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Added fast box blur method

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This commit is contained in:
Jaex 2016-11-13 19:33:53 +03:00
parent 1d9b1a07c8
commit cab2ec0b2b
5 changed files with 124 additions and 20 deletions
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133
ShareX.HelpersLib/Helpers/ImageHelpers.cs
View file

@ -696,7 +696,7 @@ public static Bitmap AddShadow(Image img, float opacity, int size, float darknes
if (size > 0)
{
Blur((Bitmap)shadowImage, size);
FastBoxBlur((Bitmap)shadowImage, size);
}
if (darkness > 1)
@ -860,7 +860,7 @@ public static void HighlightImage(Bitmap bmp, Rectangle rect, Color highlightCol
}
}
public static void PixelateImage(Bitmap bmp, int pixelSize)
public static void Pixelate(Bitmap bmp, int pixelSize)
{
if (pixelSize > 1)
{
@ -904,6 +904,123 @@ public static void PixelateImage(Bitmap bmp, int pixelSize)
}
}
// http://incubator.quasimondo.com/processing/superfast_blur.php
public static void FastBoxBlur(Bitmap bmp, int radius)
{
if (radius < 1) return;
using (UnsafeBitmap unsafeBitmap = new UnsafeBitmap(bmp, true))
{
int w = unsafeBitmap.Width;
int h = unsafeBitmap.Height;
int wm = w - 1;
int hm = h - 1;
int wh = w * h;
int div = radius + radius + 1;
byte[] r = new byte[wh];
byte[] g = new byte[wh];
byte[] b = new byte[wh];
byte[] a = new byte[wh];
int rsum, gsum, bsum, asum, x, y, i, p, p1, p2, yp, yi, yw;
int[] vmin = new int[Math.Max(w, h)];
int[] vmax = new int[Math.Max(w, h)];
byte[] dv = new byte[256 * div];
for (i = 0; i < 256 * div; i++)
{
dv[i] = (byte)(i / div);
}
yw = yi = 0;
for (y = 0; y < h; y++)
{
rsum = gsum = bsum = asum = 0;
for (i = -radius; i <= radius; i++)
{
p = (yi + Math.Min(wm, Math.Max(i, 0)));
ColorBgra color = unsafeBitmap.GetPixel(p);
rsum += color.Red;
gsum += color.Green;
bsum += color.Blue;
asum += color.Alpha;
}
for (x = 0; x < w; x++)
{
r[yi] = dv[rsum];
g[yi] = dv[gsum];
b[yi] = dv[bsum];
a[yi] = dv[asum];
if (y == 0)
{
vmin[x] = Math.Min(x + radius + 1, wm);
vmax[x] = Math.Max(x - radius, 0);
}
p1 = (yw + vmin[x]);
p2 = (yw + vmax[x]);
ColorBgra color1 = unsafeBitmap.GetPixel(p1);
ColorBgra color2 = unsafeBitmap.GetPixel(p2);
rsum += color1.Red - color2.Red;
gsum += color1.Green - color2.Green;
bsum += color1.Blue - color2.Blue;
asum += color1.Alpha - color2.Alpha;
yi++;
}
yw += w;
}
for (x = 0; x < w; x++)
{
rsum = gsum = bsum = asum = 0;
yp = -radius * w;
for (i = -radius; i <= radius; i++)
{
yi = Math.Max(0, yp) + x;
rsum += r[yi];
gsum += g[yi];
bsum += b[yi];
asum += a[yi];
yp += w;
}
yi = x;
for (y = 0; y < h; y++)
{
ColorBgra color = new ColorBgra(dv[bsum], dv[gsum], dv[rsum], dv[asum]);
unsafeBitmap.SetPixel(yi, color);
if (x == 0)
{
vmin[y] = Math.Min(y + radius + 1, hm) * w;
vmax[y] = Math.Max(y - radius, 0) * w;
}
p1 = x + vmin[y];
p2 = x + vmax[y];
rsum += r[p1] - r[p2];
gsum += g[p1] - g[p2];
bsum += b[p1] - b[p2];
asum += a[p1] - a[p2];
yi += w;
}
}
}
}
public static string OpenImageFileDialog()
{
string[] images = OpenImageFileDialog(false);
@ -1154,18 +1271,6 @@ public static void DrawColorPickerIcon(Graphics g, Color color, Rectangle rect,
return img;
}
public static void Blur(Bitmap sourceImage, int radius)
{
if (GDIplus.IsBlurPossible(radius))
{
GDIplus.ApplyBlur(sourceImage, new Rectangle(0, 0, sourceImage.Width, sourceImage.Height), radius, false);
}
else
{
ImageHelper.ApplyBoxBlur(sourceImage, radius);
}
}
public static Image CreateTornEdge(Image sourceImage, int toothHeight, int horizontalToothRange, int verticalToothRange, AnchorStyles sides)
{
Image result = sourceImage.CreateEmptyBitmap();

2
ShareX.ImageEffectsLib/Filters/Blur.cs
View file

@ -53,7 +53,7 @@ public Blur()
public override Image Apply(Image img)
{
ImageHelpers.Blur((Bitmap)img, Radius);
ImageHelpers.FastBoxBlur((Bitmap)img, Radius);
return img;
}
}

5
ShareX.ImageEffectsLib/Filters/Pixelate.cs
View file

@ -53,9 +53,8 @@ public Pixelate()
public override Image Apply(Image img)
{
Bitmap bmp = (Bitmap)img;
ImageHelpers.PixelateImage(bmp, Size);
return bmp;
ImageHelpers.Pixelate((Bitmap)img, Size);
return img;
}
}
}

2
ShareX.ScreenCaptureLib/Shapes/Effect/BlurEffectShape.cs
View file

@ -80,7 +80,7 @@ public override void OnDrawFinal(Graphics g, Bitmap bmp)
using (Bitmap croppedImage = ImageHelpers.CropBitmap(bmp, rect))
{
ImageHelpers.Blur(croppedImage, BlurRadius);
ImageHelpers.FastBoxBlur(croppedImage, BlurRadius);
g.DrawImage(croppedImage, rect);
}

2
ShareX.ScreenCaptureLib/Shapes/Effect/PixelateEffectShape.cs
View file

@ -80,7 +80,7 @@ public override void OnDrawFinal(Graphics g, Bitmap bmp)
using (Bitmap croppedImage = ImageHelpers.CropBitmap(bmp, rect))
{
ImageHelpers.PixelateImage(croppedImage, PixelSize);
ImageHelpers.Pixelate(croppedImage, PixelSize);
g.DrawImage(croppedImage, rect);
}