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Imager-Search-1.01
River stage zero No dependents
1 ++
/ Imager::Search::Driver

NAME

Imager::Search::Driver - Abstract imlementation of a Imager::Search driver

SYNOPSIS

  # Create the search
  my $search = Imager::Search::Driver->new(
      driver => 'HTML24',
      big    => $large_imager_object,
      small  => $small_imager_object,
  );
  
  # Run the search
  my $found = $search->find_first;
  
  # Handle the result
  print "Found at row " . $found->top . " and column " . $found->left;

DESCRIPTION

Given two images (we'll call them Big and Small), where Small is contained within Big zero or more times, determine the pixel locations of Small within Big.

For example, given a screen shot or a rendered webpage, locate the position of a known icon or picture within the larger image.

The intent is to provide functionality for use in various testing scenarios, or desktop gui automation, and so on.

METHODS

new

  my $driver = Imager::Search::Driver->new;

The new constructor takes a new search driver object.

Returns a new Imager::Search::Driver object, or croaks on error.

image_string

The image_string method takes a Imager::Search::Image object, and generates the search string for the image.

Returns a reference to a scalar, or dies on error.

pattern_lines

Because of the way the regular expression spans scanlines, it requires the width of the target image in order to be fully generated. However, the sub-regexp for each scanline can be (and are) generated in advance.

When a Imager::Search::Pattern object is created, the driver method pattern_lines is called to generate the scanline regexp for the search pattern.

Returns a reference to an ARRAY containing the regexp in string form, or dies on error.

pattern_regexp

The pattern_regexp method takes a pattern and an image is retruns a fully-generated search regexp for the pattern, when used on that image.

Returns a Regexp object, or dies on error.

match_object

Once the regexp engine has located a potential match, the pattern, image and character position are provided to the match_object method.

The match_object will take the raw character position, validate that the character position is at a legimate pixel position, and then return the fully-described match.

Returns a Imager::Search::Match object if the position is valid, or false (undef in scalar context or a null string in list context) if the position is not valid.

SUPPORT

See the SUPPORT section of the main Imager::Search module.

AUTHOR

Adam Kennedy <adamk@cpan.org>

COPYRIGHT

Copyright 2007 - 2011 Adam Kennedy.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

The full text of the license can be found in the LICENSE file included with this module.