basebitmap::ScaleBicubic ignores alpha?

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 22/04/2005 at 08:08, xxxxxxxx wrote:

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Hi there,

I've a problem with the ScaleBicubic()-function of BaseBitmap. Is it meant that the function doesnt scale and copy the alpha-channels, or is it a bug?

The ScaleIt()-function scales and copies the alpha-channels well. Why not the bicubic-function?

many thanks in advance!

Greetings
-Philipp Lensing

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 03/05/2005 at 02:41, xxxxxxxx wrote:

I can't confirm this in 9.1. As long as the alpha channel exists in the destination (AddChannel() has been called), the alpha is scaled as well:

    
    
      AutoAlloc<BaseBitmap> bm;
    
    
    
    
      bm->Init(32,32);  
      bm->Clear(30, 50, 80);  
      LONG achn = bm->AddChannel(TRUE, TRUE);  
      for (LONG x = 0; x < 32; ++x)  
        for (LONG y = 0; y < 32; ++y)  
          bm->SetAlphaPixel(achn, x, y, x+2*y);
    
    
    
    
      ShowBitmap(bm);  
      MessageDialog("1");
    
    
    
    
      AutoAlloc<BaseBitmap> bm2;  
      bm2->Init(64,64);  
      bm2->AddChannel(TRUE, TRUE);
    
    
    
    
      bm->ScaleBicubic(bm2, 0, 0, 31, 31, 0, 0, 63, 63);
    
    
    
    
      ShowBitmap(bm2);  
      MessageDialog("2");