🚀 go-pugleaf

Jens Gruschel wrote:
> Just an additional note: Instead of iterating over all pixels manually 
> you can use the AlphaBlend WinAPI function, something like:

I tried this one too, and it still did not resolve my problem.

In the meantime I also encountered a similar problem with a JPEG so 
perhaps my difficulty is finally NOT due to the PNG alpha channel, but 
due to something else?

What I am doing is the following:

Step 1
------
Depending on the data type of the source stream create either a 
TJpegImage or a TPngGraphic

   grph := TJpegImage.Create;
  or
   grph := TPngGraphic.Create;


Step 2
------
Load the respective graphic from the source stream

   grph.LoadFromStream()

Step 3
------
Create a TPicture as a holding container

   fPicture := TPicture.Create;
   fPicture.Graphic := grph;

Step 4
------
Create a small size thumbnail

   thumb := TBitmap.Create;
   thumb.Canvas.StretchDraw(.. grph);

Step 5
------
Assign the thumbnail to a TImage on my form

   MyForm.Image1.Picture.Bitmap.Handle := thumb.ReleaseHandle;


Given that the problem is perhaps not due to the PNG alpha channel, the 
only other areas where I can imagine problems are Step 4 and Step 5

Any further thoughts?

AndrewFG