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90 lines
2.9 KiB
90 lines
2.9 KiB
1 year ago
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//
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// QR Code Generator - generates UIImage from NSString
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//
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// Copyright (C) 2012 http://moqod.com Andrew Kopanev <andrew@moqod.com>
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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// of the Software, and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#import "QRCodeGenerator.h"
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#import "qrencode.h"
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enum {
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qr_margin = 3
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};
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@implementation QRCodeGenerator
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+ (void)drawQRCode:(QRcode *)code context:(CGContextRef)ctx size:(CGFloat)size {
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unsigned char *data = 0;
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int width;
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data = code->data;
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width = code->width;
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float zoom = (double)size / (code->width + 2.0 * qr_margin);
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CGRect rectDraw = CGRectMake(0, 0, zoom, zoom);
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// draw
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CGContextSetFillColor(ctx, CGColorGetComponents([UIColor blackColor].CGColor));
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for(int i = 0; i < width; ++i) {
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for(int j = 0; j < width; ++j) {
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if(*data & 1) {
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rectDraw.origin = CGPointMake((j + qr_margin) * zoom,(i + qr_margin) * zoom);
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CGContextAddRect(ctx, rectDraw);
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}
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++data;
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}
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}
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CGContextFillPath(ctx);
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}
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+ (UIImage *)qrImageForString:(NSString *)string imageSize:(CGFloat)size {
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if (![string length]) {
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return nil;
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}
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QRcode *code = QRcode_encodeString([string UTF8String], 0, QR_ECLEVEL_L, QR_MODE_8, 1);
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if (!code) {
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return nil;
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}
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// create context
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CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
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CGContextRef ctx = CGBitmapContextCreate(0, size, size, 8, size * 4, colorSpace, kCGImageAlphaPremultipliedLast);
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CGAffineTransform translateTransform = CGAffineTransformMakeTranslation(0, -size);
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CGAffineTransform scaleTransform = CGAffineTransformMakeScale(1, -1);
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CGContextConcatCTM(ctx, CGAffineTransformConcat(translateTransform, scaleTransform));
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// draw QR on this context
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[QRCodeGenerator drawQRCode:code context:ctx size:size];
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// get image
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CGImageRef qrCGImage = CGBitmapContextCreateImage(ctx);
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UIImage * qrImage = [UIImage imageWithCGImage:qrCGImage];
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// some releases
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CGContextRelease(ctx);
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CGImageRelease(qrCGImage);
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CGColorSpaceRelease(colorSpace);
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QRcode_free(code);
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return qrImage;
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}
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@end
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