Horde_Image_Png
extends Horde_Image_Base
in package
This class implements the Horde_Image API for PNG images.
It mainly provides some utility functions, such as the ability to make pixels or solid images for now.
Tags
Table of Contents
- $_background : string
- Background color.
- $_capabilities : array<string|int, mixed>
- Capabilites of this driver.
- $_colorDepth : int
- Color depth (only 8 and 16 implemented).
- $_colorType : int
- Color type (only 2 (true color) implemented).
- $_compressionMethod : int
- Compression method (0 is the only current valid value).
- $_context : mixed
- Cache the context
- $_data : Horde_Stream
- The current image data.
- $_filterMethod : int
- Filter method (0 is the only current valid value).
- $_height : int
- The current height of the image data.
- $_img : array<string|int, mixed>
- The array of pixel data.
- $_interlaceMethod : int
- Interlace method (only 0 (no interlace) implemented).
- $_loadedEffects : array<string|int, mixed>
- Array containing available Effects
- $_logger : mixed
- Logger.
- $_tmpdir : string
- A directory for temporary files.
- $_type : string
- What kind of images should ImageMagick generate? Defaults to 'png'.
- $_width : int
- The current width of the image data.
- __call() : mixed
- Catch-all method so that we don't error out when calling an unsupported manipulation method.
- __construct() : mixed
- PNG image constructor.
- addEffect() : mixed
- Attempts to apply requested effect to this image.
- applyEffects() : mixed
- Applies any effects in the effect queue.
- brush() : mixed
- Draws a shaped point at the specified (x,y) point.
- clearGeometry() : mixed
- Utility function to zero out cached geometry information.
- display() : mixed
- Displays the current image.
- getCapabilities() : array<string|int, mixed>
- Returns the capabilities.
- getContentType() : string
- Returns the MIME type for this image.
- getDimensions() : array<string|int, mixed>
- Returns the height and width of the current image data.
- getImageAtIndex() : Horde_Image_Png
- Requests a specific image from the collection of images.
- getImagePageCount() : int
- Returns the number of image pages available in the image object.
- getLoadedEffects() : mixed
- Returns a list of available effects for this driver.
- getTmpDir() : string
- Returns the current temporary directory.
- getType() : string
- Returns the image type.
- hasCapability() : bool
- Checks the existence of a particular capability.
- headers() : mixed
- Sends HTTP headers for the image.
- loadFile() : mixed
- Loads the image data from a file.
- loadString() : mixed
- Loads the image data from a string.
- raw() : string
- Returns the raw data for this image.
- rectangle() : mixed
- Draws a rectangle.
- reset() : mixed
- Resets the image data to defaults.
- setType() : string
- Sets the output image type.
- toFile() : string
- Saves image data to file.
- _Adler32() : mixed
- Calculates an Adler32 checksum for a string.
- _header() : mixed
- Creates the PNG file header.
- _IDAT() : mixed
- Creates the IDAT block.
- _IEND() : mixed
- Creates the IEND block.
- _IHDR() : mixed
- Creates the IHDR block.
- _logDebug() : mixed
- Logs a message at debug level.
- _logErr() : mixed
- Logs a message at error level.
- _tEXt() : mixed
- Creates the tEXt block.
- _tIME() : mixed
- Creates the tIME block.
Properties
$_background
Background color.
protected
string
$_background
= 'white'
$_capabilities
Capabilites of this driver.
protected
array<string|int, mixed>
$_capabilities
= array()
$_colorDepth
Color depth (only 8 and 16 implemented).
protected
int
$_colorDepth
= 8
$_colorType
Color type (only 2 (true color) implemented).
protected
int
$_colorType
= 2
$_compressionMethod
Compression method (0 is the only current valid value).
protected
int
$_compressionMethod
= 0
$_context
Cache the context
protected
mixed
$_context
$_data
The current image data.
protected
Horde_Stream
$_data
$_filterMethod
Filter method (0 is the only current valid value).
protected
int
$_filterMethod
= 0
$_height
The current height of the image data.
protected
int
$_height
= 0
$_img
The array of pixel data.
protected
array<string|int, mixed>
$_img
= array()
$_interlaceMethod
Interlace method (only 0 (no interlace) implemented).
protected
int
$_interlaceMethod
= 0
$_loadedEffects
Array containing available Effects
protected
array<string|int, mixed>
$_loadedEffects
= array()
$_logger
Logger.
protected
mixed
$_logger
$_tmpdir
A directory for temporary files.
protected
string
$_tmpdir
$_type
What kind of images should ImageMagick generate? Defaults to 'png'.
protected
string
$_type
= 'png'
$_width
The current width of the image data.
protected
int
$_width
= 0
Methods
__call()
Catch-all method so that we don't error out when calling an unsupported manipulation method.
public
__call(mixed $method, mixed $args) : mixed
Parameters
- $method : mixed
- $args : mixed
Return values
mixed —__construct()
PNG image constructor.
public
__construct(mixed $params[, mixed $context = array() ]) : mixed
Parameters
- $params : mixed
-
The image object parameters. Values include:
- background: (string) The background color. DEFAULT: white.
- data: (string) The image binary data.
- height: (integer) The desired image height.
- type: (string) The output image type (png, jpeg etc.). DEFAULT: png.
- width: (integer) The desired image width.
- $context : mixed = array()
-
The object context - configuration, injected objects:
- logger: (Horde_Log_Logger) A logger.
- tmpdir: [REQUIRED] (string) Temporary directory.
Return values
mixed —addEffect()
Attempts to apply requested effect to this image.
public
addEffect(string $type, array<string|int, mixed> $params) : mixed
Parameters
- $type : string
-
The type of effect to apply.
- $params : array<string|int, mixed>
-
Any parameters for the effect.
Return values
mixed —applyEffects()
Applies any effects in the effect queue.
public
applyEffects() : mixed
Return values
mixed —brush()
Draws a shaped point at the specified (x,y) point.
public
brush(int $x, int $y[, string $color = 'black' ][, string $shape = 'square' ]) : mixed
Useful for scatter diagrams, debug points, etc. Draws squares, circles, diamonds, and triangles.
Parameters
- $x : int
-
The x coordinate of the point to brush.
- $y : int
-
The y coordinate of the point to brush.
- $color : string = 'black'
-
The color to brush the point with.
- $shape : string = 'square'
-
What brush to use? Defaults to a square.
Return values
mixed —clearGeometry()
Utility function to zero out cached geometry information.
public
clearGeometry() : mixed
Shouldn't really be called from client code, but is needed since effects may need to clear these.
Return values
mixed —display()
Displays the current image.
public
display() : mixed
Return values
mixed —getCapabilities()
Returns the capabilities.
public
getCapabilities() : array<string|int, mixed>
Return values
array<string|int, mixed> —A list of backend capabilities.
getContentType()
Returns the MIME type for this image.
public
getContentType() : string
Return values
string —The MIME type for this image.
getDimensions()
Returns the height and width of the current image data.
public
getDimensions() : array<string|int, mixed>
Return values
array<string|int, mixed> —An hash with 'width' containing the width, 'height' containing the height of the image.
getImageAtIndex()
Requests a specific image from the collection of images.
public
getImageAtIndex(int $index) : Horde_Image_Png
Parameters
- $index : int
-
The index to return
Tags
Return values
Horde_Image_Png —getImagePageCount()
Returns the number of image pages available in the image object.
public
getImagePageCount() : int
Return values
int —The number of images.
getLoadedEffects()
Returns a list of available effects for this driver.
public
getLoadedEffects() : mixed
Return values
mixed —getTmpDir()
Returns the current temporary directory.
public
getTmpDir() : string
Return values
string —The current temporary directory.
getType()
Returns the image type.
public
getType() : string
Return values
string —The type of this image (png, jpg, etc.).
hasCapability()
Checks the existence of a particular capability.
public
hasCapability(string $capability) : bool
Parameters
- $capability : string
-
The capability to check for.
Return values
bool —True if the backend has this capability.
headers()
Sends HTTP headers for the image.
public
headers() : mixed
Return values
mixed —loadFile()
Loads the image data from a file.
public
loadFile(string $filename) : mixed
Parameters
- $filename : string
-
The full path and filename to the file to load the image data from.
Tags
Return values
mixed —loadString()
Loads the image data from a string.
public
loadString(mixed $image_data) : mixed
Parameters
- $image_data : mixed
-
The data to use for the image as a string, Horde_Stream, or stream resource.
Return values
mixed —raw()
Returns the raw data for this image.
public
raw() : string
Return values
string —The raw image data.
rectangle()
Draws a rectangle.
public
rectangle(int $x, int $y, int $width, int $height[, string $color = 'black' ][, string $fill = 'none' ]) : mixed
Parameters
- $x : int
-
The left x-coordinate of the rectangle.
- $y : int
-
The top y-coordinate of the rectangle.
- $width : int
-
The width of the rectangle.
- $height : int
-
The height of the rectangle.
- $color : string = 'black'
-
The line color of the rectangle.
- $fill : string = 'none'
-
The color to fill the rectangle.
Return values
mixed —reset()
Resets the image data to defaults.
public
reset() : mixed
Return values
mixed —setType()
Sets the output image type.
public
setType(string $type) : string
Parameters
- $type : string
-
An image type (png, jpg, etc.)
Return values
string —The previous image type.
toFile()
Saves image data to file.
public
toFile([mixed $data = null ]) : string
If $data is false-ish, saves current image data after performing pending operations on the data. If $data contains raw image data, saves that data to file without regard for the current image data.
Parameters
- $data : mixed = null
Tags
Return values
string —Path to temporary file.
_Adler32()
Calculates an Adler32 checksum for a string.
protected
_Adler32(mixed $input) : mixed
Parameters
- $input : mixed
Return values
mixed —_header()
Creates the PNG file header.
protected
_header() : mixed
Return values
mixed —_IDAT()
Creates the IDAT block.
protected
_IDAT() : mixed
Return values
mixed —_IEND()
Creates the IEND block.
protected
_IEND() : mixed
Return values
mixed —_IHDR()
Creates the IHDR block.
protected
_IHDR() : mixed
Return values
mixed —_logDebug()
Logs a message at debug level.
protected
_logDebug(string $message) : mixed
Parameters
- $message : string
-
The log message.
Return values
mixed —_logErr()
Logs a message at error level.
protected
_logErr(string $message) : mixed
Parameters
- $message : string
-
The log message.
Return values
mixed —_tEXt()
Creates the tEXt block.
protected
_tEXt(mixed $keyword, mixed $text) : mixed
Parameters
- $keyword : mixed
- $text : mixed
Return values
mixed —_tIME()
Creates the tIME block.
protected
_tIME([int $date = null ]) : mixed
Parameters
- $date : int = null
-
A timestamp.