B4J Question B4J Load large image into ImageView

[js486dog]

I have used the code below to open jpg image.

There is no problem to open not large image.

But I can not open (load into ImageView) large image (w:7800, h:7400).

Please is there a way to load large image into ImageView with B4J ?

My code:

Sub Process_Globals
    Private fx As JFX
    Private MainForm As Form
    Private Button1 As Button
    Dim directory, fileName As String
    Private ImageView1 As ImageView
    Private P_imag As Pane
End Sub

Sub AppStart (Form1 As Form, Args() As String)
    MainForm = Form1
    MainForm.RootPane.LoadLayout("Layout1")
    MainForm.Show
End Sub

Sub Application_Error (Error As Exception, StackTrace As String) As Boolean
    Return True
End Sub

Sub Button1_Click
    Dim fc As FileChooser
    fc.Initialize
    fc.InitialDirectory = File.DirApp
    fc.SetExtensionFilter("Layouts",Array("*.jpg"))
    fc.Title = "photo"
    
    Dim f As String = fc.ShowOpen(MainForm)
    directory = File.GetFileParent(f)
    fileName = File.GetName(f)
    Dim bmp As Image = fx.LoadImage(directory,fileName)

    If f <> "" Then
        
        ImageView1.SetImage(bmp)
        ImageView1.SetSize(bmp.Width, bmp.Height)
    End If
End Sub

 

[emexes]

perhaps this:

 

[js486dog]

perhaps this:

View attachment 96955

Thanks for answer.

This one works fine. Image is loaded into ImageView1.

Dim bmp As Image = fx.LoadImageSample(directory,fileName,300,200)

But this one does not work. Image is not loaded into ImageView1.

Dim bmp As Image = fx.LoadImageSample(directory,fileName,7800,7400)

 

[TILogistic]

Could it be what you are looking for?

[B4X] ZoomImageView - Cross platform zoomable + pannable image view

A custom view that shows an image and allows the user to zoom and pan the image. Instructions: - Add with designer. - Call SetBitmap. Updates: v1.06 - Fixes an issue with Android 15. v1.05 - Base_Resize is public. Call it after resizing the view in B4A. v1.04 - Fixes an issue in B4i where the...

www.b4x.com

 

[TILogistic]

or

xui.LoadBitmapResize

 

[emexes]

I gave big images a go here, tried creating larger and larger ones until something broke:

18600 x 18600 x 24 bit color = at least 1,037,880,000 bytes, or perhaps one-third more if is RGBA.

Then I looked to see if the Java heap could be made larger, and sure enough somebody suggested giving #VirtualMachineArgs a burl:

so I did, and that was the last I heard from my computer for about 8 minutes. It sank to its knees and I was starting to worry.

Anyway, when it blinked I managed to capture this:

and then when it properly regained consciousness I had this:

both of which suggest that the maximum object size, for the JVM on my machine at least, is limited by the maximum value of Java's default signed 32-bit Integer, so the maximum image size would be like 23000 RGBA pixels square.

 

[js486dog]

Could it be what you are looking for?

[B4X] ZoomImageView - Cross platform zoomable + pannable image view

A custom view that shows an image and allows the user to zoom and pan the image. Instructions: - Add with designer. - Call SetBitmap. Updates: v1.06 - Fixes an issue with Android 15. v1.05 - Base_Resize is public. Call it after resizing the view in B4A. v1.04 - Fixes an issue in B4i where the...

www.b4x.com

Thank you very much for the answer.
ZoomImageView is fine.
I can work with large images, but I miss "EventData" (at least MouseMoved).

Classic ImageView has "EventData" (MouseMoved, MouseDragged ...).

Sub ImageView1_MouseMoved (EventData As MouseEvent)
    L_xsur_pix = EventData.X
    L_ysur_pix = EventData.Y
End Sub

 

[js486dog]

or

xui.LoadBitmapResize

Thanks for the answer.

As above.

This works fine.
bmp.Resize(400, 300, True)

This does not work.
bmp.Resize(7800, 7400, True)

 

[emexes]

This does not work.
bmp.Resize(7800, 7400, True)

If you need to handle larger images outside of ZoomImageView, perhaps try increasing the Java heap size using #VirtualMachineArgs attribute:

Use G for gigabytes or M for megabytes.

 

[js486dog]

If you need to handle larger images outside of ZoomImageView, perhaps try increasing the Java heap size using #VirtualMachineArgs attribute:

View attachment 96968

Use G for gigabytes or M for megabytes.

Thank you very much.

#VirtualMachineArgs: -Xms1024m -Xmx1024m

is fine when I start app from B4J IDE.

But after compilation jar to exe (Launch4j) still works only:
bmp.Resize(400, 300, True)
not
bmp.Resize(7800, 7400, True)

 

[js486dog]

Thank you very much.

#VirtualMachineArgs: -Xms1024m -Xmx1024m

is fine when I start app from B4J IDE.

But after compilation jar to exe (Launch4j) still works only:
bmp.Resize(400, 300, True)
not
bmp.Resize(7800, 7400, True)

It seems here is the solution.
Have to be set "heap size" in "Launch4j" to 1024 or another number.
Now exe file works as B4J IDE - also with large image .