Java Question Copy part of bitmap

[XverhelstX]

Hello,

I need to copy a part of a bitmap and save it in another bitmap (without the use of the canvas.)
I'm using the following code to get the pixels of the current bitmap and save them in a new bitmap.

public Bitmap extractBitmap(Bitmap source, int x, int y, int width, int height) {
       //Create a same size Bitmap
        Bitmap newBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        
      int[] pixels = new int[width * height];
      
      source.getPixels(pixels, 0, width, x, y, width, height);
       newBitmap.setPixels(pixels, 0, width, 0, 0, width, height);
       
       return newBitmap;
   }

But i keep getting a java.lang.illegalargumentexception: y+height must be <= bitmap.height OR x+width must be <= bitmap.width.

btmpTilt = image.extractBitmap(btmpTilt, x, y, w, h)

x: 44
y: 93
w: 214
h: 209

What I want to do is extract a part of the bitmap (from left: 44, top: 93, with; 214, h 209) and place them on a new bitmap with left: 0 top: 0, width 214, height; 209.)

Kind regards,
Tomas

HELP ME!

 

[thedesolatesoul]

Can you also post the width and height of the source bitmap?
It looks like you are going over the src bitmap's height or width.

 

[XverhelstX]

The width of the source is 300 and height is 225.

Tomas

Sent from my SE Xperia Play using Tapatalk.

 

[thedesolatesoul]

So as you can see y+height > src.height
This means you are trying to get pixels from outside the bitmap region.
Depending on the algorithm you may either not want to go over the limit, or pad it with zeros or boundary pixels.

Sent from my GT-I9000 using Tapatalk

 

[XverhelstX]

Yea, i already know that.
I made a preview of what i try to achieve:

Here's my B4A code:

Sub mnuTilt(x As Int, y As Int, w As Int, h As Int)
   
   Dim btmpBlur As Bitmap
   btmpBlur = canvas1.Bitmap
   btmpBlur = effects.Blur(btmpBlur, 16,0)
   btmpTilt = image.extractBitmap(btmpTilt, x, y, w, h)
   
   btmpFlower = blend.blend(btmpBlur, btmpTilt, x, y)
   Panel1.SetBackgroundImage(btmpFlower)
End Sub

Sub Panel1_Touch (Action As Int, X As Float, Y As Float)
   
   If Action = Activity.ACTION_DOWN Then
        sx = X
        sy = Y
    Else
        If Action = Activity.ACTION_MOVE Then
            'Draw the new rectangle
            Rect1.Left = Min(sx, X)
            Rect1.Right = Max(sx, X)
            Rect1.Top = Min(sy, Y)
            Rect1.Bottom = Max(sy, Y)
        End If
        
    End If
   
   If Action = Activity.ACTION_UP Then
      canvas1.DrawRect(Rect1, Colors.White, False, 1)
      
      Panel1.Invalidate
      mnuTilt(Rect1.Left, Rect1.Top, Rect1.Right, Rect1.Bottom)
   End If


End Sub

It draws a rectangle on the panel, get the x, y w and h and calls mnuTilt.
I get the error on extractBitmap.

Tomas

 

[klaus]

In the mnuTilt routine you are using x, y w width and h height.

The Rect1 definition is x1, y1, x2, y2 !

I think that the call to the mnuTilt routine should be :

mnuTilt(Rect1.Left, Rect1.Top, Rect1.Right - Rect1.Left, Rect1.Bottom - Rect1.Top)

Best regards.

 

[XverhelstX]

I see, thanks Klaus.
I thought i read somewhere that right and bottom where the same as width and height.

Thanks,

Tomas

 

[klaus]

In Basic4PPC a rectangle is defined by x, y, w, h.
But not in B4Android.

Best regards.

 

[BarrySumpter]

Is there a b4a equivalent?

 

[klaus]

What do you mean with Is there a b4a equivalent?
In Basic4Android a rectangle is defined by x1, y1, x2, y2 and in
Basic4PPC it is defined by x1, y1, w, h.

The definitions are not the same.

Best regards.

 

[BarrySumpter]

What do you mean by What do you mean? ;p
ExtractBitmap
Yes there is and Answered in another thread.

All my best