private string GenerateText(Image <Rgba32> masterImage, int ratio = 5)
{
_progressService.Reset();
StringBuilder sb = new StringBuilder();
int hRatio = ratio * 2;
var totalProgress = masterImage.Height / hRatio;
for (int h = 0; h < masterImage.Height; h += hRatio)
{
Span <Rgba32> rowSpan = masterImage.GetPixelRowSpan(h);
for (var w = 0; w < masterImage.Width; w += ratio)
{
var grayColor = new L8();
grayColor.FromRgba32(rowSpan[w]);
int index = grayColor.PackedValue * 10 / 255;
sb.Append(asciiChars[index]);
}
sb.AppendLine();
_progressService.IncrementProgress(totalProgress);
}
return(sb.ToString());
}
public void L8_FromRgba32(byte rgb)
{
// Arrange
L8 gray = default;
byte expected = ColorNumerics.Get8BitBT709Luminance(rgb, rgb, rgb);
// Act
gray.FromRgba32(new Rgba32(rgb, rgb, rgb));
byte actual = gray.PackedValue;
// Assert
Assert.Equal(expected, actual);
}
public void Rgba32_ToL8_IsInverseOf_L8_ToRgba32(byte luminance)
{
var original = new L8(luminance);
Rgba32 rgba = default;
original.ToRgba32(ref rgba);
L8 mirror = default;
mirror.FromRgba32(rgba);
Assert.Equal(original, mirror);
}
public void CalculateIntegralImage_Rgba32Works(TestImageProvider <Rgba32> provider)
{
using Image <Rgba32> image = provider.GetImage();
// Act:
Buffer2D <ulong> integralBuffer = image.CalculateIntegralImage();
// Assert:
VerifySumValues(provider, integralBuffer, (Rgba32 pixel) =>
{
L8 outputPixel = default;
outputPixel.FromRgba32(pixel);
return(outputPixel.PackedValue);
});
}