SDL DisplayFormat does rectangle
SDL DisplayFormat does rectangle
我对SDL和c++都是新手。
然而,当我对图像进行DisplayFormat以加快比特化时,它会使其成为矩形。
SDL_Surface* tempImage = NULL;
// The image that will be used (optimized)
image = NULL;
image = IMG_Load( filename.c_str() );
if ( tempImage != NULL )
{
// Create optimization
image = SDL_DisplayFormat( tempImage ); // Makes the circle an rectangle
// Free the old image
SDL_FreeSurface( tempImage );
}
为什么?
这是因为您要转换图像的显示格式不支持透明像素。您必须将视频模式设置为每像素32位,如下所示:
SDL_Init(SDL_INIT_EVERYTHING);
SDL_Surface *window = SDL_SetVideoMode(width, height, 32, flags);
// ...
您还需要将SDL_DisplayFormat
更改为SDL_DisplayFormatAlpha
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