public static void BlurVertically()
{
if (width > 0 && height > 0)
{
if (tempData.Length < total)
{
tempData = new byte[total];
}
for (var y = 0; y < height; y++)
{
for (var x = 0; x < width; x++)
{
var a = GetDefault(x, y - 1);
var b = GetDefault(x, y);
var c = GetDefault(x, y + 1);
var t = (int)a + (int)b + (int)c;
tempData[x + y * width] = (byte)(t / 3);
}
}
D2D_Helper.Swap(ref data, ref tempData);
}
}
public static void Resize(int newWidth, int newHeight)
{
if (newWidth >= 0 && newHeight >= 0 && width > 0 && height > 0)
{
var newTotal = newWidth * newHeight;
if (tempData.Length < newTotal)
{
tempData = new byte[newTotal];
}
var w = (float)(newWidth - 1);
var h = (float)(newHeight - 1);
for (var y = 0; y < newHeight; y++)
{
for (var x = 0; x < newWidth; x++)
{
tempData[x + y * newWidth] = GetBilinear((float)x / w, (float)y / h);
}
}
width = newWidth;
height = newHeight;
total = newTotal;
D2D_Helper.Swap(ref data, ref tempData);
}
}
public static void Halve()
{
if (width > 0 && height > 0)
{
var newWidth = width / 2;
var newHeight = height / 2;
if (newWidth >= 0 && newHeight >= 0)
{
var newTotal = newWidth * newHeight;
if (tempData.Length < newTotal)
{
tempData = new byte[newTotal];
}
for (var y = 0; y < newHeight; y++)
{
var y0 = y * 2;
var y1 = y0 + 1;
for (var x = 0; x < newWidth; x++)
{
var x0 = x * 2;
var x1 = x0 + 1;
var a = GetClamp(x0, y0);
var b = GetClamp(x1, y0);
var c = GetClamp(x0, y1);
var d = GetClamp(x1, y1);
var t = (int)a + (int)b + (int)c + (int)d;
tempData[x + y * newWidth] = (byte)(t / 4);
}
}
width = newWidth;
height = newHeight;
total = newTotal;
D2D_Helper.Swap(ref data, ref tempData);
}
}
}
public void AddTriangle(D2D_Point a, D2D_Point b, D2D_Point c)
{
if (a.Y != b.Y || a.Y != c.Y)
{
// Make a highest, and c lowest
if (b.Y > a.Y)
{
D2D_Helper.Swap(ref a, ref b);
}
if (c.Y > a.Y)
{
D2D_Helper.Swap(ref c, ref a);
}
if (c.Y > b.Y)
{
D2D_Helper.Swap(ref b, ref c);
}
var fth = a.Y - c.Y; // Full triangle height
var tth = a.Y - b.Y; // Top triangle height
var bth = b.Y - c.Y; // Bottom triangle height
// Find a to c intercept along b plane
var inx = c.X + (a.X - c.X) * D2D_Helper.Divide(bth, fth);
var d = new D2D_Point((int)inx, b.Y);
// Top triangle
var abs = D2D_Helper.Divide(a.X - b.X, tth); // A/B slope
var ads = D2D_Helper.Divide(a.X - d.X, tth); // A/D slope
AddTriangle(b.X, d.X, abs, ads, b.Y, 1, tth);
// Bottom triangle
var cbs = D2D_Helper.Divide(c.X - b.X, bth); // C/B slope
var cds = D2D_Helper.Divide(c.X - d.X, bth); // C/D slope
AddTriangle(b.X, d.X, cbs, cds, b.Y, -1, bth);
}
}
public void AddTriangle(float l, float r, float ls, float rs, int y, int s, int c) // left x, right x, left slope, right slope, y, sign, count
{
if (l > r)
{
D2D_Helper.Swap(ref l, ref r);
D2D_Helper.Swap(ref ls, ref rs);
}
for (var i = 0; i < c; i++)
{
var il = Mathf.FloorToInt(l);
var ir = Mathf.CeilToInt(r);
for (var x = il; x < ir; x++)
{
AddPixel(x, y);
}
y += s;
l += ls;
r += rs;
}
}