/*
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* Copyright 2012 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#import "ZXBitMatrix.h"
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#import "ZXByteMatrix.h"
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#import "ZXEncodeHints.h"
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#import "ZXQRCode.h"
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#import "ZXQRCodeEncoder.h"
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#import "ZXQRCodeErrorCorrectionLevel.h"
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#import "ZXQRCodeWriter.h"
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const int ZX_QUIET_ZONE_SIZE = 4;
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@implementation ZXQRCodeWriter
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- (ZXBitMatrix *)encode:(NSString *)contents format:(ZXBarcodeFormat)format width:(int)width height:(int)height error:(NSError **)error {
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return [self encode:contents format:format width:width height:height hints:nil error:error];
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}
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- (ZXBitMatrix *)encode:(NSString *)contents format:(ZXBarcodeFormat)format width:(int)width height:(int)height hints:(ZXEncodeHints *)hints error:(NSError **)error {
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if ([contents length] == 0) {
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[NSException raise:NSInvalidArgumentException format:@"Found empty contents"];
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}
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if (format != kBarcodeFormatQRCode) {
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[NSException raise:NSInvalidArgumentException format:@"Can only encode QR_CODE"];
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}
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if (width < 0 || height < 0) {
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[NSException raise:NSInvalidArgumentException format:@"Requested dimensions are too small: %dx%d", width, height];
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}
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ZXQRCodeErrorCorrectionLevel *errorCorrectionLevel = [ZXQRCodeErrorCorrectionLevel errorCorrectionLevelL];
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int quietZone = ZX_QUIET_ZONE_SIZE;
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if (hints != nil) {
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if (hints.errorCorrectionLevel) {
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errorCorrectionLevel = hints.errorCorrectionLevel;
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}
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if (hints.margin) {
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quietZone = [hints.margin intValue];
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}
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}
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ZXQRCode *code = [ZXQRCodeEncoder encode:contents ecLevel:errorCorrectionLevel hints:hints error:error];
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return [self renderResult:code width:width height:height quietZone:quietZone];
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}
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- (ZXBitMatrix *)renderResult:(ZXQRCode *)code width:(int)width height:(int)height quietZone:(int)quietZone {
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ZXByteMatrix *input = code.matrix;
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if (input == nil) {
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return nil;
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}
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int inputWidth = input.width;
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int inputHeight = input.height;
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int qrWidth = inputWidth + (quietZone * 2);
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int qrHeight = inputHeight + (quietZone * 2);
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int outputWidth = MAX(width, qrWidth);
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int outputHeight = MAX(height, qrHeight);
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int multiple = MIN(outputWidth / qrWidth, outputHeight / qrHeight);
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// Padding includes both the quiet zone and the extra white pixels to accommodate the requested
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// dimensions. For example, if input is 25x25 the QR will be 33x33 including the quiet zone.
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// If the requested size is 200x160, the multiple will be 4, for a QR of 132x132. These will
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// handle all the padding from 100x100 (the actual QR) up to 200x160.
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int leftPadding = (outputWidth - (inputWidth * multiple)) / 2;
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int topPadding = (outputHeight - (inputHeight * multiple)) / 2;
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ZXBitMatrix *output = [[ZXBitMatrix alloc] initWithWidth:outputWidth height:outputHeight];
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for (int inputY = 0, outputY = topPadding; inputY < inputHeight; inputY++, outputY += multiple) {
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for (int inputX = 0, outputX = leftPadding; inputX < inputWidth; inputX++, outputX += multiple) {
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if ([input getX:inputX y:inputY] == 1) {
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[output setRegionAtLeft:outputX top:outputY width:multiple height:multiple];
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}
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}
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}
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return output;
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}
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@end
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