protected void ApplyFiltersTo(ref Bitmap b, ImageState s)
{
var imageRectF = s.layout.GetRingAsRectF("image");
var areaOfEffect = imageRectF == null ? new Rectangle(0, 0, b.Width, b.Height) : PolygonMath.ToRectangleShrinkRound(imageRectF.Value);
//TODO: if the image is unrotated, use a rectangle to limit the effect to the desired area
string str = null;
int i = 0;
//If radiusunits is specified, use that code path.
double units = s.settings.Get <double>("a.radiusunits", 1000);
//TODO: move blur/sharpen aliases to a compatibility shim, deprecate them
i = GetRadius(s, "blur", "a.blur", units);
if (i > 0)
{
new GaussianBlur(1.4, i).ApplyInPlace(b, areaOfEffect);
}
i = GetRadius(s, "sharpen", "a.sharpen", units);
if (i > 0)
{
new GaussianSharpen(1.4, Math.Min(11, i)).ApplyInPlace(b, areaOfEffect);
}
i = GetRadius(s, "a.oilpainting", null, units);
if (i > 0)
{
new OilPainting(i).ApplyInPlace(b, areaOfEffect);
}
if ("true".Equals(s.settings["a.removenoise"], StringComparison.OrdinalIgnoreCase))
{
new ConservativeSmoothing(3).ApplyInPlace(b, areaOfEffect);
}
else
{
i = GetRadius(s, "a.removenoise", null, units);
if (i > 0)
{
new ConservativeSmoothing(i).ApplyInPlace(b, areaOfEffect);
}
}
//Sobel only supports 8bpp grayscale images.
//true/false
if ("true".Equals(s.settings["a.sobel"], StringComparison.OrdinalIgnoreCase))
{
Bitmap old = b;
try{
b = Grayscale.CommonAlgorithms.Y.Apply(b);
}finally{
if (old != s.sourceBitmap)
{
old.Dispose();
}
}
new SobelEdgeDetector().ApplyInPlace(b, areaOfEffect);
str = s.settings["a.threshold"]; //radius
if (!string.IsNullOrEmpty(str) && int.TryParse(str, NumberStyles.Integer, NumberFormatInfo.InvariantInfo, out i) && i > 0)
{
new Threshold(i).ApplyInPlace(b, areaOfEffect);
}
}
//Canny Edge Detector only supports 8bpp grayscale images.
//true/false
if ("true".Equals(s.settings["a.canny"], StringComparison.OrdinalIgnoreCase))
{
Bitmap old = b;
try {
b = Grayscale.CommonAlgorithms.Y.Apply(b);
} finally {
if (old != s.sourceBitmap)
{
old.Dispose();
}
}
new CannyEdgeDetector().ApplyInPlace(b, areaOfEffect);
}
//true/false - duplicate with SimpleFilters?
if ("true".Equals(s.settings["a.sepia"], StringComparison.OrdinalIgnoreCase))
{
new Sepia().ApplyInPlace(b, areaOfEffect);
}
//true/false
if ("true".Equals(s.settings["a.equalize"], StringComparison.OrdinalIgnoreCase))
{
new HistogramEqualization().ApplyInPlace(b, areaOfEffect);
}
//White balance adjustment
var whiteAlg = s.settings.Get <HistogramThresholdAlgorithm>("a.balancewhite");
var whiteVal = s.settings.Get <double>("a.balancethreshold");
if (whiteAlg != null || whiteVal != null)
{
var bal = new AutoWhiteBalance(whiteAlg ?? HistogramThresholdAlgorithm.Area);
if (whiteVal != null)
{
bal.LowThreshold = bal.HighThreshold = whiteVal.Value / 100;
}
bal.ApplyInPlace(b, areaOfEffect);
}
str = s.settings["a.posterize"]; //number of colors to merge
if (!string.IsNullOrEmpty(str) && int.TryParse(str, NumberStyles.Integer, NumberFormatInfo.InvariantInfo, out i) && i > 0)
{
SimplePosterization sp = new SimplePosterization();
if (i < 1)
{
i = 1;
}
if (i > 255)
{
i = 255;
}
sp.PosterizationInterval = (byte)i;
sp.ApplyInPlace(b, areaOfEffect);
}
//Pixelate doesn't support 32-bit images, only 24-bit
//str = s.settings["a.pixelate"]; //number of colors to merge
//if (!string.IsNullOrEmpty(str) && int.TryParse(str, out i)){
// if (i < 2) i = 2;
// if (i > 32) i = 32;
// new Pixelate(i).ApplyInPlace(s.destBitmap);
//}
float contrast = s.settings.Get <float>("a.contrast", 0);
float brightness = s.settings.Get <float>("a.brightness", 0);
float saturation = s.settings.Get <float>("a.saturation", 0);
if (contrast != 0 || brightness != 0 || saturation != 0)
{
HSLLinear adjust = new HSLLinear();
AdjustContrastBrightnessSaturation(adjust, contrast, brightness, saturation, "true".Equals(s.settings["a.truncate"]));
adjust.ApplyInPlace(b, areaOfEffect);
}
//TODO - add grayscale?
//For adding fax-like thresholding, use BradleyLocalThresholding
//For trimming solid-color whitespace, use Shrink
}