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<?php
/*
* Copyright 2009 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
namespace Zxing;
use Zxing\Common\BitMatrix;
/**
* The purpose of this class hierarchy is to abstract different bitmap implementations across
* platforms into a standard interface for requesting greyscale luminance values. The interface
* only provides immutable methods; therefore crop and rotation create copies. This is to ensure
* that one Reader does not modify the original luminance source and leave it in an unknown state
* for other Readers in the chain.
*
* @author dswitkin@google.com (Daniel Switkin)
*/
abstract class LuminanceSource
{
public function __construct(private $width, private $height)
{
}
/**
* Fetches luminance data for the underlying bitmap. Values should be fetched using:
* {@code int luminance = array[y * width + x] & 0xff}
*
* @return BitMatrix A row-major 2D array of luminance values. Do not use result.length as it may be
* larger than width * height bytes on some platforms. Do not modify the contents
* of the result.
*/
abstract public function getMatrix();
/**
* @return float The width of the bitmap.
*/
final public function getWidth(): float
{
return $this->width;
}
/**
* @return float The height of the bitmap.
*/
final public function getHeight(): float
{
return $this->height;
}
/**
* @return bool Whether this subclass supports cropping.
*/
public function isCropSupported(): bool
{
return false;
}
/**
* Returns a new object with cropped image data. Implementations may keep a reference to the
* original data rather than a copy. Only callable if isCropSupported() is true.
*
* @param $left The left coordinate, which must be in [0,getWidth())
* @param $top The top coordinate, which must be in [0,getHeight())
* @param $width The width of the rectangle to crop.
* @param $height The height of the rectangle to crop.
*
* @return mixed A cropped version of this object.
*/
abstract public function crop($left, $top, $width, $height): LuminanceSource;
/**
* @return bool Whether this subclass supports counter-clockwise rotation.
*/
public function isRotateSupported(): bool
{
return false;
}
/**
* @return a wrapper of this {@code LuminanceSource} which inverts the luminances it returns -- black becomes
* white and vice versa, and each value becomes (255-value).
*/
// public function invert()
// {
// return new InvertedLuminanceSource($this);
// }
/**
* Returns a new object with rotated image data by 90 degrees counterclockwise.
* Only callable if {@link #isRotateSupported()} is true.
*
* @return mixed A rotated version of this object.
*/
abstract public function rotateCounterClockwise(): void;
/**
* Returns a new object with rotated image data by 45 degrees counterclockwise.
* Only callable if {@link #isRotateSupported()} is true.
*
* @return mixed A rotated version of this object.
*/
abstract public function rotateCounterClockwise45(): void;
final public function toString(): string
{
$row = [];
$result = '';
for ($y = 0; $y < $this->height; $y++) {
$row = $this->getRow($y, $row);
for ($x = 0; $x < $this->width; $x++) {
$luminance = $row[$x] & 0xFF;
$c = '';
if ($luminance < 0x40) {
$c = '#';
} elseif ($luminance < 0x80) {
$c = '+';
} elseif ($luminance < 0xC0) {
$c = '.';
} else {
$c = ' ';
}
$result .= ($c);
}
$result .= ('\n');
}
return $result;
}
/**
* Fetches one row of luminance data from the underlying platform's bitmap. Values range from
* 0 (black) to 255 (white). Because Java does not have an unsigned byte type, callers will have
* to bitwise and with 0xff for each value. It is preferable for implementations of this method
* to only fetch this row rather than the whole image, since no 2D Readers may be installed and
* getMatrix() may never be called.
*
* @param $y ; The row to fetch, which must be in [0,getHeight())
* @param $row ; An optional preallocated array. If null or too small, it will be ignored.
* Always use the returned object, and ignore the .length of the array.
*
* @return array
* An array containing the luminance data.
*/
abstract public function getRow(int $y, array $row);
}
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