win32 stinks

Screenshot.cpp

#include "Screenshot.hpp"

Screenshot::Screenshot(int x, int y, int w, int h) : x(x), y(y), width(w), height(h)
{
	HBITMAP hBitmap;
	hdcSys = GetDC(NULL);
	hdcMem = CreateCompatibleDC(hdcSys);

	void *ptrBitmapPixels;

	BITMAPINFO bi; HDC hdc;
	ZeroMemory(&bi, sizeof(BITMAPINFO));
	bi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
	bi.bmiHeader.biWidth = getWidth();
	bi.bmiHeader.biHeight = -getHeight();
	bi.bmiHeader.biPlanes = 1;
	bi.bmiHeader.biBitCount = 32;
	hdc = GetDC(NULL);
	hBitmap = CreateDIBSection(hdc, &bi, DIB_RGB_COLORS, &ptrBitmapPixels, NULL, 0);

	SelectObject(hdcMem, hBitmap);

	this->mat = cv::Mat(getHeight(), getWidth(), CV_8UC4, ptrBitmapPixels, 0);
}

Screenshot::~Screenshot()
{
	// TODO: dtor()
}

cv::Mat Screenshot::getMat()
{
	BitBlt(hdcMem, this->getX(), this->getY(), this->getWidth(), this->getHeight(), hdcSys, 0, 0, SRCCOPY);

	return this->mat;
}

Screenshot.hpp

#pragma once

#include <opencv2/core.hpp>
#include <Windows.h>

class Screenshot {
private:
	HDC hdcSys, hdcMem;
	int x, y, width, height;
	cv::Mat mat;
public:
	Screenshot(int x, int y, int w, int h);
	~Screenshot();
	inline int getX() { return x; }
	inline int getY() { return y; }
	inline int getWidth() { return width; }
	inline int getHeight() { return height; }
	cv::Mat getMat();
};