protected override ColorBgra Render(int x, int y, ColorBgra initial, Surface source)
{
var targetA = source[Offset(Bounds.Left, x, Bounds.Right), y];
initial = initial.Blend(targetA, GetBorderBlendValue(Bounds.Left, x, Bounds.Right));
var targetC = source[Offset(Bounds.Left, x, Bounds.Right), Offset(Bounds.Top, y, Bounds.Bottom)];
var targetB = source[x, Offset(Bounds.Top, y, Bounds.Bottom)];
targetB = targetB.Blend(targetC, GetBorderBlendValue(Bounds.Left, x, Bounds.Right));
initial = initial.Blend(targetB, GetBorderBlendValue(Bounds.Top, y, Bounds.Bottom));
return initial;
}
public virtual void BeforeRender()
{
if (!this.lerpCacheIsValid)
{
byte startAlpha;
byte endAlpha;
if (this.alphaOnly)
{
ComputeAlphaOnlyValuesFromColors(this.startColor, this.endColor, out startAlpha, out endAlpha);
}
else
{
startAlpha = this.startColor.A;
endAlpha = this.endColor.A;
}
this.lerpAlphas = new byte[256];
this.lerpColors = new ColorBgra[256];
for (int i = 0; i < 256; ++i)
{
byte a = (byte)i;
this.lerpColors[a] = ColorBgra.Blend(this.startColor, this.endColor, a);
this.lerpAlphas[a] = (byte)(startAlpha + ((endAlpha - startAlpha) * a) / 255);
}
this.lerpCacheIsValid = true;
}
}
private void RenderChannel(Graphics g, ColorBgra color, int channel, long max, float mean)
{
Rectangle innerRect = ClientRectangle;
int l = innerRect.Left;
int t = innerRect.Top;
int b = innerRect.Bottom;
int r = innerRect.Right;
int channels = histogram.Channels;
int entries = histogram.Entries;
long[] hist = Histogram.HistogramValues[channel];
++max;
if (FlipHorizontal)
{
Utility.Swap(ref l, ref r);
}
if (!FlipVertical)
{
Utility.Swap(ref t, ref b);
}
PointF[] points = new PointF[entries + 2];
points[entries] = new PointF(Utility.Lerp(l, r, -1), Utility.Lerp(t, b, 20));
points[entries + 1] = new PointF(Utility.Lerp(l, r, -1), Utility.Lerp(b, t, 20));
for (int i = 0; i < entries; i += entries - 1)
{
points[i] = new PointF(
Utility.Lerp(l, r, (float)hist[i] / (float)max),
Utility.Lerp(t, b, (float)i / (float)entries));
}
long sum3 = hist[0] + hist[1];
for (int i = 1; i < entries - 1; ++i)
{
sum3 += hist[i + 1];
points[i] = new PointF(
Utility.Lerp(l, r, (float)(sum3) / (float)(max * 3.1f)),
Utility.Lerp(t, b, (float)i / (float)entries));
sum3 -= hist[i - 1];
}
byte intensity = selected[channel] ? (byte)96 : (byte)32;
ColorBgra colorPen = ColorBgra.Blend(ColorBgra.Black, color, intensity);
ColorBgra colorBrush = color;
colorBrush.A = intensity;
Pen pen = new Pen(colorPen.ToColor(), 1.3f);
SolidBrush brush = new SolidBrush(colorBrush.ToColor());
g.FillPolygon(brush, points, FillMode.Alternate);
g.DrawPolygon(pen, points);
}
private void DrawToGraphics(Graphics g)
{
ColorBgra colorSolid = ColorBgra.FromColor(this.ForeColor);
ColorBgra colorGuide = ColorBgra.FromColor(this.ForeColor);
ColorBgra colorGrid = ColorBgra.FromColor(this.ForeColor);
colorGrid.A = 128;
colorGuide.A = 96;
Pen penSolid = new Pen(colorSolid.ToColor(), 1);
Pen penGrid = new Pen(colorGrid.ToColor(), 1);
Pen penGuide = new Pen(colorGuide.ToColor(), 1);
penGrid.DashStyle = DashStyle.Dash;
g.Clear(this.BackColor);
g.SmoothingMode = SmoothingMode.AntiAlias;
Rectangle ourRect = ClientRectangle;
ourRect.Inflate(-1, -1);
if (lastMouseXY.Y >= 0)
{
g.DrawLine(penGuide, 0, lastMouseXY.Y, Width, lastMouseXY.Y);
}
if (lastMouseXY.X >= 0)
{
g.DrawLine(penGuide, lastMouseXY.X, 0, lastMouseXY.X, Height);
}
for (float f = 0.25f; f <= 0.75f; f += 0.25f)
{
float x = Utility.Lerp(ourRect.Left, ourRect.Right, f);
float y = Utility.Lerp(ourRect.Top, ourRect.Bottom, f);
g.DrawLine(penGrid,
Point.Round(new PointF(x, ourRect.Top)),
Point.Round(new PointF(x, ourRect.Bottom)));
g.DrawLine(penGrid,
Point.Round(new PointF(ourRect.Left, y)),
Point.Round(new PointF(ourRect.Right, y)));
}
g.DrawLine(penGrid, ourRect.Left, ourRect.Bottom, ourRect.Right, ourRect.Top);
float width = this.ClientRectangle.Width;
float height = this.ClientRectangle.Height;
for (int c = 0; c < channels; ++c)
{
SortedList <int, int> channelControlPoints = controlPoints[c];
int points = channelControlPoints.Count;
ColorBgra color = GetVisualColor(c);
ColorBgra colorSelected = ColorBgra.Blend(color, ColorBgra.White, 128);
const float penWidthNonSelected = 1;
const float penWidthSelected = 2;
float penWidth = mask[c] ? penWidthSelected : penWidthNonSelected;
Pen penSelected = new Pen(color.ToColor(), penWidth);
color.A = 128;
Pen pen = new Pen(color.ToColor(), penWidth);
Brush brush = new SolidBrush(color.ToColor());
SolidBrush brushSelected = new SolidBrush(Color.White);
SplineInterpolator interpolator = new SplineInterpolator();
IList <int> xa = channelControlPoints.Keys;
IList <int> ya = channelControlPoints.Values;
PointF[] line = new PointF[Entries];
for (int i = 0; i < points; ++i)
{
interpolator.Add(xa[i], ya[i]);
}
for (int i = 0; i < line.Length; ++i)
{
line[i].X = (float)i * (width - 1) / (entries - 1);
line[i].Y = (float)(Utility.Clamp(entries - 1 - interpolator.Interpolate(i), 0, entries - 1)) *
(height - 1) / (entries - 1);
}
pen.LineJoin = LineJoin.Round;
g.DrawLines(pen, line);
for (int i = 0; i < points; ++i)
{
int k = channelControlPoints.Keys[i];
float x = k * (width - 1) / (entries - 1);
float y = (entries - 1 - channelControlPoints.Values[i]) * (height - 1) / (entries - 1);
const float radiusSelected = 4;
const float radiusNotSelected = 3;
const float radiusUnMasked = 2;
bool selected = (mask[c] && pointsNearMousePerChannel[c] == i);
float size = selected ? radiusSelected : (mask[c] ? radiusNotSelected : radiusUnMasked);
RectangleF rect = Utility.RectangleFromCenter(new PointF(x, y), size);
g.FillEllipse(selected ? brushSelected : brush, rect.X, rect.Y, rect.Width, rect.Height);
g.DrawEllipse(selected ? penSelected : pen, rect.X, rect.Y, rect.Width, rect.Height);
}
pen.Dispose();
}
penSolid.Dispose();
penGrid.Dispose();
penGuide.Dispose();
}