Package com.openhtmltopdf.util

Class ScalingOptions

java.lang.Object

com.openhtmltopdf.util.ScalingOptions

public class ScalingOptions
extends Object

POJO used when calling ImageUtil.getScaledInstance(ScalingOptions,java.awt.image.BufferedImage). Encapsulates a set of parameters related to scaling quality and output. Values are final once constructed, except for target width and height, which can be change and the options instance reused. There is a default constructor for average quality and performance.

Constructor Summary

Constructors

Constructor	Description
ScalingOptions()	Default scaling options, nearest neighbor interpolation, and fast downscaling.
ScalingOptions(int targetWidth, int targetHeight, int type, DownscaleQuality downscalingHint, Object hint)	Constructor with all options.
ScalingOptions(DownscaleQuality downscalingHint, Object interpolationHint)	Constructor with all options.

Method Summary

Modifier and Type	Method	Description
void	applyRenderingHints(Graphics2D g2)	Applies any rendering hints configured for these ScalingOptions to a Graphics2D instance before image operations are called on it.
DownscaleQuality	getDownscalingHint()
Object	getRenderingHint()
protected Map	getRenderingHints()	Returns a Map of image rendering hints applicable to Graphics2D.setRenderingHints(java.util.Map).
int	getTargetHeight()
int	getTargetWidth()
void	setTargetDimensions(Dimension dim)
void	setTargetHeight(int targetHeight)
void	setTargetWidth(int targetWidth)
boolean	sizeMatches(int w, int h)	Returns true if the target size specified by these options matches the size provided (e.g.
boolean	sizeMatches(Image img)	Returns true if the target size specified by these options matches the size provided (e.g.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ScalingOptions

public ScalingOptions(DownscaleQuality downscalingHint,
                      Object interpolationHint)

Constructor with all options.

Parameters:

downscalingHint - Directs downscaling quality. One of the enumerated types of DownscaleQuality such as DownscaleQuality.FAST.

interpolationHint - Hint for interpolation to AWT image renderer, one of the Object constants from RenderingHints using RenderingHints.KEY_INTERPOLATION

ScalingOptions

public ScalingOptions()

Default scaling options, nearest neighbor interpolation, and fast downscaling. This is fast, but not great quality.

ScalingOptions

public ScalingOptions(int targetWidth,
                      int targetHeight,
                      int type,
                      DownscaleQuality downscalingHint,
                      Object hint)

Constructor with all options.

Parameters:

targetWidth - Target width in pixels of image once scaled

targetHeight - Target height in pixels of image once scaled

type - Type of BufferedImage to create for output; see docs for BufferedImage(int,int,int)

downscalingHint - Directs downscaling quality. One of the enumerated types of DownscaleQuality such as DownscaleQuality.FAST.

hint - Hint for interpolation to AWT image renderer, one of the Object constants from RenderingHints using RenderingHints.KEY_INTERPOLATION

Method Detail

getDownscalingHint

public DownscaleQuality getDownscalingHint()

Returns:

the current scaling hint

getRenderingHint

public Object getRenderingHint()

Returns:

the current rendering hint

applyRenderingHints

public void applyRenderingHints(Graphics2D g2)

Applies any rendering hints configured for these ScalingOptions to a Graphics2D instance before image operations are called on it. These might be

Parameters:

g2 - A Graphics2D instance on which scaled images will be rendered.

getRenderingHints

protected Map getRenderingHints()

Returns a Map of image rendering hints applicable to Graphics2D.setRenderingHints(java.util.Map). By default, this will only include the interpolation hint specified for this ScalingOptions. Other hints could be added in a overridden version in a subclass.

Returns:

Map of rendering hints.

sizeMatches

public boolean sizeMatches(int w,
                           int h)

Returns true if the target size specified by these options matches the size provided (e.g. image is already at target size).

Parameters:

w - an image width

h - an image height

Returns:

true if image dimensions already match target size

sizeMatches

public boolean sizeMatches(Image img)

Returns true if the target size specified by these options matches the size provided (e.g. image is already at target size).

Parameters:

img -

Returns:

true if image dimensions already match target size

getTargetWidth

public int getTargetWidth()

getTargetHeight

public int getTargetHeight()

setTargetWidth

public void setTargetWidth(int targetWidth)

setTargetHeight

public void setTargetHeight(int targetHeight)

setTargetDimensions

public void setTargetDimensions(Dimension dim)