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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; /** * 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 { private $width; private $height; function __construct($width, $height) { $this->width = $width; $this->height = $height; } /** * 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 $row; An optional preallocated array. If null or too small, it will be ignored. * Always use the returned object, and ignore the .length of the array. * @return array * An array containing the luminance data. */ public abstract function getRow($y, $row); /** * Fetches luminance data for the underlying bitmap. Values should be fetched using: * {@code int luminance = array[y * width + x] & 0xff} * * @return 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. */ public abstract function getMatrix(); /** * @return The width of the bitmap. */ public final function getWidth() { return $this->width; } /** * @return The height of the bitmap. */ public final function getHeight() { return $this->height; } /** * @return Whether this subclass supports cropping. */ public function isCropSupported() { return false; } /** * Returns a new object with cropped image data. Implementations may keep a reference to the * original data rather than a copy. Only callable if isCropSupported() is true. * * @param left The left coordinate, which must be in [0,getWidth()) * @param top The top coordinate, which must be in [0,getHeight()) * @param width The width of the rectangle to crop. * @param height The height of the rectangle to crop. * @return A cropped version of this object. */ public function crop($left, $top, $width, $height) { throw new \Exception("This luminance source does not support cropping."); } /** * @return Whether this subclass supports counter-clockwise rotation. */ public function isRotateSupported() { return false; } /** * @return a wrapper of this {@code LuminanceSource} which inverts the luminances it returns -- black becomes * white and vice versa, and each value becomes (255-value). */ public function invert() { return new InvertedLuminanceSource($this); } /** * Returns a new object with rotated image data by 90 degrees counterclockwise. * Only callable if {@link #isRotateSupported()} is true. * * @return A rotated version of this object. */ public function rotateCounterClockwise() { throw new \Exception("This luminance source does not support rotation by 90 degrees."); } /** * Returns a new object with rotated image data by 45 degrees counterclockwise. * Only callable if {@link #isRotateSupported()} is true. * * @return A rotated version of this object. */ public function rotateCounterClockwise45() { throw new \Exception("This luminance source does not support rotation by 45 degrees."); } //@Override public final function toString() { $row = array(); $result = ''; for ($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) { $c = '#'; } else if ($luminance < 0x80) { $c = '+'; } else if ($luminance < 0xC0) { $c = '.'; } else { $c = ' '; } $result.=($c); } $result.=('\n'); } return $result; } }
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