public AnimatedGifFrame[] ReadAnimatedGif(Stream stream, out int x, out int y, out int comp, int req_comp)
{
try
{
x = y = comp = 0;
var res = new List <AnimatedGifFrame>();
_stream = stream;
var context = new StbImage.stbi__context();
StbImage.stbi__start_callbacks(context, _callbacks, null);
if (StbImage.stbi__gif_test(context) == 0)
{
throw new Exception("Input stream is not GIF file.");
}
var g = new StbImage.stbi__gif();
do
{
int ccomp;
var result = StbImage.stbi__gif_load_next(context, g, &ccomp, req_comp);
if (result == null)
{
break;
}
comp = ccomp;
var c = req_comp != 0 ? req_comp : comp;
var data = new byte[g.w * g.h * c];
Marshal.Copy(new IntPtr(result), data, 0, data.Length);
CRuntime.free(result);
var frame = new AnimatedGifFrame
{
Data = data,
Delay = g.delay
};
res.Add(frame);
} while (true);
CRuntime.free(g._out_);
if (res.Count > 0)
{
x = g.w;
y = g.h;
}
return(res.ToArray());
}
finally
{
_stream = null;
}
}
public Image Read(Stream stream, int req_comp = StbImage.STBI_default)
{
_stream = stream;
try
{
int x, y, comp;
var result = StbImage.stbi_load_from_callbacks(_callbacks, null, &x, &y, &comp, req_comp);
var image = new Image
{
Width = x,
Height = y,
SourceComp = comp,
Comp = req_comp == StbImage.STBI_default ? comp : req_comp
};
if (result == null)
{
throw new Exception(StbImage.LastError);
}
// Convert to array
var data = new byte[x * y * image.Comp];
Marshal.Copy(new IntPtr(result), data, 0, data.Length);
CRuntime.free(result);
image.Data = data;
return(image);
}
finally
{
_stream = null;
}
}