Pdf/Resource/Image/Png.php

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Zend Framework

LICENSE

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Category
Zend  
Copyright
Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)  
License
New BSD License  
Package
Zend_Pdf  
Version
$Id: Png.php 24593 2012-01-05 20:35:02Z matthew $  

\Zend_Pdf_Resource_Image_Png

Package: Zend\Pdf
PNG image
Parent(s)
\Zend_Pdf_Resource_Image < \Zend_Pdf_Resource
Copyright
Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)  
License
New BSD License  

Constants

>VConstant  PNG_COMPRESSION_DEFAULT_STRATEGY = 0
>VConstant  PNG_COMPRESSION_FILTERED = 1
>VConstant  PNG_COMPRESSION_HUFFMAN_ONLY = 2
>VConstant  PNG_COMPRESSION_RLE = 3
>VConstant  PNG_FILTER_NONE = 0
>VConstant  PNG_FILTER_SUB = 1
>VConstant  PNG_FILTER_UP = 2
>VConstant  PNG_FILTER_AVERAGE = 3
>VConstant  PNG_FILTER_PAETH = 4
>VConstant  PNG_INTERLACING_DISABLED = 0
>VConstant  PNG_INTERLACING_ENABLED = 1
>VConstant  PNG_CHANNEL_GRAY = 0
>VConstant  PNG_CHANNEL_RGB = 2
>VConstant  PNG_CHANNEL_INDEXED = 3
>VConstant  PNG_CHANNEL_GRAY_ALPHA = 4
>VConstant  PNG_CHANNEL_RGB_ALPHA = 6

Properties

>VPropertyprotected$_height
Details
Type
n/a
>VPropertyprotected$_imageProperties
Details
Type
n/a
>VPropertyprotected\Zend_Pdf_ElementFactory_Interface $_objectFactory
inherited
Each Pdf resource (fonts, images, .
Inherited from: \Zend_Pdf_Resource::$$_objectFactory\Zend_Pdf_Resource_Image::$$_objectFactory

..) interacts with a PDF itself. It creates appropriate PDF objects, structures and sometime embedded files. Resources are referenced in content streams by names, which are stored in a page resource dictionaries.

Thus, resources must be attached to the PDF.

Resource abstraction uses own PDF object factory to store all necessary information. At the render time internal object factory is appended to the global PDF file factory.

Resource abstraction also cashes information about rendered PDF files and doesn't duplicate resource description each time then Resource is rendered (referenced).

Details
Type
\Zend_Pdf_ElementFactory_Interface
Inherited_from
\Zend_Pdf_Resource::$$_objectFactory  
Inherited_from
\Zend_Pdf_Resource_Image::$$_objectFactory  
>VPropertyprotected\Zend_Pdf_Element_Object $_resource
>VPropertyprotected$_width
Details
Type
n/a

Methods

methodpublic__clone() : void
inherited

Clone page, extract it and dependent objects from the current document, so it can be used within other docs.

Inherited from: \Zend_Pdf_Resource::__clone()\Zend_Pdf_Resource_Image::__clone()
methodpublic__construct(string $imageFileName) : void

Object constructor

If resource is not a Zend_Pdf_Element object, then stream object with specified value is generated.

Parameters
NameTypeDescription
$imageFileNamestring
Throws
ExceptionDescription
\Zend_Pdf_Exception
Details
Todo
Add compression conversions to support compression strategys other than PNG_COMPRESSION_DEFAULT_STRATEGY.  
Todo
Add pre-compression filtering.  
Todo
Add interlaced image handling.  
Todo
Add support for 16-bit images. Requires PDF version bump to 1.5 at least.  
Todo
Add processing for all PNG chunks defined in the spec. gAMA etc.  
Todo
Fix tRNS chunk support for Indexed Images to a SMask.  
methodpublicgetPixelHeight() : integer

Image height

Returns
TypeDescription
integer
methodpublicgetPixelWidth() : integer

Image width

Returns
TypeDescription
integer
methodpublicgetProperties() : array

Image properties

Returns
TypeDescription
array
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