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62 lines
1.7 KiB
PHP
62 lines
1.7 KiB
PHP
<?php
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/**
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* Interface LuminanceSourceInterface
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*
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* @created 18.11.2021
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* @author smiley <smiley@chillerlan.net>
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* @copyright 2021 smiley
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* @license MIT
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*/
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namespace chillerlan\QRCode\Common;
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/**
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*/
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interface LuminanceSourceInterface{
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/**
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* Fetches luminance data for the underlying bitmap. Values should be fetched using:
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* `int luminance = array[y * width + x] & 0xff`
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*
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* @return array A row-major 2D array of luminance values. Do not use result $length as it may be
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* larger than $width * $height bytes on some platforms. Do not modify the contents
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* of the result.
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*/
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public function getLuminances():array;
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/**
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* @return int The width of the bitmap.
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*/
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public function getWidth():int;
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/**
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* @return int The height of the bitmap.
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*/
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public function getHeight():int;
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/**
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* Fetches one row of luminance data from the underlying platform's bitmap. Values range from
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* 0 (black) to 255 (white). Because Java does not have an unsigned byte type, callers will have
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* to bitwise and with 0xff for each value. It is preferable for implementations of this method
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* to only fetch this row rather than the whole image, since no 2D Readers may be installed and
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* getLuminances() may never be called.
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*
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* @param int $y The row to fetch, which must be in [0,getHeight())
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*
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* @return array An array containing the luminance data.
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* @throws \chillerlan\QRCode\Decoder\QRCodeDecoderException
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*/
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public function getRow(int $y):array;
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/**
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* Creates a LuminanceSource instance from the given file
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*/
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public static function fromFile(string $path):self;
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/**
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* Creates a LuminanceSource instance from the given data blob
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*/
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public static function fromBlob(string $blob):self;
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}
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