B4A Library [B4X] BitmapCreator Effects

BitmapCreatorEffects class includes all kinds of very simple to use image effects.
The class is cross platform and compatible with B4J (v6.3+), B4A (v8.3+) and B4i (v5.0+).
Example:

'Greyscale an image:
Dim GreyImage As B4XBitmap = effects.GreyScale(ExistingBmp)
'Blur an image:
Dim BlurImage As B4XBitmap = effects.Blur(ExistingBmp)

The attached examples demonstrate the various methods.


Updates

v1.40 - Adds support for B4XImageViews (XUI Views).
- New ScaleDownImages flag. True by default. The updated example demonstrates the usage. Note that if not using B4XImageView then you should set the image when ScaleDown = False, with XUIViewsUtils.SetBitmapAndFill.
v1.31 -New FadeBorders effect. See post #9: https://www.b4x.com/android/forum/threads/b4x-bitmapcreator-effects.93608/#post-672188
v1.21 - New ReplaceColor method.
v1.20 - Added PieceSize to ImplodeAnimated and added FlipVertical and FlipHorizontal methods.
v1.10 - Adds TransitionAnimated method to transition between two bitmaps.

 

[Erel]

Fixed.

 

[Dadaista]

Hi
Can be added Only black and White (not greyscale)

 

[Erel]

Use the source code and add this line to Greyscale:

Public Sub GreyScale (bmp As B4XBitmap) As B4XBitmap
    Dim bc As BitmapCreator = CreateBC(bmp)
    Dim argb As ARGBColor
    For x = 0 To bc.mWidth - 1
        For y = 0 To bc.mHeight - 1
            bc.GetARGB(x, y, argb)
            Dim c As Int = argb.r * 0.21 + argb.g * 0.72 + 0.07 * argb.b
            If c < 127 Then c = 0 Else c = 255 '<--------------------------------
            argb.r = c
            argb.g = c
            argb.b = c
            bc.SetARGB(x, y, argb)
        Next
    Next
    Return bc.Bitmap
End Sub

 

[Dadaista]

Thank you @Erel !!

 

[Dadaista]

Hi

There are problems with .BMP files with "profundidad de bits" = 16 maybe "bit depth" in English. The files does not load and crash

the log Says

java.lang.IllegalArgumentException: src cannot be null

I Think could be related to Bitmapcreator

The copy of the project failing is too large for upload. Is here
I Have added two .bmp files. One file with 16 bits and another one with 32 bits

1 bit works
16 bits no works
32 bits works

How it can be solved?

Thx!!

 

[Erel]

The error is not related to BitmapCreator, as it happens when the bitmap is loaded. The image format is not supported by JavaFX.

 

[Dadaista]

How can I catch it?

 

[Erel]

With a Try / Catch block.

 

[Dadaista]

I will look for an example.
Thx @Erel

 

[ilan]

can i change the alpha level on a bitmap with this library? like settings its alpha to 0.5 ?

thanx

 

[klaus]

You can do it directly with the BitmapCreator library.
You may have a look at the BitmapCreatorDemo1 program from the B4X Graphics Booklets.

 

[Erel]

Another option, if you want to display a semitransparent image: https://www.b4x.com/android/forum/threads/b4x-change-the-views-alpha-level-transparency.123209/

 

[ilan]

You can do it directly with the BitmapCreator library.
You may have a look at the BitmapCreatorDemo1 program from the B4X Graphics Booklets.

thanx klaus i will have a look at it.

Another option, if you want to display a semitransparent image: https://www.b4x.com/android/forum/threads/b4x-change-the-views-alpha-level-transparency.123209/

But this is for a view, i am working with bitmaps. Actually i could load the bitmaps on imageviews and then just change the alpha for that view. This may work. Thanks erel

 

[Erel]

Actually i could load the bitmaps on imageviews and then just change the alpha for that view. This may work. Thanks erel

This will be the best performing solution, as long as you don't need to actually modify the bitmap.

 

[Erel]

v1.40 - Adds support for B4XImageViews (XUI Views).
- New ScaleDownImages flag. True by default. The updated example demonstrates the usage. Note that if not using B4XImageView then you should set the image when ScaleDown = False, with XUIViewsUtils.SetBitmapAndFill.

 

[AnandGupta]

v1.40 - Adds support for B4XImageViews (XUI Views)

Sorry the image above shows same for change color. Am I missing something ?

Regards,

Anand

 

[Erel]

It is more apparent on devices and especially on high density devices.
If you look closely then you will that the upper image edges are more blur.

 

[Sandman]

It might be easier to see with a close-up.

This is the tip of the arrow in the top image at 1600%:

And this is the tip of the bottom arrow at 1600%:

Big difference, as one can see, the bottom image has way higher quality.

 

[AnandGupta]

Ok. Understood.

I am getting old for sure .

Regards,

Anand

 

[Pitag]

I updated the Library to 1.40 (the online version is still reported as 1.31), but i get an error if i try to use B4XImageView instead of regular ImageView. (The reason i did the update was because i need to use B4XImageView)

If i write the line:

effects.ImplodeAnimated(1500, OriginalBmp,B4XImageView1,50)

in the Logs windows i get the warning message: type does not match (warning #22) and if i run the code i get the following error

java.lang.ClassCastException: b4a.example.b4ximageview cannot be cast to android.view.View
    at anywheresoftware.b4a.objects.B4XViewWrapper.asViewWrapper(B4XViewWrapper.java:89)
    at anywheresoftware.b4a.objects.B4XViewWrapper.getTag(B4XViewWrapper.java:583)
    at b4a.example.bitmapcreatoreffects._setbitmap(bitmapcreatoreffects.java:1719)
    at b4a.example.bitmapcreatoreffects$ResumableSub_TransitionAnimated.resume(bitmapcreatoreffects.java:710)
    at b4a.example.bitmapcreatoreffects._transitionanimated(bitmapcreatoreffects.java:530)
    at b4a.example.main._button2_click(main.java:459)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:732)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:348)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:144)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:197)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:193)
    at anywheresoftware.b4a.objects.ViewWrapper$1.onClick(ViewWrapper.java:80)
    at android.view.View.performClick(View.java:6291)
    at android.view.View$PerformClick.run(View.java:24931)
    at android.os.Handler.handleCallback(Handler.java:808)
    at android.os.Handler.dispatchMessage(Handler.java:101)
    at android.os.Looper.loop(Looper.java:166)
    at android.app.ActivityThread.main(ActivityThread.java:7529)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:245)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:921)