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82 lines
2.8 KiB
C++
82 lines
2.8 KiB
C++
// -*- mode:c++; tab-width:2; indent-tabs-mode:nil; c-basic-offset:2 -*-
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/*
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* GreyscaleRotatedLuminanceSource.cpp
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* zxing
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*
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* Copyright 2010 ZXing authors All rights reserved.
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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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#include <zxing/common/GreyscaleRotatedLuminanceSource.h>
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#include <zxing/common/IllegalArgumentException.h>
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using zxing::ArrayRef;
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using zxing::GreyscaleRotatedLuminanceSource;
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// Note that dataWidth and dataHeight are not reversed, as we need to
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// be able to traverse the greyData correctly, which does not get
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// rotated.
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GreyscaleRotatedLuminanceSource::
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GreyscaleRotatedLuminanceSource(ArrayRef<char> greyData,
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int dataWidth, int dataHeight,
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int left, int top,
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int width, int height)
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: Super(width, height),
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greyData_(greyData),
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dataWidth_(dataWidth),
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left_(left), top_(top) {
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// Intentionally comparing to the opposite dimension since we're rotated.
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if (left + width > dataHeight || top + height > dataWidth) {
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throw IllegalArgumentException("Crop rectangle does not fit within image data.");
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}
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}
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// The API asks for rows, but we're rotated, so we return columns.
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ArrayRef<char>
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GreyscaleRotatedLuminanceSource::getRow(int y, ArrayRef<char> row) const {
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if (y < 0 || y >= getHeight()) {
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throw IllegalArgumentException("Requested row is outside the image.");
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}
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if (!row || row->size() < getWidth()) {
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row = ArrayRef<char>(getWidth());
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}
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int offset = (left_ * dataWidth_) + (dataWidth_ - 1 - (y + top_));
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using namespace std;
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if (false) {
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cerr << offset << " = "
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<< top_ << " " << left_ << " "
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<< getHeight() << " " << getWidth() << " "
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<< y << endl;
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}
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for (int x = 0; x < getWidth(); x++) {
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row[x] = greyData_[offset];
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offset += dataWidth_;
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}
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return row;
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}
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ArrayRef<char> GreyscaleRotatedLuminanceSource::getMatrix() const {
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ArrayRef<char> result (getWidth() * getHeight());
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for (int y = 0; y < getHeight(); y++) {
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char* row = &result[y * getWidth()];
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int offset = (left_ * dataWidth_) + (dataWidth_ - 1 - (y + top_));
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for (int x = 0; x < getWidth(); x++) {
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row[x] = greyData_[offset];
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offset += dataWidth_;
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}
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}
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return result;
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}
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