/// <summary>
/// Fills the bottom right quadrant with all the colors producible by converting iterating over a uint and unpacking it.
/// A better algorithm could be used but it works
/// </summary>
private static void Rainbow(Buffer2D <TPixel> pixels)
{
int left = pixels.Width / 2;
int right = pixels.Width;
int top = pixels.Height / 2;
int bottom = pixels.Height;
int pixelCount = left * top;
uint stepsPerPixel = (uint)(uint.MaxValue / pixelCount);
TPixel c = default;
var t = new Rgba32(0);
for (int x = left; x < right; x++)
{
for (int y = top; y < bottom; y++)
{
t.PackedValue += stepsPerPixel;
var v = t.ToVector4();
// v.W = (x - left) / (float)left;
c.FromVector4(v);
pixels[x, y] = c;
}
}
}
public void Color_Types_To_Vector4_Produce_Equal_OutPut()
{
Rgba32 color = new Rgba32(24, 48, 96, 192);
RgbaVector colorVector = new RgbaVector(24, 48, 96, 192);
Assert.Equal(color.ToVector4(), colorVector.ToVector4());
}
public void Color_Types_To_Vector4_Produce_Equal_OutPut()
{
var color = new Rgba32(24, 48, 96, 192);
var colorVector = new RgbaVector(24 / 255F, 48 / 255F, 96 / 255F, 192 / 255F);
Assert.Equal(color.ToVector4(), colorVector.ToVector4());
}
public void TestAlphaCompositionModes(Rgba32 backdrop, Rgba32 source, float opacity, PixelAlphaCompositionMode mode, Rgba32 expectedResult)
{
PixelBlender <Rgba32> blender = PixelOperations <Rgba32> .Instance.GetPixelBlender(PixelColorBlendingMode.Normal, mode);
Rgba32 actualResult = blender.Blend(backdrop, source, opacity);
// var str = actualResult.Rgba.ToString("X8"); // used to extract expectedResults
Assert.Equal(actualResult.ToVector4(), expectedResult.ToVector4());
}
private static Rgba32 MultiplyColorWithScalar(Rgba32 color, float influence, bool includeA = false)
{
var colorVector = Vector4.Multiply(influence, color.ToVector4());
if (includeA)
{
colorVector.W = 255;
}
return(new Rgba32(colorVector));
}
/// <summary>
/// Writes a run length encoded tga image to the stream.
/// </summary>
/// <typeparam name="TPixel">The pixel type.</typeparam>
/// <param name="stream">The stream to write the image to.</param>
/// <param name="image">The image to encode.</param>
private void WriteRunLengthEncodedImage <TPixel>(Stream stream, ImageFrame <TPixel> image)
where TPixel : struct, IPixel <TPixel>
{
Rgba32 color = default;
Buffer2D <TPixel> pixels = image.PixelBuffer;
int totalPixels = image.Width * image.Height;
int encodedPixels = 0;
while (encodedPixels < totalPixels)
{
int x = encodedPixels % pixels.Width;
int y = encodedPixels / pixels.Width;
TPixel currentPixel = pixels[x, y];
currentPixel.ToRgba32(ref color);
byte equalPixelCount = this.FindEqualPixels(pixels, x, y);
// Write the number of equal pixels, with the high bit set, indicating ist a compressed pixel run.
stream.WriteByte((byte)(equalPixelCount | 128));
switch (this.bitsPerPixel)
{
case TgaBitsPerPixel.Pixel8:
int luminance = GetLuminance(currentPixel);
stream.WriteByte((byte)luminance);
break;
case TgaBitsPerPixel.Pixel16:
var bgra5551 = new Bgra5551(color.ToVector4());
BinaryPrimitives.TryWriteInt16LittleEndian(this.buffer, (short)bgra5551.PackedValue);
stream.WriteByte(this.buffer[0]);
stream.WriteByte(this.buffer[1]);
break;
case TgaBitsPerPixel.Pixel24:
stream.WriteByte(color.B);
stream.WriteByte(color.G);
stream.WriteByte(color.R);
break;
case TgaBitsPerPixel.Pixel32:
stream.WriteByte(color.B);
stream.WriteByte(color.G);
stream.WriteByte(color.R);
stream.WriteByte(color.A);
break;
}
encodedPixels += equalPixelCount + 1;
}
}
public Rgba32 GetRandomColourNearby(Rgba32 zColour, float zVariation)
{
Vector4 data = zColour.ToVector4();
float variation = zVariation / 2.0f;
//float lowerW = data.W - variation;
//float upperW = data.W + variation;
//float w = Random_Float(lowerW, upperW);
//data.W = Euclid.Limit(ref w, 0.0f, 1.0f);
float lowerX = data.X - variation;
float upperX = data.X + variation;
float x = GetRandomSingle(lowerX, upperX);
data.X = MathsUtils.Limit(ref x, 0.0f, 1.0f);
float lowerY = data.Y - variation;
float upperY = data.Y + variation;
float y = GetRandomSingle(lowerY, upperY);
data.Y = MathsUtils.Limit(ref y, 0.0f, 1.0f);
float lowerZ = data.Z - variation;
float upperZ = data.Z + variation;
float z = GetRandomSingle(lowerZ, upperZ);
data.Z = MathsUtils.Limit(ref z, 0.0f, 1.0f);
Rgba32 col = new Rgba32(data.X, data.Y, data.Z, data.W);
return col;
}
public void PackFromRgba32(Rgba32 source)
{
this.PackFromVector4(source.ToVector4());
}
public RaytraceMaterial(Rgba32 color, float albedoFactor, Rgba32 emmitance, float emmitingFactor)
{
Albedo = color.ToVector4() * albedoFactor;
Emittance = emmitance.ToVector4() * emmitingFactor;
}
public RaytraceMaterial(Rgba32 color)
{
Albedo = color.ToVector4();
Emittance = Vector4.Zero;
}