GenericLuminanceSource.h

#pragma once
/*
* Copyright 2016 Nu-book Inc.
* Copyright 2016 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

#include "LuminanceSource.h"

namespace ZXing {

/**
* This decode images from an address in memory as RGB or ARGB data.
*/
class GenericLuminanceSource : public LuminanceSource
{
public:
	/**
	* Init with a RGB source.
	*/
	GenericLuminanceSource(int width, int height, const void* bytes, int rowBytes, int pixelBytes, int redIndex, int greenIndex, int blueIndex) :
		GenericLuminanceSource(0, 0, width, height, bytes, rowBytes, pixelBytes, redIndex, greenIndex, blueIndex) {}

	/**
	* Init with a RGB source, left, top, with, height specify the subregion area in orignal image; 'bytes' should still point the begining of image buffer (i.e. pixel (0,0)).
	*/
	GenericLuminanceSource(int left, int top, int width, int height, const void* bytes, int rowBytes, int pixelBytes, int redIndex, int greenIndex, int blueIndex);

	/**
	* Init with a grayscale source.
	*/
	GenericLuminanceSource(int width, int height, const void* bytes, int rowBytes) :
		GenericLuminanceSource(0, 0, width, height, bytes, rowBytes) {}

	/**
	* Init with a grayscale source, left, top, with, height specify the subregion area in orignal image; 'bytes' should still point the begining of image buffer (i.e. pixel (0,0)).
	*/
	GenericLuminanceSource(int left, int top, int width, int height, const void* bytes, int rowBytes);


	/**
	* Init with a grayscale source, left, top, with, height specify the subregion area in orignal image; 'bytes' should still point the begining of image buffer (i.e. pixel (0,0)).
	*/
	GenericLuminanceSource(int left, int top, int width, int height, std::shared_ptr<const ByteArray> pixels, int rowBytes);

	virtual int width() const override;
	virtual int height() const override;
	virtual const uint8_t* getRow(int y, ByteArray& buffer, bool forceCopy = false) const override;
	virtual const uint8_t* getMatrix(ByteArray& buffer, int& outRowBytes, bool forceCopy = false) const override;
	virtual bool canCrop() const override;
	virtual std::shared_ptr<LuminanceSource> cropped(int left, int top, int width, int height) const override;
	virtual bool canRotate() const override;
	virtual std::shared_ptr<LuminanceSource> rotated(int degreeCW) const override;

private:
	std::shared_ptr<const ByteArray> _pixels;
	int _left;
	int _top;
	int _width;
	int _height;
	int _rowBytes;
};

} // ZXing