D3DXSaveSurfaceToFile PNG format broken in Apr 06 SDK?

D3DXSaveSurfaceToFile PNG format broken in Apr 06 SDK?

• m.schlestein

  Hi,

  Can you repro this issue using texconv For instance, say you have texture in a bmp file: imagefile.bmp. Then you can do the following:
  texconv imagefile.bmp -ft png

  Does the imagefile.png file contain what it should If not please send both files to directx@microsoft.com. If you have further issues, would you provide enough details for us to reproduce the issue so we can debug it

  Thanks,
  Ben

  
  

• NickChadwick

  Hi Ben,

  
  The texconv command worked fine, converted to png with no problems. I sent you an email with a tiny test routine which demonstrates the problem.
  

  
  Thanks
  Joe
  

  
  

• tosun

  Hi Joe,

  I've looked into your issue and have found that alpha channel == 0.0 for the pixels in the front buffer. We used to ignore the alpha channel b/c some content tools exported alpha == 0.0 for pngs, but now we use it if it's there. You can do a LoadSurfaceFromSurface() to an X8R8G8B8 surface to make your files like they were before.

  Ben

  
  

• Yevgeniy K

  Hi Joe,

  I'm still waiting for the email to percolate through the system to me. When it does I'll post a followup here.

  Thanks for the repro,

  Ben

  
  

• mentally_disturbed

  Thanks Ben. I had to use a similar trick to "repair" BMP output from SaveSurfaceToFile, as it was writing 32-bit BMPs, which alot of paint programs do not like.
  

  
  
• D3DXSaveSurfaceToFile PNG format broken in Apr 06 SDK?