public static void ToSepia(BitmapHolder bmp)
{
var nWidth = bmp.Width;
var nHeight = bmp.Height;
var len = bmp.PixelCount;
for (var i = 0; i < len; i++)
{
var c = bmp.GetPixelAsInt(i);
var a = (c >> 24) & 0x000000FF;
var r = (c >> 16) & 0x000000FF;
var g = (c >> 8) & 0x000000FF;
var b = (c) & 0x000000FF;
var rNew = (int)Math.Min((.393 * r) + (.769 * g) + (.189 * (b)), 255.0);
var gNew = (int)Math.Min((.349 * r) + (.686 * g) + (.168 * (b)), 255.0);
var bNew = (int)Math.Min((.272 * r) + (.534 * g) + (.131 * (b)), 255.0);
if (rNew > 255)
rNew = 255;
if (gNew > 255)
gNew = 255;
if (bNew > 255)
bNew = 255;
bmp.SetPixel(i, (a << 24) | (rNew << 16) | (gNew << 8) | bNew);
}
}
public static void ToReplacedColor(BitmapHolder bmp, int r, int g, int b, int a)
{
var nWidth = bmp.Width;
var nHeight = bmp.Height;
var len = bmp.PixelCount;
for (var i = 0; i < len; i++)
{
var c = bmp.GetPixelAsInt(i);
var currentAlpha = (c >> 24) & 0x000000FF;
var aNew = (int)(currentAlpha * (a / currentAlpha));
var rNew = r;
var gNew = g;
var bNew = b;
if (rNew > 255)
rNew = 255;
if (gNew > 255)
gNew = 255;
if (bNew > 255)
bNew = 255;
bmp.SetPixel(i, (aNew << 24) | (rNew << 16) | (gNew << 8) | bNew);
}
}
public static BitmapHolder ToFlipped(BitmapHolder bmp, FlipType flipMode)
{
// Use refs for faster access (really important!) speeds up a lot!
var w = bmp.Width;
var h = bmp.Height;
var i = 0;
BitmapHolder result = new BitmapHolder(new byte[bmp.PixelData.Length], w, h);
if (flipMode == FlipType.Vertical)
{
var rp = result.PixelData;
for (var y = h - 1; y >= 0; y--)
{
for (var x = 0; x < w; x++)
{
var srcInd = y * w + x;
result.SetPixel(i, bmp.GetPixelAsInt(srcInd));
i++;
}
}
}
else
{
var rp = result.PixelData;
for (var y = 0; y < h; y++)
{
for (var x = w - 1; x >= 0; x--)
{
var srcInd = y * w + x;
result.SetPixel(i, bmp.GetPixelAsInt(srcInd));
i++;
}
}
}
return result;
}
public static void ToGrayscale(BitmapHolder bmp)
{
var nWidth = bmp.Width;
var nHeight = bmp.Height;
var len = bmp.PixelCount;
for (var i = 0; i < len; i++)
{
var c = bmp.GetPixelAsInt(i);
var a = (c >> 24) & 0x000000FF;
var r = (c >> 16) & 0x000000FF;
var g = (c >> 8) & 0x000000FF;
var b = (c) & 0x000000FF;
// Convert to gray with constant factors 0.2126, 0.7152, 0.0722
var gray = (r * 6966 + g * 23436 + b * 2366) >> 15;
r = g = b = gray;
bmp.SetPixel(i, (a << 24) | (r << 16) | (g << 8) | b);
}
}
public static void ToColorSpace(BitmapHolder bmp, float[][] rgbawMatrix)
{
var r0 = rgbawMatrix[0][0];
var r1 = rgbawMatrix[0][1];
var r2 = rgbawMatrix[0][2];
var r3 = rgbawMatrix[0][3];
var g0 = rgbawMatrix[1][0];
var g1 = rgbawMatrix[1][1];
var g2 = rgbawMatrix[1][2];
var g3 = rgbawMatrix[1][3];
var b0 = rgbawMatrix[2][0];
var b1 = rgbawMatrix[2][1];
var b2 = rgbawMatrix[2][2];
var b3 = rgbawMatrix[2][3];
var a0 = rgbawMatrix[3][0];
var a1 = rgbawMatrix[3][1];
var a2 = rgbawMatrix[3][2];
var a3 = rgbawMatrix[3][3];
var rOffset = rgbawMatrix[4][0];
var gOffset = rgbawMatrix[4][1];
var bOffset = rgbawMatrix[4][2];
var aOffset = rgbawMatrix[4][3];
var nWidth = bmp.Width;
var nHeight = bmp.Height;
var len = bmp.PixelCount;
for (var i = 0; i < len; i++)
{
var c = bmp.GetPixelAsInt(i);
var a = (c >> 24) & 0x000000FF;
var r = (c >> 16) & 0x000000FF;
var g = (c >> 8) & 0x000000FF;
var b = (c) & 0x000000FF;
var rNew = (int)(r * r0 + g * g0 + b * b0 + a * a0 + rOffset);
var gNew = (int)(r * r1 + g * g1 + b * b1 + a * a1 + gOffset);
var bNew = (int)(r * r2 + g * g2 + b * b2 + a * a2 + bOffset);
var aNew = (int)(r * r3 + g * g3 + b * b3 + a * a3 + aOffset);
if (rNew > 255)
rNew = 255;
if (gNew > 255)
gNew = 255;
if (bNew > 255)
bNew = 255;
if (aNew > 255)
aNew = 255;
if (rNew < 0)
rNew = 0;
if (gNew < 0)
gNew = 0;
if (bNew < 0)
bNew = 0;
if (aNew < 0)
aNew = 0;
bmp.SetPixel(i, (aNew << 24) | (rNew << 16) | (gNew << 8) | bNew);
}
}
// Source: http://incubator.quasimondo.com/processing/superfast_blur.php
public static void ToLegacyBlurred(BitmapHolder source, int radius)
{
int w = source.Width;
int h = source.Height;
int wm = w - 1;
int hm = h - 1;
int wh = w * h;
int div = radius + radius + 1;
int[] r = new int[wh];
int[] g = new int[wh];
int[] b = new int[wh];
int rsum, gsum, bsum, x, y, i, p, p1, p2, yp, yi, yw;
int[] vmin = new int[Math.Max(w, h)];
int[] vmax = new int[Math.Max(w, h)];
int[] dv = new int[256 * div];
for (i = 0; i < 256 * div; i++)
{
dv[i] = (i / div);
}
yw = yi = 0;
for (y = 0; y < h; y++)
{
rsum = gsum = bsum = 0;
for (i = -radius; i <= radius; i++)
{
p = source.GetPixelAsInt(yi + Math.Min(wm, Math.Max(i, 0)));
rsum += (p & 0xff0000) >> 16;
gsum += (p & 0x00ff00) >> 8;
bsum += p & 0x0000ff;
}
for (x = 0; x < w; x++)
{
r[yi] = dv[rsum];
g[yi] = dv[gsum];
b[yi] = dv[bsum];
if (y == 0)
{
vmin[x] = Math.Min(x + radius + 1, wm);
vmax[x] = Math.Max(x - radius, 0);
}
p1 = source.GetPixelAsInt(yw + vmin[x]);
p2 = source.GetPixelAsInt(yw + vmax[x]);
rsum += ((p1 & 0xff0000) - (p2 & 0xff0000)) >> 16;
gsum += ((p1 & 0x00ff00) - (p2 & 0x00ff00)) >> 8;
bsum += (p1 & 0x0000ff) - (p2 & 0x0000ff);
yi++;
}
yw += w;
}
for (x = 0; x < w; x++)
{
rsum = gsum = bsum = 0;
yp = -radius * w;
for (i = -radius; i <= radius; i++)
{
yi = Math.Max(0, yp) + x;
rsum += r[yi];
gsum += g[yi];
bsum += b[yi];
yp += w;
}
yi = x;
for (y = 0; y < h; y++)
{
// Preserve alpha channel: ( 0xff000000 & pix[yi] )
source.SetPixel(yi, (int)((0xff000000 & (uint)source.GetPixelAsInt(yi)) | (uint)(dv[rsum] << 16) | (uint)(dv[gsum] << 8) | (uint)dv[bsum]));
if (x == 0)
{
vmin[y] = Math.Min(y + radius + 1, hm) * w;
vmax[y] = Math.Max(y - radius, 0) * w;
}
p1 = x + vmin[y];
p2 = x + vmax[y];
rsum += r[p1] - r[p2];
gsum += g[p1] - g[p2];
bsum += b[p1] - b[p2];
yi += w;
}
}
}
public static BitmapHolder ToRotated(BitmapHolder source, double degrees, bool ccw, bool resize)
{
if (degrees == 0 || degrees % 360 == 0)
return source;
if (ccw)
degrees = 360d - degrees;
// rotating clockwise, so it's negative relative to Cartesian quadrants
double cnAngle = -1.0 * (Math.PI / 180) * degrees;
// general iterators
int i, j;
// calculated indices in Cartesian coordinates
int x, y;
double fDistance, fPolarAngle;
// for use in neighboring indices in Cartesian coordinates
int iFloorX, iCeilingX, iFloorY, iCeilingY;
// calculated indices in Cartesian coordinates with trailing decimals
double fTrueX, fTrueY;
// for interpolation
double fDeltaX, fDeltaY;
// interpolated "top" pixels
double fTopRed, fTopGreen, fTopBlue, fTopAlpha;
// interpolated "bottom" pixels
double fBottomRed, fBottomGreen, fBottomBlue, fBottomAlpha;
// final interpolated color components
int iRed, iGreen, iBlue, iAlpha;
int iCentreX, iCentreY;
int iDestCentreX, iDestCentreY;
int iWidth, iHeight, newWidth, newHeight;
iWidth = source.Width;
iHeight = source.Height;
if (!resize || (degrees % 180 == 0))
{
newWidth = iWidth;
newHeight = iHeight;
}
else
{
var rad = degrees / (180 / Math.PI);
newWidth = (int)Math.Ceiling(Math.Abs(Math.Sin(rad) * iHeight) + Math.Abs(Math.Cos(rad) * iWidth));
newHeight = (int)Math.Ceiling(Math.Abs(Math.Sin(rad) * iWidth) + Math.Abs(Math.Cos(rad) * iHeight));
}
iCentreX = iWidth / 2;
iCentreY = iHeight / 2;
iDestCentreX = newWidth / 2;
iDestCentreY = newHeight / 2;
var newSource = new BitmapHolder(new byte[newWidth * newHeight * 4], newWidth, newHeight);
var oldw = source.Width;
// assigning pixels of destination image from source image
// with bilinear interpolation
for (i = 0; i < newHeight; ++i)
{
for (j = 0; j < newWidth; ++j)
{
// convert raster to Cartesian
x = j - iDestCentreX;
y = iDestCentreY - i;
// convert Cartesian to polar
fDistance = Math.Sqrt(x * x + y * y);
if (x == 0)
{
if (y == 0)
{
// center of image, no rotation needed
newSource.SetPixel(i * newWidth + j, source.GetPixelAsInt(iCentreY * oldw + iCentreX));
continue;
}
if (y < 0)
{
fPolarAngle = 1.5 * Math.PI;
}
else
{
fPolarAngle = 0.5 * Math.PI;
}
}
else
{
fPolarAngle = Math.Atan2(y, x);
}
// the crucial rotation part
// "reverse" rotate, so minus instead of plus
fPolarAngle -= cnAngle;
// convert polar to Cartesian
fTrueX = fDistance * Math.Cos(fPolarAngle);
fTrueY = fDistance * Math.Sin(fPolarAngle);
// convert Cartesian to raster
fTrueX = fTrueX + iCentreX;
fTrueY = iCentreY - fTrueY;
iFloorX = (int)(Math.Floor(fTrueX));
iFloorY = (int)(Math.Floor(fTrueY));
iCeilingX = (int)(Math.Ceiling(fTrueX));
iCeilingY = (int)(Math.Ceiling(fTrueY));
// check bounds
if (iFloorX < 0 || iCeilingX < 0 || iFloorX >= iWidth || iCeilingX >= iWidth || iFloorY < 0 ||
iCeilingY < 0 || iFloorY >= iHeight || iCeilingY >= iHeight)
continue;
fDeltaX = fTrueX - iFloorX;
fDeltaY = fTrueY - iFloorY;
var clrTopLeft = source.GetPixelAsInt(iFloorY * oldw + iFloorX);
var clrTopRight = source.GetPixelAsInt(iFloorY * oldw + iCeilingX);
var clrBottomLeft = source.GetPixelAsInt(iCeilingY * oldw + iFloorX);
var clrBottomRight = source.GetPixelAsInt(iCeilingY * oldw + iCeilingX);
fTopAlpha = (1 - fDeltaX) * ((clrTopLeft >> 24) & 0xFF) + fDeltaX * ((clrTopRight >> 24) & 0xFF);
fTopRed = (1 - fDeltaX) * ((clrTopLeft >> 16) & 0xFF) + fDeltaX * ((clrTopRight >> 16) & 0xFF);
fTopGreen = (1 - fDeltaX) * ((clrTopLeft >> 8) & 0xFF) + fDeltaX * ((clrTopRight >> 8) & 0xFF);
fTopBlue = (1 - fDeltaX) * (clrTopLeft & 0xFF) + fDeltaX * (clrTopRight & 0xFF);
// linearly interpolate horizontally between bottom neighbors
fBottomAlpha = (1 - fDeltaX) * ((clrBottomLeft >> 24) & 0xFF) + fDeltaX * ((clrBottomRight >> 24) & 0xFF);
fBottomRed = (1 - fDeltaX) * ((clrBottomLeft >> 16) & 0xFF) + fDeltaX * ((clrBottomRight >> 16) & 0xFF);
fBottomGreen = (1 - fDeltaX) * ((clrBottomLeft >> 8) & 0xFF) + fDeltaX * ((clrBottomRight >> 8) & 0xFF);
fBottomBlue = (1 - fDeltaX) * (clrBottomLeft & 0xFF) + fDeltaX * (clrBottomRight & 0xFF);
// linearly interpolate vertically between top and bottom interpolated results
iRed = (int)(Math.Round((1 - fDeltaY) * fTopRed + fDeltaY * fBottomRed));
iGreen = (int)(Math.Round((1 - fDeltaY) * fTopGreen + fDeltaY * fBottomGreen));
iBlue = (int)(Math.Round((1 - fDeltaY) * fTopBlue + fDeltaY * fBottomBlue));
iAlpha = (int)(Math.Round((1 - fDeltaY) * fTopAlpha + fDeltaY * fBottomAlpha));
// make sure color values are valid
if (iRed < 0) iRed = 0;
if (iRed > 255) iRed = 255;
if (iGreen < 0) iGreen = 0;
if (iGreen > 255) iGreen = 255;
if (iBlue < 0) iBlue = 0;
if (iBlue > 255) iBlue = 255;
if (iAlpha < 0) iAlpha = 0;
if (iAlpha > 255) iAlpha = 255;
var a = iAlpha + 1;
var val = (iAlpha << 24)
| ((byte)((iRed * a) >> 8) << 16)
| ((byte)((iGreen * a) >> 8) << 8)
| ((byte)((iBlue * a) >> 8));
newSource.SetPixel(i * newWidth + j, val);
}
}
return newSource;
}