/// <summary> Decompresses a trigrad compressed bitmap. </summary>
/// <param name="compressionData"> The TrigradCompressed data.</param>
/// <param name="original"> The original image to determine the most effect fill mode.</param>
/// <param name="options"> Options dictating the decompression.</param>
public static TrigradDecompressed DecompressBitmap(TrigradCompressed compressionData, TrigradOptions options)
{
TrigradDecompressed decompressed = new TrigradDecompressed(compressionData.Width, compressionData.Height);
for (int x = 0; x < compressionData.Width; x++)
for (int y = 0; y < compressionData.Height; y++)
decompressed.Output[x, y] = new Pixel(Color.HotPink);
drawMesh(compressionData.Mesh, decompressed.Output, options);
fillGaps(decompressed.Output);
return decompressed;
}
/// <summary> Decompresses a trigrad compressed bitmap. </summary>
/// <param name="compressionData"> The TrigradCompressed data.</param>
/// <param name="colorGrader"> The color grader that will be used to fill the output bitmap.</param>
/// <param name="debug"> Bool specifying whether a debug output will be produced.</param>
public static TrigradDecompressed DecompressBitmap(TrigradCompressed compressionData, IGrader colorGrader = null,bool debug = false)
{
if (colorGrader == null)
colorGrader = new BarycentricGrader();
TrigradDecompressed decompressed = new TrigradDecompressed(compressionData.Width, compressionData.Height);
//build the triangle mesh
decompressed.Mesh = buildMesh(compressionData.SampleTable);
Parallel.ForEach(decompressed.Mesh.Triangles, triangle =>
{
var vU = triangle.GetVertex(0);
var vV = triangle.GetVertex(1);
var vW = triangle.GetVertex(2);
//find sample points of triangle
Color cU = compressionData.SampleTable[vU.Point()];
Color cV = compressionData.SampleTable[vV.Point()];
Color cW = compressionData.SampleTable[vW.Point()];
//rasterize triangle to find points to fill
var points = TriangleRasterization.PointsInTriangle(vU.Point(), vV.Point(), vW.Point());
foreach (var point in points)
{
var coords = Barycentric.GetCoordinates(point, vU, vV, vW);
Color gradedColor = colorGrader.Grade(cU, cV, cW, coords.U, coords.V, coords.W, point.X, point.Y);
lock (decompressed.Output)
decompressed.Output.SetPixel(point.X, point.Y, gradedColor);
if(debug)
lock (decompressed.DebugOutput)
decompressed.DebugOutput.SetPixel(point.X, point.Y, Color.FromArgb((byte)(coords.U * 255), (byte)(coords.V * 255), (byte)(coords.W * 255)));
}
});
return decompressed;
}
