private void TransformPerPixelBase(ImageBuffer target, IList<Point> path = null, Int32 parallelTaskCount = 4, params Delegate[] passes)
{
// checks parameters
Guard.CheckNull(target, "target");
Guard.CheckNull(passes, "passes");
// creates internal quantizer if needed
UpdatePalette();
target.UpdatePalette();
// checks the dimensions
if (Width != target.Width || Height != target.Height)
{
const String message = "Both images have to have the same dimensions.";
throw new ArgumentOutOfRangeException(message);
}
// determines mode
Boolean isAdvanced = passes.Length > 0 && passes[0] is TransformPixelAdvancedFunction;
// creates default path, if none is available
if (path == null) path = StandardPathProvider.CreatePath(Width, Height);
// process the image in a parallel manner
Action<LineTask> transformPerPixel = lineTask =>
{
// creates individual pixel structures per task
Pixel sourcePixel = CreatePixel();
Pixel targetPixel = target.CreatePixel();
Delegate pass = passes[lineTask.PassIndex];
// enumerates the pixels row by row
for (Int32 pathOffset = lineTask.StartOffset; pathOffset < lineTask.EndOffset; pathOffset++)
{
Point point = path[pathOffset];
Boolean allowWrite;
// enumerates the pixel, and returns the control to the outside
sourcePixel.Update(point.X, point.Y);
targetPixel.Update(point.X, point.Y);
// when read is allowed, retrieves current value (in bytes)
if (CanRead) ReadPixel(sourcePixel);
if (target.CanRead) target.ReadPixel(targetPixel);
// process the pixel by custom user operation
if (isAdvanced)
{
TransformPixelAdvancedFunction transformAdvancedFunction = (TransformPixelAdvancedFunction) pass;
allowWrite = transformAdvancedFunction(lineTask.PassIndex, sourcePixel, targetPixel, this, target);
}
else // use simplified version with pixel parameters only
{
TransformPixelFunction transformFunction = (TransformPixelFunction) pass;
allowWrite = transformFunction(lineTask.PassIndex, sourcePixel, targetPixel);
}
// when write is allowed, copies the value back to the row buffer
if (target.CanWrite && allowWrite) target.WritePixel(targetPixel);
}
};
// transforms image per pixel
for (Int32 passIndex = 0; passIndex < passes.Length; passIndex++)
{
ProcessInParallel(passIndex, transformPerPixel, path, parallelTaskCount);
}
}
public void TransformPerPixelAdvanced(PixelFormat targetFormat, List<Color> palette, out Image targetImage, IList<Point> path = null, Int32 parallelTaskCount = 4, params TransformPixelAdvancedFunction[] passes)
{
// checks parameters
Guard.CheckNull(targetFormat, "targetFormat");
// creates a target bitmap in an appropriate format
targetImage = new Bitmap(Width, Height, targetFormat);
// sets image palette if needed
if (targetFormat.IsIndexed()) targetImage.SetPalette(palette);
// wraps target image to a buffer
using (ImageBuffer target = new ImageBuffer(targetImage, ImageLockMode.WriteOnly))
{
TransformPerPixelBase(target, path, parallelTaskCount, passes);
}
}
internal void DrawEllipse(Pen pen, int x, int y, int width, int height)
{
var ellipsePixels = DrawEllipseCentered(_bitmap.Width, _bitmap.Height, x + width / 2, y + height / 2, width / 2,
height / 2);
var color = pen.Color;
if (_dummyImageBuffer == null)
_dummyImageBuffer = new ImageBuffer(new Bitmap(_bitmap.Width, _bitmap.Height, _bitmap.PixelFormat),
ImageLockMode.ReadOnly);
_dummyImageBuffer.TransformPerPixel(null, ref _bitmap,
ellipsePixels.Select(idx => new Point(idx % _bitmap.Width, idx / _bitmap.Width)).ToList(), ParallelTaskCount,
(passIndex, sourcePixel, targetPixel) =>
{
targetPixel.SetColor(color, _quantizer);
return true;
});
}
public void Dither(ImageBuffer target, IColorDitherer ditherer, IColorQuantizer quantizer, Int32 colorCount, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(target, "target");
Guard.CheckNull(ditherer, "ditherer");
Guard.CheckNull(quantizer, "quantizer");
// prepares ditherer for another round
ditherer.Prepare(quantizer, colorCount, this, target);
// processes the image via the ditherer
IList<Point> path = ditherer.GetPointPath(Width, Height);
TransformPerPixel(target, path, parallelTaskCount, ditherer.ProcessPixel);
}
public void Quantize(ImageBuffer target, IColorQuantizer quantizer, IColorDitherer ditherer, Int32 colorCount, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(target, "target");
Guard.CheckNull(quantizer, "quantizer");
// initializes quantization parameters
Boolean isTargetIndexed = target.PixelFormat.IsIndexed();
// prepares the palette if needed
List<Color> targetPalette = isTargetIndexed ? SynthetizePalette(quantizer, colorCount, parallelTaskCount) : null;
// updates the bitmap palette
target.bitmap.SetPalette(targetPalette);
target.UpdatePalette(true);
// prepares ditherer (optional)
if (ditherer != null) ditherer.Prepare(quantizer, colorCount, this, target);
// prepares the quantization function
TransformPixelFunction quantize = (passIndex, sourcePixel, targetPixel) =>
{
// reads the pixel color
Color color = sourcePixel.GetColor();
// converts alpha to solid color
color = QuantizationHelper.ConvertAlpha(color);
// quantizes the pixel
targetPixel.SetColor(color, quantizer);
// marks pixel as processed by default
Boolean result = true;
// preforms inplace dithering (optional)
if (ditherer != null && ditherer.IsInplace)
{
result = ditherer.ProcessPixel(passIndex, sourcePixel, targetPixel);
}
// returns the result
return result;
};
// generates the target image
IList<Point> path = quantizer.GetPointPath(Width, Height);
TransformPerPixelBase(target, path, parallelTaskCount, quantize);
// preforms non-inplace dithering (optional)
if (ditherer != null && !ditherer.IsInplace)
{
Dither(target, ditherer, quantizer, colorCount, 1);
}
// finishes the dithering (optional)
if (ditherer != null) ditherer.Finish();
// cleans up the quantizer
quantizer.Finish();
}
public static void TransformImagePerPixelAdvanced(Image sourceImage, PixelFormat targetFormat, List<Color> palette, out Image targetImage, IList<Point> path = null, Int32 parallelTaskCount = 4, params TransformPixelAdvancedFunction[] passes)
{
// checks parameters
Guard.CheckNull(sourceImage, "sourceImage");
// wraps source image to a buffer
using (ImageBuffer source = new ImageBuffer(sourceImage, ImageLockMode.ReadWrite))
{
source.TransformPerPixelAdvanced(targetFormat, palette, out targetImage, path, parallelTaskCount, passes);
}
}
public Double CalculateNormalizedMeanError(ImageBuffer target, Int32 parallelTaskCount = 4)
{
return CalculateMeanError(target, parallelTaskCount) / 255.0;
}
public static void DitherImage(ImageBuffer source, ImageBuffer target, IColorDitherer ditherer, IColorQuantizer quantizer, Int32 colorCount, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(source, "source");
// use other override to calculate error
source.Dither(target, ditherer, quantizer, colorCount, parallelTaskCount);
}
public static void DitherImage(Image sourceImage, Image targetImage, IColorDitherer ditherer, IColorQuantizer quantizer, Int32 colorCount, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(sourceImage, "sourceImage");
Guard.CheckNull(targetImage, "targetImage");
// wraps source image to a buffer
using (ImageBuffer source = new ImageBuffer(sourceImage, ImageLockMode.ReadOnly))
using (ImageBuffer target = new ImageBuffer(targetImage, ImageLockMode.ReadOnly))
{
// use other override to calculate error
source.Dither(target, ditherer, quantizer, colorCount, parallelTaskCount);
}
}
public static void ChangeFormat(Image sourceImage, PixelFormat targetFormat, IColorQuantizer quantizer, out Image targetImage, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(sourceImage, "sourceImage");
// wraps source image to a buffer
using (ImageBuffer source = new ImageBuffer(sourceImage, ImageLockMode.ReadOnly))
{
ChangeFormat(source, targetFormat, quantizer, out targetImage, parallelTaskCount);
}
}
public static void CorrectImageGamma(Image sourceImage, Single gamma, IColorQuantizer quantizer, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(sourceImage, "sourceImage");
// wraps source image to a buffer
using (ImageBuffer source = new ImageBuffer(sourceImage, ImageLockMode.ReadOnly))
{
source.CorrectGamma(gamma, quantizer, parallelTaskCount);
}
}
public static void ChangeFormat(ImageBuffer source, PixelFormat targetFormat, IColorQuantizer quantizer, out Image targetImage, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(source, "source");
// creates a target bitmap in an appropriate format
targetImage = new Bitmap(source.Width, source.Height, targetFormat);
// wraps target image to a buffer
using (ImageBuffer target = new ImageBuffer(targetImage, ImageLockMode.WriteOnly))
{
source.ChangeFormat(target, quantizer, parallelTaskCount);
}
}
public static Double CalculateImageNormalizedMeanError(Image sourceImage, Image targetImage, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(sourceImage, "sourceImage");
Guard.CheckNull(targetImage, "targetImage");
// wraps source image to a buffer
using (ImageBuffer source = new ImageBuffer(sourceImage, ImageLockMode.ReadOnly))
using (ImageBuffer target = new ImageBuffer(targetImage, ImageLockMode.ReadOnly))
{
// use other override to calculate error
return source.CalculateNormalizedMeanError(target, parallelTaskCount);
}
}
public static Double CalculateImageNormalizedMeanError(ImageBuffer source, ImageBuffer target, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(source, "source");
// use other override to calculate error
return source.CalculateNormalizedMeanError(target, parallelTaskCount);
}
public static void TransformImagePerPixelAdvanced(ImageBuffer source, ImageBuffer target, IList<Point> path = null, Int32 parallelTaskCount = 4, params TransformPixelAdvancedFunction[] passes)
{
source.TransformPerPixelAdvanced(target, path, parallelTaskCount, passes);
}
public static void ProcessPerPixel(ImageBuffer source, IList<Point> path = null, Int32 parallelTaskCount = 4, params ProcessPixelAdvancedFunction[] passes)
{
source.ProcessPerPixelBase(path, parallelTaskCount, passes);
}
public static void TransformImagePerPixelAdvanced(ImageBuffer source, PixelFormat targetFormat, List<Color> palette, out Image targetImage, IList<Point> path = null, Int32 parallelTaskCount = 4, params TransformPixelAdvancedFunction[] passes)
{
source.TransformPerPixelAdvanced(targetFormat, palette, out targetImage, path, parallelTaskCount, passes);
}
public static void ProcessPerPixel(Image sourceImage, IList<Point> path = null, Int32 parallelTaskCount = 4, params ProcessPixelAdvancedFunction[] passes)
{
// checks parameters
Guard.CheckNull(sourceImage, "sourceImage");
// wraps source image to a buffer
using (ImageBuffer source = new ImageBuffer(sourceImage, ImageLockMode.ReadOnly))
{
source.ProcessPerPixelBase(path, parallelTaskCount, passes);
}
}
public Double CalculateMeanError(ImageBuffer target, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(target, "target");
// initializes the error
Int64 totalError = 0;
// prepares the function
TransformPixelFunction calculateMeanError = (passIndex, sourcePixel, targetPixel) =>
{
Color sourceColor = sourcePixel.GetColor();
Color targetColor = targetPixel.GetColor();
totalError += ColorModelHelper.GetColorEuclideanDistance(ColorModel.RedGreenBlue, sourceColor, targetColor);
return false;
};
// performs the image scan, using a chosen method
IList<Point> standardPath = new StandardPathProvider().GetPointPath(Width, Height);
TransformPerPixelBase(target, standardPath, parallelTaskCount, calculateMeanError);
// returns the calculates RMSD
return Math.Sqrt(totalError/(3.0*Width*Height));
}
public static Image QuantizeImage(ImageBuffer source, IColorQuantizer quantizer, Int32 colorCount, Int32 parallelTaskCount = 4)
{
// performs the pure quantization wihout dithering
return QuantizeImage(source, quantizer, null, colorCount, parallelTaskCount);
}
public void ChangeFormat(ImageBuffer target, IColorQuantizer quantizer, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(target, "target");
Guard.CheckNull(quantizer, "quantizer");
// gathers some information about the target format
Boolean hasSourceAlpha = PixelFormat.HasAlpha();
Boolean hasTargetAlpha = target.PixelFormat.HasAlpha();
Boolean isTargetIndexed = target.PixelFormat.IsIndexed();
Boolean isSourceDeepColor = PixelFormat.IsDeepColor();
Boolean isTargetDeepColor = target.PixelFormat.IsDeepColor();
// prepares the palette if needed
if (isTargetIndexed)
{
// synthetises palette using provided quantizer
List<Color> targetPalette = SynthetizePalette(quantizer, target.PixelFormat.GetColorCount(), parallelTaskCount);
// updates the bitmap palette
target.bitmap.SetPalette(targetPalette);
target.UpdatePalette(true);
}
// prepares the quantization function
TransformPixelFunction changeFormat = (passIndex, sourcePixel, targetPixel) =>
{
// if both source and target formats are deep color formats, copies a value directly
if (isSourceDeepColor && isTargetDeepColor)
{
//UInt64 value = sourcePixel.Value;
//targetPixel.SetValue(value);
}
else
{
// retrieves a source image color
Color color = sourcePixel.GetColor();
// if alpha is not present in the source image, but is present in the target, make one up
if (!hasSourceAlpha && hasTargetAlpha)
{
Int32 argb = 255 << 24 | color.R << 16 | color.G << 8 | color.B;
color = Color.FromArgb(argb);
}
// sets the color to a target pixel
targetPixel.SetColor(color, quantizer);
}
// allows to write (obviously) the transformed pixel
return true;
};
// generates the target image
IList<Point> standardPath = new StandardPathProvider().GetPointPath(Width, Height);
TransformPerPixelBase(target, standardPath, parallelTaskCount, changeFormat);
}
public static Image QuantizeImage(ImageBuffer source, IColorQuantizer quantizer, IColorDitherer ditherer, Int32 colorCount, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(source, "source");
// creates a target bitmap in an appropriate format
PixelFormat targetPixelFormat = Extend.GetFormatByColorCount(colorCount);
Image result = new Bitmap(source.Width, source.Height, targetPixelFormat);
// lock mode
ImageLockMode lockMode = ditherer == null ? ImageLockMode.WriteOnly : ImageLockMode.ReadWrite;
// wraps target image to a buffer
using (ImageBuffer target = new ImageBuffer(result, lockMode))
{
source.Quantize(target, quantizer, ditherer, colorCount, parallelTaskCount);
return result;
}
}
public void Quantize(ImageBuffer target, IColorQuantizer quantizer, Int32 colorCount, Int32 parallelTaskCount = 4)
{
// performs the pure quantization wihout dithering
Quantize(target, quantizer, null, colorCount, parallelTaskCount);
}
public static Image QuantizeImage(Image sourceImage, IColorQuantizer quantizer, IColorDitherer ditherer, Int32 colorCount, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(sourceImage, "sourceImage");
// lock mode
ImageLockMode lockMode = ditherer == null ? ImageLockMode.ReadOnly : ImageLockMode.ReadWrite;
// wraps source image to a buffer
using (ImageBuffer source = new ImageBuffer(sourceImage, lockMode))
{
return QuantizeImage(source, quantizer, ditherer, colorCount, parallelTaskCount);
}
}
public void TransformPerPixelAdvanced(ImageBuffer target, IList<Point> path = null, Int32 parallelTaskCount = 4, params TransformPixelAdvancedFunction[] passes)
{
TransformPerPixelBase(target, path, parallelTaskCount, passes);
}
public static void ScanImageColors(Image sourceImage, IColorQuantizer quantizer, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(sourceImage, "sourceImage");
// wraps source image to a buffer
using (ImageBuffer source = new ImageBuffer(sourceImage, ImageLockMode.ReadOnly))
{
source.ScanColors(quantizer, parallelTaskCount);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="Pixel"/> struct.
/// </summary>
public Pixel(ImageBuffer parent)
{
Parent = parent;
Initialize();
}
public static List<Color> SynthetizeImagePalette(Image sourceImage, IColorQuantizer quantizer, Int32 colorCount, Int32 parallelTaskCount = 4)
{
// checks parameters
Guard.CheckNull(sourceImage, "sourceImage");
// wraps source image to a buffer
using (ImageBuffer source = new ImageBuffer(sourceImage, ImageLockMode.ReadOnly))
{
return source.SynthetizePalette(quantizer, colorCount, parallelTaskCount);
}
}
internal void DrawLine(Pen pen, Point pt1, Point pt2)
{
var linePixels = DrawLine(_bitmap.Width, _bitmap.Height, pt1.X, pt1.Y, pt2.X, pt2.Y);
var color = pen.Color;
if (_dummyImageBuffer == null)
_dummyImageBuffer = new ImageBuffer(new Bitmap(_bitmap.Width, _bitmap.Height, _bitmap.PixelFormat),
ImageLockMode.ReadOnly);
_dummyImageBuffer.TransformPerPixel(null, ref _bitmap,
linePixels.Select(idx => new Point(idx % _bitmap.Width, idx / _bitmap.Width)).ToList(), ParallelTaskCount,
(passIndex, sourcePixel, targetPixel) =>
{
targetPixel.SetColor(color, _quantizer);
return true;
});
}
public void TransformPerPixel(List<Color> palette, ref Image targetImage, IList<Point> path = null,
Int32 parallelTaskCount = 4, params TransformPixelFunction[] passes)
{
// checks parameters
Guard.CheckNull(targetImage, "targetImage");
// creates a target bitmap in an appropriate format
var targetFormat = targetImage.PixelFormat;
// sets image palette if needed
if (palette != null && targetFormat.IsIndexed()) targetImage.SetPalette(palette);
// wraps target image to a buffer
using (var target = new ImageBuffer(targetImage, ImageLockMode.WriteOnly))
{
TransformPerPixelBase(target, path, parallelTaskCount, passes);
}
}
