C++ D2D位图转化为Mat
时间: 2024-05-08 16:21:07 浏览: 264
在Windows下,可以使用Direct2D来创建位图,OpenCV中的Mat是一个矩阵类,可以表示图像。我们可以通过将Direct2D位图转换为GDI+位图,然后使用OpenCV的imread函数将其读入Mat中。
以下是一个示例代码:
```c++
#include <d2d1.h>
#include <gdiplus.h>
#include <opencv2/opencv.hpp>
#pragma comment(lib, "d2d1.lib")
#pragma comment(lib, "gdiplus.lib")
using namespace Gdiplus;
int main()
{
// Initialize Direct2D
HRESULT hr = CoInitialize(NULL);
ID2D1Factory* pFactory = NULL;
hr = D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, &pFactory);
// Create a Direct2D bitmap
ID2D1Bitmap* pBitmap = NULL;
D2D1_SIZE_U size = D2D1::SizeU(640, 480);
hr = pFactory->CreateBitmap(size, D2D1::BitmapProperties(D2D1_PIXEL_FORMAT{ DXGI_FORMAT_R8G8B8A8_UNORM, D2D1_ALPHA_MODE_IGNORE }), &pBitmap);
// Draw something on the bitmap
ID2D1RenderTarget* pRenderTarget = NULL;
hr = pFactory->CreateWicBitmapRenderTarget(pBitmap, &D2D1::RenderTargetProperties(), &pRenderTarget);
pRenderTarget->BeginDraw();
pRenderTarget->Clear(D2D1::ColorF(D2D1::ColorF::White));
ID2D1SolidColorBrush* pBrush = NULL;
hr = pRenderTarget->CreateSolidColorBrush(D2D1::ColorF(D2D1::ColorF::Red), &pBrush);
pRenderTarget->DrawLine(D2D1::Point2F(0, 0), D2D1::Point2F(640, 480), pBrush);
pRenderTarget->DrawLine(D2D1::Point2F(0, 480), D2D1::Point2F(640, 0), pBrush);
hr = pRenderTarget->EndDraw();
// Convert Direct2D bitmap to GDI+ bitmap
IWICImagingFactory* pWICFactory = NULL;
hr = CoCreateInstance(CLSID_WICImagingFactory, NULL, CLSCTX_INPROC_SERVER, IID_IWICImagingFactory, (LPVOID*)&pWICFactory);
IWICBitmap* pWICBitmap = NULL;
hr = pRenderTarget->GetBitmap(&pWICBitmap);
IWICBitmapSource* pWICBitmapSource = NULL;
hr = pWICBitmap->QueryInterface(IID_IWICBitmapSource, (LPVOID*)&pWICBitmapSource);
Gdiplus::Bitmap* pGdiBitmap = new Gdiplus::Bitmap(pWICBitmapSource, NULL);
// Convert GDI+ bitmap to Mat
cv::Mat mat = cv::Mat(pGdiBitmap->GetHeight(), pGdiBitmap->GetWidth(), CV_8UC4, pGdiBitmap->GetPixelAddress(0, 0));
// Show the Mat
cv::imshow("Mat from Direct2D Bitmap", mat);
cv::waitKey();
// Clean up
delete pGdiBitmap;
pWICBitmapSource->Release();
pWICBitmap->Release();
pRenderTarget->Release();
pBrush->Release();
pBitmap->Release();
pFactory->Release();
CoUninitialize();
return 0;
}
```
在这个示例中,我们首先使用Direct2D创建了一个640x480的位图,并在其中绘制了两条对角线。接下来,我们将Direct2D位图转换为GDI+位图,并使用GDI+位图的像素地址创建了一个OpenCV的Mat对象。最后,我们将Mat对象显示在一个窗口中。
请注意,在将Direct2D位图转换为GDI+位图时,我们使用了Windows Imaging Component (WIC)。WIC是一个功能强大的图像处理库,可以用于在Windows中处理各种图像格式。
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