public void Encode(
IReadOnlyPixelRows image,
CancellationToken cancellationToken = default)
{
if (image == null)
{
throw new ArgumentNullException(nameof(image));
}
AssertCanEncodeImage(image);
var pixelInfo = image.PixelType.ComponentInfo;
// TODO: change components to dynamic/controlled (maybe in encoder options)
bool imageHasAlpha = pixelInfo.HasComponentType(VectorComponentChannel.Alpha);
bool encoderSupportsAlpha = true; // TODO: implement (encoderState.Encoder.SupportedComponents HasAttribute();)
int colors = 3; // TODO: also implement grayscale
int alpha = (imageHasAlpha && encoderSupportsAlpha) ? 1 : 0;
int components = colors + alpha;
int imageMaxDepth = pixelInfo.MaxBitDepth;
int encoderMinDepth = 8; // TODO: implement
int encoderMaxDepth = 8; // TODO: implement
int variableDepth = Math.Max(encoderMinDepth, imageMaxDepth);
int depth = Math.Min(encoderMaxDepth, variableDepth);
var provider = new PixelRowProvider(image, components, depth, cancellationToken);
Write(provider);
FrameIndex++;
}
protected override void Write(PixelRowProvider image)
{
// TODO: add forcedFilter option
StbSharp.ImageWrite.Png.Write(
Writer, image, EncoderOptions.CompressionLevel, null, null, RecyclableArrayPool.Shared);
}
protected override void Write(PixelRowProvider image)
{
bool useFloatPixels = image.Depth > 8;
bool allowSubsample = EncoderOptions.Subsampling == JpegSubsampling.Allow;
bool forceSubsample = EncoderOptions.Subsampling == JpegSubsampling.Force;
StbSharp.ImageWrite.Jpeg.WriteCore(
Writer, image, useFloatPixels, EncoderOptions.Quality, allowSubsample, forceSubsample);
}
protected override void Write(PixelRowProvider image)
{
// TODO: allow different bit depths
throw new NotImplementedException();
byte[] pixeldata = new byte[image.Width * image.Height * 4];
for (int i = 0; i < image.Height; i++)
{
image.GetByteRow(i, pixeldata);
}
}
protected abstract void Write(PixelRowProvider image);
protected override void Write(PixelRowProvider image)
{
// TODO: allow different bit depths
StbSharp.ImageWrite.Bmp.Write(Writer, image);
}
protected override void Write(PixelRowProvider image)
{
StbSharp.ImageWrite.Tga.Write(Writer, image, EncoderOptions.UseRunLengthEncoding);
}
