To increase the speed of rendering?

[Estorva]

Why hello here! So, I was building my plugin with Boltbait's CodeLab, the the speed of rendering is too slow for me.

 

The plugin I was making will be used to make a pixel transparent depending on its brightness/darkness, while one can set the range of transparency gradient. That is:

And the code:

Hidden Content:

#region UICode
int Amount1 = 0; // [0,255] Start
int Amount2 = 255; // [0,255] Range
byte Amount3 = 0; // Alpha value depends on...|Brightness|Darkness
bool Amount4 = false; // Convert to grayscale before alpha filting
#endregion

public byte Pick(double Vxx)
{
	if ( Amount1 > Vxx )
	return 0;
	else if ( Vxx <= Amount1 + Amount2 )
	return (byte)Math.Ceiling((float) (Vxx-Amount1)*255/Amount2);
	else
	return 255;
}

public double Grscl(byte VxR, byte VxG, byte VxB)
{
	return (double)Math.Ceiling(VxR*0.2988-0.4516-0.4999+VxG*0.5863-0.3252-0.4999+VxB*0.1137-0.4669-0.4999);
}

void Render(Surface dst, Surface src, Rectangle rect)
{
	Rectangle selct = EnvironmentParameters.GetSelection(src.Bounds).GetBoundsInt();
	ColorBgra CurrentPixel;
	
	for (int y = selct.Top; y < selct.Bottom; y++)
	{
		for (int x = selct.Left; x < selct.Right; x++)
		{
			CurrentPixel = src[x,y];
			
			if ( Amount4 == false )
			{
				if ( Amount3 == 0 )
				CurrentPixel.A = Pick(HsvColor.FromColor(CurrentPixel.ToColor()).Value*2.55);
				else
				CurrentPixel.A = Pick(255-HsvColor.FromColor(CurrentPixel.ToColor()).Value*2.55);
			}
			else
			{
				if ( Amount3 == 0 )
				CurrentPixel.A = Pick(Grscl(CurrentPixel.R, CurrentPixel.G, CurrentPixel.);
				else
				CurrentPixel.A = Pick(255-Grscl(CurrentPixel.R, CurrentPixel.G, CurrentPixel.);
			}
			
			dst[x,y] = CurrentPixel;
		}
	}
}

 

I don't know which part makes the plugin render slowly. But once the problem is solved, this plugin will be very useful for diffusion effect.

Edited August 17, 2014 by Estorva

[midora]

You are iterating <selct> but the render function has to generate all pixels in <rect>.

Render() will be called multiple times with small rectangle slices to generate the selected part of the image.

[BoltBait]

Try like this:

 

#region UICode
int Amount1 = 0; // [0,255] Start
int Amount2 = 255; // [0,255] Range
byte Amount3 = 0; // Alpha value depends on...|Brightness|Darkness
bool Amount4 = false; // Convert to grayscale before alpha filting
#endregion

public byte Pick(double Vxx)
{
    if (Amount1 > Vxx)
        return 0;
    else if (Vxx <= Amount1 + Amount2)
        return (byte)Math.Ceiling((float) (Vxx-Amount1)*255/Amount2);
    else
        return 255;
}

public double Grscl(byte VxR, byte VxG, byte VxB)
{
    return (double)Math.Ceiling(VxR*0.2988-0.4516-0.4999+VxG*0.5863-0.3252-0.4999+VxB*0.1137-0.4669-0.4999);
}

void Render(Surface dst, Surface src, Rectangle rect)
{
    ColorBgra CurrentPixel;
    for (int y = rect.Top; y < rect.Bottom; y++)
    {
        if (IsCancelRequested) return;
        for (int x = rect.Left; x < rect.Right; x++)
        {
            CurrentPixel = src[x,y];
            if (Amount4 == false)
            {
                if (Amount3 == 0)
                {
                    CurrentPixel.A = Pick(HsvColor.FromColor(CurrentPixel.ToColor()).Value*2.55);
                }
                else
                {
                    CurrentPixel.A = Pick(255-HsvColor.FromColor(CurrentPixel.ToColor()).Value*2.55);
                }
            }
            else
            {
                if (Amount3 == 0)
                {
                    CurrentPixel.A = Pick(Grscl(CurrentPixel.R, CurrentPixel.G, CurrentPixel.);
                }
                else
                {
                    CurrentPixel.A = Pick(255-Grscl(CurrentPixel.R, CurrentPixel.G, CurrentPixel.);
                }
            }
            dst[x,y] = CurrentPixel;
        }
    }
}

Basically, you changed the loops are are iterating over the entire selection instead of only the rectangle passed to you by Paint.NET.

You should probably review the tutorials starting here:

http://boltbait.com/pdn/CodeLab/help/overview.php

There are other ways to speed this up even further, but I don't think you'll need to go any further.

BTW, I have a very similar plugin in my pack called Effects > Object > Switch Gray to Alpha. It's just not adjustable. Try it on a black-to-white gradient to see what it does.

[Estorva]

Yeah it's faster than before. Thanks for help!

By the way, when I have two different plugins installed, there are actually two "same" plugins in the menu. Same title and same icon.

Both of them are made by me with CodeLab, and I have no idea why this could happen.

[BoltBait]

Time to clean out your plugin folder.

[Estorva]

Time to clean out your plugin folder.

I don't get it. Here's what's actually happening.

There are two "duplicated" alpha filters, but I have only one alpha filter installed.

[TechnoRobbo]

Same plugin with two different DLL names

Look for similar names with slight variations in your effects folder

Delete the older one