checking in all the old panacean stuff
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270
puttysrc/ICONS/ICON.PL
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270
puttysrc/ICONS/ICON.PL
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#!/usr/bin/perl
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# Take a collection of input image files and convert them into a
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# multi-resolution Windows .ICO icon file.
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#
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# The input images can be treated as having four different colour
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# depths:
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#
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# - 24-bit true colour
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# - 8-bit with custom palette
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# - 4-bit using the Windows 16-colour palette (see comment below
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# for details)
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# - 1-bit using black and white only.
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#
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# The images can be supplied in any input format acceptable to
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# ImageMagick, but their actual colour usage must already be
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# appropriate for the specified mode; this script will not do any
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# substantive conversion. So if an image intended to be used in 4-
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# or 1-bit mode contains any colour not in the appropriate fixed
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# palette, that's a fatal error; if an image to be used in 8-bit
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# mode contains more than 256 distinct colours, that's also a fatal
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# error.
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#
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# Command-line syntax is:
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#
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# icon.pl -depth imagefile [imagefile...] [-depth imagefile [imagefile...]]
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#
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# where `-depth' is one of `-24', `-8', `-4' or `-1', and tells the
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# script how to treat all the image files given after that option
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# until the next depth option. For example, you might execute
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#
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# icon.pl -24 48x48x24.png 32x32x24.png -8 32x32x8.png -1 monochrome.png
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#
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# to build an icon file containing two differently sized 24-bit
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# images, one 8-bit image and one black and white image.
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#
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# Windows .ICO files support a 1-bit alpha channel on all these
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# image types. That is, any pixel can be either opaque or fully
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# transparent, but not partially transparent. The alpha channel is
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# separate from the main image data, meaning that `transparent' is
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# not required to take up a palette entry. (So an 8-bit image can
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# have 256 distinct _opaque_ colours, plus transparent pixels as
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# well.) If the input images have alpha channels, they will be used
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# to determine which pixels of the icon are transparent, by simple
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# quantisation half way up (e.g. in a PNG image with an 8-bit alpha
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# channel, alpha values of 00-7F will be mapped to transparent
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# pixels, and 80-FF will become opaque).
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# The Windows 16-colour palette consists of:
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# - the eight corners of the colour cube (000000, 0000FF, 00FF00,
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# 00FFFF, FF0000, FF00FF, FFFF00, FFFFFF)
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# - dim versions of the seven non-black corners, at 128/255 of the
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# brightness (000080, 008000, 008080, 800000, 800080, 808000,
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# 808080)
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# - light grey at 192/255 of full brightness (C0C0C0).
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%win16pal = (
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"\x00\x00\x00\x00" => 0,
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"\x00\x00\x80\x00" => 1,
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"\x00\x80\x00\x00" => 2,
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"\x00\x80\x80\x00" => 3,
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"\x80\x00\x00\x00" => 4,
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"\x80\x00\x80\x00" => 5,
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"\x80\x80\x00\x00" => 6,
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"\xC0\xC0\xC0\x00" => 7,
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"\x80\x80\x80\x00" => 8,
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"\x00\x00\xFF\x00" => 9,
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"\x00\xFF\x00\x00" => 10,
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"\x00\xFF\xFF\x00" => 11,
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"\xFF\x00\x00\x00" => 12,
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"\xFF\x00\xFF\x00" => 13,
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"\xFF\xFF\x00\x00" => 14,
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"\xFF\xFF\xFF\x00" => 15,
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);
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@win16pal = sort { $win16pal{$a} <=> $win16pal{$b} } keys %win16pal;
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# The black and white palette consists of black (000000) and white
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# (FFFFFF), obviously.
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%win2pal = (
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"\x00\x00\x00\x00" => 0,
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"\xFF\xFF\xFF\x00" => 1,
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);
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@win2pal = sort { $win16pal{$a} <=> $win2pal{$b} } keys %win2pal;
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@hdr = ();
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@dat = ();
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$depth = undef;
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foreach $_ (@ARGV) {
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if (/^-(24|8|4|1)$/) {
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$depth = $1;
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} elsif (defined $depth) {
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&readicon($_, $depth);
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} else {
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$usage = 1;
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}
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}
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if ($usage || length @hdr == 0) {
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print "usage: icon.pl ( -24 | -8 | -4 | -1 ) image [image...]\n";
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print " [ ( -24 | -8 | -4 | -1 ) image [image...] ...]\n";
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exit 0;
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}
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# Now write out the output icon file.
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print pack "vvv", 0, 1, scalar @hdr; # file-level header
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$filepos = 6 + 16 * scalar @hdr;
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for ($i = 0; $i < scalar @hdr; $i++) {
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print $hdr[$i];
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print pack "V", $filepos;
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$filepos += length($dat[$i]);
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}
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for ($i = 0; $i < scalar @hdr; $i++) {
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print $dat[$i];
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}
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sub readicon {
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my $filename = shift @_;
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my $depth = shift @_;
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my $pix;
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my $i;
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my %pal;
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# Determine the icon's width and height.
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my $w = `identify -format %w $filename`;
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my $h = `identify -format %h $filename`;
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# Read the file in as RGBA data. We flip vertically at this
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# point, to avoid having to do it ourselves (.BMP and hence
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# .ICO are bottom-up).
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my $data = [];
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open IDATA, "convert -flip -depth 8 $filename rgba:- |";
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push @$data, $rgb while (read IDATA,$rgb,4,0) == 4;
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close IDATA;
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# Check we have the right amount of data.
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$xl = $w * $h;
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$al = scalar @$data;
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die "wrong amount of image data ($al, expected $xl) from $filename\n"
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unless $al == $xl;
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# Build the alpha channel now, so we can exclude transparent
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# pixels from the palette analysis. We replace transparent
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# pixels with undef in the data array.
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#
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# We quantise the alpha channel half way up, so that alpha of
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# 0x80 or more is taken to be fully opaque and 0x7F or less is
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# fully transparent. Nasty, but the best we can do without
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# dithering (and don't even suggest we do that!).
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my $x;
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my $y;
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my $alpha = "";
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for ($y = 0; $y < $h; $y++) {
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my $currbyte = 0, $currbits = 0;
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for ($x = 0; $x < (($w+31)|31)-31; $x++) {
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$pix = ($x < $w ? $data->[$y*$w+$x] : "\x00\x00\x00\xFF");
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my @rgba = unpack "CCCC", $pix;
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$currbyte <<= 1;
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$currbits++;
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if ($rgba[3] < 0x80) {
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if ($x < $w) {
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$data->[$y*$w+$x] = undef;
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}
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$currbyte |= 1; # MS has the alpha channel inverted :-)
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} else {
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# Might as well flip RGBA into BGR0 while we're here.
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if ($x < $w) {
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$data->[$y*$w+$x] = pack "CCCC",
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$rgba[2], $rgba[1], $rgba[0], 0;
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}
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}
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if ($currbits >= 8) {
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$alpha .= pack "C", $currbyte;
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$currbits -= 8;
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}
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}
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}
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# For an 8-bit image, check we have at most 256 distinct
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# colours, and build the palette.
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%pal = ();
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if ($depth == 8) {
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my $palindex = 0;
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foreach $pix (@$data) {
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next unless defined $pix;
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$pal{$pix} = $palindex++ unless defined $pal{$pix};
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}
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die "too many colours in 8-bit image $filename\n" unless $palindex <= 256;
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} elsif ($depth == 4) {
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%pal = %win16pal;
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} elsif ($depth == 1) {
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%pal = %win2pal;
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}
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my $raster = "";
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if ($depth < 24) {
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# For a non-24-bit image, flatten the image into one palette
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# index per pixel.
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$pad = 32 / $depth; # number of pixels to pad scanline to 4-byte align
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$pmask = $pad-1;
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for ($y = 0; $y < $h; $y++) {
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my $currbyte = 0, $currbits = 0;
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for ($x = 0; $x < (($w+$pmask)|$pmask)-$pmask; $x++) {
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$currbyte <<= $depth;
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$currbits += $depth;
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if ($x < $w && defined ($pix = $data->[$y*$w+$x])) {
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if (!defined $pal{$pix}) {
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$pixhex = sprintf "%02x%02x%02x", unpack "CCC", $pix;
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die "illegal colour value $pixhex at pixel ($x,$y) in $filename\n";
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}
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$currbyte |= $pal{$pix};
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}
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if ($currbits >= 8) {
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$raster .= pack "C", $currbyte;
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$currbits -= 8;
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}
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}
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}
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} else {
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# For a 24-bit image, reverse the order of the R,G,B values
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# and stick a padding zero on the end.
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#
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# (In this loop we don't need to bother padding the
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# scanline out to a multiple of four bytes, because every
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# pixel takes four whole bytes anyway.)
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for ($i = 0; $i < scalar @$data; $i++) {
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if (defined $data->[$i]) {
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$raster .= $data->[$i];
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} else {
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$raster .= "\x00\x00\x00\x00";
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}
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}
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$depth = 32; # and adjust this
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}
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# Prepare the icon data. First the header...
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my $data = pack "VVVvvVVVVVV",
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40, # size of bitmap info header
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$w, # icon width
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$h*2, # icon height (x2 to indicate the subsequent alpha channel)
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1, # 1 plane (common to all MS image formats)
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$depth, # bits per pixel
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0, # no compression
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length $raster, # image size
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0, 0, 0, 0; # resolution, colours used, colours important (ignored)
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# ... then the palette ...
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if ($depth <= 8) {
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my $ncols = (1 << $depth);
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my $palette = "\x00\x00\x00\x00" x $ncols;
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foreach $i (keys %pal) {
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substr($palette, $pal{$i}*4, 4) = $i;
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}
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$data .= $palette;
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}
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# ... the raster data we already had ready ...
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$data .= $raster;
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# ... and the alpha channel we already had as well.
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$data .= $alpha;
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# Prepare the header which will represent this image in the
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# icon file.
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my $header = pack "CCCCvvV",
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$w, $h, # width and height (this time the real height)
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1 << $depth, # number of colours, if less than 256
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0, # reserved
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1, # planes
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$depth, # bits per pixel
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length $data; # size of real icon data
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push @hdr, $header;
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push @dat, $data;
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}
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