Class Png in namespace setasign\SetaPDF2\Core\Image in SetaPDF v2 API Reference

Index

\setasign\SetaPDF2
1. Core
  1. Image
    1. Exception
    2. Gif
    3. Gif
    4. Image
    5. Jpeg
    6. Jpeg2000
    7. Png

setasign\SetaPDF2\Core\Image

Png Class representing an PNG image

File: /SetaPDF v2/Core/Image/Png.php
Old class name (alias): \SetaPDF_Core_Image_Png

Class hierarchy

Image
- Png

Summary

Constants

TYPE_GIF

public const string Image::TYPE_GIF = 'gif'

Image type

TYPE_JPEG

public const string Image::TYPE_JPEG = 'jpeg'

Image type

TYPE_JPEG2000

public const string Image::TYPE_JPEG2000 = 'jpeg2000'

Image type

TYPE_PNG

public const string Image::TYPE_PNG = 'png'

Image type

TYPE_TIFF

public const string Image::TYPE_TIFF = 'tiff'

Image type

TYPE_UNKNOWN

public const string Image::TYPE_UNKNOWN = 'unknown'

Image type

Properties

$_binaryReader

protected \SetaPDF_Core_Reader_Binary Image::$_binaryReader

Binary Reader

$_bitsPerComponent

protected int Image::$_bitsPerComponent = 8

Bits per component

$_colorSpace

protected int Image::$_colorSpace = -1

The image type specific colorspace

$_dpiX

protected int Image::$_dpiX = 0

Dots-per-inch in the X direction

$_dpiY

protected int Image::$_dpiY = 0

Dots-per-inch in the Y direction

$_height

protected int Image::$_height

The pixel height

$_imageData

protected resource Png::$_imageData

Image stream data

$_inverted

protected bool Image::$_inverted = false

Flag for color inversion

$_isInterlaced

protected bool Png::$_isInterlaced

Defines whether the image is interlaced or not

$_palette

protected string Png::$_palette = ''

Palette data

$_transparency

protected array Png::$_transparency = array()

Transparency data

$_width

protected int Image::$_width

The pixel width

Static Methods

get()

public static Image::get (

\SetaPDF_Core_Reader_ReaderInterface $reader

): \SetaPDF_Core_Image

Get an image by a reader.

Parameters

$reader : \SetaPDF_Core_Reader_ReaderInterface: The reader instance

Exceptions

Throws \setasign\SetaPDF2\NotImplementedException If the image type is not supported (supported types: JPEG, PNG, JPEG2000).

getByPath()

public static Image::getByPath (

string $path

): \SetaPDF_Core_Image

Get an image by a path.

Parameters

$path : string: The path to the image

getType()

public static Image::getType (

\SetaPDF_Core_Reader_ReaderInterface $reader

): string

Get an image type by a reader.

Parameters

$reader : \SetaPDF_Core_Reader_ReaderInterface

Methods

__construct()

public Image::__construct (

?\SetaPDF_Core_Reader_ReaderInterface $reader = null

)

The constructor.

Parameters

$reader : ?\SetaPDF_Core_Reader_ReaderInterface

__destruct()

public Png::__destruct (

void

): void

Close the image stream.

_extractAlphaChannel()

protected Png::_extractAlphaChannel (

array $decodeParameters

): array

Extracts the alpha channel from the image data.

Parameters

$decodeParameters : array

Exceptions

Throws \setasign\SetaPDF2\Core\Filter\Exception

Throws \setasign\SetaPDF2\NotImplementedException

_process()

protected Png::_process (

void

): void

Processes the image data so all needed information is available.

Exceptions

Throws Exception

getBitsPerComponent()

public Image::getBitsPerComponent (

void

): int

Get the bits per component value.

getColorSpace()

public Image::getColorSpace (

void

): number

Get the image type specific colorspace.

getDpiX()

public Image::getDpiX (

void

): number

Get the dots-per-inch in the X direction.

getDpiY()

public Image::getDpiY (

void

): number

Get the dots-per-inch in the Y direction.

getHeight()

public Image::getHeight (

float $width = null

): number

Get the height.

Parameters

$width : float: Value for keeping the aspect ratio

getWidth()

public Image::getWidth (

float $height = null

): number

Get the width.

Parameters

$height : float: Value for keeping the aspect ratio

toXObject()

public Png::toXObject (

\SetaPDF_Core_Document $document

): \SetaPDF_Core_XObject_Image

Converts the PNG image to an external object.

Parameters

$document : \SetaPDF_Core_Document

Exceptions

Throws \setasign\SetaPDF2\Core\Filter\Exception

Throws Exception

Throws \setasign\SetaPDF2\NotImplementedException

See

Image::toXObject()