/*
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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 "ZXByteArray.h"
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#import "ZXPlanarYUVLuminanceSource.h"
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const int THUMBNAIL_SCALE_FACTOR = 2;
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@interface ZXPlanarYUVLuminanceSource ()
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@property (nonatomic, strong, readonly) ZXByteArray *yuvData;
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@property (nonatomic, assign, readonly) int dataWidth;
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@property (nonatomic, assign, readonly) int dataHeight;
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@property (nonatomic, assign, readonly) int left;
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@property (nonatomic, assign, readonly) int top;
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@end
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@implementation ZXPlanarYUVLuminanceSource
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- (id)initWithYuvData:(int8_t *)yuvData yuvDataLen:(int)yuvDataLen dataWidth:(int)dataWidth
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dataHeight:(int)dataHeight left:(int)left top:(int)top width:(int)width height:(int)height
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reverseHorizontal:(BOOL)reverseHorizontal {
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if (self = [super initWithWidth:width height:height]) {
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if (left + width > dataWidth || top + height > dataHeight) {
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[NSException raise:NSInvalidArgumentException format:@"Crop rectangle does not fit within image data."];
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}
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_yuvData = [[ZXByteArray alloc] initWithLength:yuvDataLen];
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memcpy(_yuvData.array, yuvData, yuvDataLen * sizeof(int8_t));
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_dataWidth = dataWidth;
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_dataHeight = dataHeight;
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_left = left;
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_top = top;
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if (reverseHorizontal) {
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[self reverseHorizontal:width height:height];
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}
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}
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return self;
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}
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- (ZXByteArray *)rowAtY:(int)y row:(ZXByteArray *)row {
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if (y < 0 || y >= self.height) {
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[NSException raise:NSInvalidArgumentException
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format:@"Requested row is outside the image: %d", y];
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}
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int width = self.width;
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if (!row || row.length < width) {
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row = [[ZXByteArray alloc] initWithLength:width];
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}
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int offset = (y + self.top) * self.dataWidth + self.left;
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memcpy(row.array, self.yuvData.array + offset, self.width * sizeof(int8_t));
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return row;
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}
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- (ZXByteArray *)matrix {
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int width = self.width;
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int height = self.height;
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// If the caller asks for the entire underlying image, save the copy and give them the
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// original data. The docs specifically warn that result.length must be ignored.
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if (width == self.dataWidth && height == self.dataHeight) {
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return self.yuvData;
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}
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int area = self.width * self.height;
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ZXByteArray *matrix = [[ZXByteArray alloc] initWithLength:area];
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int inputOffset = self.top * self.dataWidth + self.left;
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// If the width matches the full width of the underlying data, perform a single copy.
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if (self.width == self.dataWidth) {
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memcpy(matrix.array, self.yuvData.array + inputOffset, (area - inputOffset) * sizeof(int8_t));
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return matrix;
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}
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// Otherwise copy one cropped row at a time.
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ZXByteArray *yuvData = self.yuvData;
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for (int y = 0; y < self.height; y++) {
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int outputOffset = y * self.width;
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memcpy(matrix.array + outputOffset, yuvData.array + inputOffset, self.width * sizeof(int8_t));
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inputOffset += self.dataWidth;
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}
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return matrix;
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}
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- (BOOL)cropSupported {
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return YES;
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}
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- (ZXLuminanceSource *)crop:(int)left top:(int)top width:(int)width height:(int)height {
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return [[[self class] alloc] initWithYuvData:self.yuvData.array yuvDataLen:self.yuvData.length dataWidth:self.dataWidth
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dataHeight:self.dataHeight left:self.left + left top:self.top + top
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width:width height:height reverseHorizontal:NO];
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}
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- (int *)renderThumbnail {
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int thumbWidth = self.width / THUMBNAIL_SCALE_FACTOR;
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int thumbHeight = self.height / THUMBNAIL_SCALE_FACTOR;
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int *pixels = (int *)malloc(thumbWidth * thumbHeight * sizeof(int));
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int inputOffset = self.top * self.dataWidth + self.left;
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for (int y = 0; y < self.height; y++) {
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int outputOffset = y * self.width;
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for (int x = 0; x < self.width; x++) {
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int grey = self.yuvData.array[inputOffset + x * THUMBNAIL_SCALE_FACTOR] & 0xff;
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pixels[outputOffset + x] = 0xFF000000 | (grey * 0x00010101);
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}
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inputOffset += self.dataWidth * THUMBNAIL_SCALE_FACTOR;
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}
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return pixels;
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}
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- (int)thumbnailWidth {
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return self.width / THUMBNAIL_SCALE_FACTOR;
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}
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- (int)thumbnailHeight {
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return self.height / THUMBNAIL_SCALE_FACTOR;
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}
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- (void)reverseHorizontal:(int)width height:(int)height {
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for (int y = 0, rowStart = self.top * self.dataWidth + self.left; y < height; y++, rowStart += self.dataWidth) {
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int middle = rowStart + width / 2;
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for (int x1 = rowStart, x2 = rowStart + width - 1; x1 < middle; x1++, x2--) {
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int8_t temp = self.yuvData.array[x1];
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self.yuvData.array[x1] = self.yuvData.array[x2];
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self.yuvData.array[x2] = temp;
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}
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}
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}
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@end
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