/// <summary>
/// Open image with STBI library
/// </summary>
/// <param name="bitmap">raw bitmap datas</param>
/// <param name="requestedChannels">Force returned channels count, set 0 for original count</param>
public StbImage(Memory <byte> bitmap, int requestedChannels = 4)
{
#if STB_SHARP
StbImageSharp.ImageResult stbi =
StbImageSharp.ImageResult.FromMemory(bitmap.ToArray(), (StbImageSharp.ColorComponents)requestedChannels);
Width = stbi.Width;
Height = stbi.Height;
Channels = (int)stbi.Comp;
gcHandle = GCHandle.Alloc(stbi.Data, GCHandleType.Pinned);
#else
Handle = StbImage.Load(ref MemoryMarshal.GetReference(bitmap.Span), bitmap.Length, out Width, out Height, out Channels, requestedChannels);
if (Handle == IntPtr.Zero)
{
throw new Exception($"STBI image loading error.");
}
#endif
if (requestedChannels > 0)
{
Channels = requestedChannels;
}
}
/// <summary>
/// Open image with STBI library
/// </summary>
/// <param name="path">file path</param>
/// <param name="requestedChannels">Force returned channels count, set 0 for original count</param>
public StbImage(string path, int requestedChannels = 4)
{
#if STB_SHARP
using (Stream stream = new FileStream(path, FileMode.Open)) {
StbImageSharp.ImageResult stbi =
StbImageSharp.ImageResult.FromStream(stream, (StbImageSharp.ColorComponents)requestedChannels);
Width = stbi.Width;
Height = stbi.Height;
Channels = (int)stbi.Comp;
gcHandle = GCHandle.Alloc(stbi.Data, GCHandleType.Pinned);
}
#else
Handle = StbImage.Load(path, out Width, out Height, out Channels, requestedChannels);
if (Handle == IntPtr.Zero)
{
throw new Exception($"STBI image loading error.");
}
#endif
if (requestedChannels > 0)
{
Channels = requestedChannels;
}
}
/// <summary>
/// Open image with STBI library
/// </summary>
/// <param name="bitmap">raw bitmap datas</param>
/// <param name="bitmapByteCount">Bitmap byte count.</param>
/// <param name="requestedChannels">Force returned channels count, set 0 for original count</param>
public StbImage(IntPtr bitmap, ulong bitmapByteCount, int requestedChannels = 4)
{
#if STB_SHARP
unsafe {
Span <byte> byteArray = new Span <byte> (bitmap.ToPointer(), (int)bitmapByteCount);
StbImageSharp.ImageResult stbi =
StbImageSharp.ImageResult.FromMemory(byteArray.ToArray(), (StbImageSharp.ColorComponents)requestedChannels);
Width = stbi.Width;
Height = stbi.Height;
Channels = (int)stbi.Comp;
gcHandle = GCHandle.Alloc(stbi.Data, GCHandleType.Pinned);
}
#else
Handle = StbImage.Load(bitmap, (int)bitmapByteCount, out Width, out Height, out Channels, requestedChannels);
if (Handle == IntPtr.Zero)
{
throw new Exception($"STBI image loading error.");
}
#endif
if (requestedChannels > 0)
{
Channels = requestedChannels;
}
}
