/// <summary>
/// Generates a set of swatches based on an image passed in; default number of swatches is 7
/// </summary>
/// <param name="image">Bitmap of image that we want to generate swatches </param>
/// <returns>Array of swatchDTOs (essentially int arrays of RGB values) representing 7 colors picked based on whatever algorithm we use</returns>
private SwatchDTO[] GenerateColorSwatches(Bitmap image)
{
// set up our variables: the pixel count and the area of the bitmap for easy reference
const int PIXEL_COUNT = 3;
BitmapData bmpData = null;
var bmpArea = image.Width * image.Height;
// create the array that will hold the rgb values as well as the one that will hold the hsv values
var pixelBois = new byte[bmpArea * PIXEL_COUNT];
var hsvValues = new Hsv[bmpArea];
try
{
bmpData = image.LockBits(new Rectangle(0, 0, image.Width, image.Height), ImageLockMode.ReadOnly,
image.PixelFormat); // or PixelFormat.Format24bppRgb
// copy the bytes into a byte array the length of the image's dimensions * 3 (for each R G B value)
Marshal.Copy(bmpData.Scan0, pixelBois, 0, pixelBois.Length);
}
finally
{
image.UnlockBits(bmpData);
}
for (int i = 0; i < pixelBois.Length; i += PIXEL_COUNT)
{
// create a color object with the RGB values reversed as the storage from the int* pointer goes BGR
// Shout out to github.com/programmingthomas for helping resolve this problem
var c = Color.FromArgb(pixelBois[i + 2], pixelBois[i + 1], pixelBois[i]);
// convert it to HSV and store it in the corresponding HSV array (divided by 3 since each represents a whole pixel value)
hsvValues[i / PIXEL_COUNT] = new Hsv(c);
}
var hsvSwatches = SortByHueAndFormatHsvValues(hsvValues.ToList());
var rgbSwatches = hsvSwatches.Select(hsv => new SwatchDTO(hsv.ToRGB())).ToArray();
return(rgbSwatches);
}