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#!perl -w
use strict;
use Test::More tests => 232;
BEGIN { use_ok(Imager=>':all') }
use Imager::Test qw(is_image is_color4 is_image_similar);
-d "testout" or mkdir "testout";
Imager::init('log'=>'testout/t40scale.log');
my $img=Imager->new();
ok($img->open(file=>'testimg/scale.ppm',type=>'pnm'),
"load test image") or print "# ",$img->errstr,"\n";
my $scaleimg=$img->scale(scalefactor=>0.25)
or print "# ",$img->errstr,"\n";
ok($scaleimg, "scale it (good mode)");
ok($scaleimg->write(file=>'testout/t40scale1.ppm',type=>'pnm'),
"save scaled image") or print "# ",$img->errstr,"\n";
$scaleimg=$img->scale(scalefactor=>0.25,qtype=>'preview');
ok($scaleimg, "scale it (preview)") or print "# ",$img->errstr,"\n";
ok($scaleimg->write(file=>'testout/t40scale2.ppm',type=>'pnm'),
"write preview scaled image") or print "# ",$img->errstr,"\n";
$scaleimg = $img->scale(scalefactor => 0.25, qtype => 'mixing');
ok($scaleimg, "scale it (mixing)") or print "# ", $img->errstr, "\n";
ok($scaleimg->write(file=>'testout/t40scale3.ppm', type=>'pnm'),
"write mixing scaled image") or print "# ", $img->errstr, "\n";
{ # double image scaling with mixing, since it has code to handle it
my $dimg = Imager->new(xsize => $img->getwidth, ysize => $img->getheight,
channels => $img->getchannels,
bits => 'double');
ok($dimg, "create double/sample image");
$dimg->paste(src => $img);
$scaleimg = $dimg->scale(scalefactor => 0.25, qtype => 'mixing');
ok($scaleimg, "scale it (mixing, double)");
ok($scaleimg->write(file => 'testout/t40mixdbl.ppm', type => 'pnm'),
"write double/mixing scaled image");
is($scaleimg->bits, 'double', "got the right image type as output");
# hscale only, mixing
$scaleimg = $dimg->scale(xscalefactor => 0.33, yscalefactor => 1.0,
qtype => 'mixing');
ok($scaleimg, "scale it (hscale, mixing, double)");
is($scaleimg->getheight, $dimg->getheight, "same height");
ok($scaleimg->write(file => 'testout/t40hscdmix.ppm', type => 'pnm'),
"save it");
# vscale only, mixing
$scaleimg = $dimg->scale(xscalefactor => 1.0, yscalefactor => 0.33,
qtype => 'mixing');
ok($scaleimg, "scale it (vscale, mixing, double)");
is($scaleimg->getwidth, $dimg->getwidth, "same width");
ok($scaleimg->write(file => 'testout/t40vscdmix.ppm', type => 'pnm'),
"save it");
}
{
# check for a warning when scale() is called in void context
my $warning;
local $SIG{__WARN__} =
sub {
$warning = "@_";
my $printed = $warning;
$printed =~ s/\n$//;
$printed =~ s/\n/\n\#/g;
print "# ",$printed, "\n";
};
$img->scale(scalefactor=>0.25);
cmp_ok($warning, '=~', qr/void/, "check warning");
cmp_ok($warning, '=~', qr/t40scale\.t/, "check filename");
$warning = '';
$img->scaleX(scalefactor=>0.25);
cmp_ok($warning, '=~', qr/void/, "check warning");
cmp_ok($warning, '=~', qr/t40scale\.t/, "check filename");
$warning = '';
$img->scaleY(scalefactor=>0.25);
cmp_ok($warning, '=~', qr/void/, "check warning");
cmp_ok($warning, '=~', qr/t40scale\.t/, "check filename");
}
{ # https://rt.cpan.org/Ticket/Display.html?id=7467
# segfault in Imager 0.43
# make sure scale() doesn't let us make an image zero pixels high or wide
# it does this by making the given axis as least 1 pixel high
my $out = $img->scale(scalefactor=>0.00001);
is($out->getwidth, 1, "min scale width");
is($out->getheight, 1, "min scale height");
$out = $img->scale(scalefactor=>0.00001, qtype => 'preview');
is($out->getwidth, 1, "min scale width (preview)");
is($out->getheight, 1, "min scale height (preview)");
$out = $img->scale(scalefactor=>0.00001, qtype => 'mixing');
is($out->getwidth, 1, "min scale width (mixing)");
is($out->getheight, 1, "min scale height (mixing)");
}
{ # error handling - NULL image
my $im = Imager->new;
ok(!$im->scale(scalefactor => 0.5), "try to scale empty image");
is($im->errstr, "empty input image", "check error message");
# scaleX/scaleY
ok(!$im->scaleX(scalefactor => 0.5), "try to scaleX empty image");
is($im->errstr, "empty input image", "check error message");
ok(!$im->scaleY(scalefactor => 0.5), "try to scaleY empty image");
is($im->errstr, "empty input image", "check error message");
}
{ # invalid qtype value
my $im = Imager->new(xsize => 100, ysize => 100);
ok(!$im->scale(scalefactor => 0.5, qtype=>'unknown'), "unknown qtype");
is($im->errstr, "invalid value for qtype parameter", "check error message");
# invalid type value
ok(!$im->scale(xpixels => 10, ypixels=>50, type=>"unknown"), "unknown type");
is($im->errstr, "invalid value for type parameter", "check error message");
}
SKIP:
{ # Image::Math::Constrain support
eval "require Image::Math::Constrain;";
$@ and skip "optional module Image::Math::Constrain not installed", 3;
my $constrain = Image::Math::Constrain->new(20, 100);
my $im = Imager->new(xsize => 160, ysize => 96);
my $result = $im->scale(constrain => $constrain);
ok($result, "successful scale with Image::Math::Constrain");
is($result->getwidth, 20, "check result width");
is($result->getheight, 12, "check result height");
}
{ # scale size checks
my $im = Imager->new(xsize => 160, ysize => 96); # some random size
scale_test($im, 'scale', 80, 48, "48 x 48 def type",
xpixels => 48, ypixels => 48);
scale_test($im, 'scale', 80, 48, "48 x 48 max type",
xpixels => 48, ypixels => 48, type => 'max');
scale_test($im, 'scale', 80, 48, "80 x 80 min type",
xpixels => 80, ypixels => 80, type => 'min');
scale_test($im, 'scale', 80, 48, "no scale parameters (default to 0.5 scalefactor)");
scale_test($im, 'scale', 120, 72, "0.75 scalefactor",
scalefactor => 0.75);
scale_test($im, 'scale', 80, 48, "80 width",
xpixels => 80);
scale_test($im, 'scale', 120, 72, "72 height",
ypixels => 72);
# new scaling parameters in 0.54
scale_test($im, 'scale', 80, 48, "xscale 0.5",
xscalefactor => 0.5);
scale_test($im, 'scale', 80, 48, "yscale 0.5",
yscalefactor => 0.5);
scale_test($im, 'scale', 40, 48, "xscale 0.25 yscale 0.5",
xscalefactor => 0.25, yscalefactor => 0.5);
scale_test($im, 'scale', 160, 48, "xscale 1.0 yscale 0.5",
xscalefactor => 1.0, yscalefactor => 0.5);
scale_test($im, 'scale', 160, 48, "xpixels 160 ypixels 48 type nonprop",
xpixels => 160, ypixels => 48, type => 'nonprop');
scale_test($im, 'scale', 160, 96, "xpixels 160 ypixels 96",
xpixels => 160, ypixels => 96);
scale_test($im, 'scale', 80, 96, "xpixels 80 ypixels 96 type nonprop",
xpixels => 80, ypixels => 96, type => 'nonprop');
# scaleX
scale_test($im, 'scaleX', 80, 96, "defaults");
scale_test($im, 'scaleX', 40, 96, "0.25 scalefactor",
scalefactor => 0.25);
scale_test($im, 'scaleX', 120, 96, "pixels 120",
pixels => 120);
# scaleY
scale_test($im, 'scaleY', 160, 48, "defaults");
scale_test($im, 'scaleY', 160, 192, "2.0 scalefactor",
scalefactor => 2.0);
scale_test($im, 'scaleY', 160, 144, "pixels 144",
pixels => 144);
}
{ # check proper alpha handling for mixing
my $im = Imager->new(xsize => 40, ysize => 40, channels => 4);
$im->box(filled => 1, color => 'C0C0C0');
my $rot = $im->rotate(degrees => -4)
or die;
$rot = $rot->to_rgb16;
my $sc = $rot->scale(qtype => 'mixing', xpixels => 40);
my $out = Imager->new(xsize => $sc->getwidth, ysize => $sc->getheight);
$out->box(filled => 1, color => 'C0C0C0');
my $cmp = $out->copy;
$out->rubthrough(src => $sc);
is_image($out, $cmp, "check we get the right image after scaling (mixing)");
# we now set alpha=0 pixels to zero on scaling
is_color4($sc->getpixel('x' => 39, 'y' => 39), 0, 0, 0, 0,
"check we set alpha=0 pixels to zero on scaling");
}
{ # check proper alpha handling for default scaling
my $im = Imager->new(xsize => 40, ysize => 40, channels => 4);
$im->box(filled => 1, color => 'C0C0C0');
my $rot = $im->rotate(degrees => -4)
or die;
my $sc = $rot->scale(qtype => "normal", xpixels => 40);
my $out = Imager->new(xsize => $sc->getwidth, ysize => $sc->getheight);
$out->box(filled => 1, color => 'C0C0C0');
my $cmp = $out->copy;
$out->rubthrough(src => $sc);
is_image_similar($out, $cmp, 100, "check we get the right image after scaling (normal)");
# we now set alpha=0 pixels to zero on scaling
is_color4($sc->getpixel('x' => 39, 'y' => 39), 0, 0, 0, 0,
"check we set alpha=0 pixels to zero on scaling");
}
{ # scale_calculate
my $im = Imager->new(xsize => 100, ysize => 120);
is_deeply([ $im->scale_calculate(scalefactor => 0.5) ],
[ 0.5, 0.5, 50, 60 ],
"simple scale_calculate");
is_deeply([ Imager->scale_calculate(scalefactor => 0.5) ],
[], "failed scale_calculate");
is_deeply([ Imager->scale_calculate(width => 120, height => 150,
xpixels => 240) ],
[ 2.0, 2.0, 240, 300 ],
"class method scale_factor");
}
{ # passing a reference for scaling parameters should fail
# RT #35172
my $im = Imager->new(xsize => 100, ysize => 100);
ok(!$im->scale(xpixels => {}), "can't use a reference as a size");
cmp_ok($im->errstr, '=~', "xpixels parameter cannot be a reference",
"check error message");
}
sub scale_test {
my ($in, $method, $exp_width, $exp_height, $note, @parms) = @_;
print "# $note: @parms\n";
for my $qtype (qw(normal preview mixing)) {
SKIP:
{
my $scaled = $in->$method(@parms, qtype => $qtype);
ok($scaled, "$method $note qtype $qtype")
or skip("failed to scale", 2);
is($scaled->getwidth, $exp_width, "check width");
is($scaled->getheight, $exp_height, "check height");
}
}
}
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