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66 lines
2.3 KiB
C++
66 lines
2.3 KiB
C++
/*
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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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namespace zxing {
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// Note that dataWidth and dataHeight are not reversed, as we need to be able to traverse the
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// greyData correctly, which does not get rotated.
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GreyscaleRotatedLuminanceSource::GreyscaleRotatedLuminanceSource(unsigned char* greyData,
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int dataWidth, int dataHeight, int left, int top, int width, int height) : greyData_(greyData),
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dataWidth_(dataWidth), dataHeight_(dataHeight), left_(left), top_(top), width_(width),
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height_(height) {
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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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unsigned char* GreyscaleRotatedLuminanceSource::getRow(int y, unsigned char* row) {
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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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int width = getWidth();
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if (row == NULL) {
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row = new unsigned char[width];
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}
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int offset = (left_ * dataWidth_) + (dataWidth_ - (y + top_));
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for (int x = 0; x < width; 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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unsigned char* GreyscaleRotatedLuminanceSource::getMatrix() {
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unsigned char* result = new unsigned char[width_ * height_];
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// This depends on getRow() honoring its second parameter.
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for (int y = 0; y < height_; y++) {
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getRow(y, &result[y * width_]);
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}
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return result;
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}
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} // namespace
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