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Merge pull request #4104 from sylveon/master

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Parallelize matrix convolution and consider transparency in gaussian blurs
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Jaex 2019-04-29 21:28:35 +03:00 committed by GitHub
parent 8677a80768 f770f2338b
commit 79a913d10c
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3 changed files with 36 additions and 6 deletions
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2
ShareX.HelpersLib/ConvolutionMatrix.cs
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@ -33,6 +33,8 @@ public class ConvolutionMatrix
public int Height => matrix.GetLength(0);
public byte Offset { get; set; }
public bool ConsiderAlpha { get; set; }
public ConvolutionMatrix() : this(3)
{
}

34
ShareX.HelpersLib/ConvolutionMatrixManager.cs
View file

@ -29,6 +29,7 @@
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Threading.Tasks;
namespace ShareX.HelpersLib
{
@ -44,13 +45,14 @@ public static Image Apply(this ConvolutionMatrix kernel, Image img)
int originX = (kernel.Width - 1) / 2;
int originY = (kernel.Height - 1) / 2;
for (int y = 0; y < source.Height; y++)
Parallel.For(0, source.Height, y =>
{
for (int x = 0; x < source.Width; x++)
Parallel.For(0, source.Width, x =>
{
double r = 0.0;
double g = 0.0;
double b = 0.0;
double a = 0.0;
// Apply each matrix multiplier to the color components for each pixel.
for (int fy = 0; fy < kernel.Height; fy++)
@ -72,6 +74,10 @@ public static Image Apply(this ConvolutionMatrix kernel, Image img)
r += kernel[fy, fx] * currentColor.Red;
g += kernel[fy, fx] * currentColor.Green;
b += kernel[fy, fx] * currentColor.Blue;
if (kernel.ConsiderAlpha)
{
a += kernel[fy, fx] * currentColor.Alpha;
}
}
}
@ -84,9 +90,26 @@ public static Image Apply(this ConvolutionMatrix kernel, Image img)
b += kernel.Offset;
b.Clamp(0, 255);
dest.SetPixel(x, y, new ColorBgra((byte)b, (byte)g, (byte)r, source.GetPixel(x, y).Alpha));
}
}
if (kernel.ConsiderAlpha)
{
a += kernel.Offset;
a.Clamp(0, 255);
}
dest.SetPixel(
x,
y,
new ColorBgra(
(byte)b,
(byte)g,
(byte)r,
kernel.ConsiderAlpha
? (byte)a
: source.GetPixel(x, y).Alpha
)
);
});
});
}
return result;
@ -115,6 +138,7 @@ private static double GaussianFunction(double x, double sigma)
public static ConvolutionMatrix GaussianBlur(int height, int width, double sigma)
{
ConvolutionMatrix cm = new ConvolutionMatrix(height, width);
cm.ConsiderAlpha = true;
double sum = 0.0;
double midpointX = (width - 1) / 2.0;

6
ShareX.ImageEffectsLib/Filters/GaussianBlur.cs
View file

@ -67,7 +67,11 @@ public override Image Apply(Image img)
{
ConvolutionMatrix kernelHoriz = ConvolutionMatrixManager.GaussianBlur(1, size, sigma);
ConvolutionMatrix kernelVert = new ConvolutionMatrix(size, 1);
ConvolutionMatrix kernelVert = new ConvolutionMatrix(size, 1)
{
ConsiderAlpha = kernelHoriz.ConsiderAlpha
};
for (int i = 0; i < size; i++)
{
kernelVert[i, 0] = kernelHoriz[0, i];