/// <summary>Resizes the bitmap to the specified size.</summary>
/// <remarks>This should be overloaded to speed up the resize.</remarks>
/// <param name="width">The width.</param>
/// <param name="height">The height.</param>
/// <param name="mode">The resize mode.</param>
/// <returns></returns>
public virtual Bitmap32 Resize(int width, int height, ResizeMode mode = 0)
{
var result = new Bitmap32(width, height);
float w = width;
float h = height;
if (mode != ResizeMode.None)
{
float fw = w / (float)Width;
float fh = h / (float)Height;
float f;
if (mode.HasFlag(ResizeMode.TouchFromInside))
{
f = Math.Min(fw, fh);
}
else
{
f = Math.Max(fw, fh);
}
w = Width * f;
h = Height * f;
}
float x = (width - w) / 2;
float y = (height - h) / 2;
result.Draw(this, x, y, w, h);
return(result);
}
/// <summary>
/// Creates a 32x32 fingerprint for the specified bitmap.
/// </summary>
/// <param name="bitmap">The bitmap.</param>
/// <returns>Returns a fingerprint with 6 bits per pixel (32 px = 6144 bit = 768 byte = 1024 base32 chars).</returns>
public static FingerPrint Create(IBitmap32 bitmap)
{
using (Bitmap32 thumb = bitmap.Resize(32, 32, ResizeMode.TouchFromInside))
{
ARGBImageData data = thumb.Data;
using (var ms = new MemoryStream())
{
// calculate fingerprint and distance matrix
var writer = new BitStreamWriter(ms);
float[] distanceMatrix = new float[16];
{
int x = 0, y = 0;
ARGB last = 0;
foreach (ARGB pixel in data.Data)
{
if (++x > 15)
{
x = 0;
++y;
}
int r = pixel.Red >> 6;
int g = pixel.Green >> 6;
int b = pixel.Blue >> 6;
writer.WriteBits(r, 2);
writer.WriteBits(g, 2);
writer.WriteBits(b, 2);
unchecked
{
int i = ((y << 1) & 0xC) + (x >> 2);
float distance = Math.Abs(pixel.GetDistance(last));
distanceMatrix[i] += distance;
last = pixel;
}
}
}
// normalize matrix
float maxDistance = distanceMatrix.Max();
for (int i = 0; i < distanceMatrix.Length; i++)
{
distanceMatrix[i] /= maxDistance;
}
// calculate blocks
uint[] blocks = new uint[4];
int[] index = new int[] { 0, 2, 8, 10 };
for (int i = 0; i < 4; i++)
{
int idx = index[i];
uint blockValue = (uint)(255 * distanceMatrix[idx]) << 24;
blockValue |= (uint)(255 * distanceMatrix[idx + 1]) << 16;
blockValue |= (uint)(255 * distanceMatrix[idx + 4]) << 8;
blockValue |= (uint)(255 * distanceMatrix[idx + 5]);
blocks[i] = blockValue;
}
/*
* uint b1 = (uint)(uint.MaxValue * (distanceMatrix[0] + distanceMatrix[1] + distanceMatrix[4] + distanceMatrix[5]) /4);
* uint b2 = (uint)(uint.MaxValue * (distanceMatrix[3] + distanceMatrix[2] + distanceMatrix[7] + distanceMatrix[6]) / 4);
* uint b3 = (uint)(uint.MaxValue * (distanceMatrix[12] + distanceMatrix[13] + distanceMatrix[8] + distanceMatrix[9]) / 4);
* uint b4 = (uint)(uint.MaxValue * (distanceMatrix[15] + distanceMatrix[14] + distanceMatrix[11] + distanceMatrix[10]) / 4);
*/
return(new FingerPrint(32, blocks, ms.ToArray()));
}
}
}
/// <summary>Draws the specified image ontop of this one.</summary>
/// <param name="other">The image to draw.</param>
/// <param name="x">The x position.</param>
/// <param name="y">The y position.</param>
/// <param name="translation">The translation.</param>
public virtual void Draw(Bitmap32 other, int x, int y, Translation?translation = null)
{
bitmap.Draw(other, x, y, other.Width, other.Height, translation);
}
/// <summary>Draws the specified image ontop of this one.</summary>
/// <param name="other">The image to draw.</param>
/// <param name="x">The x position.</param>
/// <param name="y">The y position.</param>
/// <param name="width">The width.</param>
/// <param name="height">The height.</param>
/// <param name="translation">The translation.</param>
public virtual void Draw(Bitmap32 other, float x, float y, float width, float height, Translation?translation = null)
{
bitmap.Draw(other, x, y, width, height, translation);
}
/// <summary>Draws the specified image ontop of this one.</summary>
/// <param name="other">The image to draw.</param>
/// <param name="x">The x position.</param>
/// <param name="y">The y position.</param>
/// <param name="width">The width.</param>
/// <param name="height">The height.</param>
/// <param name="translation">The translation.</param>
public override void Draw(Bitmap32 other, float x, float y, float width, float height, Translation?translation = null)
{
Draw(Convert(other), x, y, width, height, translation);
}
/// <summary>Draws the specified image ontop of this one.</summary>
/// <param name="other">The image to draw.</param>
/// <param name="x">The x position.</param>
/// <param name="y">The y position.</param>
/// <param name="translation">The translation.</param>
public override void Draw(Bitmap32 other, int x, int y, Translation?translation = null)
{
Draw(other, x, y, other.Width, other.Height, translation);
}
/// <summary>Draws the specified image ontop of this one.</summary>
/// <param name="other">The image to draw.</param>
/// <param name="x">The x position.</param>
/// <param name="y">The y position.</param>
/// <param name="width">The width.</param>
/// <param name="height">The height.</param>
/// <param name="translation">The translation.</param>
public override void Draw(Bitmap32 other, float x, float y, float width, float height, Translation?translation = null)
{
Draw(GdiBitmap32Extensions.ToGdiBitmap(other), x, y, width, height, translation);
}
/// <summary>Draws the specified image ontop of this one.</summary> /// <param name="other">The image to draw.</param> /// <param name="x">The x position.</param> /// <param name="y">The y position.</param> /// <param name="width">The width.</param> /// <param name="height">The height.</param> /// <param name="translation">The translation.</param> public override void Draw(Bitmap32 other, int x, int y, int width, int height, Translation?translation = null) => Draw(GdiBitmap32Extensions.ToGdiBitmap(other), x, y, width, height, translation);
/// <summary>Draws the specified image ontop of this one.</summary> /// <param name="other">The image to draw.</param> /// <param name="x">The x position.</param> /// <param name="y">The y position.</param> /// <param name="width">The width.</param> /// <param name="height">The height.</param> /// <param name="translation">The translation.</param> public virtual void Draw(Bitmap32 other, int x, int y, int width, int height, Translation?translation = null) => bitmap.Draw(other, x, y, width, height, translation);