public static void DrawImage([NotNull] this ConsoleBuffer @this, [NotNull] ImageSource imageSource, int x, int y, int width, int height)
{
if (@this == null)
{
throw new ArgumentNullException(nameof(@this));
}
var bmp = imageSource as BitmapSource ?? throw new ArgumentException("Only rendering of bitmap source is supported.");
@this.OffsetX(ref x).OffsetY(ref y);
int x1 = x, x2 = x + width, y1 = y, y2 = y + height;
if ([email protected](ref x1, ref y1, ref x2, ref y2))
{
return;
}
if (width != bmp.PixelWidth || height != bmp.PixelHeight)
{
bmp = new TransformedBitmap(bmp, new ScaleTransform((double)width / bmp.PixelWidth, (double)height / bmp.PixelHeight));
}
if (bmp.Format != PixelFormats.Indexed4)
{
bmp = new FormatConvertedBitmap(bmp, PixelFormats.Indexed4, BitmapPalettes.Halftone8Transparent, 0.5);
}
const int bitsPerPixel = 4;
int stride = 4 * (bmp.PixelWidth * bitsPerPixel + 31) / 32;
byte[] bytes = new byte[stride * bmp.PixelHeight];
bmp.CopyPixels(bytes, stride, 0);
Debug.Assert(bmp.Palette != null);
for (int iy = y1, py = 0; iy < y2; iy++, py++)
{
ConsoleChar[] charsLine = @this.GetLine(iy);
for (int ix = x1, px = 0; ix < x2; ix++, px++)
{
int byteIndex = stride * py + px / 2;
int bitOffset = px % 2 == 0 ? 4 : 0;
SetColor(ref charsLine[ix], bmp.Palette, (bytes[byteIndex] >> bitOffset) & 0b1111);
}
}
}
