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);
}
}
private void ProcessPerPixelBase(IList <Point> path = null, Int32 parallelTaskCount = 4, params Delegate[] passes)
{
// checks parameters
Guard.CheckNull(passes, "passes");
// determines mode
Boolean isAdvanced = passes.Length > 0 && passes[0] is ProcessPixelAdvancedFunction;
// creates default path, if none is available
if (path == null)
{
path = StandardPathProvider.CreatePath(Width, Height);
}
// prepares the per pixel task
Action <LineTask> processPerPixel = lineTask =>
{
// initializes variables per task
Pixel pixel = CreatePixel();
Delegate pass = passes[lineTask.PassIndex];
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
pixel.Update(point.X, point.Y);
// when read is allowed, retrieves current value (in bytes)
if (CanRead)
{
ReadPixel(pixel);
}
// process the pixel by custom user operation
if (isAdvanced)
{
ProcessPixelAdvancedFunction processAdvancedFunction = (ProcessPixelAdvancedFunction)pass;
allowWrite = processAdvancedFunction(lineTask.PassIndex, pixel, this);
}
else // use simplified version with pixel parameter only
{
ProcessPixelFunction processFunction = (ProcessPixelFunction)pass;
allowWrite = processFunction(lineTask.PassIndex, pixel);
}
// when write is allowed, copies the value back to the row buffer
if (CanWrite && allowWrite)
{
WritePixel(pixel);
}
}
};
// processes image per pixel
for (Int32 passIndex = 0; passIndex < passes.Length; passIndex++)
{
ProcessInParallel(passIndex, processPerPixel, path, parallelTaskCount);
}
}
