msk

Syntax

int msk(int x, int y)

Arguments

Horizontal coordinate of the requested mask pixel, starting from the left at 0.

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

%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

msk