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Currently I use bmp files for an SDL app, but I want to hide them to distribute my exe. I thought moving them as raw bytes into header files was a good way, since the BMP are very simple Black&White patterns.

Am not sure if this is possible by using SDL only, but so far I fail to load a simple pattern of bits.

// data.h    
const unsigned char rawPixels[] =
{
    0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,0xFF, 0xFF, 0xFF, 0xFF,0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,0xFF, 0xFF, 0xFF, 0xFF,0xFF, 0xFF, 0xFF, 0xFF,
};


// main.cpp
...
SDL_RWops *pixelsWop = SDL_RWFromConstMem((const unsigned char *)rawPixels, sizeof(rawPixels));
SDL_Surface *pixelsSurface = SDL_LoadBMP_RW(pixelsWop, 1);
SDL_BlitSurface(pixelsSurface, NULL, NULL, NULL);
...

I only get an empty surface from the SDL_LoadBMP_RW call, maybe the array should contain proper BMP header, etc. Could someone point out if that's the problem? Is there another way of loading this?

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1 回答 1

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这不起作用的原因是因为您的数据不代表位图，它是原始像素数据。如果您想查看原始位图的外观，只需在绘画中创建一个并在十六进制编辑器中打开它，您将看到标题，然后是实际的像素数据。

我建议只需SDL_Surface使用您想要的尺寸创建一个，然后从该页面修改像素访问方法以获取原始数据或调用putpixel您的每个像素（如果这仅用于测试目的）。

根据几个因素，您的所有像素都不会是内存中的连续值数组，您需要考虑SDL_Surface'spitch和bpp（每像素字节数）。在您的情况下，我假设它是 8 位（1 字节）像素？在这种情况下，可以很容易地pixels逐行填充数据，pitch每次移动行指针。

您可能也会发现此文档很有趣。

于 2013-05-18T00:22:24.687 回答