public static int stbi_write_hdr_core(stbi__write_context s, int x, int y, int comp, float *data)
{
if ((y <= 0) || (x <= 0) || (data == null))
{
return(0);
}
var scratch = (byte *)(CRuntime.malloc((ulong)(x * 4)));
int i;
var header = "#?RADIANCE\n# Written by stb_image_write.h\nFORMAT=32-bit_rle_rgbe\n";
var bytes = Encoding.UTF8.GetBytes(header);
fixed(byte *ptr = bytes)
{
s.func(s.context, ((sbyte *)ptr), bytes.Length);
}
var str = string.Format("EXPOSURE= 1.0000000000000\n\n-Y {0} +X {1}\n", y, x);
bytes = Encoding.UTF8.GetBytes(str);
fixed(byte *ptr = bytes)
{
s.func(s.context, ((sbyte *)ptr), bytes.Length);
}
for (i = 0; i < y; i++)
{
stbiw__write_hdr_scanline(s, x, comp, scratch, data + comp * i * x);
}
CRuntime.free(scratch);
return(1);
}
public Image Read(Stream stream, int req_comp = STBImage.STBI_rgb_alpha)
{
_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
};
if (result == null)
{
throw new Exception(STBImage.LastError);
}
var c = req_comp != 0 ? req_comp : comp;
var data = new byte[x * y * c];
Marshal.Copy(new IntPtr(result), data, 0, data.Length);
CRuntime.free(result);
image.Data = data;
return(image);
}
finally
{
_stream = null;
}
}
public AnimatedGifFrame[] ReadAnimatedGif(Stream stream, out int w, out int h,
int req_comp = STBImage.STBI_default)
{
try
{
w = h = 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;
}
var c = req_comp != 0 ? req_comp : ccomp;
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)
{
w = g.w;
h = g.h;
}
return(res.ToArray());
}
finally
{
_stream = null;
}
}
public static int stbi_write_png_to_func(WriteCallback func,
void *context,
int x,
int y,
int comp,
void *data,
int stride_bytes
)
{
int len;
var png = stbi_write_png_to_mem((byte *)(data), stride_bytes, x, y, comp, &len);
if (png == null)
{
return(0);
}
func(context, png, len);
CRuntime.free(png);
return(1);
}