DirectX9任意大小的纹理（非2 ^ n） [英] DirectX9 Texture of arbitrary size (non 2^n)

问题描述

我是DirectX的新手，必须在现有的C ++ DX9应用程序上工作。该应用程序对摄像机图像进行跟踪，并显示一些DirectDraw（即2d）内容。相机的纵横比为4：3（总是），屏幕未定义。

I'm relatively new to DirectX and have to work on an existing C++ DX9 application. The app does tracking on a camera images and displays some DirectDraw (ie. 2d) content. The camera has an aspect ratio of 4:3 (always) and the screen is undefined.

我想加载纹理并使用此纹理作为掩码，并且仅在纹理的掩蔽区域内进行内容的显示。因此，我想加载一个尺寸与相机图像完全相同的纹理。

I want to load a texture and use this texture as a mask, so tracking and displaying of the content only are done within the masked area of the texture. Therefore I'd like to load a texture that has exactly the same size as the camera images.

我已经完成了所有步骤来加载纹理，但是当我调用 GetDesc（） code> D3DSURFACE_DESC struct是下一个更大的2的幂。我不在乎用于纹理的实际内存是针对显卡优化的，但我没有找到任何方法来获取原始图像文件在硬盘上的尺寸。

I've done all steps to load the texture, but when I call GetDesc() the fields Width and Height of the D3DSURFACE_DESC struct are of the next bigger power-of-2 size. I do not care that the actual memory used for the texture is optimized for the graphics card but I did not find any way to get the dimensions of the original image file on the harddisk.

我做（并没有成功，但没有成功）搜索一个可能性加载到计算机的RAM只有图形卡（不需要图形卡），而无需添加一个新的依赖关系的代码。否则，我将不得不使用OpenCV（这可能反正是一个好主意，当涉及到跟踪），但在这一刻我仍然尽量避免包括OpenCV。

I do (and did, but with no success) search a possibility to load the image into the computers RAM only (graphicscard is not required) without adding a new dependency to the code. Otherwise I'd have to use OpenCV (which might anyway be a good idea when it comes to tracking), but at the moment I still try to avoid including OpenCV.

感谢您的提示，
Norbert

thanks for your hints, Norbert

推荐答案

D3DXCreateTextureFromFileEx （参数3和4为

D3DX_DEFAULT_NONPOW2.

之后，您可以使用

D3DSURFACE_DESC Desc;
m_Sprite->GetLevelDesc(0, &Desc);

获取高度&

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