c++win32directx2d绘制png图片

在Win32上使用DirectX 2D绘制PNG图片，通常涉及到以下步骤：

1. **初始化Direct2D上下文**[^1]：

   ID2D1Factory* factory;
   CreateDeviceContext(D2D1_FACTORY_TYPE_SINGLE_THREADED, &factory);
   ID2D1DeviceContext* deviceContext;
   factory->CreateDeviceContext(D2D1_CONTEXT_TYPE_DEFAULT, &deviceContext);

2. **加载和准备图像资源**：

   ID2D1Bitmap* bitmap;
   LoadBitmapFromWic(deviceContext, L"image.png", &bitmap); // 假设image.png是PNG文件路径
   D2D1_BITMAP_PROPERTIES props = { D2D1_BITMAP_OPTIONS_TARGET | D2D1_BITMAP_OPTIONS_CANNOT_DRAW };
   bitmap->SetProperties(props);

3. **创建绘图表面**：

   D2D1_SIZE_U size = bitmap->GetSize();
   ID2D1HwndRenderTarget* renderTarget;
   factory->CreateHwndRenderTarget(D2D1::HwndTargetParameters(hWnd), &renderTarget);
   renderTarget->Bind(bitmap);

4. **绘制图片**[^2]：

   ID2D1SolidColorBrush* brush = nullptr;
   deviceContext->CreateSolidColorBrush(D2D1::ColorF(D2D1::ColorF::White), &brush);
   D2D1_RECT_F srcRect = D2D1::RectF(0.0f, 0.0f, size.width, size.height);
   deviceContext->DrawBitmap(bitmap, srcRect, brush);

5. **清理资源**：

   if (brush)
       brush->Release();
   if (renderTarget)
       renderTarget->Release();
   if (bitmap)
       bitmap->Release();
   if (deviceContext)
       deviceContext->Release();
   if (factory)
       factory->Release();

注意：以上代码片段简化了实际过程，可能需要处理错误和异常，并确保正确传递窗口句柄（`HWND hWnd`）给`D2D1_HwndTargetParameters`构造函数。