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Adds the ability to generate a QR with a custom image instead of boxes #8

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Adds the ability to generate a QR with a custom image instead of boxes #8

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6 changes: 6 additions & 0 deletions QRCode.xcodeproj/project.pbxproj
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@
objects = {

/* Begin PBXBuildFile section */
31693FC71F0939F8000F9231 /* redButton.png in Resources */ = {isa = PBXBuildFile; fileRef = 31693FC61F0939F8000F9231 /* redButton.png */; };
52DC9B6E188D65A300272042 /* Foundation.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 52DC9B6D188D65A300272042 /* Foundation.framework */; };
52DC9B70188D65A300272042 /* CoreGraphics.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 52DC9B6F188D65A300272042 /* CoreGraphics.framework */; };
52DC9B72188D65A300272042 /* UIKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 52DC9B71188D65A300272042 /* UIKit.framework */; };
Expand Down Expand Up @@ -43,6 +44,7 @@
/* End PBXContainerItemProxy section */

/* Begin PBXFileReference section */
31693FC61F0939F8000F9231 /* redButton.png */ = {isa = PBXFileReference; lastKnownFileType = image.png; path = redButton.png; sourceTree = "<group>"; };
52DC9B6A188D65A300272042 /* QRCode.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = QRCode.app; sourceTree = BUILT_PRODUCTS_DIR; };
52DC9B6D188D65A300272042 /* Foundation.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = Foundation.framework; path = System/Library/Frameworks/Foundation.framework; sourceTree = SDKROOT; };
52DC9B6F188D65A300272042 /* CoreGraphics.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = CoreGraphics.framework; path = System/Library/Frameworks/CoreGraphics.framework; sourceTree = SDKROOT; };
Expand Down Expand Up @@ -180,6 +182,7 @@
isa = PBXGroup;
children = (
52DC9B9D188D660C00272042 /* [email protected] */,
31693FC61F0939F8000F9231 /* redButton.png */,
52DC9B9E188D660C00272042 /* [email protected] */,
52DC9B9F188D660C00272042 /* Icon.png */,
);
Expand Down Expand Up @@ -298,6 +301,7 @@
52DC9BA2188D660C00272042 /* Icon.png in Resources */,
52DC9B80188D65A300272042 /* Images.xcassets in Resources */,
52DC9BA0188D660C00272042 /* [email protected] in Resources */,
31693FC71F0939F8000F9231 /* redButton.png in Resources */,
);
runOnlyForDeploymentPostprocessing = 0;
};
Expand Down Expand Up @@ -522,6 +526,7 @@
52DC9B98188D65A300272042 /* Release */,
);
defaultConfigurationIsVisible = 0;
defaultConfigurationName = Release;
};
52DC9B99188D65A300272042 /* Build configuration list for PBXNativeTarget "QRCodeTests" */ = {
isa = XCConfigurationList;
Expand All @@ -530,6 +535,7 @@
52DC9B9B188D65A300272042 /* Release */,
);
defaultConfigurationIsVisible = 0;
defaultConfigurationName = Release;
};
/* End XCConfigurationList section */
};
Expand Down
4 changes: 3 additions & 1 deletion QRCode/MDAppDelegate.m
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Expand Up @@ -35,7 +35,9 @@ - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(
CGFloat imageSize = ceilf(viewController.view.bounds.size.width * 0.6f);
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(floorf(viewController.view.bounds.size.width * 0.5f - imageSize * 0.5f), floorf(viewController.view.bounds.size.height * 0.5f - imageSize * 0.5f), imageSize, imageSize)];
[viewController.view addSubview:imageView];
imageView.image = [UIImage mdQRCodeForString:@"Hello, world!" size:imageView.bounds.size.width fillColor:[UIColor darkGrayColor]];
// imageView.image = [UIImage mdQRCodeForString:@"Hello, world!" size:imageView.bounds.size.width fillColor:[UIColor darkGrayColor]];
imageView.image = [UIImage mdQRCodeForString:@"Hello, world!" size:imageView.bounds.size.width fillImage:[UIImage imageNamed:@"redButton"]];

self.window.rootViewController = viewController;
return YES;
}
Expand Down
1 change: 1 addition & 0 deletions QRCode/QR/UIImage+MDQRCode.h
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Expand Up @@ -33,6 +33,7 @@
*/
+ (UIImage *)mdQRCodeForString:(NSString *)qrString size:(CGFloat)size;
+ (UIImage *)mdQRCodeForString:(NSString *)qrString size:(CGFloat)size fillColor:(UIColor *)fillColor;
+ (UIImage *)mdQRCodeForString:(NSString *)qrString size:(CGFloat)size fillImage:(UIImage *)fillImage;


@end
160 changes: 92 additions & 68 deletions QRCode/QR/UIImage+MDQRCode.m
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Expand Up @@ -28,82 +28,106 @@ @implementation UIImage (MDQRCode)

#pragma mark - private

+ (void)mdDrawQRCode:(QRcode *)code context:(CGContextRef)ctx size:(CGFloat)size fillColor:(UIColor *)fillColor {
int margin = 0;
unsigned char *data = code->data;
int width = code->width;
int totalWidth = width + margin * 2;
int imageSize = (int)floorf(size);

// @todo - review float->int stuff
int pixelSize = imageSize / totalWidth;
if (imageSize % totalWidth) {
pixelSize = imageSize / width;
margin = (imageSize - width * pixelSize) / 2;
}

CGRect rectDraw = CGRectMake(0.0f, 0.0f, pixelSize, pixelSize);
// draw
CGContextSetFillColorWithColor(ctx, fillColor.CGColor);
for(int i = 0; i < width; ++i) {
for(int j = 0; j < width; ++j) {
if(*data & 1) {
rectDraw.origin = CGPointMake(margin + j * pixelSize, margin + i * pixelSize);
CGContextAddRect(ctx, rectDraw);
}
++data;
}
}
CGContextFillPath(ctx);
+ (void)mdDrawQRCode:(QRcode *)code context:(CGContextRef)ctx size:(CGFloat)size fillImage:(UIImage *)fillImage orFillColor:(UIColor *)fillColor {
int margin = 0;
unsigned char *data = code->data;
int width = code->width;
int totalWidth = width + margin * 2;
int imageSize = (int)floorf(size);

// @todo - review float->int stuff
int pixelSize = imageSize / totalWidth;
if (imageSize % totalWidth) {
pixelSize = imageSize / width;
margin = (imageSize - width * pixelSize) / 2;
}

CGRect rectDraw = CGRectMake(0.0f, 0.0f, pixelSize, pixelSize);
// draw
if (fillColor) {
CGContextSetFillColorWithColor(ctx, fillColor.CGColor);
}

for(int i = 0; i < width; ++i) {
for(int j = 0; j < width; ++j) {
if(*data & 1) {
rectDraw.origin = CGPointMake(margin + j * pixelSize, margin + i * pixelSize);
if (fillColor) {
CGContextAddRect(ctx, rectDraw);
}else if (fillImage) {
UIGraphicsPushContext(ctx);
[fillImage drawInRect:rectDraw];
UIGraphicsPopContext();
}
}
++data;
}
}
CGContextFillPath(ctx);
}

+ (UIImage *)mdQRCodeForString:(NSString *)qrString size:(CGFloat)imageSize boxImage:(UIImage *)fillImage orFillColor:(UIColor *)fillColor{


if (0 == [qrString length]) {
return nil;
}

// generate QR
QRcode *code = QRcode_encodeString([qrString UTF8String], 0, QR_ECLEVEL_L, QR_MODE_8, 1);
if (!code) {
return nil;
}

CGFloat size = imageSize * [[UIScreen mainScreen] scale];
if (code->width > size) {
printf("Image size is less than qr code size (%d)\n", code->width);
return nil;
}

// create context
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

// The constants for specifying the alpha channel information are declared with the CGImageAlphaInfo type but can be passed to this parameter safely.

CGContextRef ctx = CGBitmapContextCreate(0, size, size, 8, size * 4, colorSpace, (CGBitmapInfo)kCGImageAlphaPremultipliedLast);

CGAffineTransform translateTransform = CGAffineTransformMakeTranslation(0, -size);
CGAffineTransform scaleTransform = CGAffineTransformMakeScale(1, -1);
CGContextConcatCTM(ctx, CGAffineTransformConcat(translateTransform, scaleTransform));

// draw QR on this context

[self mdDrawQRCode:code context:ctx size:size fillImage:fillImage orFillColor:fillColor];


// get image
CGImageRef qrCGImage = CGBitmapContextCreateImage(ctx);
UIImage * qrImage = [UIImage imageWithCGImage:qrCGImage];

// free memory
CGContextRelease(ctx);
CGImageRelease(qrCGImage);
CGColorSpaceRelease(colorSpace);
QRcode_free(code);
return qrImage;

}

#pragma mark - public


+ (UIImage *)mdQRCodeForString:(NSString *)qrString size:(CGFloat)size {
return [self mdQRCodeForString:qrString size:size fillColor:[UIColor blackColor]];
return [self mdQRCodeForString:qrString size:size fillColor:[UIColor blackColor]];
}

+ (UIImage *)mdQRCodeForString:(NSString *)qrString size:(CGFloat)imageSize fillColor:(UIColor *)fillColor {
if (0 == [qrString length]) {
return nil;
}

// generate QR
QRcode *code = QRcode_encodeString([qrString UTF8String], 0, QR_ECLEVEL_L, QR_MODE_8, 1);
if (!code) {
return nil;
}

CGFloat size = imageSize * [[UIScreen mainScreen] scale];
if (code->width > size) {
printf("Image size is less than qr code size (%d)\n", code->width);
return nil;
}

// create context
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

// The constants for specifying the alpha channel information are declared with the CGImageAlphaInfo type but can be passed to this parameter safely.

CGContextRef ctx = CGBitmapContextCreate(0, size, size, 8, size * 4, colorSpace, (CGBitmapInfo)kCGImageAlphaPremultipliedLast);

CGAffineTransform translateTransform = CGAffineTransformMakeTranslation(0, -size);
CGAffineTransform scaleTransform = CGAffineTransformMakeScale(1, -1);
CGContextConcatCTM(ctx, CGAffineTransformConcat(translateTransform, scaleTransform));

// draw QR on this context
[self mdDrawQRCode:code context:ctx size:size fillColor:fillColor];

// get image
CGImageRef qrCGImage = CGBitmapContextCreateImage(ctx);
UIImage * qrImage = [UIImage imageWithCGImage:qrCGImage];

// free memory
CGContextRelease(ctx);
CGImageRelease(qrCGImage);
CGColorSpaceRelease(colorSpace);
QRcode_free(code);
return qrImage;
return [self mdQRCodeForString:qrString size:imageSize boxImage:nil orFillColor:fillColor];

}
+ (UIImage *)mdQRCodeForString:(NSString *)qrString size:(CGFloat)imageSize fillImage:(UIImage *)fillImage{
return [self mdQRCodeForString:qrString size:imageSize boxImage:fillImage orFillColor:nil];
}


@end
Binary file added Resources/redButton.png
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