/*
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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 "ZXBoolArray.h"
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#import "ZXEncodeHints.h"
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#import "ZXOneDimensionalCodeWriter.h"
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@implementation ZXOneDimensionalCodeWriter
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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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/**
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* Encode the contents following specified format.
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* width and height are required size. This method may return bigger size
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* ZXBitMatrix when specified size is too small. The user can set both {width and
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* height to zero to get minimum size barcode. If negative value is set to width
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* or height, IllegalArgumentException is thrown.
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*/
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- (ZXBitMatrix *)encode:(NSString *)contents format:(ZXBarcodeFormat)format width:(int)width height:(int)height
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hints:(ZXEncodeHints *)hints error:(NSError **)error {
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if (contents.length == 0) {
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@throw [NSException exceptionWithName:NSInvalidArgumentException reason:@"Found empty contents" userInfo:nil];
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}
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if (width < 0 || height < 0) {
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@throw [NSException exceptionWithName:NSInvalidArgumentException
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reason:[NSString stringWithFormat:@"Negative size is not allowed. Input: %dx%d", width, height]
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userInfo:nil];
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}
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int sidesMargin = [self defaultMargin];
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if (hints && hints.margin) {
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sidesMargin = hints.margin.intValue;
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}
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ZXBoolArray *code = [self encode:contents];
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return [self renderResult:code width:width height:height sidesMargin:sidesMargin];
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}
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/**
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* @return a byte array of horizontal pixels (0 = white, 1 = black)
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*/
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- (ZXBitMatrix *)renderResult:(ZXBoolArray *)code width:(int)width height:(int)height sidesMargin:(int)sidesMargin {
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int inputWidth = code.length;
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// Add quiet zone on both sides.
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int fullWidth = inputWidth + sidesMargin;
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int outputWidth = MAX(width, fullWidth);
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int outputHeight = MAX(1, height);
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int multiple = outputWidth / fullWidth;
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int leftPadding = (outputWidth - (inputWidth * multiple)) / 2;
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ZXBitMatrix *output = [[ZXBitMatrix alloc] initWithWidth:outputWidth height:outputHeight];
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for (int inputX = 0, outputX = leftPadding; inputX < inputWidth; inputX++, outputX += multiple) {
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if (code.array[inputX]) {
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[output setRegionAtLeft:outputX top:0 width:multiple height:outputHeight];
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}
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}
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return output;
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}
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/**
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* Appends the given pattern to the target array starting at pos.
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*
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* @param startColor starting color - false for white, true for black
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* @return the number of elements added to target.
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*/
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- (int)appendPattern:(ZXBoolArray *)target pos:(int)pos pattern:(const int[])pattern patternLen:(int)patternLen startColor:(BOOL)startColor {
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BOOL color = startColor;
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int numAdded = 0;
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for (int i = 0; i < patternLen; i++) {
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for (int j = 0; j < pattern[i]; j++) {
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target.array[pos++] = color;
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}
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numAdded += pattern[i];
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color = !color; // flip color after each segment
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}
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return numAdded;
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}
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- (int)defaultMargin {
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// CodaBar spec requires a side margin to be more than ten times wider than narrow space.
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// This seems like a decent idea for a default for all formats.
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return 10;
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}
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/**
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* Encode the contents to boolean array expression of one-dimensional barcode.
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* Start code and end code should be included in result, and side margins should not be included.
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*
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* @return a ZXBoolArray of horizontal pixels (false = white, true = black)
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*/
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- (ZXBoolArray *)encode:(NSString *)contents {
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@throw [NSException exceptionWithName:NSInternalInconsistencyException
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reason:[NSString stringWithFormat:@"You must override %@ in a subclass", NSStringFromSelector(_cmd)]
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userInfo:nil];
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}
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@end
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