Dan Connelly wrote:
> Nicolas Calimet wrote:
>>> 1. In the preview window black comes up as transparent, so the 
>>> underlying
>>> windows are visible. That is of course anoying.
>>
>>     Which version of POV-Ray are you using?  If 3.6.x, are you talking 
>> about
>> the background color of the preview display or any black pixel in the 
>> rendered
>> image?
> 
> I have the same issue: the preview display is OR'ed with background pixels.
> 
> preview on black: okay
> preview on white: invisible
> 
> Dan

I managed to kluge a fix to this by suppressing alpha values in the SetPixel and
SetPixelScaled routines.  I'm not sure why one would want to write alpha to the X
display.

These diffs are to the 3.7 beta 28 code.

% diff -c disp_sdl.cpp*
*** disp_sdl.cpp	Tue Sep 30 18:25:52 2008
--- disp_sdl.cpp~	Mon Aug  4 09:11:02 2008
***************
*** 298,306 ****
   	{
   		Uint8 *p = (Uint8 *) m_display->pixels + y * m_display->pitch + x *
m_display->format->BytesPerPixel;

! 		// Uint32 sdl_col = SDL_MapRGBA(m_display->format, colour.red, colour.green,
colour.blue, colour.alpha);
! 		// djconnel: 30 Sep 2008:
! 		Uint32 sdl_col = SDL_MapRGBA(m_display->format, colour.red, colour.green,
colour.blue, (unsigned char) 0);

   		switch (m_display->format->BytesPerPixel)
   		{
--- 298,304 ----
   	{
   		Uint8 *p = (Uint8 *) m_display->pixels + y * m_display->pitch + x *
m_display->format->BytesPerPixel;

! 		Uint32 sdl_col = SDL_MapRGBA(m_display->format, colour.red, colour.green,
colour.blue, colour.alpha);

   		switch (m_display->format->BytesPerPixel)
   		{
***************
*** 346,354 ****
   		r = (r*m_PxCount[ofs] + colour.red  ) / (m_PxCount[ofs]+1);
   		g = (g*m_PxCount[ofs] + colour.green) / (m_PxCount[ofs]+1);
   		b = (b*m_PxCount[ofs] + colour.blue ) / (m_PxCount[ofs]+1);
! 		// djconnel: 30 Sep 2008
! 		//a = (a*m_PxCount[ofs] + colour.alpha) / (m_PxCount[ofs]+1);
! 		a = 0;

   		Uint32 sdl_col = SDL_MapRGBA(m_display->format, r, g, b, a);

--- 344,350 ----
   		r = (r*m_PxCount[ofs] + colour.red  ) / (m_PxCount[ofs]+1);
   		g = (g*m_PxCount[ofs] + colour.green) / (m_PxCount[ofs]+1);
   		b = (b*m_PxCount[ofs] + colour.blue ) / (m_PxCount[ofs]+1);
! 		a = (a*m_PxCount[ofs] + colour.alpha) / (m_PxCount[ofs]+1);

   		Uint32 sdl_col = SDL_MapRGBA(m_display->format, r, g, b, a);

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