+# Takes in an image ID and a set of resolutions, and returns (generates if needed)
+# the smallest mipmap larger than the largest of them, as well as the original image
+# dimensions.
+sub make_mipmap {
+ my ($r, $filename, $id, $dbwidth, $dbheight, $can_use_qscale, @res) = @_;
+ my ($img, $mmimg, $width, $height);
+
+ my $physical_fname = get_disk_location($r, $id);
+
+ # If we don't know the size, we'll need to read it in anyway
+ if (!defined($dbwidth) || !defined($dbheight)) {
+ $img = read_original_image($r, $filename, $id, $dbwidth, $dbheight, $can_use_qscale);
+ $width = $img->Get('columns');
+ $height = $img->Get('rows');
+ } else {
+ $width = $dbwidth;
+ $height = $dbheight;
+ }
+
+ # Generate the list of mipmaps
+ my @mmlist = ();
+
+ my $mmwidth = $width;
+ my $mmheight = $height;
+
+ while ($mmwidth > 1 || $mmheight > 1) {
+ my $new_mmwidth = POSIX::floor($mmwidth / 2);
+ my $new_mmheight = POSIX::floor($mmheight / 2);
+
+ $new_mmwidth = 1 if ($new_mmwidth < 1);
+ $new_mmheight = 1 if ($new_mmheight < 1);
+
+ my $large_enough = 1;
+ for my $i (0..($#res/2)) {
+ my ($xres, $yres) = ($res[$i*2], $res[$i*2+1]);
+ if ($xres == -1 || $xres > $new_mmwidth || $yres > $new_mmheight) {
+ $large_enough = 0;
+ last;
+ }
+ }
+
+ last if (!$large_enough);
+
+ $mmwidth = $new_mmwidth;
+ $mmheight = $new_mmheight;
+
+ push @mmlist, [ $mmwidth, $mmheight ];
+ }
+
+ # Ensure that all of them are OK
+ my $last_good_mmlocation;
+ for my $i (0..$#mmlist) {
+ my $last = ($i == $#mmlist);
+ my $mmres = $mmlist[$i];
+
+ my $mmlocation = get_mipmap_location($r, $id, $mmres->[0], $mmres->[1]);
+ if (! -r $mmlocation or (-M $mmlocation > -M $physical_fname)) {
+ if (!defined($img)) {
+ if (defined($last_good_mmlocation)) {
+ if ($can_use_qscale) {
+ $img = Sesse::pr0n::QscaleProxy->new;
+ } else {
+ $img = Image::Magick->new;
+ }
+ $img->Read($last_good_mmlocation);
+ } else {
+ $img = read_original_image($r, $filename, $id, $dbwidth, $dbheight, $can_use_qscale);
+ }
+ }
+ my $cimg;
+ if ($last) {
+ $cimg = $img;
+ } else {
+ $cimg = $img->Clone();
+ }
+ log_info($r, "Making mipmap for $id: " . $mmres->[0] . " x " . $mmres->[1]);
+ $cimg->Resize(width=>$mmres->[0], height=>$mmres->[1], filter=>'Lanczos', 'sampling-factor'=>'1x1');
+ $cimg->Strip();
+ my $err = $cimg->write(
+ filename => $mmlocation,
+ quality => 95,
+ 'sampling-factor' => '1x1'
+ );
+ $img = $cimg;
+ } else {
+ $last_good_mmlocation = $mmlocation;
+ }
+ if ($last && !defined($img)) {
+ # OK, read in the smallest one
+ if ($can_use_qscale) {
+ $img = Sesse::pr0n::QscaleProxy->new;
+ } else {
+ $img = Image::Magick->new;
+ }
+ my $err = $img->Read($mmlocation);
+ }
+ }
+
+ if (!defined($img)) {
+ $img = read_original_image($r, $filename, $id, $dbwidth, $dbheight, $can_use_qscale);
+ $width = $img->Get('columns');
+ $height = $img->Get('rows');
+ }
+ return ($img, $width, $height);
+}
+
+sub read_original_image {
+ my ($r, $filename, $id, $dbwidth, $dbheight, $can_use_qscale) = @_;
+
+ my $physical_fname = get_disk_location($r, $id);
+
+ # Read in the original image
+ my $magick;
+ if ($can_use_qscale && ($filename =~ /\.jpeg$/i || $filename =~ /\.jpg$/i)) {
+ $magick = Sesse::pr0n::QscaleProxy->new;
+ } else {
+ $magick = Image::Magick->new;
+ }
+ my $err;
+
+ # ImageMagick can handle NEF files, but it does it by calling dcraw as a delegate.
+ # The delegate support is rather broken and causes very odd stuff to happen when
+ # more than one thread does this at the same time. Thus, we simply do it ourselves.
+ if ($filename =~ /\.(nef|cr2)$/i) {
+ # this would suffice if ImageMagick gets to fix their handling
+ # $physical_fname = "NEF:$physical_fname";
+
+ open DCRAW, "-|", "dcraw", "-w", "-c", $physical_fname
+ or error("dcraw: $!");
+ $err = $magick->Read(file => \*DCRAW);
+ close(DCRAW);
+ } else {
+ # We always want YCbCr JPEGs. Setting this explicitly here instead of using
+ # RGB is slightly faster (no colorspace conversion needed) and works equally
+ # well for our uses, as long as we don't need to draw an information box,
+ # which trickles several ImageMagick bugs related to colorspace handling.
+ # (Ideally we'd be able to keep the image subsampled and
+ # planar, but that would probably be difficult for ImageMagick to expose.)
+ #if (!$infobox) {
+ # $magick->Set(colorspace=>'YCbCr');
+ #}
+ $err = $magick->Read($physical_fname);
+ }
+
+ if ($err) {
+ log_warn($r, "$physical_fname: $err");
+ $err =~ /(\d+)/;
+ if ($1 >= 400) {
+ undef $magick;
+ error($r, "$physical_fname: $err");
+ }
+ }
+
+ # If we use ->[0] unconditionally, text rendering (!) seems to crash
+ my $img;
+ if (ref($magick) !~ /Image::Magick/) {
+ $img = $magick;
+ } else {
+ $img = (scalar @$magick > 1) ? $magick->[0] : $magick;
+ }
+
+ return $img;
+}
+