/// <summary>
/// Rotates the image 270 degrees clockwise at the centre point.
/// </summary>
/// <param name="target">The target image.</param>
/// <param name="source">The source image.</param>
private void Rotate270(ImageBase <T, TP> target, ImageBase <T, TP> source)
{
int width = source.Width;
int height = source.Height;
Image <T, TP> temp = new Image <T, TP>(height, width);
using (IPixelAccessor <T, TP> sourcePixels = source.Lock())
using (IPixelAccessor <T, TP> tempPixels = temp.Lock())
{
Parallel.For(
0,
height,
this.ParallelOptions,
y =>
{
for (int x = 0; x < width; x++)
{
int newX = height - y - 1;
newX = height - newX - 1;
int newY = width - x - 1;
tempPixels[newX, newY] = sourcePixels[x, y];
}
this.OnRowProcessed();
});
}
target.SetPixels(height, width, temp.Pixels);
}
/// <inheritdoc/>
protected override void Apply(ImageBase target, ImageBase source, Rectangle targetRectangle, Rectangle sourceRectangle, int startY, int endY)
{
if (source.Bounds == target.Bounds)
{
target.SetPixels(target.Width, target.Height, source.Pixels);
return;
}
int targetY = this.cropRectangle.Y;
int startX = targetRectangle.X;
int targetX = this.cropRectangle.X;
int endX = this.cropRectangle.Width;
int maxX = endX - 1;
int maxY = this.cropRectangle.Bottom - 1;
Parallel.For(
startY,
endY,
y =>
{
for (int x = startX; x < endX; x++)
{
int offsetY = y + targetY;
offsetY = offsetY.Clamp(0, maxY);
int offsetX = x + targetX;
offsetX = offsetX.Clamp(0, maxX);
target[x, y] = source[offsetX, offsetY];
}
this.OnRowProcessed();
});
}
public virtual void Sample(ImageBase source, ImageBase target, int width, int height)
{
byte[] pixels = new byte[width * height * 4];
if (Parallelism > 1)
{
int partitionCount = Parallelism;
Task[] tasks = new Task[partitionCount];
for (int p = 0; p < partitionCount; p++)
{
int current = p;
tasks[p] = Task.Run(() =>
{
int batchSize = height / partitionCount;
int yBegin = current * batchSize;
int yEnd = (current == partitionCount - 1 ? height : yBegin + batchSize);
Sample(source, width, height, yBegin, yEnd, pixels);
});
}
Task.WaitAll(tasks);
}
else
{
Sample(source, width, height, 0, height, pixels);
}
target.SetPixels(width, height, pixels);
}
/// <summary>
/// Creates a new target to contain the results of the matrix transform.
/// </summary>
/// <param name="target">Target image to apply the process to.</param>
/// <param name="sourceRectangle">The source rectangle.</param>
/// <param name="processMatrix">The processing matrix.</param>
protected static void CreateNewTarget(ImageBase <TColor, TPacked> target, Rectangle sourceRectangle, Matrix3x2 processMatrix)
{
Matrix3x2 sizeMatrix;
if (Matrix3x2.Invert(processMatrix, out sizeMatrix))
{
Rectangle rectangle = ImageMaths.GetBoundingRectangle(sourceRectangle, sizeMatrix);
target.SetPixels(rectangle.Width, rectangle.Height, new TColor[rectangle.Width * rectangle.Height]);
}
}
public void Resize(ImageBase source, ImageBase target, int width, int height)
{
byte[] newPixels = new byte[width * height * 4];
double xFactor = (double)source.PixelWidth / width;
double yFactor = (double)source.PixelHeight / height;
int dstOffsetLine = 0;
int dstOffset = 0;
int srcOffsetLine = 0;
int srcOffset = 0;
byte[] sourcePixels = source.Pixels;
for (int y = 0; y < height; y++)
{
dstOffsetLine = 4 * width * y;
// Calculate the line offset at the source image, where the pixels should be get from.
srcOffsetLine = 4 * source.PixelWidth * (int)(y * yFactor);
for (int x = 0; x < width; x++)
{
dstOffset = dstOffsetLine + 4 * x;
srcOffset = srcOffsetLine + 4 * (int)(x * xFactor);
newPixels[dstOffset + 0] = sourcePixels[srcOffset + 0];
newPixels[dstOffset + 1] = sourcePixels[srcOffset + 1];
newPixels[dstOffset + 2] = sourcePixels[srcOffset + 2];
newPixels[dstOffset + 3] = sourcePixels[srcOffset + 3];
}
}
target.SetPixels(width, height, newPixels);
}
private void ConvertFromYCbCr(int imageWidth, int imageHeight, ImageBase image)
{
int scale = comp[0].h/comp[1].h;
Color2[] pixels = new Color2[imageWidth*imageHeight];
Parallel.For(0, imageHeight, Bootstrapper.instance.ParallelOptions, y =>{
int yo = ycbcrImage.get_row_y_offset(y);
int co = ycbcrImage.get_row_c_offset(y);
for (int x = 0; x < imageWidth; x++){
byte yy = ycbcrImage.pix_y[yo + x];
byte cb = ycbcrImage.pix_cb[co + (x/scale)];
byte cr = ycbcrImage.pix_cr[co + (x/scale)];
int index = y*imageWidth + x;
Color2 color = new YCbCr2(yy, cb, cr);
Color2 packed = Color2.FromArgb(color.A, color.R, color.G, color.B);
pixels[index] = packed;
}
});
image.SetPixels(imageWidth, imageHeight, pixels);
AssignResolution(image);
}
private void ConvertFromRgb(int imageWidth, int imageHeight, ImageBase image)
{
int scale = comp[0].h/comp[1].h;
Color2[] pixels = new Color2[imageWidth*imageHeight];
Parallel.For(0, imageHeight, Bootstrapper.instance.ParallelOptions, y =>{
int yo = ycbcrImage.get_row_y_offset(y);
int co = ycbcrImage.get_row_c_offset(y);
for (int x = 0; x < imageWidth; x++){
byte red = ycbcrImage.pix_y[yo + x];
byte green = ycbcrImage.pix_cb[co + (x/scale)];
byte blue = ycbcrImage.pix_cr[co + (x/scale)];
int index = (y*imageWidth) + x;
Color2 packed = Color2.FromArgb(red, green, blue);
pixels[index] = packed;
}
});
image.SetPixels(imageWidth, imageHeight, pixels);
AssignResolution(image);
}
private void ConvertFromGrayScale(int imageWidth, int imageHeight, ImageBase image)
{
Color2[] pixels = new Color2[imageWidth*imageHeight];
Parallel.For(0, imageHeight, Bootstrapper.instance.ParallelOptions, y =>{
int yoff = grayImage.GetRowOffset(y);
for (int x = 0; x < imageWidth; x++){
int offset = (y*imageWidth) + x;
byte rgb = grayImage.pixels[yoff + x];
Color2 packed = Color2.FromArgb(rgb, rgb, rgb);
pixels[offset] = packed;
}
});
image.SetPixels(imageWidth, imageHeight, pixels);
AssignResolution(image);
}
/// <inheritdoc/>
protected override void OnApply(ImageBase source, ImageBase target, Rectangle targetRectangle, Rectangle sourceRectangle)
{
ImageBase temp = new Image(source.Width, source.Height);
// Detect the edges.
new Sobel().Apply(temp, source, sourceRectangle);
// Apply threshold binarization filter.
new Threshold(.5f).Apply(temp, temp, sourceRectangle);
// Search for the first white pixels
Rectangle rectangle = ImageMaths.GetFilteredBoundingRectangle(temp, 0);
// Reset the target pixel to the correct size.
target.SetPixels(rectangle.Width, rectangle.Height, new float[rectangle.Width * rectangle.Height * 4]);
this.cropRectangle = rectangle;
}
public void Resize(ImageBase source, ImageBase target, int width, int height)
{
byte[] newPixels = new byte[width * height * 4];
byte[] sourcePixels = source.Pixels;
var GetColor = new Func<double, double, int, byte>((x, y, offset) => sourcePixels[(int)((y * source.PixelWidth + x) * 4 + offset)]);
double factorX = (double)source.PixelWidth / width;
double factorY = (double)source.PixelHeight / height;
double fractionX, oneMinusX, l, r;
double fractionY, oneMinusY, t, b;
byte c1, c2, c3, c4, b1, b2;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
int dstOffset = (y * width + x) * 4;
l = (int)Math.Floor(x * factorX);
t = (int)Math.Floor(y * factorY);
r = l + 1;
b = t + 1;
if (r >= source.PixelWidth)
{
r = l;
}
if (b >= source.PixelHeight)
{
b = t;
}
fractionX = x * factorX - l;
fractionY = y * factorY - t;
oneMinusX = 1.0 - fractionX;
oneMinusY = 1.0 - fractionY;
var function = new Func<int, byte>(offset =>
{
c1 = GetColor(l, t, offset);
c2 = GetColor(r, t, offset);
c3 = GetColor(l, b, offset);
c4 = GetColor(r, b, offset);
b1 = (byte)(oneMinusX * c1 + fractionX * c2);
b2 = (byte)(oneMinusX * c3 + fractionX * c4);
return (byte)(oneMinusY * b1 + fractionY * b2);
});
newPixels[dstOffset + 0] = function(0);
newPixels[dstOffset + 1] = function(1);
newPixels[dstOffset + 2] = function(2);
newPixels[dstOffset + 3] = 255;
}
}
target.SetPixels(width, height, newPixels);
}
/// <inheritdoc/>
protected override void OnApply(ImageBase <TColor, TPacked> source, Rectangle sourceRectangle)
{
float[][] kernelX = this.KernelXY;
int kernelLength = kernelX.GetLength(0);
int radius = kernelLength >> 1;
int startY = sourceRectangle.Y;
int endY = sourceRectangle.Bottom;
int startX = sourceRectangle.X;
int endX = sourceRectangle.Right;
int maxY = endY - 1;
int maxX = endX - 1;
TColor[] target = new TColor[source.Width * source.Height];
using (PixelAccessor <TColor, TPacked> sourcePixels = source.Lock())
using (PixelAccessor <TColor, TPacked> targetPixels = target.Lock <TColor, TPacked>(source.Width, source.Height))
{
Parallel.For(
startY,
endY,
this.ParallelOptions,
y =>
{
for (int x = startX; x < endX; x++)
{
float rX = 0;
float gX = 0;
float bX = 0;
// Apply each matrix multiplier to the color components for each pixel.
for (int fy = 0; fy < kernelLength; fy++)
{
int fyr = fy - radius;
int offsetY = y + fyr;
offsetY = offsetY.Clamp(0, maxY);
for (int fx = 0; fx < kernelLength; fx++)
{
int fxr = fx - radius;
int offsetX = x + fxr;
offsetX = offsetX.Clamp(0, maxX);
Vector4 currentColor = sourcePixels[offsetX, offsetY].ToVector4();
float r = currentColor.X;
float g = currentColor.Y;
float b = currentColor.Z;
rX += kernelX[fy][fx] * r;
gX += kernelX[fy][fx] * g;
bX += kernelX[fy][fx] * b;
}
}
float red = rX;
float green = gX;
float blue = bX;
TColor packed = default(TColor);
packed.PackFromVector4(new Vector4(red, green, blue, sourcePixels[x, y].ToVector4().W));
targetPixels[x, y] = packed;
}
});
}
source.SetPixels(source.Width, source.Height, target);
}
