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81 lines
2.9 KiB
C++
81 lines
2.9 KiB
C++
// -*- mode:c++; tab-width:2; indent-tabs-mode:nil; c-basic-offset:2 -*-
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/*
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* GreyscaleLuminanceSource.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/GreyscaleLuminanceSource.h>
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#include <zxing/common/GreyscaleRotatedLuminanceSource.h>
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#include <zxing/common/IllegalArgumentException.h>
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using zxing::Ref;
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using zxing::ArrayRef;
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using zxing::LuminanceSource;
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using zxing::GreyscaleLuminanceSource;
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GreyscaleLuminanceSource::
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GreyscaleLuminanceSource(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), dataHeight_(dataHeight),
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left_(left), top_(top) {
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if (left + width > dataWidth || top + height > dataHeight || top < 0 || left < 0) {
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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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ArrayRef<char> GreyscaleLuminanceSource::getRow(int y, ArrayRef<char> row) const {
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if (y < 0 || y >= this->getHeight()) {
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throw IllegalArgumentException("Requested row is outside the image.");
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}
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int width = getWidth();
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if (!row || row->size() < width) {
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ArrayRef<char> temp (width);
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row = temp;
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}
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int offset = (y + top_) * dataWidth_ + left_;
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memcpy(&row[0], &greyData_[offset], width);
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return row;
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}
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ArrayRef<char> GreyscaleLuminanceSource::getMatrix() const {
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int size = getWidth() * getHeight();
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ArrayRef<char> result (size);
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if (left_ == 0 && top_ == 0 && dataWidth_ == getWidth() && dataHeight_ == getHeight()) {
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memcpy(&result[0], &greyData_[0], size);
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} else {
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for (int row = 0; row < getHeight(); row++) {
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memcpy(&result[row * getWidth()], &greyData_[(top_ + row) * dataWidth_ + left_], getWidth());
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}
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}
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return result;
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}
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Ref<LuminanceSource> GreyscaleLuminanceSource::rotateCounterClockwise() const {
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// Intentionally flip the left, top, width, and height arguments as
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// needed. dataWidth and dataHeight are always kept unrotated.
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Ref<LuminanceSource> result (
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new GreyscaleRotatedLuminanceSource(greyData_,
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dataWidth_, dataHeight_,
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top_, left_, getHeight(), getWidth()));
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return result;
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}
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