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<?php
/**
* Zend Framework (http://framework.zend.com/)
*
* @link http://github.com/zendframework/zf2 for the canonical source repository
* @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @package Zend_Pdf
*/
namespace ZendPdf;
use ZendPdf\Exception;
/**
* Abstract factory class which vends {@link \ZendPdf\Resource\Image\AbstractImage} objects.
*
* This class is also the home for image-related constants because the name of
* the true base class ({@link \ZendPdf\Resource\Image\AbstractImage}) is not intuitive
* for the end user.
*
* @package Zend_PDF
* @subpackage Zend_PDF_Image
*/
abstract class Image
{
/**** Class Constants ****/
/* Image Types */
const TYPE_UNKNOWN = 0;
const TYPE_JPEG = 1;
const TYPE_PNG = 2;
const TYPE_TIFF = 3;
/* TIFF Constants */
const TIFF_FIELD_TYPE_BYTE=1;
const TIFF_FIELD_TYPE_ASCII=2;
const TIFF_FIELD_TYPE_SHORT=3;
const TIFF_FIELD_TYPE_LONG=4;
const TIFF_FIELD_TYPE_RATIONAL=5;
const TIFF_TAG_IMAGE_WIDTH=256;
const TIFF_TAG_IMAGE_LENGTH=257; //Height
const TIFF_TAG_BITS_PER_SAMPLE=258;
const TIFF_TAG_COMPRESSION=259;
const TIFF_TAG_PHOTOMETRIC_INTERPRETATION=262;
const TIFF_TAG_STRIP_OFFSETS=273;
const TIFF_TAG_SAMPLES_PER_PIXEL=277;
const TIFF_TAG_STRIP_BYTE_COUNTS=279;
const TIFF_COMPRESSION_UNCOMPRESSED = 1;
const TIFF_COMPRESSION_CCITT1D = 2;
const TIFF_COMPRESSION_GROUP_3_FAX = 3;
const TIFF_COMPRESSION_GROUP_4_FAX = 4;
const TIFF_COMPRESSION_LZW = 5;
const TIFF_COMPRESSION_JPEG = 6;
const TIFF_COMPRESSION_FLATE = 8;
const TIFF_COMPRESSION_FLATE_OBSOLETE_CODE = 32946;
const TIFF_COMPRESSION_PACKBITS = 32773;
const TIFF_PHOTOMETRIC_INTERPRETATION_WHITE_IS_ZERO=0;
const TIFF_PHOTOMETRIC_INTERPRETATION_BLACK_IS_ZERO=1;
const TIFF_PHOTOMETRIC_INTERPRETATION_RGB=2;
const TIFF_PHOTOMETRIC_INTERPRETATION_RGB_INDEXED=3;
const TIFF_PHOTOMETRIC_INTERPRETATION_CMYK=5;
const TIFF_PHOTOMETRIC_INTERPRETATION_YCBCR=6;
const TIFF_PHOTOMETRIC_INTERPRETATION_CIELAB=8;
/* PNG Constants */
const PNG_COMPRESSION_DEFAULT_STRATEGY = 0;
const PNG_COMPRESSION_FILTERED = 1;
const PNG_COMPRESSION_HUFFMAN_ONLY = 2;
const PNG_COMPRESSION_RLE = 3;
const PNG_FILTER_NONE = 0;
const PNG_FILTER_SUB = 1;
const PNG_FILTER_UP = 2;
const PNG_FILTER_AVERAGE = 3;
const PNG_FILTER_PAETH = 4;
const PNG_INTERLACING_DISABLED = 0;
const PNG_INTERLACING_ENABLED = 1;
const PNG_CHANNEL_GRAY = 0;
const PNG_CHANNEL_RGB = 2;
const PNG_CHANNEL_INDEXED = 3;
const PNG_CHANNEL_GRAY_ALPHA = 4;
const PNG_CHANNEL_RGB_ALPHA = 6;
/**** Public Interface ****/
/* Factory Methods */
/**
* Returns a {@link \ZendPdf\Resource\Image\AbstractImage} object by file path.
*
* @param string $filePath Full path to the image file.
* @return \ZendPdf\Resource\Image\AbstractImage
* @throws \ZendPdf\Exception\ExceptionInterface
*/
public static function imageWithPath($filePath)
{
/**
* use old implementation
* @todo switch to new implementation
*/
return Resource\Image\ImageFactory::factory($filePath);
/* Create a file parser data source object for this file. File path and
* access permission checks are handled here.
*/
$dataSource = new BinaryParser\DataSource\File($filePath);
/* Attempt to determine the type of image. We can't always trust file
* extensions, but try that first since it's fastest.
*/
$fileExtension = strtolower(pathinfo($filePath, PATHINFO_EXTENSION));
/* If it turns out that the file is named improperly and we guess the
* wrong type, we'll get null instead of an image object.
*/
switch ($fileExtension) {
case 'tif':
//Fall through to next case;
case 'tiff':
$image = self::_extractTiffImage($dataSource);
break;
case 'png':
$image = self::_extractPngImage($dataSource);
break;
case 'jpg':
//Fall through to next case;
case 'jpe':
//Fall through to next case;
case 'jpeg':
$image = self::_extractJpegImage($dataSource);
break;
default:
throw new Exception\DomainException('Cannot create image resource. File extension not known or unsupported type.');
break;
}
/* Done with the data source object.
*/
$dataSource = null;
if ($image !== null) {
return $image;
} else {
/* The type of image could not be determined. Give up.
*/
throw new Exception\DomainException("Cannot determine image type: $filePath");
}
}
/**** Internal Methods ****/
/* Image Extraction Methods */
/**
* Attempts to extract a JPEG Image from the data source.
*
* @param \ZendPdf\BinaryParser\DataSource\AbstractDataSource $dataSource
* @return \ZendPdf\Resource\Image\Jpeg May also return null if
* the data source does not appear to contain valid image data.
* @throws \ZendPdf\Exception\ExceptionInterface
*/
protected static function _extractJpegImage($dataSource)
{
throw new Exception\NotImplementedException('Jpeg image fileparser is not implemented. Old styly implementation has to be used.');
$imageParser = new BinaryParser\Image\Jpeg($dataSource);
$image = new Resource\Image\Jpeg($imageParser);
unset($imageParser);
return $image;
}
/**
* Attempts to extract a PNG Image from the data source.
*
* @param \ZendPdf\BinaryParser\DataSource\AbstractDataSource $dataSource
* @return \ZendPdf\Resource\Image\Png May also return null if
* the data source does not appear to contain valid image data.
*/
protected static function _extractPngImage($dataSource)
{
$imageParser = new BinaryParser\Image\Png($dataSource);
$image = new Resource\Image\Png($imageParser);
unset($imageParser);
return $image;
}
/**
* Attempts to extract a TIFF Image from the data source.
*
* @param \ZendPdf\BinaryParser\DataSource\AbstractDataSource $dataSource
* @return \ZendPdf\Resource\Image\Tiff May also return null if
* the data source does not appear to contain valid image data.
* @throws \ZendPdf\Exception\ExceptionInterface
*/
protected static function _extractTiffImage($dataSource)
{
throw new Exception\NotImplementedException('Tiff image fileparser is not implemented. Old styly implementation has to be used.');
$imageParser = new BinaryParser\Image\Tiff($dataSource);
$image = new Resource\Image\Tiff($imageParser);
unset($imageParser);
return $image;
}
}
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