Question

我正在尝试捕获整个桌面屏幕（前缓冲区），并为每个帧添加徽标和标题。

我将徽标（.png或.jpeg文件）加载为IDirect3DTexture9，然后尝试将其添加到IDirect3DSurface9图像框架（截图）。

由于我是DirecX9的新手，所以我不知道如何将徽标（纹理）复制到屏幕截图（表面/缓冲区）。任何帮助将不胜感激。

（如果还有其他方法可以在不涉及纹理的情况下向每个框架添加徽标，请告诉我。）

编辑：我使用了下面答案中建议的代码。返回的hr结果是错误。

IDirect3DSurface9 *pSurface = NULL;
pDevice->GetFrontBufferData(0, pSurface); //my screenshot

LPDIRECT3DTEXTURE9 tex = NULL;  //my logo
//[code to load logo from file here]

IDirect3DSurface9 *pSurf = NULL;
tex->GetSurfaceLevel(0, &pSurf);

hr = pDevice->StretchRect(pSurf, NULL, pSurface, NULL, D3DTEXF_NONE);  //HR GIVES AN ERROR

Answer 1

您可以使用StretchRect。代码看起来像这样（伪）：

ID3DSurface9 *pScreenSurface = ... // your screenshot surface should be created in default pool and the same format as your texture(see bellow), like this:
CreateOffscreenPlainSurface(width, height, D3DFMT_X8B8G8R8, D3DPOOL_DEFAULT, &pScreenSurface, NULL);

// Now get a screenshot by using either GetFrontBufferData, or GetBackBuffer/GetRenderTargetData by supplying pScreenSurface as a parameter (not shown here).

ID3DTexture9 *pTexture = ... // your texture should be loaded in default pool and the same format as your screenshot surface, like this:
D3DXCreateTextureFromFileEx(*ppDevice, L"icon.bmp", 40, 40, D3DX_DEFAULT, 0, 
  D3DFMT_X8B8G8R8, D3DPOOL_DEFAULT, D3DX_DEFAULT, D3DX_DEFAULT, 0, NULL, 
  NULL, &pTexture);

ID3DSurface9 *pSurf;
pTexture->GetSurfaceLevel(0, &pSurf); // don't forget to Release pSurf after StretchRect

RECT rc = { ... initialize the destination rectangle here };
pDevice->StretchRect(pSurf, NULL, pScreenSurface, &rc);

您需要在目标曲面内指定一个目标矩形，要将纹理复制到该矩形上。

如何将DirectX纹理复制到表面？

1 个答案: