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package Selenium::Screenshot; |
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$Selenium::Screenshot::VERSION = '0.06'; |
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# ABSTRACT: Compare and contrast Webdriver screenshots in PNG format |
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1311
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use Moo; |
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11445
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1
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use Image::Compare; |
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51775
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1
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64
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use Imager qw/:handy/; |
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use Imager::Color; |
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1
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use Imager::Fountain; |
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use Carp qw/croak carp confess/; |
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use Cwd qw/abs_path/; |
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44
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1
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use MIME::Base64; |
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1
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use Scalar::Util qw/blessed/; |
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1575
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has png => ( |
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is => 'rwp', |
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lazy => 1, |
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coerce => sub { |
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my ($png_or_image) = @_; |
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# We are prepared to handle an Imager object, or a base64 |
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# encoded png. |
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if ( blessed( $png_or_image ) && $png_or_image->isa('Imager')) { |
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return $png_or_image; |
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} |
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else { |
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my $data = decode_base64($png_or_image); |
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my $image = Imager->new(data => $data); |
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if (! $image && Imager->errstr) { |
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confess "you must provide a base64 encoded png. We were not able to create an Imager object after base64 decoding your input; Imager's error message was:\n\n" . Imager->errstr; |
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} |
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else { |
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return $image; |
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} |
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} |
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}, |
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required => 1 |
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); |
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42
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has exclude => ( |
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is => 'ro', |
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lazy => 1, |
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default => sub { [ ] }, |
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coerce => sub { |
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my ($exclude) = @_; |
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49
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foreach my $rect (@{ $exclude }) { |
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croak 'Each exclude region must have size and location keys.' |
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unless exists $rect->{size} && exists $rect->{location}; |
52
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} |
53
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54
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return $exclude; |
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}, |
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predicate => 1 |
57
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); |
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59
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60
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has target => ( |
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is => 'ro', |
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lazy => 1, |
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default => sub { {} }, |
64
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coerce => sub { |
65
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my ($rect) = @_; |
66
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67
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croak 'Each exclude region must have size and location keys.' |
68
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unless exists $rect->{size} && exists $rect->{location}; |
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70
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return $rect; |
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}, |
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predicate => 1 |
73
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); |
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75
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76
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# TODO: add threshold tests |
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# TODO: provide reference images |
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79
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has threshold => ( |
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is => 'ro', |
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lazy => 1, |
82
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coerce => sub { |
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my ($threshold) = @_; |
84
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85
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my $scaling = 255 * sqrt(3) / 100; |
86
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return $threshold * $scaling; |
87
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}, |
88
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default => sub { 5 } |
89
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); |
90
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91
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92
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has folder => ( |
93
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is => 'rw', |
94
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coerce => sub { |
95
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my ($folder) = @_; |
96
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$folder //= 'screenshots/'; |
97
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mkdir $folder unless -d $folder; |
98
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99
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return abs_path($folder) . '/'; |
100
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}, |
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default => sub { 'screenshots/' } |
102
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); |
103
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104
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105
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has metadata => ( |
106
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is => 'ro', |
107
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lazy => 1, |
108
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default => sub { {} }, |
109
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predicate => 'has_metadata' |
110
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); |
111
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112
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has _cmp => ( |
113
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is => 'ro', |
114
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lazy => 1, |
115
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init_arg => undef, |
116
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builder => sub { |
117
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0
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0
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0
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my ($self) = @_; |
118
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0
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0
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my $cmp = Image::Compare->new; |
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120
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0
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0
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0
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if ($self->has_target) { |
121
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0
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0
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my $png = $self->_img_target($self->png); |
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0
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0
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$self->_set_png($png); |
123
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} |
124
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125
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0
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0
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0
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if ($self->has_exclude) { |
126
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0
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0
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my $png = $self->_img_exclude($self->png); |
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0
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$self->_set_png($png); |
128
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} |
129
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130
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$cmp->set_image1( |
131
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0
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img => $self->png, |
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type => 'png' |
133
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); |
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135
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0
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0
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return $cmp; |
136
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} |
137
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); |
138
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139
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with 'Selenium::Screenshot::CanPad'; |
140
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141
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142
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sub compare { |
143
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0
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0
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1
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0
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my ($self, $opponent) = @_; |
144
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0
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0
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$opponent = $self->_set_opponent($opponent); |
145
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146
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0
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0
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0
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if (not defined $opponent) { |
147
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0
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0
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carp 'No reference was provided or found, so no comparison was done. We\'ve saved a reference at ' . $self->reference; |
148
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0
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0
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return $self->save_reference; |
149
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} |
150
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else { |
151
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0
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0
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$self->_cmp->set_method( |
152
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method => &Image::Compare::AVG_THRESHOLD, |
153
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args => { |
154
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type => &Image::Compare::AVG_THRESHOLD::MEAN, |
155
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value => $self->threshold, |
156
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} |
157
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); |
158
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159
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0
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0
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return $self->_cmp->compare; |
160
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} |
161
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} |
162
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163
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164
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sub difference { |
165
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0
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0
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1
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0
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my ($self, $opponent) = @_; |
166
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0
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0
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$opponent = $self->_set_opponent($opponent); |
167
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168
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# We want to range from transparent (no difference) to fuschia at |
169
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# 100% change. |
170
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0
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0
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my $white = Imager::Color->new(255, 255, 255); |
171
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0
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0
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my $fuschia = Imager::Color->new(240, 18, 190); |
172
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0
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0
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my $scale = Imager::Fountain->simple( |
173
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positions => [ 0.0, 1.0 ], |
174
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colors => [ $white, $fuschia ] |
175
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); |
176
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177
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0
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0
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$self->_cmp->set_method( |
178
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method => &Image::Compare::IMAGE, |
179
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args => $scale |
180
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); |
181
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182
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# Do the actual pixel by pixel comparison. This can take a while. |
183
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0
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0
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my $diff = $self->_cmp->compare; |
184
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185
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# Post processing to overlay the difference onto the |
186
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# opponent. First, subtract a white box from our difference image; |
187
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# to make everything white transparent instead. |
188
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0
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0
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my $work = Imager->new( |
189
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xsize => $diff->getwidth, |
190
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ysize => $diff->getheight, |
191
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channels => $diff->getchannels |
192
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); |
193
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0
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0
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$work->box(filled => 1, color => $white ); |
194
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0
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0
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$diff = $work->difference(other => $diff); |
195
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196
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# Place the transparent diff image on top of our opponent - |
197
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# anything changed will show up on top of the opponent image in |
198
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# varying degrees of pink. |
199
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0
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0
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$opponent->compose(src => $diff); |
200
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201
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0
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0
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my $name = $self->_diff_filename; |
202
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0
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0
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$opponent->write(file => $name); |
203
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204
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0
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0
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return $name; |
205
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} |
206
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207
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208
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sub find_opponent { |
209
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0
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0
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1
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0
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my ($self) = @_; |
210
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211
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0
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0
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my $default_reference = $self->reference; |
212
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0
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0
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0
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if (-e $default_reference) { |
213
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0
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0
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return Imager->new(file => $default_reference); |
214
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} |
215
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} |
216
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217
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sub _diff_filename { |
218
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0
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0
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0
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my ($self) = @_; |
219
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220
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0
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0
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my $diff = $self->filename; |
221
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0
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0
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$diff =~ s/\.png$/-diff.png/; |
222
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223
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0
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0
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return $diff; |
224
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} |
225
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226
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sub _set_opponent { |
227
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0
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0
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0
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my ($self, $opponent) = @_; |
228
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0
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0
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0
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$opponent //= $self->find_opponent; |
229
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230
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# No opponent was provided, and we can't find one. |
231
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0
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0
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0
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return unless $opponent; |
232
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233
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0
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0
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$opponent = $self->_extract_image( $opponent ); |
234
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235
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# Before setting this $opponent as our image2, we must ensure that |
236
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# our $self->png image and this $opponent are the same size. |
237
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0
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0
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0
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if (! $self->cmp_image_dims( $self->png, $opponent )) { |
238
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0
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0
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my ($new_png, $new_opp) = $self->coerce_image_size( $self->png, $opponent ); |
239
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0
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0
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$self->_set_png( $new_png ); |
240
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0
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0
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$opponent = $new_opp; |
241
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} |
242
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243
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0
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0
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0
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$opponent = $self->_img_target( $opponent ) if $self->has_target; |
244
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0
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0
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0
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$opponent = $self->_img_exclude( $opponent ) if $self->has_exclude; |
245
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246
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0
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0
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$self->_cmp->set_image2( img => $opponent ); |
247
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248
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0
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0
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return $opponent; |
249
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} |
250
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251
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252
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sub filename { |
253
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3
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3
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1
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36
|
my ($self, %overrides) = @_; |
254
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255
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3
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4
|
my @filename_parts; |
256
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3
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100
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66
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16
|
if ($self->has_metadata or %overrides) { |
257
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my $metadata = { |
258
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2
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3
|
%{ $self->metadata}, |
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2
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21
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259
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%overrides |
260
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}; |
261
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262
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2
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402
|
foreach (sort keys %{ $metadata }) { |
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2
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7
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263
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2
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6
|
push @filename_parts, $self->_sanitize_string($metadata->{$_}); |
264
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} |
265
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} |
266
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|
else { |
267
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1
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21
|
push @filename_parts, time |
268
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|
} |
269
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270
|
3
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38
|
my $filename = $self->folder . join('-', @filename_parts) . '.png'; |
271
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3
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478
|
$filename =~ s/\-+/-/g; |
272
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3
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10
|
return $filename; |
273
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|
} |
274
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275
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276
|
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|
sub reference { |
277
|
0
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|
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0
|
1
|
0
|
my ($self) = @_; |
278
|
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279
|
0
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|
|
0
|
my $default_reference = $self->filename; |
280
|
0
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|
0
|
$default_reference =~ s/\.png$/-reference.png/; |
281
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282
|
0
|
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|
|
0
|
return $default_reference; |
283
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|
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|
|
} |
284
|
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|
285
|
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|
286
|
|
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|
|
sub save { |
287
|
0
|
|
|
0
|
1
|
0
|
my ($self, %overrides) = @_; |
288
|
|
|
|
|
|
|
|
289
|
0
|
|
|
|
|
0
|
my $png = $self->png; |
290
|
0
|
|
|
|
|
0
|
my $filename = $self->filename(%overrides); |
291
|
0
|
|
|
|
|
0
|
$png->write(file => $filename); |
292
|
|
|
|
|
|
|
|
293
|
0
|
|
|
|
|
0
|
return $filename; |
294
|
|
|
|
|
|
|
} |
295
|
|
|
|
|
|
|
|
296
|
|
|
|
|
|
|
|
297
|
|
|
|
|
|
|
sub save_reference { |
298
|
0
|
|
|
0
|
1
|
0
|
my ($self) = @_; |
299
|
|
|
|
|
|
|
|
300
|
0
|
|
|
|
|
0
|
my $png = $self->png; |
301
|
0
|
|
|
|
|
0
|
$png->write(file => $self->reference); |
302
|
|
|
|
|
|
|
|
303
|
0
|
|
|
|
|
0
|
return $self->reference; |
304
|
|
|
|
|
|
|
} |
305
|
|
|
|
|
|
|
|
306
|
|
|
|
|
|
|
sub _img_exclude { |
307
|
0
|
|
|
0
|
|
0
|
my ($self, $img, $exclude) = @_; |
308
|
0
|
|
0
|
|
|
0
|
$exclude //= $self->exclude; |
309
|
|
|
|
|
|
|
|
310
|
0
|
|
|
|
|
0
|
my $copy = $img->copy; |
311
|
|
|
|
|
|
|
|
312
|
0
|
|
|
|
|
0
|
foreach my $rect (@{ $exclude }) { |
|
0
|
|
|
|
|
0
|
|
313
|
0
|
|
|
|
|
0
|
my ($size, $loc) = ($rect->{size}, $rect->{location}); |
314
|
|
|
|
|
|
|
|
315
|
|
|
|
|
|
|
# skip items that don't have the valid keys |
316
|
0
|
0
|
0
|
|
|
0
|
unless (exists $loc->{x} |
|
|
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
317
|
|
|
|
|
|
|
&& exists $loc->{y} |
318
|
|
|
|
|
|
|
&& exists $size->{width} |
319
|
|
|
|
|
|
|
&& exists $size->{height}) { |
320
|
0
|
|
|
|
|
0
|
next; |
321
|
|
|
|
|
|
|
} |
322
|
|
|
|
|
|
|
|
323
|
|
|
|
|
|
|
my $top_left = { |
324
|
|
|
|
|
|
|
x => $loc->{x}, |
325
|
|
|
|
|
|
|
y => $loc->{y} |
326
|
0
|
|
|
|
|
0
|
}; |
327
|
|
|
|
|
|
|
|
328
|
|
|
|
|
|
|
my $bottom_right = { |
329
|
|
|
|
|
|
|
x => $loc->{x} + $size->{width}, |
330
|
|
|
|
|
|
|
y => $loc->{y} + $size->{height} |
331
|
0
|
|
|
|
|
0
|
}; |
332
|
|
|
|
|
|
|
|
333
|
|
|
|
|
|
|
$copy->box( |
334
|
|
|
|
|
|
|
xmin => $top_left->{x}, |
335
|
|
|
|
|
|
|
ymin => $top_left->{y}, |
336
|
|
|
|
|
|
|
xmax => $bottom_right->{x}, |
337
|
|
|
|
|
|
|
ymax => $bottom_right->{y}, |
338
|
0
|
|
|
|
|
0
|
filled => 1, |
339
|
|
|
|
|
|
|
color => 'black' |
340
|
|
|
|
|
|
|
); |
341
|
|
|
|
|
|
|
} |
342
|
|
|
|
|
|
|
|
343
|
0
|
|
|
|
|
0
|
return $copy; |
344
|
|
|
|
|
|
|
} |
345
|
|
|
|
|
|
|
|
346
|
|
|
|
|
|
|
sub _img_target { |
347
|
0
|
|
|
0
|
|
0
|
my ($self, $img, $target) = @_; |
348
|
0
|
|
0
|
|
|
0
|
$target //= $self->target; |
349
|
|
|
|
|
|
|
|
350
|
0
|
|
|
|
|
0
|
my ($size, $loc) = ($target->{size}, $target->{location}); |
351
|
|
|
|
|
|
|
|
352
|
0
|
0
|
0
|
|
|
0
|
unless (exists $loc->{x} |
|
|
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
353
|
|
|
|
|
|
|
&& exists $loc->{y} |
354
|
|
|
|
|
|
|
&& exists $size->{width} |
355
|
|
|
|
|
|
|
&& exists $size->{height}) { |
356
|
0
|
|
|
|
|
0
|
next; |
357
|
|
|
|
|
|
|
} |
358
|
|
|
|
|
|
|
|
359
|
0
|
|
|
|
|
0
|
my $left = $loc->{x}; |
360
|
0
|
|
|
|
|
0
|
my $top = $loc->{y}; |
361
|
0
|
|
|
|
|
0
|
my $right = $left + $size->{width}; |
362
|
0
|
|
|
|
|
0
|
my $bottom = $top + $size->{height}; |
363
|
|
|
|
|
|
|
|
364
|
|
|
|
|
|
|
# copy returns the cropped image, unlike box |
365
|
0
|
|
|
|
|
0
|
return $img->crop( |
366
|
|
|
|
|
|
|
left => $left, |
367
|
|
|
|
|
|
|
top => $top, |
368
|
|
|
|
|
|
|
right => $right, |
369
|
|
|
|
|
|
|
bottom => $bottom |
370
|
|
|
|
|
|
|
); |
371
|
|
|
|
|
|
|
} |
372
|
|
|
|
|
|
|
|
373
|
|
|
|
|
|
|
sub _sanitize_string { |
374
|
2
|
|
|
2
|
|
3
|
my ($self, $dirty_string) = @_; |
375
|
|
|
|
|
|
|
|
376
|
2
|
|
|
|
|
5
|
$dirty_string =~ s/[^A-z0-9\.\-]/-/g; |
377
|
2
|
|
|
|
|
5
|
return $dirty_string; |
378
|
|
|
|
|
|
|
} |
379
|
|
|
|
|
|
|
|
380
|
|
|
|
|
|
|
sub _extract_image { |
381
|
0
|
|
|
0
|
|
|
my ($self, $file_or_image) = @_; |
382
|
|
|
|
|
|
|
|
383
|
0
|
|
|
|
|
|
my $err_msg = 'We were expecting one of: a filename, Imager object, or Selenium::Screenshot object'; |
384
|
0
|
0
|
|
|
|
|
croak $err_msg unless defined $file_or_image; |
385
|
|
|
|
|
|
|
|
386
|
0
|
0
|
|
|
|
|
if ( blessed( $file_or_image ) ) { |
387
|
0
|
0
|
|
|
|
|
if ($file_or_image->isa('Selenium::Screenshot')) { |
|
|
0
|
|
|
|
|
|
388
|
0
|
|
|
|
|
|
return $file_or_image->png; |
389
|
|
|
|
|
|
|
} |
390
|
|
|
|
|
|
|
elsif ($file_or_image->isa('Imager')) { |
391
|
0
|
|
|
|
|
|
return $file_or_image; |
392
|
|
|
|
|
|
|
} |
393
|
|
|
|
|
|
|
else { |
394
|
0
|
|
|
|
|
|
croak $err_msg; |
395
|
|
|
|
|
|
|
} |
396
|
|
|
|
|
|
|
} |
397
|
|
|
|
|
|
|
else { |
398
|
0
|
|
|
|
|
|
return Imager->new(file => $file_or_image); |
399
|
|
|
|
|
|
|
} |
400
|
|
|
|
|
|
|
} |
401
|
|
|
|
|
|
|
|
402
|
|
|
|
|
|
|
|
403
|
|
|
|
|
|
|
1; |
404
|
|
|
|
|
|
|
|
405
|
|
|
|
|
|
|
__END__ |