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package ICC::Profile::curf; |
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use strict; |
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use Carp; |
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our $VERSION = 0.12; |
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# revised 2018-08-07 |
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# |
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# Copyright © 2004-2020 by William B. Birkett |
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# inherit from Shared |
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use parent qw(ICC::Shared); |
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# create new curf tag object |
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# hash may contain pointers to segments or breakpoints |
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# segments are an array of 'parf' or 'samf' objects |
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# hash keys are: ('segment', 'breakpoint') |
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# parameters: ([ref_to_attribute_hash]) |
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# returns: (ref_to_object) |
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sub new { |
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# get object class |
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my $class = shift(); |
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# create empty curf object |
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my $self = [ |
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{}, # object header |
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[], # segment object array |
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[] # breakpoint array |
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]; |
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# if there are parameters |
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if (@_) { |
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# if one parameter, a hash reference |
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if (@_ == 1 && ref($_[0]) eq 'HASH') { |
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# make new curf object from attribute hash |
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_new_from_hash($self, shift()); |
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} else { |
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# error |
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croak('\'curf\' parameter must be a hash reference'); |
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} |
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} |
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# bless object |
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bless($self, $class); |
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54
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# return object reference |
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return($self); |
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} |
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# create curf tag object from ICC profile |
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# parameters: (ref_to_parent_object, file_handle, ref_to_tag_table_entry) |
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# returns: (ref_to_object) |
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sub new_fh { |
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# get object class |
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my $class = shift(); |
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# create empty curf object |
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my $self = [ |
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{}, # object header |
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[], # segment object array |
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[] # breakpoint array |
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]; |
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# verify 3 parameters |
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(@_ == 3) or croak('wrong number of parameters'); |
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77
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# read curf data from profile |
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_readICCcurf($self, @_); |
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80
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# bless object |
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bless($self, $class); |
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# return object reference |
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return($self); |
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86
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} |
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# writes curf tag object to ICC profile |
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# parameters: (ref_to_parent_object, file_handle, ref_to_tag_table_entry) |
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sub write_fh { |
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# verify 4 parameters |
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(@_ == 4) or croak('wrong number of parameters'); |
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# write curf data to profile |
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goto &_writeICCcurf; |
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} |
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100
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# get tag size (for writing to profile) |
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# returns: (tag_size) |
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sub size { |
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104
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# get parameters |
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my ($self) = @_; |
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107
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# set size of header and breakpoints |
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my $size = 12 + 4 * @{$self->[2]}; |
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109
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110
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# for each curve segment |
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for my $seg (@{$self->[1]}) { |
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112
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113
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# add size |
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$size += $seg->size(); |
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116
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} |
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118
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# return size |
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return($size); |
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121
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} |
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123
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# compute curve derivative function |
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# parameters: (input_value) |
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# returns: (output_value) |
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sub derivative { |
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128
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# get parameters |
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my ($self, $in) = @_; |
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131
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# local variables |
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my ($ix); |
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134
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# return transformed value, if just one segment |
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return($self->[1][0]->derivative($in)) if ($#{$self->[1]} == 0); |
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136
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137
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# initialize index |
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$ix = 0; |
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140
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# for each breakpoint |
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for my $bp (@{$self->[2]}) { |
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142
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143
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# last if breakpoint >= input value |
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last if ($bp >= $in); |
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146
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# increment index |
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$ix++; |
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149
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} |
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151
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# if segment is a 'parf' object |
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if (UNIVERSAL::isa($self->[1][$ix], 'ICC::Profile::parf')) { |
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153
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154
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# return transformed value |
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0
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return($self->[1][$ix]->derivative($in)); |
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157
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# if segment is a 'samf' object |
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} elsif (UNIVERSAL::isa($self->[1][$ix], 'ICC::Profile::samf')) { |
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160
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# return transformed value |
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return($self->[1][$ix]->derivative($in, $self->[2][$ix - 1], $self->[2][$ix], $self->[1][$ix - 1])); |
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163
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} else { |
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165
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# error |
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croak('unsupported object class for \'curf\' segment'); |
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168
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} |
169
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170
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} |
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172
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# compute curve function |
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# parameters: (input_value) |
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# returns: (output_value) |
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sub transform { |
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177
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# get parameters |
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my ($self, $in) = @_; |
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180
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# local variables |
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my ($ix); |
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183
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# return transformed value, if just one segment |
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return($self->[1][0]->transform($in)) if ($#{$self->[1]} == 0); |
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185
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186
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# initialize index |
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$ix = 0; |
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189
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# for each breakpoint |
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for my $bp (@{$self->[2]}) { |
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191
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192
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# last if breakpoint >= input value |
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last if ($bp >= $in); |
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195
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# increment index |
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$ix++; |
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198
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} |
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200
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# if segment is a 'parf' object |
201
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if (UNIVERSAL::isa($self->[1][$ix], 'ICC::Profile::parf')) { |
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0
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202
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203
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# return transformed value |
204
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return($self->[1][$ix]->transform($in)); |
205
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206
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# if segment is a 'samf' object |
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} elsif (UNIVERSAL::isa($self->[1][$ix], 'ICC::Profile::samf')) { |
208
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209
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# return transformed value |
210
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return($self->[1][$ix]->transform($in, $self->[2][$ix - 1], $self->[2][$ix], $self->[1][$ix - 1])); |
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212
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} else { |
213
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214
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# error |
215
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0
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croak('unsupported object class for \'curf\' segment'); |
216
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217
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} |
218
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219
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} |
220
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221
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# get/set segment array reference |
222
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# parameters: ([ref_to_array]) |
223
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# returns: (ref_to_array) |
224
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sub segment { |
225
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226
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# get object reference |
227
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0
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0
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0
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my $self = shift(); |
228
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229
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# if parameter |
230
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0
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0
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if (@_) { |
231
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232
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# verify array reference |
233
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0
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0
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(ref($_[0]) eq 'ARRAY') or croak('not an array reference'); |
234
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235
|
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|
# set array reference |
236
|
0
|
|
|
|
|
|
$self->[1] = [@{shift()}]; |
|
0
|
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|
|
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|
|
237
|
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|
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|
238
|
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|
} |
239
|
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|
|
240
|
|
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|
|
|
|
# return array reference |
241
|
0
|
|
|
|
|
|
return($self->[1]); |
242
|
|
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|
|
|
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|
243
|
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|
|
} |
244
|
|
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|
245
|
|
|
|
|
|
|
# get/set breakpoint array reference |
246
|
|
|
|
|
|
|
# parameters: ([ref_to_array]) |
247
|
|
|
|
|
|
|
# returns: (ref_to_array) |
248
|
|
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|
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|
|
sub breakpoint { |
249
|
|
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|
|
|
|
|
250
|
|
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|
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|
|
# get object reference |
251
|
0
|
|
|
0
|
0
|
|
my $self = shift(); |
252
|
|
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|
|
|
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|
253
|
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|
|
# if parameter |
254
|
0
|
0
|
|
|
|
|
if (@_) { |
255
|
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|
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|
|
|
256
|
|
|
|
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|
|
# verify array reference |
257
|
0
|
0
|
|
|
|
|
(ref($_[0]) eq 'ARRAY') or croak('not an array reference'); |
258
|
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|
|
259
|
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|
# set array reference |
260
|
0
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|
|
|
|
$self->[2] = [@{shift()}]; |
|
0
|
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|
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|
261
|
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|
|
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|
262
|
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|
} |
263
|
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|
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|
|
264
|
|
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|
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|
# return array reference |
265
|
0
|
|
|
|
|
|
return($self->[2]); |
266
|
|
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|
|
|
|
|
267
|
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|
|
} |
268
|
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|
269
|
|
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|
# print object contents to string |
270
|
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|
|
# format is an array structure |
271
|
|
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|
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|
|
# parameter: ([format]) |
272
|
|
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|
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|
|
# returns: (string) |
273
|
|
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|
|
|
|
sub sdump { |
274
|
|
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|
|
|
|
|
275
|
|
|
|
|
|
|
# get parameters |
276
|
0
|
|
|
0
|
1
|
|
my ($self, $p) = @_; |
277
|
|
|
|
|
|
|
|
278
|
|
|
|
|
|
|
# local variables |
279
|
0
|
|
|
|
|
|
my ($s, $fmt); |
280
|
|
|
|
|
|
|
|
281
|
|
|
|
|
|
|
# resolve parameter to an array reference |
282
|
0
|
0
|
|
|
|
|
$p = defined($p) ? ref($p) eq 'ARRAY' ? $p : [$p] : []; |
|
|
0
|
|
|
|
|
|
283
|
|
|
|
|
|
|
|
284
|
|
|
|
|
|
|
# get format string |
285
|
0
|
0
|
0
|
|
|
|
$fmt = defined($p->[0]) && ! ref($p->[0]) ? $p->[0] : 'undef'; |
286
|
|
|
|
|
|
|
|
287
|
|
|
|
|
|
|
# set string to object ID |
288
|
0
|
|
|
|
|
|
$s = sprintf("'%s' object, (0x%x)\n", ref($self), $self); |
289
|
|
|
|
|
|
|
|
290
|
|
|
|
|
|
|
# return |
291
|
0
|
|
|
|
|
|
return($s); |
292
|
|
|
|
|
|
|
|
293
|
|
|
|
|
|
|
} |
294
|
|
|
|
|
|
|
|
295
|
|
|
|
|
|
|
# make new curf object from attribute hash |
296
|
|
|
|
|
|
|
# hash may contain pointers to segments, or breakpoints |
297
|
|
|
|
|
|
|
# hash keys are: ('segment', 'breakpoint') |
298
|
|
|
|
|
|
|
# object elements not specified in the hash are unchanged |
299
|
|
|
|
|
|
|
# parameters: (ref_to_object, ref_to_attribute_hash) |
300
|
|
|
|
|
|
|
sub _new_from_hash { |
301
|
|
|
|
|
|
|
|
302
|
|
|
|
|
|
|
# get parameters |
303
|
0
|
|
|
0
|
|
|
my ($self, $hash) = @_; |
304
|
|
|
|
|
|
|
|
305
|
|
|
|
|
|
|
# for each attribute |
306
|
0
|
|
|
|
|
|
for my $attr (keys(%{$hash})) { |
|
0
|
|
|
|
|
|
|
307
|
|
|
|
|
|
|
|
308
|
|
|
|
|
|
|
# if 'segment' |
309
|
0
|
0
|
|
|
|
|
if ($attr eq 'segment') { |
|
|
0
|
|
|
|
|
|
310
|
|
|
|
|
|
|
|
311
|
|
|
|
|
|
|
# if reference to an array of 'parf' or 'samf' objects |
312
|
0
|
0
|
0
|
|
|
|
if (ref($hash->{$attr}) eq 'ARRAY' && @{$hash->{$attr}} == grep {UNIVERSAL::isa($_, 'ICC::Profile::parf') || UNIVERSAL::isa($_, 'ICC::Profile::samf')} @{$hash->{$attr}}) { |
|
0
|
0
|
|
|
|
|
|
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
|
|
313
|
|
|
|
|
|
|
|
314
|
|
|
|
|
|
|
# set object element |
315
|
0
|
|
|
|
|
|
$self->[1] = [@{$hash->{$attr}}]; |
|
0
|
|
|
|
|
|
|
316
|
|
|
|
|
|
|
|
317
|
|
|
|
|
|
|
} else { |
318
|
|
|
|
|
|
|
|
319
|
|
|
|
|
|
|
# wrong data type |
320
|
0
|
|
|
|
|
|
croak('\'curf\' segment attribute must be a reference to an array of \'parf\' or \'samf\' objects'); |
321
|
|
|
|
|
|
|
|
322
|
|
|
|
|
|
|
} |
323
|
|
|
|
|
|
|
|
324
|
|
|
|
|
|
|
# if 'breakpoint' |
325
|
|
|
|
|
|
|
} elsif ($attr eq 'breakpoint') { |
326
|
|
|
|
|
|
|
|
327
|
|
|
|
|
|
|
# if reference to an array of scalars |
328
|
0
|
0
|
0
|
|
|
|
if (ref($hash->{$attr}) eq 'ARRAY' && @{$hash->{$attr}} == grep {! ref()} @{$hash->{$attr}}) { |
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
|
|
329
|
|
|
|
|
|
|
|
330
|
|
|
|
|
|
|
# set object element |
331
|
0
|
|
|
|
|
|
$self->[2] = [@{$hash->{$attr}}]; |
|
0
|
|
|
|
|
|
|
332
|
|
|
|
|
|
|
|
333
|
|
|
|
|
|
|
} else { |
334
|
|
|
|
|
|
|
|
335
|
|
|
|
|
|
|
# wrong data type |
336
|
0
|
|
|
|
|
|
croak('\'curf\' breakpoint attribute must be a reference to an array of scalars'); |
337
|
|
|
|
|
|
|
|
338
|
|
|
|
|
|
|
} |
339
|
|
|
|
|
|
|
|
340
|
|
|
|
|
|
|
} |
341
|
|
|
|
|
|
|
|
342
|
|
|
|
|
|
|
} |
343
|
|
|
|
|
|
|
|
344
|
|
|
|
|
|
|
} |
345
|
|
|
|
|
|
|
|
346
|
|
|
|
|
|
|
# read curf tag from ICC profile |
347
|
|
|
|
|
|
|
# parameters: (ref_to_object, ref_to_parent_object, file_handle, ref_to_tag_table_entry) |
348
|
|
|
|
|
|
|
sub _readICCcurf { |
349
|
|
|
|
|
|
|
|
350
|
|
|
|
|
|
|
# get parameters |
351
|
0
|
|
|
0
|
|
|
my ($self, $parent, $fh, $tag) = @_; |
352
|
|
|
|
|
|
|
|
353
|
|
|
|
|
|
|
# local variables |
354
|
0
|
|
|
|
|
|
my ($buf, $segs, $mark, $class); |
355
|
|
|
|
|
|
|
|
356
|
|
|
|
|
|
|
# save tag signature |
357
|
0
|
|
|
|
|
|
$self->[0]{'signature'} = $tag->[0]; |
358
|
|
|
|
|
|
|
|
359
|
|
|
|
|
|
|
# seek start of tag |
360
|
0
|
|
|
|
|
|
seek($fh, $tag->[1], 0); |
361
|
|
|
|
|
|
|
|
362
|
|
|
|
|
|
|
# read tag header |
363
|
0
|
|
|
|
|
|
read($fh, $buf, 12); |
364
|
|
|
|
|
|
|
|
365
|
|
|
|
|
|
|
# unpack number of segments |
366
|
0
|
|
|
|
|
|
$segs = unpack('x8 n x2', $buf); |
367
|
|
|
|
|
|
|
|
368
|
|
|
|
|
|
|
# if one segment |
369
|
0
|
0
|
|
|
|
|
if ($segs == 1) { |
|
|
0
|
|
|
|
|
|
370
|
|
|
|
|
|
|
|
371
|
|
|
|
|
|
|
# mark file offset |
372
|
0
|
|
|
|
|
|
$mark = tell($fh); |
373
|
|
|
|
|
|
|
|
374
|
|
|
|
|
|
|
# read segment type signature |
375
|
0
|
|
|
|
|
|
read($fh, $buf, 4); |
376
|
|
|
|
|
|
|
|
377
|
|
|
|
|
|
|
# if type is 'parf' |
378
|
0
|
0
|
|
|
|
|
if ($buf eq 'parf') { |
379
|
|
|
|
|
|
|
|
380
|
|
|
|
|
|
|
# create object |
381
|
0
|
|
|
|
|
|
$self->[1][0] = ICC::Profile::parf->new_fh($self, $fh, ['curf', $mark]); |
382
|
|
|
|
|
|
|
|
383
|
|
|
|
|
|
|
} else { |
384
|
|
|
|
|
|
|
|
385
|
|
|
|
|
|
|
# error |
386
|
0
|
|
|
|
|
|
croak('wrong segment type in \'curf\' tag'); |
387
|
|
|
|
|
|
|
|
388
|
|
|
|
|
|
|
} |
389
|
|
|
|
|
|
|
|
390
|
|
|
|
|
|
|
# if more than one segment |
391
|
|
|
|
|
|
|
} elsif ($segs > 1) { |
392
|
|
|
|
|
|
|
|
393
|
|
|
|
|
|
|
# read breakpoint values |
394
|
0
|
|
|
|
|
|
read($fh, $buf, 4 * ($segs - 1)); |
395
|
|
|
|
|
|
|
|
396
|
|
|
|
|
|
|
# unpack breakpoint values |
397
|
0
|
|
|
|
|
|
$self->[2] = [unpack('f>*', $buf)]; |
398
|
|
|
|
|
|
|
|
399
|
|
|
|
|
|
|
# for each segment |
400
|
0
|
|
|
|
|
|
for my $i (0 .. $segs - 1) { |
401
|
|
|
|
|
|
|
|
402
|
|
|
|
|
|
|
# mark file offset |
403
|
0
|
|
|
|
|
|
$mark = tell($fh); |
404
|
|
|
|
|
|
|
|
405
|
|
|
|
|
|
|
# read segment type signature |
406
|
0
|
|
|
|
|
|
read($fh, $buf, 4); |
407
|
|
|
|
|
|
|
|
408
|
|
|
|
|
|
|
# if type is 'parf' or 'samf' |
409
|
0
|
0
|
0
|
|
|
|
if ($buf eq 'parf' || $buf eq 'samf') { |
410
|
|
|
|
|
|
|
|
411
|
|
|
|
|
|
|
# form class specifier |
412
|
0
|
|
|
|
|
|
$class = "ICC::Profile::$buf"; |
413
|
|
|
|
|
|
|
|
414
|
|
|
|
|
|
|
# create specific tag object |
415
|
0
|
|
|
|
|
|
$self->[1][$i] = $class->new_fh($self, $fh, ['curf', $mark]); |
416
|
|
|
|
|
|
|
|
417
|
|
|
|
|
|
|
} else { |
418
|
|
|
|
|
|
|
|
419
|
|
|
|
|
|
|
# error |
420
|
0
|
|
|
|
|
|
croak('unsupported segment type in \'curf\' tag'); |
421
|
|
|
|
|
|
|
|
422
|
|
|
|
|
|
|
} |
423
|
|
|
|
|
|
|
|
424
|
|
|
|
|
|
|
} |
425
|
|
|
|
|
|
|
|
426
|
|
|
|
|
|
|
} else { |
427
|
|
|
|
|
|
|
|
428
|
|
|
|
|
|
|
# error |
429
|
0
|
|
|
|
|
|
croak('\'curf\' tag has no segments'); |
430
|
|
|
|
|
|
|
|
431
|
|
|
|
|
|
|
} |
432
|
|
|
|
|
|
|
|
433
|
|
|
|
|
|
|
} |
434
|
|
|
|
|
|
|
|
435
|
|
|
|
|
|
|
# write curf tag to ICC profile |
436
|
|
|
|
|
|
|
# parameters: (ref_to_object, ref_to_parent_object, file_handle, ref_to_tag_table_entry) |
437
|
|
|
|
|
|
|
sub _writeICCcurf { |
438
|
|
|
|
|
|
|
|
439
|
|
|
|
|
|
|
# get parameters |
440
|
0
|
|
|
0
|
|
|
my ($self, $parent, $fh, $tag) = @_; |
441
|
|
|
|
|
|
|
|
442
|
|
|
|
|
|
|
# verify segments |
443
|
0
|
0
|
|
|
|
|
(@{$self->[1]} > 0) or carp('\'curf\' object must contain at least one segment'); |
|
0
|
|
|
|
|
|
|
444
|
|
|
|
|
|
|
|
445
|
|
|
|
|
|
|
# verify breakpoints |
446
|
0
|
0
|
|
|
|
|
(@{$self->[1]} == @{$self->[2]} + 1) or carp('\'curf\' object must contain a breakpoint between each segment'); |
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
|
|
447
|
|
|
|
|
|
|
|
448
|
|
|
|
|
|
|
# seek start of tag |
449
|
0
|
|
|
|
|
|
seek($fh, $tag->[1], 0); |
450
|
|
|
|
|
|
|
|
451
|
|
|
|
|
|
|
# write tag type signature and segment count |
452
|
0
|
|
|
|
|
|
print $fh pack('a4 x4 n x2', 'curf', scalar(@{$self->[1]})); |
|
0
|
|
|
|
|
|
|
453
|
|
|
|
|
|
|
|
454
|
|
|
|
|
|
|
# write breakpoints |
455
|
0
|
|
|
|
|
|
print $fh pack('f>*', @{$self->[2]}); |
|
0
|
|
|
|
|
|
|
456
|
|
|
|
|
|
|
|
457
|
|
|
|
|
|
|
# for each segment |
458
|
0
|
|
|
|
|
|
for my $seg (@{$self->[1]}) { |
|
0
|
|
|
|
|
|
|
459
|
|
|
|
|
|
|
|
460
|
|
|
|
|
|
|
# write segment data |
461
|
0
|
|
|
|
|
|
$seg->write_fh($self, $fh, ['curf', tell($fh)]); |
462
|
|
|
|
|
|
|
|
463
|
|
|
|
|
|
|
} |
464
|
|
|
|
|
|
|
|
465
|
|
|
|
|
|
|
} |
466
|
|
|
|
|
|
|
|
467
|
|
|
|
|
|
|
1; |