public unsafe bool MoveNext()
{
// Read next frame
int ccomp;
byte two_back;
var result = StbImage.stbi__gif_load_next(_context, _gif, &ccomp, (int)ColorComponents, &two_back);
if (result == null)
{
return(false);
}
if (Current == null)
{
Current = new AnimatedFrameResult
{
Width = _gif.w,
Height = _gif.h,
SourceComp = (ColorComponents)ccomp,
Comp = ColorComponents == ColorComponents.Default ? (ColorComponents)ccomp : ColorComponents
};
Current.Data = new byte[Current.Width * Current.Height * (int)Current.Comp];
}
Current.DelayInMs = _gif.delay;
Marshal.Copy(new IntPtr(result), Current.Data, 0, Current.Data.Length);
return(true);
}
public unsafe static ImageInfo?FromStream(Stream stream)
{
int width, height, comp;
var context = new StbImage.stbi__context(stream);
var is16Bit = StbImage.stbi__is_16_main(context) == 1;
StbImage.stbi__rewind(context);
var infoResult = StbImage.stbi__info_main(context, &width, &height, &comp);
StbImage.stbi__rewind(context);
if (infoResult == 0)
{
return(null);
}
return(new ImageInfo
{
Width = width,
Height = height,
ColorComponents = (ColorComponents)comp,
BitsPerChannel = is16Bit ? 16 : 8
});
}
public AnimatedGifEnumerator(Stream input, ColorComponents colorComponents)
{
if (input == null)
{
throw new ArgumentNullException(nameof(input));
}
_context = new StbImage.stbi__context(input);
if (StbImage.stbi__gif_test(_context) == 0)
{
throw new Exception("Input stream is not GIF file.");
}
_gif = new StbImage.stbi__gif();
ColorComponents = colorComponents;
}
public static unsafe ImageResultFloat FromStream(Stream stream, ColorComponents requiredComponents = ColorComponents.Default)
{
float *result = null;
try
{
int x, y, comp;
var context = new StbImage.stbi__context(stream);
result = StbImage.stbi__loadf_main(context, &x, &y, &comp, (int)requiredComponents);
return(FromResult(result, x, y, (ColorComponents)comp, requiredComponents));
}
finally
{
if (result != null)
{
CRuntime.free(result);
}
}
}
