public IEnumerable <int> Process(IEnumerable <Color> colors)
{
var colorList = colors.ToArray();
_quantizer.CreatePalette(colorList);
var processingAction = new Action <LineTask <Color[], int[]> >(taskModel =>
{
var matrixWidth = Matrix.GetLength(0);
var matrixHeight = Matrix.GetLength(1);
for (int i = taskModel.Start; i < taskModel.Start + taskModel.Length; i++)
{
int x = i % _width % matrixWidth;
int y = i / _width % matrixHeight;
int threshold = Convert.ToInt32(Matrix[x, y]);
var color = taskModel.Input[i];
int red = GetClampedValue(color.R + threshold, 0, 255);
int green = GetClampedValue(color.G + threshold, 0, 255);
int blue = GetClampedValue(color.B + threshold, 0, 255);
taskModel.Output[i] = _quantizer.GetPaletteIndex(Color.FromArgb(color.A, red, green, blue));
}
});
var indices = new int[colorList.Length];
ParallelProcessing.ProcessList(colorList, indices, processingAction, _quantizer.TaskCount);
return(indices);
}
public Bitmap GenerateNewBitmap(Bitmap bitmap, IColorQuantizer quantizer, int colorCount)
{
var colors = GetPalette(bitmap, quantizer, colorCount).ToArray();
Func <Color, Color> func = c => colors[quantizer.GetPaletteIndex(c)];
return(_imageBuilder.BuildBitmap(bitmap, func));
}
private void ProcessingAction(DelayedLineTask <ErrorDiffusionElement <Color, ColorComponentError>, int[]> delayedLineTask, int index)
{
// Get reference elements to work with
var inputElement = delayedLineTask.Input[index];
var sourceColor = inputElement.Input;
var error = inputElement.Error;
// Add error component values to source color
var errorDiffusedColor = Color.FromArgb(
sourceColor.A,
GetClampedValue(sourceColor.R + error.RedError, 0, 255),
GetClampedValue(sourceColor.G + error.GreenError, 0, 255),
GetClampedValue(sourceColor.B + error.BlueError, 0, 255));
// Quantize error diffused source color
delayedLineTask.Output[index] = _quantizer.GetPaletteIndex(errorDiffusedColor);
// Retrieve new quantized color for this point
var targetColor = _quantizer.GetPalette()[delayedLineTask.Output[index]];
// Calculate errors to distribute for this point
int redError = errorDiffusedColor.R - targetColor.R;
int greenError = errorDiffusedColor.G - targetColor.G;
int blueError = errorDiffusedColor.B - targetColor.B;
// Retrieve point position
var pixelX = index % _width;
var pixelY = index / _width;
// Process the matrix
for (int shiftY = -MatrixSideHeight; shiftY <= MatrixSideHeight; shiftY++)
{
for (int shiftX = -MatrixSideWidth; shiftX <= MatrixSideWidth; shiftX++)
{
int targetX = pixelX + shiftX;
int targetY = pixelY + shiftY;
var coefficient = Matrix[shiftY + MatrixSideHeight, shiftX + MatrixSideWidth];
var errorFactor = ErrorFactorMatrix[shiftY + MatrixSideHeight, shiftX + MatrixSideWidth];
// If substantial error factor and target point in image bounds
if (coefficient != 0 &&
targetX >= 0 && targetX < _width &&
targetY >= 0 && targetY < _height)
{
// Add error to target point for later processing
var newTarget = delayedLineTask.Input[targetX + targetY * _width];
newTarget.Error.RedError += Convert.ToInt32(errorFactor * redError);
newTarget.Error.GreenError += Convert.ToInt32(errorFactor * greenError);
newTarget.Error.BlueError += Convert.ToInt32(errorFactor * blueError);
}
}
}
}
public void SetColor(Color color, IColorQuantizer quantizer)
{
// determines whether the format is indexed
if (IsIndexed)
{
// last chance if quantizer is provided, use it
if (quantizer != null)
{
Byte index = (Byte)quantizer.GetPaletteIndex(color, X, Y);
((IIndexedPixel)pixelData).SetIndex(bitOffset, index);
}
else // cannot write color to an index format
{
String message = string.Format("Cannot retrieve color for an indexed format. Use GetPixelIndex() instead.");
throw new NotSupportedException(message);
}
}
else // sets color to a non-indexed format
{
((INonIndexedPixel)pixelData).SetColor(color);
}
}
public void SetColorToPixel(Pixel pixel, Color color, IColorQuantizer quantizer)
{
// determines whether the format is indexed
if (pixel.IsIndexed)
{
// last chance if quantizer is provided, use it
if (quantizer != null)
{
Byte index = (Byte)quantizer.GetPaletteIndex(color, pixel.X, pixel.Y);
pixel.Index = index;
}
else // cannot write color to an index format
{
String message = string.Format("Cannot retrieve color for an indexed format. Use GetPixelIndex() instead.");
throw new NotSupportedException(message);
}
}
else // sets color to a non-indexed format
{
pixel.Color = color;
}
}
private Image GetQuantizedImage(Image image)
{
// checks whether a source image is valid
if (image == null)
{
const String message = "Cannot quantize a null image.";
throw new ArgumentNullException(message);
}
// locks the source image data
Bitmap bitmap = (Bitmap)image;
Rectangle bounds = Rectangle.FromLTRB(0, 0, bitmap.Width, bitmap.Height);
BitmapData sourceData = bitmap.LockBits(bounds, ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
// prepares time statistics variables
TimeSpan duration = new TimeSpan(0);
DateTime before;
try
{
// initalizes the pixel read buffer
Int32[] sourceBuffer = new Int32[image.Width];
// sets the offset to the first pixel in the image
Int64 sourceOffset = sourceData.Scan0.ToInt64();
for (Int32 row = 0; row < image.Height; row++)
{
// copies the whole row of pixels to the buffer
Marshal.Copy(new IntPtr(sourceOffset), sourceBuffer, 0, image.Width);
// scans all the colors in the buffer
foreach (Color color in sourceBuffer.Select(argb => Color.FromArgb(argb)))
{
before = DateTime.Now;
activeQuantizer.AddColor(color);
duration += DateTime.Now - before;
}
// increases a source offset by a row
sourceOffset += sourceData.Stride;
}
editTargetInfo.Text = string.Format("Quantized: {0} colors (duration {1})", 256, duration); // TODO
}
catch
{
bitmap.UnlockBits(sourceData);
throw;
}
Bitmap result = new Bitmap(image.Width, image.Height, PixelFormat.Format8bppIndexed);
// calculates the palette
try
{
before = DateTime.Now;
Int32 colorCount = GetColorCount();
List <Color> palette = activeQuantizer.GetPalette(colorCount);
// sets our newly calculated palette to the target image
ColorPalette imagePalette = result.Palette;
duration += DateTime.Now - before;
for (Int32 index = 0; index < palette.Count; index++)
{
imagePalette.Entries[index] = palette[index];
}
result.Palette = imagePalette;
}
catch (Exception)
{
bitmap.UnlockBits(sourceData);
throw;
}
// locks the target image data
BitmapData targetData = result.LockBits(bounds, ImageLockMode.WriteOnly, PixelFormat.Format8bppIndexed);
try
{
// initializes read/write buffers
Byte[] targetBuffer = new Byte[result.Width];
Int32[] sourceBuffer = new Int32[image.Width];
// sets the offsets on the beginning of both source and target image
Int64 sourceOffset = sourceData.Scan0.ToInt64();
Int64 targetOffset = targetData.Scan0.ToInt64();
for (Int32 row = 0; row < image.Height; row++)
{
// reads the pixel row from the source image
Marshal.Copy(new IntPtr(sourceOffset), sourceBuffer, 0, image.Width);
// goes thru all the pixels, reads the color on the source image, and writes calculated palette index on the target
for (Int32 index = 0; index < image.Width; index++)
{
Color color = Color.FromArgb(sourceBuffer[index]);
before = DateTime.Now;
targetBuffer[index] = (Byte)activeQuantizer.GetPaletteIndex(color);
duration += DateTime.Now - before;
}
// writes the pixel row to the target image
Marshal.Copy(targetBuffer, 0, new IntPtr(targetOffset), result.Width);
// increases the offsets (on both images) by a row
sourceOffset += sourceData.Stride;
targetOffset += targetData.Stride;
}
}
finally
{
// releases the locks on both images
bitmap.UnlockBits(sourceData);
result.UnlockBits(targetData);
}
// spits some duration statistics (those actually slow the processing quite a bit, turn them off to make it quicker)
editSourceInfo.Text = string.Format("Original: {0} colors ({1} x {2})", activeQuantizer.GetColorCount(), image.Width, image.Height);
// returns the quantized image
return(result);
}
public void SetColor(Color color, IColorQuantizer quantizer)
{
// determines whether the format is indexed
if (IsIndexed)
{
// last chance if quantizer is provided, use it
if (quantizer != null)
{
Byte index = (Byte) quantizer.GetPaletteIndex(color, X, Y);
((IIndexedPixel) pixelData).SetIndex(bitOffset, index);
}
else // cannot write color to an index format
{
String message = string.Format("Cannot retrieve color for an indexed format. Use GetPixelIndex() instead.");
throw new NotSupportedException(message);
}
}
else // sets color to a non-indexed format
{
((INonIndexedPixel) pixelData).SetColor(color);
}
}
private Image GetQuantizedImage(Image image)
{
if (image == null)
{
const String message = "Cannot quantize your file. Please choose a new file.";
throw new ArgumentNullException(message);
}
Bitmap bitmap = (Bitmap)image;
Rectangle bounds = Rectangle.FromLTRB(0, 0, bitmap.Width, bitmap.Height);
BitmapData sourceData = bitmap.LockBits(bounds, ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
try
{
int[] sourceBuffer = new int[image.Width];
Int64 sourceOffset = sourceData.Scan0.ToInt64();
for (int i = 0; i < image.Height; i++)
{
Marshal.Copy(new IntPtr(sourceOffset), sourceBuffer, 0, image.Width);
foreach (Color color in sourceBuffer.Select(argb => Color.FromArgb(argb)))
{
activeQuantizer.AddColor(color);
}
sourceOffset += sourceData.Stride;
}
}
catch
{
bitmap.UnlockBits(sourceData);
throw;
}
Bitmap result = new Bitmap(image.Width, image.Height, PixelFormat.Format8bppIndexed);
try
{
List <Color> palette = activeQuantizer.GetPalette(256);
ColorPalette imagePalette = result.Palette;
for (Int32 index = 0; index < palette.Count; index++)
{
imagePalette.Entries[index] = palette[index];
}
PaletteBox.Image = GetPalette.GetPaletteBitmap(palette);
result.Palette = imagePalette;
}
catch (Exception)
{
bitmap.UnlockBits(sourceData);
throw;
}
BitmapData targetData = result.LockBits(bounds, ImageLockMode.WriteOnly, PixelFormat.Format8bppIndexed);
try
{
Byte[] targetBuffer = new Byte[result.Width];
int[] sourceBuffer = new int[image.Width];
Int64 sourceOffset = sourceData.Scan0.ToInt64();
Int64 targetOffset = targetData.Scan0.ToInt64();
for (int i = 0; i < image.Height; i++)
{
Marshal.Copy(new IntPtr(sourceOffset), sourceBuffer, 0, image.Width);
for (int j = 0; j < image.Width; j++)
{
Color color = Color.FromArgb(sourceBuffer[j]);
targetBuffer[j] = (Byte)activeQuantizer.GetPaletteIndex(color);
}
Marshal.Copy(targetBuffer, 0, new IntPtr(targetOffset), result.Width);
sourceOffset += sourceData.Stride;
targetOffset += targetData.Stride;
}
}
finally
{
bitmap.UnlockBits(sourceData);
result.UnlockBits(targetData);
}
this.Result = result;
ColorDistanceBox.Text = ColorDistance.GetColorDistance(this.SourceImage, result).ToString();
return(result);
}
public void SetColorToPixel(Pixel pixel, Color color, IColorQuantizer quantizer)
{
// determines whether the format is indexed
if (pixel.IsIndexed)
{
// last chance if quantizer is provided, use it
if (quantizer != null)
{
Byte index = (Byte)quantizer.GetPaletteIndex(color, pixel.X, pixel.Y);
pixel.Index = index;
}
else // cannot write color to an index format
{
String message = string.Format("Cannot retrieve color for an indexed format. Use GetPixelIndex() instead.");
throw new NotSupportedException(message);
}
}
else // sets color to a non-indexed format
{
pixel.Color = color;
}
}
public Image GetQuantizedImage(Image image)
{
// checks whether a source image is valid
if (image == null)
{
const String message = "Cannot quantize a null image.";
throw new ArgumentNullException(message);
}
// locks the source image data
Bitmap bitmap = (Bitmap)image;
Rectangle bounds = Rectangle.FromLTRB(0, 0, bitmap.Width, bitmap.Height);
BitmapData sourceData = bitmap.LockBits(bounds, ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
try
{
Int32[] sourceBuffer = new Int32[image.Width];
Int64 sourceOffset = sourceData.Scan0.ToInt64();
for (Int32 row = 0; row < image.Height; row++)
{
Marshal.Copy(new IntPtr(sourceOffset), sourceBuffer, 0, image.Width);
foreach (Color color in sourceBuffer.Select(argb => Color.FromArgb(argb)))
{
quantizer.AddColor(color);
}
// increases a source offset by a row
sourceOffset += sourceData.Stride;
}
}
catch
{
bitmap.UnlockBits(sourceData);
throw;
}
// calculates the palette
Bitmap result = new Bitmap(image.Width, image.Height, PixelFormat.Format8bppIndexed);
List <Color> palette = quantizer.GetPalette(256);
ColorPalette imagePalette = result.Palette;
for (Int32 index = 0; index < palette.Count; index++)
{
try
{
imagePalette.Entries[index] = palette[index];
} catch
{
}
}
result.Palette = imagePalette;
// locks the target image data
BitmapData targetData = result.LockBits(bounds, ImageLockMode.WriteOnly, PixelFormat.Format8bppIndexed);
try
{
Byte[] targetBuffer = new Byte[result.Width];
Int32[] sourceBuffer = new Int32[image.Width];
Int64 sourceOffset = sourceData.Scan0.ToInt64();
Int64 targetOffset = targetData.Scan0.ToInt64();
for (Int32 row = 0; row < image.Height; row++)
{
Marshal.Copy(new IntPtr(sourceOffset), sourceBuffer, 0, image.Width);
for (Int32 index = 0; index < image.Width; index++)
{
Color color = Color.FromArgb(sourceBuffer[index]);
targetBuffer[index] = quantizer.GetPaletteIndex(color);
}
Marshal.Copy(targetBuffer, 0, new IntPtr(targetOffset), result.Width);
// increases the offsets by a row
sourceOffset += sourceData.Stride;
targetOffset += targetData.Stride;
}
}
finally
{
// releases the locks on both images
bitmap.UnlockBits(sourceData);
result.UnlockBits(targetData);
}
return(result);
}
public void Quantize(IColorQuantizer quantizer, int colorCount)
{
if (Disposed)
{
return;
}
int myWidth = Width;
int myHeight = Height;
Color *colors = GetColors();
quantizer.Prepare(this);
bool usesAlpha = false;
// weird stuff to make the quantizer work with alpha
Color lastColor = new Color(255, 255, 255, 0);
bool firstColorFound = false;
for (int y = 0; y < myHeight; y++)
{
for (int x = 0; x < myWidth; x++)
{
int idx = x + y * myWidth;
var col = *(colors + idx);
if (col.A > 128)
{
col.A = 255;
(*(colors + x + y * myWidth)) = col;
if (!firstColorFound && usesAlpha)
{
for (int i = 0; i < idx; i++)
{
quantizer.AddColor(col, i % myWidth, Mathf.FloorToInt(i / myWidth));
}
}
firstColorFound = true;
lastColor = col;
quantizer.AddColor(col, x, y);
}
else
{
col = new Color(255, 255, 255, 0);
(*(colors + x + y * myWidth)) = col;
usesAlpha = true;
if (firstColorFound)
{
quantizer.AddColor(lastColor, x, y);
}
}
}
}
var palette = quantizer.GetPalette(colorCount);
for (int y = 0; y < myHeight; y++)
{
for (int x = 0; x < myWidth; x++)
{
if ((*(colors + x + y * myWidth)).A == 255)
{
int index = quantizer.GetPaletteIndex(*(colors + x + y * myWidth), x, y);
//Debug.Log(index);
*(colors + x + y * myWidth) = palette[index];
}
}
}
quantizer.Finish();
}
public static byte GetPaletteIndex(IColorQuantizer q, int x, int y, int r, int g, int b)
{
return((byte)q.GetPaletteIndex(Color.FromArgb(r, g, b), x, y));
}
/// <summary>
/// Changes the pixel format.
/// </summary>
/// <param name="image">The image.</param>
/// <param name="targetFormat">The target format.</param>
/// <param name="quantizer">The color quantizer.</param>
/// <returns>The converted image in a target format.</returns>
public static Image ChangePixelFormat(this Image image, PixelFormat targetFormat, IColorQuantizer quantizer)
{
// checks for image validity
if (image == null)
{
const String message = "Cannot change a pixel format for a null image.";
throw new ArgumentNullException(message);
}
// checks whether a target format is supported
if (!targetFormat.IsSupported())
{
String message = string.Format("A pixel format '{0}' is not supported.", targetFormat);
throw new NotSupportedException(message);
}
// checks whether there is a quantizer for a indexed format
if (targetFormat.IsIndexed() && quantizer == null)
{
String message = string.Format("A quantizer is cannot be null for indexed pixel format '{0}'.", targetFormat);
throw new NotSupportedException(message);
}
// creates an image with the target format
Bitmap result = new Bitmap(image.Width, image.Height, targetFormat);
ColorPalette imagePalette = image.Palette;
// gathers some information about the target format
Boolean hasSourceAlpha = image.PixelFormat.HasAlpha();
Boolean hasTargetAlpha = targetFormat.HasAlpha();
Boolean isSourceIndexed = image.PixelFormat.IsIndexed();
Boolean isTargetIndexed = targetFormat.IsIndexed();
Boolean isSourceDeepColor = image.PixelFormat.IsDeepColor();
Boolean isTargetDeepColor = targetFormat.IsDeepColor();
// if palette is needed create one first
if (isTargetIndexed)
{
quantizer.Prepare(image);
image.AddColorsToQuantizer(quantizer);
Int32 targetColorCount = result.GetPaletteColorCount();
List<Color> palette = quantizer.GetPalette(targetColorCount);
result.SetPalette(palette);
}
Action<Pixel, Pixel> changeFormat = (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 = isSourceIndexed ? imagePalette.Entries[sourcePixel.Index] : sourcePixel.Color;
// 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
if (isTargetIndexed)
{
// for the indexed images, determines a color from the octree
Byte paletteIndex = (Byte) quantizer.GetPaletteIndex(color);
targetPixel.SetIndex(paletteIndex);
}
else
{
// for the non-indexed images, sets the color directly
targetPixel.SetColor(color);
}
}
};
// process image -> changes format
image.ProcessImagePixels(result, changeFormat);
// returns the image in the target format
return result;
}
