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# Copyright (c) 2015 Timm Murray |
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# All rights reserved. |
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# |
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# Redistribution and use in source and binary forms, with or without |
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# modification, are permitted provided that the following conditions are met: |
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# |
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# * Redistributions of source code must retain the above copyright notice, |
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# this list of conditions and the following disclaimer. |
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# * Redistributions in binary form must reproduce the above copyright |
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# notice, this list of conditions and the following disclaimer in the |
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# documentation and/or other materials provided with the distribution. |
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# |
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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# POSSIBILITY OF SUCH DAMAGE. |
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package Device::PCD8544::ConvertImage; |
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$Device::PCD8544::ConvertImage::VERSION = '0.0268329147520525'; |
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use v5.14; |
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use warnings; |
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use Device::PCD8544::Exceptions; |
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use constant WIDTH => 84; |
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use constant HEIGHT => 48; |
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sub convert |
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{ |
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my ($img) = @_; |
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my $width = $img->getwidth; |
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my $height = $img->getheight; |
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if( ($width != WIDTH) || ($height != HEIGHT) ) { |
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Device::PCD8544::ImageSizeException->throw( 'Width/height is' |
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. " $width/$height" |
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. ', expected is ' . WIDTH . '/' . HEIGHT |
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. '. Please rescale image.' ); |
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} |
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my @lcd_bitmap = (); |
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my $total_pixels = $width * $height; |
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for( my $i = 0; $i < $total_pixels; $i += 8 ) { |
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my $max_i = $i + 7; |
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$max_i = $total_pixels - 1 if $max_i >= $total_pixels; |
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my @pixels = _get_pixels( $img, $width, $height, $i, $max_i ); |
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my $val = $pixels[0]; |
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foreach my $j (1 .. 7) { |
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$val <<= 1; |
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$val |= $pixels[$j]; |
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} |
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push @lcd_bitmap, $val; |
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} |
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return \@lcd_bitmap; |
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} |
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sub _get_pixels |
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{ |
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my ($img, $width, $height, $i_min, $i_max) = @_; |
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my @pixels; |
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foreach my $i ($i_min .. $i_max) { |
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my $x = $i % $width; |
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my $y = int( $i / $width ); |
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my $pixel = $img->getpixel( x => $x, y => $y ); |
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my ($r, $g, $b, $a) = $pixel->rgba; |
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my $val = ($r || $g || $b) ? 0 : 1; |
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push @pixels, $val; |
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} |
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return @pixels; |
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} |
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1; |
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__END__ |