Editing msk - FilterMeisterWiki

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= msk =

== Syntax ==
{{int msk(int x, int y)}}

== Arguments ==
:'''x'''
::Horizontal coordinate of the requested mask pixel, starting from the left at 0.
:'''y'''
::Vertical coordinate of the requested mask pixel, starting from the top at 0.

== Return ==
The mask value for the requested pixel in the range [0, 255] (regardless of whether the color depth of the source image).
0 means the pixel is completely outside the selection mask, 255 means the pixel is completely inside the selection mask.

== Description ==
Use this function to determine whether a pixel is inside, outside or somewhere on the edge of the host application's selection mask.

== Comments ==
By default, FilterMeister automatically applies the selection mask to pixels for the final render; you only need to check the mask to render a correct preview inside FilterMeister. Nonetheless, if you use a msk(..) == 0 check, you can increase performance by not calculating pixels outside the selection mask.

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

ForEveryTile: {
  for (x = x_start; x < x_end; x++) {
   for (y = y_start; y < y_end; y++) {
    m = msk(x, y);
    if (m == 0)continue; //speed up

for (z = 0; z < 3; z++) { //don't process alpha
     int s = src(x, y, z);
     if (doingProxy)
      pset(x, y, z, mix(255 - s, s, m, 255)); //if you wish, apply mask on preview
     else 
      pset(x, y, z, s); //the mask is applied after pressing ok
    }//end for z
   }//end for y
  }//end for x
  return true;
 }//end ForEveryTile
</code>

== See Also ==
((haveMask))

Summary of change:
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