public void ThenShouldReturnPointWithX2AndY2GivenCenterPoint25AndNegative25AndPointToRotateXAndY(
int pointToRotateX,
int pointToRotateY,
int expectedX,
int expectedY)
{
// Arrange
var pointToRotate = new Point(pointToRotateX, pointToRotateY);
// Act
var rotatePoint = ImageMaths.RotatePoint(pointToRotate, 90, new Point(25, -25));
// Assert
Assert.That(rotatePoint, Is.EqualTo(new Point(expectedX, expectedY)));
}
/// <summary>
/// The process image.
/// </summary>
/// <param name="factory">
/// The factory.
/// </param>
/// <returns>
/// The <see cref="Image"/>.
/// </returns>
/// <exception cref="ImageProcessingException">
/// </exception>
public Image ProcessImage(ImageFactory factory)
{
Bitmap cyan = null;
Bitmap magenta = null;
Bitmap yellow = null;
Bitmap keyline = null;
Bitmap newImage = null;
Image image = factory.Image;
try
{
int width = image.Width;
int height = image.Height;
// Angles taken from Wikipedia page.
float cyanAngle = 15f;
float magentaAngle = 75f;
float yellowAngle = 0f;
float keylineAngle = 45f;
int diameter = 4;
float multiplier = 4 * (float)Math.Sqrt(2);
// Cyan color sampled from Wikipedia page.
Brush cyanBrush = new SolidBrush(Color.FromArgb(0, 153, 239));
Brush magentaBrush = Brushes.Magenta;
Brush yellowBrush = Brushes.Yellow;
Brush keylineBrush;
// Create our images.
cyan = new Bitmap(width, height);
magenta = new Bitmap(width, height);
yellow = new Bitmap(width, height);
keyline = new Bitmap(width, height);
newImage = new Bitmap(width, height);
// Ensure the correct resolution is set.
cyan.SetResolution(image.HorizontalResolution, image.VerticalResolution);
magenta.SetResolution(image.HorizontalResolution, image.VerticalResolution);
yellow.SetResolution(image.HorizontalResolution, image.VerticalResolution);
keyline.SetResolution(image.HorizontalResolution, image.VerticalResolution);
newImage.SetResolution(image.HorizontalResolution, image.VerticalResolution);
// Check bounds against this.
Rectangle rectangle = new Rectangle(0, 0, width, height);
using (Graphics graphicsCyan = Graphics.FromImage(cyan))
using (Graphics graphicsMagenta = Graphics.FromImage(magenta))
using (Graphics graphicsYellow = Graphics.FromImage(yellow))
using (Graphics graphicsKeyline = Graphics.FromImage(keyline))
{
// Ensure cleared out.
graphicsCyan.Clear(Color.Transparent);
graphicsMagenta.Clear(Color.Transparent);
graphicsYellow.Clear(Color.Transparent);
graphicsKeyline.Clear(Color.Transparent);
// This is too slow. The graphics object can't be called within a parallel
// loop so we have to do it old school. :(
using (FastBitmap sourceBitmap = new FastBitmap(image))
{
for (int y = -height * 2; y < height * 2; y += diameter)
{
for (int x = -width * 2; x < width * 2; x += diameter)
{
Color color;
CmykColor cmykColor;
float brushWidth;
// Cyan
Point rotatedPoint = ImageMaths.RotatePoint(new Point(x, y), cyanAngle);
int angledX = rotatedPoint.X;
int angledY = rotatedPoint.Y;
if (rectangle.Contains(new Point(angledX, angledY)))
{
color = sourceBitmap.GetPixel(angledX, angledY);
cmykColor = color;
brushWidth = diameter * (cmykColor.C / 255f) * multiplier;
graphicsCyan.FillEllipse(cyanBrush, angledX, angledY, brushWidth, brushWidth);
}
// Magenta
rotatedPoint = ImageMaths.RotatePoint(new Point(x, y), magentaAngle);
angledX = rotatedPoint.X;
angledY = rotatedPoint.Y;
if (rectangle.Contains(new Point(angledX, angledY)))
{
color = sourceBitmap.GetPixel(angledX, angledY);
cmykColor = color;
brushWidth = diameter * (cmykColor.M / 255f) * multiplier;
graphicsMagenta.FillEllipse(magentaBrush, angledX, angledY, brushWidth, brushWidth);
}
// Yellow
rotatedPoint = ImageMaths.RotatePoint(new Point(x, y), yellowAngle);
angledX = rotatedPoint.X;
angledY = rotatedPoint.Y;
if (rectangle.Contains(new Point(angledX, angledY)))
{
color = sourceBitmap.GetPixel(angledX, angledY);
cmykColor = color;
brushWidth = diameter * (cmykColor.Y / 255f) * multiplier;
graphicsYellow.FillEllipse(yellowBrush, angledX, angledY, brushWidth, brushWidth);
}
// Keyline
rotatedPoint = ImageMaths.RotatePoint(new Point(x, y), keylineAngle);
angledX = rotatedPoint.X;
angledY = rotatedPoint.Y;
if (rectangle.Contains(new Point(angledX, angledY)))
{
color = sourceBitmap.GetPixel(angledX, angledY);
cmykColor = color;
brushWidth = diameter * (cmykColor.K / 255f) * multiplier;
// Just using blck is too dark.
keylineBrush = new SolidBrush(CmykColor.FromCmykColor(0, 0, 0, cmykColor.K));
graphicsKeyline.FillEllipse(keylineBrush, angledX, angledY, brushWidth, brushWidth);
}
}
}
}
// Set our white background.
using (Graphics graphics = Graphics.FromImage(newImage))
{
graphics.Clear(Color.White);
}
// Blend the colors now to mimic adaptive blending.
using (FastBitmap cyanBitmap = new FastBitmap(cyan))
using (FastBitmap magentaBitmap = new FastBitmap(magenta))
using (FastBitmap yellowBitmap = new FastBitmap(yellow))
using (FastBitmap keylineBitmap = new FastBitmap(keyline))
using (FastBitmap destinationBitmap = new FastBitmap(newImage))
{
Parallel.For(
0,
height,
y =>
{
for (int x = 0; x < width; x++)
{
// ReSharper disable AccessToDisposedClosure
Color cyanPixel = cyanBitmap.GetPixel(x, y);
Color magentaPixel = magentaBitmap.GetPixel(x, y);
Color yellowPixel = yellowBitmap.GetPixel(x, y);
Color keylinePixel = keylineBitmap.GetPixel(x, y);
CmykColor blended = cyanPixel.AddAsCmykColor(magentaPixel, yellowPixel, keylinePixel);
destinationBitmap.SetPixel(x, y, blended);
// ReSharper restore AccessToDisposedClosure
}
});
}
}
cyan.Dispose();
magenta.Dispose();
yellow.Dispose();
keyline.Dispose();
image.Dispose();
image = newImage;
}
catch (Exception ex)
{
if (cyan != null)
{
cyan.Dispose();
}
if (magenta != null)
{
magenta.Dispose();
}
if (yellow != null)
{
yellow.Dispose();
}
if (keyline != null)
{
keyline.Dispose();
}
if (newImage != null)
{
newImage.Dispose();
}
throw new ImageProcessingException("Error processing image with " + this.GetType().Name, ex);
}
return(image);
}
/// <summary>
/// Applies the halftone filter.
/// </summary>
/// <param name="source">
/// The <see cref="Bitmap"/> to apply the filter to.
/// </param>
/// <returns>
/// The <see cref="Bitmap"/> with the filter applied.
/// </returns>
public Bitmap ApplyFilter(Bitmap source)
{
// TODO: Make this class implement an interface?
Bitmap padded = null;
Bitmap cyan = null;
Bitmap magenta = null;
Bitmap yellow = null;
Bitmap keyline = null;
Bitmap newImage = null;
try
{
int sourceWidth = source.Width;
int sourceHeight = source.Height;
int width = source.Width + this.distance;
int height = source.Height + this.distance;
// Draw a slightly larger image, flipping the top/left pixels to prevent
// jagged edge of output.
padded = new Bitmap(width, height, PixelFormat.Format32bppPArgb);
padded.SetResolution(source.HorizontalResolution, source.VerticalResolution);
using (Graphics graphicsPadded = Graphics.FromImage(padded))
{
graphicsPadded.Clear(Color.White);
Rectangle destinationRectangle = new Rectangle(0, 0, sourceWidth + this.distance, source.Height + this.distance);
using (TextureBrush tb = new TextureBrush(source))
{
tb.WrapMode = WrapMode.TileFlipXY;
tb.TranslateTransform(this.distance, this.distance);
graphicsPadded.FillRectangle(tb, destinationRectangle);
}
}
// Calculate min and max widths/heights.
Rectangle rotatedBounds = this.GetBoundingRectangle(width, height);
int minY = -(rotatedBounds.Height + height);
int maxY = rotatedBounds.Height + height;
int minX = -(rotatedBounds.Width + width);
int maxX = rotatedBounds.Width + width;
Point center = Point.Empty;
// Yellow oversaturates the output.
int offset = this.distance;
float yellowMultiplier = this.distance * 1.587f;
float magentaMultiplier = this.distance * 2.176f;
float multiplier = this.distance * 2.2f;
float max = this.distance * (float)Math.Sqrt(2);
float magentaMax = this.distance * (float)Math.Sqrt(1.4545);
// Bump up the keyline max so that black looks black.
float keylineMax = max * (float)Math.Sqrt(2);
// Color sampled process colours from Wikipedia pages.
// Keyline brush is declared separately.
Brush cyanBrush = new SolidBrush(Color.FromArgb(0, 183, 235));
Brush magentaBrush = new SolidBrush(Color.FromArgb(255, 0, 144));
Brush yellowBrush = new SolidBrush(Color.FromArgb(255, 239, 0));
// Create our images.
cyan = new Bitmap(width, height, PixelFormat.Format32bppPArgb);
magenta = new Bitmap(width, height, PixelFormat.Format32bppPArgb);
yellow = new Bitmap(width, height, PixelFormat.Format32bppPArgb);
keyline = new Bitmap(width, height, PixelFormat.Format32bppPArgb);
newImage = new Bitmap(sourceWidth, sourceHeight, PixelFormat.Format32bppPArgb);
// Ensure the correct resolution is set.
cyan.SetResolution(source.HorizontalResolution, source.VerticalResolution);
magenta.SetResolution(source.HorizontalResolution, source.VerticalResolution);
yellow.SetResolution(source.HorizontalResolution, source.VerticalResolution);
keyline.SetResolution(source.HorizontalResolution, source.VerticalResolution);
newImage.SetResolution(source.HorizontalResolution, source.VerticalResolution);
// Check bounds against this.
Rectangle rectangle = new Rectangle(0, 0, width, height);
using (Graphics graphicsCyan = Graphics.FromImage(cyan))
using (Graphics graphicsMagenta = Graphics.FromImage(magenta))
using (Graphics graphicsYellow = Graphics.FromImage(yellow))
using (Graphics graphicsKeyline = Graphics.FromImage(keyline))
{
// Set the quality properties.
graphicsCyan.PixelOffsetMode = PixelOffsetMode.Half;
graphicsMagenta.PixelOffsetMode = PixelOffsetMode.Half;
graphicsYellow.PixelOffsetMode = PixelOffsetMode.Half;
graphicsKeyline.PixelOffsetMode = PixelOffsetMode.Half;
graphicsCyan.SmoothingMode = SmoothingMode.AntiAlias;
graphicsMagenta.SmoothingMode = SmoothingMode.AntiAlias;
graphicsYellow.SmoothingMode = SmoothingMode.AntiAlias;
graphicsKeyline.SmoothingMode = SmoothingMode.AntiAlias;
graphicsCyan.CompositingQuality = CompositingQuality.HighQuality;
graphicsMagenta.CompositingQuality = CompositingQuality.HighQuality;
graphicsYellow.CompositingQuality = CompositingQuality.HighQuality;
graphicsKeyline.CompositingQuality = CompositingQuality.HighQuality;
// Set up the canvas.
graphicsCyan.Clear(Color.White);
graphicsMagenta.Clear(Color.White);
graphicsYellow.Clear(Color.White);
graphicsKeyline.Clear(Color.White);
// This is too slow. The graphics object can't be called within a parallel
// loop so we have to do it old school. :(
using (FastBitmap sourceBitmap = new FastBitmap(padded))
{
for (int y = minY; y < maxY; y += offset)
{
for (int x = minX; x < maxX; x += offset)
{
Color color;
CmykColor cmykColor;
float brushWidth;
// Cyan
Point rotatedPoint = ImageMaths.RotatePoint(new Point(x, y), this.cyanAngle, center);
int angledX = rotatedPoint.X;
int angledY = rotatedPoint.Y;
if (rectangle.Contains(new Point(angledX, angledY)))
{
color = sourceBitmap.GetPixel(angledX, angledY);
cmykColor = color;
brushWidth = Math.Min((cmykColor.C / 100f) * multiplier, max);
graphicsCyan.FillEllipse(cyanBrush, angledX, angledY, brushWidth, brushWidth);
}
// Magenta
rotatedPoint = ImageMaths.RotatePoint(new Point(x, y), this.magentaAngle, center);
angledX = rotatedPoint.X;
angledY = rotatedPoint.Y;
if (rectangle.Contains(new Point(angledX, angledY)))
{
color = sourceBitmap.GetPixel(angledX, angledY);
cmykColor = color;
brushWidth = Math.Min((cmykColor.M / 100f) * magentaMultiplier, magentaMax);
graphicsMagenta.FillEllipse(magentaBrush, angledX, angledY, brushWidth, brushWidth);
}
// Yellow
rotatedPoint = ImageMaths.RotatePoint(new Point(x, y), this.yellowAngle, center);
angledX = rotatedPoint.X;
angledY = rotatedPoint.Y;
if (rectangle.Contains(new Point(angledX, angledY)))
{
color = sourceBitmap.GetPixel(angledX, angledY);
cmykColor = color;
brushWidth = Math.Min((cmykColor.Y / 100f) * yellowMultiplier, max);
graphicsYellow.FillEllipse(yellowBrush, angledX, angledY, brushWidth, brushWidth);
}
// Keyline
rotatedPoint = ImageMaths.RotatePoint(new Point(x, y), this.keylineAngle, center);
angledX = rotatedPoint.X;
angledY = rotatedPoint.Y;
if (rectangle.Contains(new Point(angledX, angledY)))
{
color = sourceBitmap.GetPixel(angledX, angledY);
cmykColor = color;
brushWidth = Math.Min((cmykColor.K / 100f) * multiplier, keylineMax);
// Just using black is too dark.
Brush keylineBrush = new SolidBrush(CmykColor.FromCmykColor(0, 0, 0, cmykColor.K));
graphicsKeyline.FillEllipse(keylineBrush, angledX, angledY, brushWidth, brushWidth);
}
}
}
}
// Set our white background.
using (Graphics graphics = Graphics.FromImage(newImage))
{
graphics.Clear(Color.White);
}
// Blend the colors now to mimic adaptive blending.
using (FastBitmap cyanBitmap = new FastBitmap(cyan))
using (FastBitmap magentaBitmap = new FastBitmap(magenta))
using (FastBitmap yellowBitmap = new FastBitmap(yellow))
using (FastBitmap keylineBitmap = new FastBitmap(keyline))
using (FastBitmap destinationBitmap = new FastBitmap(newImage))
{
Parallel.For(
offset,
height,
y =>
{
for (int x = offset; x < width; x++)
{
// ReSharper disable AccessToDisposedClosure
Color cyanPixel = cyanBitmap.GetPixel(x, y);
Color magentaPixel = magentaBitmap.GetPixel(x, y);
Color yellowPixel = yellowBitmap.GetPixel(x, y);
Color keylinePixel = keylineBitmap.GetPixel(x, y);
// Negate the offset.
int xBack = x - offset;
int yBack = y - offset;
CmykColor blended = cyanPixel.AddAsCmykColor(magentaPixel, yellowPixel, keylinePixel);
if (rectangle.Contains(new Point(xBack, yBack)))
{
destinationBitmap.SetPixel(xBack, yBack, blended);
}
// ReSharper restore AccessToDisposedClosure
}
});
}
}
padded.Dispose();
cyan.Dispose();
magenta.Dispose();
yellow.Dispose();
keyline.Dispose();
source.Dispose();
source = newImage;
}
catch
{
if (padded != null)
{
padded.Dispose();
}
if (cyan != null)
{
cyan.Dispose();
}
if (magenta != null)
{
magenta.Dispose();
}
if (yellow != null)
{
yellow.Dispose();
}
if (keyline != null)
{
keyline.Dispose();
}
if (newImage != null)
{
newImage.Dispose();
}
}
return(source);
}
/// <summary>
/// Applies the halftone filter.
/// </summary>
/// <param name="source">
/// The <see cref="Bitmap"/> to apply the filter to.
/// </param>
/// <returns>
/// The <see cref="Bitmap"/> with the filter applied.
/// </returns>
public Bitmap ApplyFilter(Bitmap source)
{
// TODO: Make this class implement an interface?
Bitmap cyan = null;
Bitmap magenta = null;
Bitmap yellow = null;
Bitmap keyline = null;
Bitmap newImage = null;
try
{
int width = source.Width;
int height = source.Height;
// Calculate min and max widths/heights.
Rectangle rotatedBounds = this.GetBoundingRectangle(width, height);
int minY = -(rotatedBounds.Height + height);
int maxY = rotatedBounds.Height + height;
int minX = -(rotatedBounds.Width + width);
int maxX = rotatedBounds.Width + width;
Point center = Point.Empty;
// Yellow oversaturates the output.
const float YellowMultiplier = 4;
float multiplier = YellowMultiplier * (float)Math.Sqrt(2);
float max = this.distance;
// Bump up the keyline max so that black looks black.
float keylineMax = max + ((float)Math.Sqrt(2) * 1.44f);
// Color sampled process colours from Wikipedia pages.
// Keyline brush is declared separately.
Brush cyanBrush = new SolidBrush(Color.FromArgb(0, 183, 235));
Brush magentaBrush = new SolidBrush(Color.FromArgb(255, 0, 144));
Brush yellowBrush = new SolidBrush(Color.FromArgb(255, 239, 0));
// Create our images.
cyan = new Bitmap(width, height);
magenta = new Bitmap(width, height);
yellow = new Bitmap(width, height);
keyline = new Bitmap(width, height);
newImage = new Bitmap(width, height);
// Ensure the correct resolution is set.
cyan.SetResolution(source.HorizontalResolution, source.VerticalResolution);
magenta.SetResolution(source.HorizontalResolution, source.VerticalResolution);
yellow.SetResolution(source.HorizontalResolution, source.VerticalResolution);
keyline.SetResolution(source.HorizontalResolution, source.VerticalResolution);
newImage.SetResolution(source.HorizontalResolution, source.VerticalResolution);
// Check bounds against this.
Rectangle rectangle = new Rectangle(0, 0, width, height);
using (Graphics graphicsCyan = Graphics.FromImage(cyan))
using (Graphics graphicsMagenta = Graphics.FromImage(magenta))
using (Graphics graphicsYellow = Graphics.FromImage(yellow))
using (Graphics graphicsKeyline = Graphics.FromImage(keyline))
{
// Set the quality properties.
graphicsCyan.PixelOffsetMode = PixelOffsetMode.HighQuality;
graphicsMagenta.PixelOffsetMode = PixelOffsetMode.HighQuality;
graphicsYellow.PixelOffsetMode = PixelOffsetMode.HighQuality;
graphicsKeyline.PixelOffsetMode = PixelOffsetMode.HighQuality;
// Set up the canvas.
graphicsCyan.Clear(Color.Transparent);
graphicsMagenta.Clear(Color.Transparent);
graphicsYellow.Clear(Color.Transparent);
graphicsKeyline.Clear(Color.Transparent);
int d = this.distance;
// This is too slow. The graphics object can't be called within a parallel
// loop so we have to do it old school. :(
using (FastBitmap sourceBitmap = new FastBitmap(source))
{
for (int y = minY; y < maxY; y += d)
{
for (int x = minX; x < maxX; x += d)
{
Color color;
CmykColor cmykColor;
float brushWidth;
int offsetX = x - (d >> 1);
int offsetY = y - (d >> 1);
// Cyan
Point rotatedPoint = ImageMaths.RotatePoint(new Point(offsetX, offsetY), this.cyanAngle, center);
int angledX = rotatedPoint.X;
int angledY = rotatedPoint.Y;
if (rectangle.Contains(new Point(angledX, angledY)))
{
color = sourceBitmap.GetPixel(angledX, angledY);
cmykColor = color;
brushWidth = ImageMaths.Clamp(d * (cmykColor.C / 255f) * multiplier, 0, max);
graphicsCyan.FillEllipse(cyanBrush, angledX, angledY, brushWidth, brushWidth);
}
// Magenta
rotatedPoint = ImageMaths.RotatePoint(new Point(offsetX, offsetY), this.magentaAngle, center);
angledX = rotatedPoint.X;
angledY = rotatedPoint.Y;
if (rectangle.Contains(new Point(angledX, angledY)))
{
color = sourceBitmap.GetPixel(angledX, angledY);
cmykColor = color;
brushWidth = ImageMaths.Clamp(d * (cmykColor.M / 255f) * multiplier, 0, max);
graphicsMagenta.FillEllipse(magentaBrush, angledX, angledY, brushWidth, brushWidth);
}
// Yellow
rotatedPoint = ImageMaths.RotatePoint(new Point(offsetX, offsetY), this.yellowAngle, center);
angledX = rotatedPoint.X;
angledY = rotatedPoint.Y;
if (rectangle.Contains(new Point(angledX, angledY)))
{
color = sourceBitmap.GetPixel(angledX, angledY);
cmykColor = color;
brushWidth = ImageMaths.Clamp(d * (cmykColor.Y / 255f) * YellowMultiplier, 0, max);
graphicsYellow.FillEllipse(yellowBrush, angledX, angledY, brushWidth, brushWidth);
}
// Keyline
rotatedPoint = ImageMaths.RotatePoint(new Point(offsetX, offsetY), this.keylineAngle, center);
angledX = rotatedPoint.X;
angledY = rotatedPoint.Y;
if (rectangle.Contains(new Point(angledX, angledY)))
{
color = sourceBitmap.GetPixel(angledX, angledY);
cmykColor = color;
brushWidth = ImageMaths.Clamp(d * (cmykColor.K / 255f) * multiplier, 0, keylineMax);
// Just using black is too dark.
Brush keylineBrush = new SolidBrush(CmykColor.FromCmykColor(0, 0, 0, cmykColor.K));
graphicsKeyline.FillEllipse(keylineBrush, angledX, angledY, brushWidth, brushWidth);
}
}
}
}
// Set our white background.
using (Graphics graphics = Graphics.FromImage(newImage))
{
graphics.Clear(Color.White);
}
// Blend the colors now to mimic adaptive blending.
using (FastBitmap cyanBitmap = new FastBitmap(cyan))
using (FastBitmap magentaBitmap = new FastBitmap(magenta))
using (FastBitmap yellowBitmap = new FastBitmap(yellow))
using (FastBitmap keylineBitmap = new FastBitmap(keyline))
using (FastBitmap destinationBitmap = new FastBitmap(newImage))
{
Parallel.For(
0,
height,
y =>
{
for (int x = 0; x < width; x++)
{
// ReSharper disable AccessToDisposedClosure
Color cyanPixel = cyanBitmap.GetPixel(x, y);
Color magentaPixel = magentaBitmap.GetPixel(x, y);
Color yellowPixel = yellowBitmap.GetPixel(x, y);
Color keylinePixel = keylineBitmap.GetPixel(x, y);
CmykColor blended = cyanPixel.AddAsCmykColor(magentaPixel, yellowPixel, keylinePixel);
if (rectangle.Contains(new Point(x, y)))
{
destinationBitmap.SetPixel(x, y, blended);
}
// ReSharper restore AccessToDisposedClosure
}
});
}
}
cyan.Dispose();
magenta.Dispose();
yellow.Dispose();
keyline.Dispose();
source.Dispose();
source = newImage;
}
catch
{
if (cyan != null)
{
cyan.Dispose();
}
if (magenta != null)
{
magenta.Dispose();
}
if (yellow != null)
{
yellow.Dispose();
}
if (keyline != null)
{
keyline.Dispose();
}
if (newImage != null)
{
newImage.Dispose();
}
}
return(source);
}