objectAtIndex:0]; if ([filePath hasPrefix:prefixToRemove]) filePath = [filePath substringFromIndex:[prefixToRemove length]]; UIImage * image = [UIImage imageWithContentsOfFile:filePath]; if (image!=nil) { int newWidth; int newHeight; uint8_t *bytes = [CDVMWBarcodeScanner UIImageToGrayscaleByteArray:image newWidth: &newWidth newHeight: &newHeight]; unsigned char *pResult=NULL; if (bytes) { int resLength = MWB_scanGrayscaleImage(bytes, newWidth, newHeight, &pResult); free(bytes); MWResults *mwResults = nil; MWResult *mwResult = nil; if (resLength > 0){ mwResults = [[MWResults alloc] initWithBuffer:pResult]; if (mwResults && mwResults.count > 0){ mwResult = [mwResults resultAtIntex:0]; } free(pResult); } if (mwResult) { [self scanningFinished:mwResult.text withType: mwResult.typeName isGS1:mwResult.isGS1 andRawResult: [[NSData alloc] initWithBytes: mwResult.bytes length: mwResult.bytesLength] locationPoints:mwResult.locationPoints imageWidth:mwResult.imageWidth imageHeight:mwResult.imageHeight]; }else{ [self scanningFinished:@"" withType: @"NoResult" isGS1:NO andRawResult: nil locationPoints:nil imageWidth:0 imageHeight:0]; } } } } #define MAX_IMAGE_SIZE 1280 + (unsigned char*)UIImageToGrayscaleByteArray:(UIImage*)image newWidth: (int*)newWidth newHeight: (int*)newHeight; { int targetWidth = image.size.width; int targetHeight = image.size.height; float scale = 1.0; if (targetWidth > MAX_IMAGE_SIZE || targetHeight > MAX_IMAGE_SIZE){ targetWidth /= 2; targetHeight /= 2; scale *= 2; } *newWidth = targetWidth; *newHeight = targetHeight; unsigned char *imageData = (unsigned char*)(malloc( targetWidth*targetHeight)); CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray(); CGImageRef imageRef = [image CGImage]; CGContextRef bitmap = CGBitmapContextCreate( imageData, targetWidth, targetHeight, 8, targetWidth, colorSpace, 0); CGContextDrawImage( bitmap, CGRectMake(0, 0, targetWidth, targetHeight), imageRef); CGContextRelease( bitmap); CGColorSpaceRelease( colorSpace); return imageData; } @end