#include "VolumeDataPreProcessor.h"


/// <summary>
/// 构造函数
/// </summary>
VolumeDataPreProcessor::VolumeDataPreProcessor()
{
	_queueSize = 1;
	_dataBuffer = nullptr;
	_origWidth = 0;
	_origHeight = 0;
	_origImgCount = 0;
	_dstWidth = 0;
	_dstHeight = 0;
	_depthFlag = CV_8UC1;
	_bytePerPixel = 1;
	_cropRect = cv::Rect(0,0,0,0);
	_origImgByteCount = 0;
}

/// <summary>
/// 构造函数
/// </summary>
/// <param name="size"></param>
VolumeDataPreProcessor::VolumeDataPreProcessor(int size, VolumeDataPreProcessorInfo dataInfo)
{
	// 读出输入
	_queueSize = size;
	_dataBuffer = dataInfo.dataBuffer;
	_origWidth = dataInfo.origImgWidth;
	_origHeight = dataInfo.origImgHeight;
	_origImgCount = dataInfo.origImgCount;
	ColorType colorType = dataInfo.colorType;
	Rect cropRect = dataInfo.cropRect;
	_dstWidth = dataInfo.desiredImgWidth;
	_dstHeight = dataInfo.desiredImgHeight;
	// 求出所需的中间变量
	_depthFlag = ImageHelper::GetDepthFlag(colorType);
	_bytePerPixel = ImageHelper::GetBytesPerPixel(colorType);
	_cropRect = cv::Rect(cropRect.left, cropRect.top, cropRect.width, cropRect.height);
	// 计算图像尺寸和一幅图的指针偏移量
	int imgSize = _origWidth * _origHeight;
	int bytesPerPixel = ImageHelper::GetBytesPerPixel(colorType);
	_origImgByteCount = imgSize * bytesPerPixel;
}

/// <summary>
/// 析构函数
/// </summary>
VolumeDataPreProcessor::~VolumeDataPreProcessor()
{
	while(!_imageIndex.empty())
	{
		RemoveTopMostImage();
	}
}

/// <summary>
/// 添加一幅图
/// </summary>
/// <param name="index"></param>
/// <param name="image"></param>
void VolumeDataPreProcessor::AddImage(int index, cv::Mat image)
{
	auto found = _images.find(index);
	if(found == _images.end())
	{
		_imageIndex.push(index);
		_images.insert(std::map<int,cv::Mat>::value_type(index, image));
		if(_queueSize < _imageIndex.size())
		{
			RemoveTopMostImage();
		}
	}
	else
	{
		found->second = image;
	}
}

/// <summary>
/// 容器内是否有指定index的图像
/// </summary>
/// <param name="index"></param>
/// <returns></returns>
bool VolumeDataPreProcessor::Contains(int index)
{
	auto found = _images.find(index);
	return found != _images.end();
}

/// <summary>
/// 取得一幅图
/// </summary>
/// <param name="index"></param>
/// <returns></returns>
cv::Mat VolumeDataPreProcessor::GetImage(int index)
{
	if(index <0 || index>= _origImgCount)
	{
		char strMsgBuff[32];
		std::snprintf(strMsgBuff, 32, "unexpected image index ( %i ) for a volume data with ( %i ) images .", index, _origImgCount);
		throw std::invalid_argument(strMsgBuff);
	}
	if(!Contains(index))
	{
		// 取出感兴趣的帧
		void* pImgData = (void*)(_dataBuffer + _origImgByteCount * index);
		cv::Mat imgOrig = cv::Mat(cv::Size(_origWidth, _origHeight), _depthFlag, pImgData);
		imgOrig = cv::Mat(imgOrig, _cropRect);
		cv::Mat imgCrop = cv::Mat(cv::Size(_cropRect.width, _cropRect.height), _depthFlag);
		imgOrig.copyTo(imgCrop);
		imgOrig.release();
		cv::resize(imgCrop, imgCrop, cv::Size(_dstWidth, _dstHeight));
		AddImage(index, imgCrop);
	}
	return _images[index];
}

/// <summary>
/// 移除最顶部的图像
/// </summary>
void VolumeDataPreProcessor::RemoveTopMostImage()
{
	int index = _imageIndex.front();
	_imageIndex.pop();
	_images[index].release();
	_images.erase(index);
}