/*
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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 "ZXDefaultGridSampler.h"
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#import "ZXErrors.h"
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#import "ZXGridSampler.h"
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#import "ZXPerspectiveTransform.h"
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static ZXGridSampler *gridSampler = nil;
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@implementation ZXGridSampler
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+ (void)setGridSampler:(ZXGridSampler *)newGridSampler {
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gridSampler = newGridSampler;
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}
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+ (ZXGridSampler *)instance {
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if (!gridSampler) {
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gridSampler = [[ZXDefaultGridSampler alloc] init];
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}
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return gridSampler;
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}
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- (ZXBitMatrix *)sampleGrid:(ZXBitMatrix *)image
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dimensionX:(int)dimensionX
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dimensionY:(int)dimensionY
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p1ToX:(float)p1ToX p1ToY:(float)p1ToY
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p2ToX:(float)p2ToX p2ToY:(float)p2ToY
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p3ToX:(float)p3ToX p3ToY:(float)p3ToY
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p4ToX:(float)p4ToX p4ToY:(float)p4ToY
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p1FromX:(float)p1FromX p1FromY:(float)p1FromY
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p2FromX:(float)p2FromX p2FromY:(float)p2FromY
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p3FromX:(float)p3FromX p3FromY:(float)p3FromY
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p4FromX:(float)p4FromX p4FromY:(float)p4FromY
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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 *)sampleGrid:(ZXBitMatrix *)image
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dimensionX:(int)dimensionX
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dimensionY:(int)dimensionY
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transform:(ZXPerspectiveTransform *)transform
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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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+ (BOOL)checkAndNudgePoints:(ZXBitMatrix *)image points:(float *)points pointsLen:(int)pointsLen error:(NSError **)error {
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int width = image.width;
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int height = image.height;
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// Check and nudge points from start until we see some that are OK:
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BOOL nudged = YES;
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for (int offset = 0; offset < pointsLen && nudged; offset += 2) {
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int x = (int) points[offset];
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int y = (int) points[offset + 1];
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if (x < -1 || x > width || y < -1 || y > height) {
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if (error) *error = ZXNotFoundErrorInstance();
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return NO;
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}
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nudged = NO;
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if (x == -1) {
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points[offset] = 0.0f;
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nudged = YES;
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} else if (x == width) {
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points[offset] = width - 1;
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nudged = YES;
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}
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if (y == -1) {
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points[offset + 1] = 0.0f;
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nudged = YES;
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} else if (y == height) {
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points[offset + 1] = height - 1;
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nudged = YES;
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}
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}
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// Check and nudge points from end:
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nudged = YES;
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for (int offset = pointsLen - 2; offset >= 0 && nudged; offset -= 2) {
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int x = (int) points[offset];
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int y = (int) points[offset + 1];
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if (x < -1 || x > width || y < -1 || y > height) {
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if (error) *error = ZXNotFoundErrorInstance();
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return NO;
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}
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nudged = NO;
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if (x == -1) {
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points[offset] = 0.0f;
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nudged = YES;
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} else if (x == width) {
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points[offset] = width - 1;
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nudged = YES;
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}
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if (y == -1) {
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points[offset + 1] = 0.0f;
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nudged = YES;
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} else if (y == height) {
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points[offset + 1] = height - 1;
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nudged = YES;
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}
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}
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return YES;
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}
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@end
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