OK, I suck. My first code did not properly handle the case of a line that
starts with the fg color, much less an entire line of fg color. Let's try this
again (sorry that Yahoo eats my indentation):
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# This script will take an ASCII PBM B&W file and convert it to a series
# of "DS" (Draw Segment) statements in PCBNEW syntax. The deltaX and deltaY
# is defined in "step" which is in uints of 1/10 mil. The layer is currently
# set to 21, the component layer silkscreen. Swap bg & fg based on whether
# black or white is the foreground.
#
# State 0 : look for magic number - must be P1 (can be P4 for raw file)
# State 1 : look for height & width
# State 2 : process data
# State 3 : done with data - skip the rest
#
BEGIN { state = 0; step = 40; layer = 21; fg = "1"; bg = "0"; }
{if (NR == 1) {
state = 1;
if ($1 != "P1") {
printf("Must supply an ASCII PBM image file\n");
exit 1
}
next;
}
}
/^#/ { next } # Comment line, skip it
{if (state == 1) {
width = $1;
height = $2;
buff = "";
state = 2;
Y = - ((step * height) / 2);
initX = - ((step * width) / 2);
next;
}
}
{if (state == 2) {
buff = buff $1;
if (length( buff ) >= width) {
scanline = substr( buff, 1, width );
buff = substr( buff, width + 1 );
Y += step;
X = initX;
while ( Z1 = index( scanline, fg )) {
scanline = substr( scanline, Z1 );
Z2 = index( scanline, bg );
if (Z2 == 0)
Z2 = length( scanline ) + 1;
scanline = substr( scanline, Z2 );
Z1 = step * Z1 + X;
Z2 = step * Z2 + Z1 - 2 * step;
X = Z2;
printf( "DS %d %d %d %d %d %d\n", Z1, Y, Z2, Y, step, layer );
}
height--;
if (height == 0)
state = 3;
}
}
}
{if (state == 3) { nextfile; }}
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