public static void Noise(FastBitmap bmp, Rectangle rect,
FastColour col, int variation)
{
int x, y, width, height;
if (!Drawer2DExt.ClampCoords(bmp, rect, out x, out y,
out width, out height))
{
return;
}
const int alpha = 255 << 24;
for (int yy = 0; yy < height; yy++)
{
int *row = bmp.GetRowPtr(y + yy);
for (int xx = 0; xx < width; xx++)
{
int n = (x + xx) + (y + yy) * 57;
n = (n << 13) ^ n;
float noise = 1f - ((n * (n * n * 15731 + 789221) + 1376312589) & 0x7fffffff) / 1073741824f;
int r = col.R + (int)(noise * variation);
r = r < 0 ? 0 : (r > 255 ? 255 : r);
int g = col.G + (int)(noise * variation);
g = g < 0 ? 0 : (g > 255 ? 255 : g);
int b = col.B + (int)(noise * variation);
b = b < 0 ? 0 : (b > 255 ? 255 : b);
row[x + xx] = alpha | (r << 16) | (g << 8) | b;
}
}
}
public static void Vertical(FastBitmap bmp, Rectangle rect,
FastColour a, FastColour b)
{
int x, y, width, height;
if (!Drawer2DExt.ClampCoords(bmp, rect, out x, out y,
out width, out height))
{
return;
}
FastColour c = a;
for (int yy = 0; yy < height; yy++)
{
int * row = bmp.GetRowPtr(y + yy);
float t = (float)yy / (height - 1); // so last row has b as its colour
c.R = (byte)Utils.Lerp(a.R, b.R, t);
c.G = (byte)Utils.Lerp(a.G, b.G, t);
c.B = (byte)Utils.Lerp(a.B, b.B, t);
int pixel = c.ToArgb();
for (int xx = 0; xx < width; xx++)
{
row[x + xx] = pixel;
}
}
}
public static void Blend(FastBitmap bmp, Rectangle rect,
FastColour col, int blend)
{
int x, y, width, height;
if (!Drawer2DExt.ClampCoords(bmp, rect, out x, out y,
out width, out height))
{
return;
}
// Pre compute the alpha blended source colour
col.R = (byte)(col.R * blend / 255);
col.G = (byte)(col.G * blend / 255);
col.B = (byte)(col.B * blend / 255);
blend = 255 - blend; // inverse for existing pixels
int t = 0;
for (int yy = 0; yy < height; yy++)
{
int *row = bmp.GetRowPtr(y + yy);
for (int xx = 0; xx < width; xx++)
{
int cur = row[x + xx], pixel = 0;
// Blend B
t = col.B + ((cur & 0xFF) * blend) / 255;
t = t < 0 ? 0 : t; t = t > 255 ? 255 : t;
pixel |= t;
// Blend G
t = col.G + (((cur >> 8) & 0xFF) * blend) / 255;
t = t < 0 ? 0 : t; t = t > 255 ? 255 : t;
pixel |= (t << 8);
// Blend R
t = col.R + (((cur >> 16) & 0xFF) * blend) / 255;
t = t < 0 ? 0 : t; t = t > 255 ? 255 : t;
pixel |= (t << 16);
// Output pixel
const int alphaMask = 255 << 24;
pixel |= alphaMask;
row[x + xx] = pixel;
}
}
}
public static void Draw(FastBitmap src, FastBitmap dst, Rectangle dstRect)
{
int x, y, width, height;
if (!Drawer2DExt.ClampCoords(dst, dstRect, out x, out y, out width, out height))
{
return;
}
for (int yy = 0; yy < height; yy++)
{
int *srcRow = src.GetRowPtr(yy);
int *dstRow = dst.GetRowPtr(y + yy);
for (int xx = 0; xx < width; xx++)
{
dstRow[x + xx] = srcRow[xx];
}
}
}
public static void DrawTiled(FastBitmap src, FastBitmap dst,
Rectangle srcRect, Rectangle dstRect)
{
int srcX = srcRect.X, srcWidth = srcRect.Width, srcHeight = srcRect.Height;
int x, y, width, height;
if (!Drawer2DExt.ClampCoords(dst, dstRect, out x, out y, out width, out height))
{
return;
}
for (int yy = 0; yy < height; yy++)
{
// srcY is always 0 so we don't need to add
int *srcRow = src.GetRowPtr(((yy + y) % srcHeight));
int *dstRow = dst.GetRowPtr(y + yy);
for (int xx = 0; xx < width; xx++)
{
dstRow[x + xx] = srcRow[srcX + ((xx + x) % srcWidth)];
}
}
}
