Editing set_psetp_mode - FilterMeisterWiki

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= set_psetp_mode =

== Syntax ==
{{void set_psetp_mode(n)}}

== Arguments ==
:'''n'''
::Set '''n''' to 1, if you want to be able to set alpha to 0 with ((psetp)). Set '''n''' to 0 to restore default behavior again.

== Description ==
By default, you can't set the alpha channel to zero with ((psetp)). This is an intended behavior, that allows to use ((psetp)) function in conjuction with ((RGB)) function  without messing up alpha channel ( i.e psetp(x,y,RGB(r,g,b)) ). To cancel this behavior, just do the instruction set_psetp_mode(1).

== Example ==
<code>
%ffp
SupportedModes:RGBMode

// The default color is orange,
// but you can change it with
// sliders

ctl[0]: "R value", Range=(0,255), Val=255
ctl[1]: "G value", Range=(0,255), Val=128
ctl[2]: "B value", Range=(0,255), Val=0

ForEveryTile: {

int color;

// Check if alpha channel available
  if ( Z<4 ) {
    Info("This plug-in needs to "
      "be applied to a layer to "
      "achieve the effect");
    return true;
  }
    
  //------- the important line
  set_psetp_mode(1);
    
  for( y=y_start; y<y_end; y++) {
    for(x=x_start; x<x_end; x++) {

// Chess board pattern
      if( ((x%100)<50) ^ ((y%100)<50) ) {
        a=255;
      } else {
        a=0;
      }
      color = RGBA(ctl(0), ctl(1), ctl(2), a);
      psetp(x,y,color);

} // end for x
  } // end for y

return true;

} // end ForEveryTile
</code>

== See Also ==
((psetp)), ((srcp)), ((pgetp)), ((RGB)), ((RGBA))

== Comments ==
Everyone can add his comments about his experiences with this function here. Tips for using it are welcome, too.

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