Package org.gnome.pango

Class FontMetrics

java.lang.Object

io.github.jwharm.javagi.base.ProxyInstance

org.gnome.pango.FontMetrics

All Implemented Interfaces:

Proxy

@Generated("io.github.jwharm.JavaGI")
public class FontMetrics
extends ProxyInstance

A PangoFontMetrics structure holds the overall metric information for a font.

The information in a PangoFontMetrics structure may be restricted to a script. The fields of this structure are private to implementations of a font backend. See the documentation of the corresponding getters for documentation of their meaning.

For an overview of the most important metrics, see:

<picture> <source srcset="fontmetrics-dark.png" media="(prefers-color-scheme: dark)"> <img alt="Font metrics" src="fontmetrics-light.png"> </picture>

Constructor Summary

Constructors

Constructor	Description
FontMetrics()	Allocate a new FontMetrics.
FontMetrics(int refCount, int ascent, int descent, int height, int approximateCharWidth, int approximateDigitWidth, int underlinePosition, int underlineThickness, int strikethroughPosition, int strikethroughThickness)	Allocate a new FontMetrics with the fields set to the provided values.
FontMetrics(int refCount, int ascent, int descent, int height, int approximateCharWidth, int approximateDigitWidth, int underlinePosition, int underlineThickness, int strikethroughPosition, int strikethroughThickness, Arena arena)	Allocate a new FontMetrics with the fields set to the provided values.
FontMetrics(Arena arena)	Allocate a new FontMetrics.
FontMetrics(MemorySegment address)	Create a FontMetrics proxy instance for the provided memory address.

Method Summary

Modifier and Type	Method	Description
int	getApproximateCharWidth()	Gets the approximate character width for a font metrics structure.
int	getApproximateDigitWidth()	Gets the approximate digit width for a font metrics structure.
int	getAscent()	Gets the ascent from a font metrics structure.
int	getDescent()	Gets the descent from a font metrics structure.
int	getHeight()	Gets the line height from a font metrics structure.
static MemoryLayout	getMemoryLayout()	The memory layout of the native struct.
int	getStrikethroughPosition()	Gets the suggested position to draw the strikethrough.
int	getStrikethroughThickness()	Gets the suggested thickness to draw for the strikethrough.
static Type	getType()	Get the GType of the FontMetrics class
int	getUnderlinePosition()	Gets the suggested position to draw the underline.
int	getUnderlineThickness()	Gets the suggested thickness to draw for the underline.
int	readApproximateCharWidth()	Read the value of the field approximate_char_width.
int	readApproximateDigitWidth()	Read the value of the field approximate_digit_width.
int	readAscent()	Read the value of the field ascent.
int	readDescent()	Read the value of the field descent.
int	readHeight()	Read the value of the field height.
int	readRefCount()	Read the value of the field ref_count.
int	readStrikethroughPosition()	Read the value of the field strikethrough_position.
int	readStrikethroughThickness()	Read the value of the field strikethrough_thickness.
int	readUnderlinePosition()	Read the value of the field underline_position.
int	readUnderlineThickness()	Read the value of the field underline_thickness.
FontMetrics	ref()	Increase the reference count of a font metrics structure by one.
void	unref()	Decrease the reference count of a font metrics structure by one.
void	writeApproximateCharWidth(int approximateCharWidth)	Write a value in the field approximate_char_width.
void	writeApproximateDigitWidth(int approximateDigitWidth)	Write a value in the field approximate_digit_width.
void	writeAscent(int ascent)	Write a value in the field ascent.
void	writeDescent(int descent)	Write a value in the field descent.
void	writeHeight(int height)	Write a value in the field height.
void	writeRefCount(int refCount)	Write a value in the field ref_count.
void	writeStrikethroughPosition(int strikethroughPosition)	Write a value in the field strikethrough_position.
void	writeStrikethroughThickness(int strikethroughThickness)	Write a value in the field strikethrough_thickness.
void	writeUnderlinePosition(int underlinePosition)	Write a value in the field underline_position.
void	writeUnderlineThickness(int underlineThickness)	Write a value in the field underline_thickness.

Methods inherited from class io.github.jwharm.javagi.base.ProxyInstance

equals, handle, hashCode

Methods inherited from class java.lang.Object

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

Constructor Details

FontMetrics

public FontMetrics(MemorySegment address)

Create a FontMetrics proxy instance for the provided memory address.

Parameters:

address - the memory address of the native object

FontMetrics

public FontMetrics(Arena arena)

Allocate a new FontMetrics.

Parameters:

arena - to control the memory allocation scope

FontMetrics

public FontMetrics()

Allocate a new FontMetrics. The memory is allocated with Arena.ofAuto().

FontMetrics

public FontMetrics(int refCount,
 int ascent,
 int descent,
 int height,
 int approximateCharWidth,
 int approximateDigitWidth,
 int underlinePosition,
 int underlineThickness,
 int strikethroughPosition,
 int strikethroughThickness,
 Arena arena)

Allocate a new FontMetrics with the fields set to the provided values.

Parameters:

refCount - value for the field refCount

ascent - value for the field ascent

descent - value for the field descent

height - value for the field height

approximateCharWidth - value for the field approximateCharWidth

approximateDigitWidth - value for the field approximateDigitWidth

underlinePosition - value for the field underlinePosition

underlineThickness - value for the field underlineThickness

strikethroughPosition - value for the field strikethroughPosition

strikethroughThickness - value for the field strikethroughThickness

arena - to control the memory allocation scope

FontMetrics

public FontMetrics(int refCount,
 int ascent,
 int descent,
 int height,
 int approximateCharWidth,
 int approximateDigitWidth,
 int underlinePosition,
 int underlineThickness,
 int strikethroughPosition,
 int strikethroughThickness)

Allocate a new FontMetrics with the fields set to the provided values. The memory is allocated with Arena.ofAuto().

Parameters:

refCount - value for the field refCount

ascent - value for the field ascent

descent - value for the field descent

height - value for the field height

approximateCharWidth - value for the field approximateCharWidth

approximateDigitWidth - value for the field approximateDigitWidth

underlinePosition - value for the field underlinePosition

underlineThickness - value for the field underlineThickness

strikethroughPosition - value for the field strikethroughPosition

strikethroughThickness - value for the field strikethroughThickness

Method Details

getType

public static Type getType()

Get the GType of the FontMetrics class

Returns:

the GType

getMemoryLayout

public static MemoryLayout getMemoryLayout()

The memory layout of the native struct.

Returns:

the memory layout

readRefCount

public int readRefCount()

Read the value of the field ref_count.

Returns:

The value of the field ref_count

writeRefCount

public void writeRefCount(int refCount)

Write a value in the field ref_count.

Parameters:

refCount - The new value for the field ref_count

readAscent

public int readAscent()

Read the value of the field ascent.

Returns:

The value of the field ascent

writeAscent

public void writeAscent(int ascent)

Write a value in the field ascent.

Parameters:

ascent - The new value for the field ascent

readDescent

public int readDescent()

Read the value of the field descent.

Returns:

The value of the field descent

writeDescent

public void writeDescent(int descent)

Write a value in the field descent.

Parameters:

descent - The new value for the field descent

readHeight

public int readHeight()

Read the value of the field height.

Returns:

The value of the field height

writeHeight

public void writeHeight(int height)

Write a value in the field height.

Parameters:

height - The new value for the field height

readApproximateCharWidth

public int readApproximateCharWidth()

Read the value of the field approximate_char_width.

Returns:

The value of the field approximate_char_width

writeApproximateCharWidth

public void writeApproximateCharWidth(int approximateCharWidth)

Write a value in the field approximate_char_width.

Parameters:

approximateCharWidth - The new value for the field approximate_char_width

readApproximateDigitWidth

public int readApproximateDigitWidth()

Read the value of the field approximate_digit_width.

Returns:

The value of the field approximate_digit_width

writeApproximateDigitWidth

public void writeApproximateDigitWidth(int approximateDigitWidth)

Write a value in the field approximate_digit_width.

Parameters:

approximateDigitWidth - The new value for the field approximate_digit_width

readUnderlinePosition

public int readUnderlinePosition()

Read the value of the field underline_position.

Returns:

The value of the field underline_position

writeUnderlinePosition

public void writeUnderlinePosition(int underlinePosition)

Write a value in the field underline_position.

Parameters:

underlinePosition - The new value for the field underline_position

readUnderlineThickness

public int readUnderlineThickness()

Read the value of the field underline_thickness.

Returns:

The value of the field underline_thickness

writeUnderlineThickness

public void writeUnderlineThickness(int underlineThickness)

Write a value in the field underline_thickness.

Parameters:

underlineThickness - The new value for the field underline_thickness

readStrikethroughPosition

public int readStrikethroughPosition()

Read the value of the field strikethrough_position.

Returns:

The value of the field strikethrough_position

writeStrikethroughPosition

public void writeStrikethroughPosition(int strikethroughPosition)

Write a value in the field strikethrough_position.

Parameters:

strikethroughPosition - The new value for the field strikethrough_position

readStrikethroughThickness

public int readStrikethroughThickness()

Read the value of the field strikethrough_thickness.

Returns:

The value of the field strikethrough_thickness

writeStrikethroughThickness

public void writeStrikethroughThickness(int strikethroughThickness)

Write a value in the field strikethrough_thickness.

Parameters:

strikethroughThickness - The new value for the field strikethrough_thickness

getApproximateCharWidth

public int getApproximateCharWidth()

Gets the approximate character width for a font metrics structure.

This is merely a representative value useful, for example, for determining the initial size for a window. Actual characters in text will be wider and narrower than this.

Returns:

the character width, in Pango units.

getApproximateDigitWidth

public int getApproximateDigitWidth()

Gets the approximate digit width for a font metrics structure.

This is merely a representative value useful, for example, for determining the initial size for a window. Actual digits in text can be wider or narrower than this, though this value is generally somewhat more accurate than the result of pango_font_metrics_get_approximate_char_width() for digits.

Returns:

the digit width, in Pango units.

getAscent

public int getAscent()

Gets the ascent from a font metrics structure.

The ascent is the distance from the baseline to the logical top of a line of text. (The logical top may be above or below the top of the actual drawn ink. It is necessary to lay out the text to figure where the ink will be.)

Returns:

the ascent, in Pango units.

getDescent

public int getDescent()

Gets the descent from a font metrics structure.

The descent is the distance from the baseline to the logical bottom of a line of text. (The logical bottom may be above or below the bottom of the actual drawn ink. It is necessary to lay out the text to figure where the ink will be.)

Returns:

the descent, in Pango units.

getHeight

public int getHeight()

Gets the line height from a font metrics structure.

The line height is the recommended distance between successive baselines in wrapped text using this font.

If the line height is not available, 0 is returned.

Returns:

the height, in Pango units

getStrikethroughPosition

public int getStrikethroughPosition()

Gets the suggested position to draw the strikethrough.

The value returned is the distance above the baseline of the top of the strikethrough.

Returns:

the suggested strikethrough position, in Pango units.

getStrikethroughThickness

public int getStrikethroughThickness()

Gets the suggested thickness to draw for the strikethrough.

Returns:

the suggested strikethrough thickness, in Pango units.

getUnderlinePosition

public int getUnderlinePosition()

Gets the suggested position to draw the underline.

The value returned is the distance above the baseline of the top of the underline. Since most fonts have underline positions beneath the baseline, this value is typically negative.

Returns:

the suggested underline position, in Pango units.

getUnderlineThickness

public int getUnderlineThickness()

Gets the suggested thickness to draw for the underline.

Returns:

the suggested underline thickness, in Pango units.

ref

public FontMetrics ref()

Increase the reference count of a font metrics structure by one.

Returns:

this FontMetrics

unref

public void unref()

Decrease the reference count of a font metrics structure by one.

If the result is zero, frees the structure and any associated memory.