SDL2 C ++截屏 [英] SDL2 C++ Taking a screenshot

问题描述

您好，我想知道是否可以使用SDL2截屏。
我尝试了 SDL_GetWindowSurface ，但出现错误消息：

Hi I would like to know if it is possible to simply take a screenshot with SDL2. I tried SDL_GetWindowSurface but I get an error saying:

否可用的硬件加速渲染器。

No hardware accelerated renderers available.

我从此处。

我认为另一种解决方案大约是将纹理转换为表面，但是我没有这么做...

Another solution I thought about is converting a texture to a surface but I didn't manage to do so...

您有任何解决方案吗？

推荐答案

似乎您正在混合渲染系统。该方法仅在软件渲染的情况下有效。对于硬件渲染，应使用方法 SDL_RenderReadPixels（）。要保存屏幕截图，您需要这样的代码：

It seems like you are mixing the rendering systems. That method will only work in the context of software rendering. For hardware rendering you should use the method SDL_RenderReadPixels(). To save the screenshot you would need a code like that:

SDL_Surface *sshot = SDL_CreateRGBSurface(0, w, h, 32, 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000);
SDL_RenderReadPixels(renderer, NULL, SDL_PIXELFORMAT_ARGB8888, sshot->pixels, sshot->pitch);
SDL_SaveBMP(sshot, "screenshot.bmp");
SDL_FreeSurface(sshot);

其中 w 和 h 宽度和高度（您可以使用 SDL_GetRendererOutputSize（）获得这些值）。

Where w and h are the screen width and height (you can get these values using SDL_GetRendererOutputSize()).

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