Is it possible to achieve bitmap transparency in android?
lazarus / 43-Android

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stab · 2013-04-08 10:30

Hi,

Tried the following with no luck:
  Bitmap:= TBitmap.Create;
  Bitmap.LoadFromFile('MyBitmap.bmp');
  Bitmap.Transparent := true;
  Bitmap.TransparentColor:=Bitmap.Canvas.Pixels[0, 0];

  PaintBox1.Canvas.Draw(
    (PaintBox1.Width  - Bitmap.Width) div 2,
    (PaintBox1.Height  - Bitmap.Height) div 2,
     Bitmap);

Am I doing something wrong or is transparency not possible in android?

/stab

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felipemdc · 2013-04-08 17:16

Possibly a missing feature.

If you use TLazIntfImage then you can have alpha transparency: http://
wiki.freepascal.org/Developing_with_Graphics#Working_with_TLazIntfImag
e.2C_TRawImage_and_TLazCanvas

TLazCanvas has some special blending routines which support color
transparency among other things.

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stab · 2013-04-09 05:32

Thanks alot for answering felipemdc, I'll try your suggestion.

/stab