B4A Library [B4X] BitmapCreator Effects

Erel · May 30, 2018

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:

B4X:

'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 · Feb 19, 2020

Fixed.

Dadaista · Jun 10, 2020

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

Erel · Jun 10, 2020

Use the source code and add this line to Greyscale:

B4X:

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 · Jun 10, 2020

Thank you @Erel !!

Dadaista · Jun 12, 2020

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

B4X:

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 · Jun 14, 2020

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

Dadaista · Jun 14, 2020

How can I catch it?

Erel · Jun 14, 2020

With a Try / Catch block.

Dadaista · Jun 14, 2020

I will look for an example.
Thx @Erel

ilan · Oct 7, 2020

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

thanx

klaus · Oct 7, 2020

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

Erel · Oct 7, 2020

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 · Oct 7, 2020

klaus said:
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.

Erel said:
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 · Oct 7, 2020

ilan said:
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 · Apr 29, 2021

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 · Apr 29, 2021

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

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

Regards,

Anand

Erel · Apr 30, 2021

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 · Apr 30, 2021

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 · Apr 30, 2021

Ok. Understood.

I am getting old for sure .

Regards,

Anand

Pitag · Aug 5, 2021

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:

B4X:

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

B4X:

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)

B4A Library [B4X] BitmapCreator Effects

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