/*
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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 "ZXBinarizer.h"
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#if TARGET_OS_EMBEDDED || TARGET_IPHONE_SIMULATOR
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#import <UIKit/UIKit.h>
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#define ZXBlack [[UIColor blackColor] CGColor]
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#define ZXWhite [[UIColor whiteColor] CGColor]
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#else
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#define ZXBlack CGColorGetConstantColor(kCGColorBlack)
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#define ZXWhite CGColorGetConstantColor(kCGColorWhite)
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#endif
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@implementation ZXBinarizer
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- (id)initWithSource:(ZXLuminanceSource *)source {
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if (self = [super init]) {
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_luminanceSource = source;
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}
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return self;
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}
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- (id)initWithLuminanceSource:(ZXLuminanceSource *)source {
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return [self initWithSource:source];
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}
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+ (id)binarizerWithSource:(ZXLuminanceSource *)source {
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return [[self alloc] initWithLuminanceSource:source];
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}
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- (ZXBitArray *)blackRow:(int)y row:(ZXBitArray *)row error:(NSError **)error {
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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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- (ZXBitMatrix *)blackMatrixWithError:(NSError **)error {
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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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- (ZXBinarizer *)createBinarizer:(ZXLuminanceSource *)source {
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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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- (CGImageRef)createImage CF_RETURNS_RETAINED {
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ZXBitMatrix *matrix = [self blackMatrixWithError:nil];
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if (!matrix) {
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return nil;
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}
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ZXLuminanceSource *source = [self luminanceSource];
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int width = source.width;
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int height = source.height;
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int bytesPerRow = ((width&0xf)>>4)<<4;
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CGColorSpaceRef gray = CGColorSpaceCreateDeviceGray();
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CGContextRef context = CGBitmapContextCreate (
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0,
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width,
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height,
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8, // bits per component
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bytesPerRow,
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gray,
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kCGBitmapAlphaInfoMask & kCGImageAlphaNone);
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CGColorSpaceRelease(gray);
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CGRect r = CGRectZero;
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r.size.width = width;
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r.size.height = height;
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CGContextSetFillColorWithColor(context, ZXBlack);
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CGContextFillRect(context, r);
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r.size.width = 1;
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r.size.height = 1;
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CGContextSetFillColorWithColor(context, ZXWhite);
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for (int y=0; y<height; y++) {
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r.origin.y = height-1-y;
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for (int x=0; x<width; x++) {
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if (![matrix getX:x y:y]) {
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r.origin.x = x;
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CGContextFillRect(context, r);
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}
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}
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}
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CGImageRef binary = CGBitmapContextCreateImage(context);
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CGContextRelease(context);
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return binary;
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}
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- (int)width {
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return self.luminanceSource.width;
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}
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- (int)height {
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return self.luminanceSource.height;
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}
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@end
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