//-------------------------------------------------------------------------------------
// Encodes a single frame
//-------------------------------------------------------------------------------------
private static void EncodeImage(PixelBuffer image, WICFlags flags, BitmapFrameEncode frame)
{
Guid pfGuid;
if (!ToWIC(image.Format, out pfGuid))
{
throw new NotSupportedException("Format not supported");
}
frame.Initialize();
frame.SetSize(image.Width, image.Height);
frame.SetResolution(72, 72);
Guid targetGuid = pfGuid;
frame.SetPixelFormat(ref targetGuid);
if (targetGuid != pfGuid)
{
using (var source = new Bitmap(Factory, image.Width, image.Height, pfGuid, new DataRectangle(image.DataPointer, image.RowStride), image.BufferStride))
{
using (var converter = new FormatConverter(Factory))
{
using (var palette = new Palette(Factory))
{
palette.Initialize(source, 256, true);
converter.Initialize(source, targetGuid, GetWICDither(flags), palette, 0, BitmapPaletteType.Custom);
int bpp = GetBitsPerPixel(targetGuid);
if (bpp == 0)
{
throw new NotSupportedException("Unable to determine the Bpp for the target format");
}
int rowPitch = (image.Width * bpp + 7) / 8;
int slicePitch = rowPitch * image.Height;
var temp = Utilities.AllocateMemory(slicePitch);
try
{
converter.CopyPixels(rowPitch, temp, slicePitch);
frame.SetPalette(palette);
frame.WritePixels(image.Height, temp, rowPitch, slicePitch);
}
finally
{
Utilities.FreeMemory(temp);
}
}
}
}
}
else
{
// No conversion required
frame.WritePixels(image.Height, image.DataPointer, image.RowStride, image.BufferStride);
}
frame.Commit();
}
