public static void LoadImage(string file, out int width, out int height, out byte[] data)
{
if (!File.Exists(file))
{
throw new FileNotFoundException("Texture file not found.", file);
}
IntPtr surfaceID = SDL_image.IMG_Load(file);
// If image load fails, generate a default pink error texture
if (surfaceID == IntPtr.Zero)
{
//throw new FileNotFoundException($"TextureDataFromStream: {SDL_GetError()}", file);
surfaceID = SDL_CreateRGBSurfaceWithFormat(0, 32, 32, 0, SDL_PIXELFORMAT_ABGR8888);
unsafe
{
SDL_Surface * surfacePtr = (SDL_Surface *)surfaceID;
SDL_PixelFormat *pixelFormatPtr = (SDL_PixelFormat *)surfacePtr->format;
SDL_FillRect(surfaceID, IntPtr.Zero, SDL_MapRGB((IntPtr)pixelFormatPtr, 255, 20, 147));
}
}
surfaceID = ConvertSurfaceFormat(surfaceID);
unsafe
{
SDL_Surface *surface = (SDL_Surface *)surfaceID;
width = surface->w;
height = surface->h;
data = new byte[width * height * 4];
Marshal.Copy(surface->pixels, data, 0, data.Length);
}
SDL_FreeSurface(surfaceID);
// Enforce alpha
for (int i = 0; i < data.Length; i += 4)
{
if (data[i + 3] == 0)
{
data[i] = 0;
data[i + 1] = 0;
data[i + 2] = 0;
}
}
data = FlipImageData(width, height, 4, data);
}
private static unsafe IntPtr ConvertSurfaceFormat(IntPtr surface)
{
IntPtr result = surface;
unsafe
{
SDL_Surface * surPtr = (SDL_Surface *)surface;
SDL_PixelFormat *pixelFormatPtr = (SDL_PixelFormat *)surPtr->format;
// SurfaceFormat.Color is SDL_PIXELFORMAT_ABGR8888
if (pixelFormatPtr->format != SDL_PIXELFORMAT_ABGR8888)
{
// Create a properly formatted copy, free the old surface
result = SDL_ConvertSurfaceFormat(surface, SDL_PIXELFORMAT_ABGR8888, 0);
SDL_FreeSurface(surface);
}
}
return(result);
}
public static extern SDL_Surface *SDL_ConvertSurface(SDL_Surface *src, SDL_PixelFormat *fmt, uint flags);