gi-pango-1.0.16: Pango bindings

CopyrightWill Thompson Iñaki García Etxebarria and Jonas Platte
LicenseLGPL-2.1
MaintainerIñaki García Etxebarria (garetxe@gmail.com)
Safe HaskellNone
LanguageHaskell2010

GI.Pango.Functions

Contents

Description

 
Synopsis

Methods

attrBackgroundAlphaNew

attrBackgroundAlphaNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Word16

alpha: the alpha value, between 1 and 65536

-> m Attribute

Returns: the new allocated Attribute, which should be freed with attributeDestroy.

Create a new background alpha attribute.

Since: 1.38

attrBackgroundNew

attrBackgroundNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Word16

red: the red value (ranging from 0 to 65535)

-> Word16

green: the green value

-> Word16

blue: the blue value

-> m Attribute

Returns: the newly allocated Attribute, which should be freed with attributeDestroy.

Create a new background color attribute.

attrFallbackNew

attrFallbackNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Bool

enableFallback: True if we should fall back on other fonts for characters the active font is missing.

-> m Attribute

Returns: the newly allocated Attribute, which should be freed with attributeDestroy.

Create a new font fallback attribute.

If fallback is disabled, characters will only be used from the closest matching font on the system. No fallback will be done to other fonts on the system that might contain the characters in the text.

Since: 1.4

attrFamilyNew

attrFamilyNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Text

family: the family or comma separated list of families

-> m Attribute

Returns: the newly allocated Attribute, which should be freed with attributeDestroy.

Create a new font family attribute.

attrForegroundAlphaNew

attrForegroundAlphaNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Word16

alpha: the alpha value, between 1 and 65536

-> m Attribute

Returns: the new allocated Attribute, which should be freed with attributeDestroy.

Create a new foreground alpha attribute.

Since: 1.38

attrForegroundNew

attrForegroundNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Word16

red: the red value (ranging from 0 to 65535)

-> Word16

green: the green value

-> Word16

blue: the blue value

-> m Attribute

Returns: the newly allocated Attribute, which should be freed with attributeDestroy.

Create a new foreground color attribute.

attrGravityHintNew

attrGravityHintNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> GravityHint

hint: the gravity hint value.

-> m Attribute

Returns: the newly allocated Attribute, which should be freed with attributeDestroy.

Create a new gravity hint attribute.

Since: 1.16

attrGravityNew

attrGravityNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Gravity

gravity: the gravity value; should not be GravityAuto.

-> m Attribute

Returns: the newly allocated Attribute, which should be freed with attributeDestroy.

Create a new gravity attribute.

Since: 1.16

attrLetterSpacingNew

attrLetterSpacingNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Int32

letterSpacing: amount of extra space to add between graphemes of the text, in Pango units.

-> m Attribute

Returns: the newly allocated Attribute, which should be freed with attributeDestroy.

Create a new letter-spacing attribute.

Since: 1.6

attrRiseNew

attrRiseNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Int32

rise: the amount that the text should be displaced vertically, in Pango units. Positive values displace the text upwards.

-> m Attribute

Returns: the newly allocated Attribute, which should be freed with attributeDestroy.

Create a new baseline displacement attribute.

attrScaleNew

attrScaleNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Double

scaleFactor: factor to scale the font

-> m Attribute

Returns: the newly allocated Attribute, which should be freed with attributeDestroy.

Create a new font size scale attribute. The base font for the affected text will have its size multiplied by scaleFactor.

attrStretchNew

attrStretchNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Stretch

stretch: the stretch

-> m Attribute

Returns: the newly allocated Attribute, which should be freed with attributeDestroy.

Create a new font stretch attribute

attrStrikethroughColorNew

attrStrikethroughColorNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Word16

red: the red value (ranging from 0 to 65535)

-> Word16

green: the green value

-> Word16

blue: the blue value

-> m Attribute

Returns: the newly allocated Attribute, which should be freed with attributeDestroy.

Create a new strikethrough color attribute. This attribute modifies the color of strikethrough lines. If not set, strikethrough lines will use the foreground color.

Since: 1.8

attrStrikethroughNew

attrStrikethroughNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Bool

strikethrough: True if the text should be struck-through.

-> m Attribute

Returns: the newly allocated Attribute, which should be freed with attributeDestroy.

Create a new strike-through attribute.

attrStyleNew

attrStyleNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Style

style: the slant style

-> m Attribute

Returns: the newly allocated Attribute, which should be freed with attributeDestroy.

Create a new font slant style attribute.

attrUnderlineColorNew

attrUnderlineColorNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Word16

red: the red value (ranging from 0 to 65535)

-> Word16

green: the green value

-> Word16

blue: the blue value

-> m Attribute

Returns: the newly allocated Attribute, which should be freed with attributeDestroy.

Create a new underline color attribute. This attribute modifies the color of underlines. If not set, underlines will use the foreground color.

Since: 1.8

attrUnderlineNew

attrUnderlineNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Underline

underline: the underline style.

-> m Attribute

Returns: the newly allocated Attribute, which should be freed with attributeDestroy.

Create a new underline-style attribute.

attrVariantNew

attrVariantNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Variant

variant: the variant

-> m Attribute

Returns: the newly allocated Attribute, which should be freed with attributeDestroy.

Create a new font variant attribute (normal or small caps)

attrWeightNew

attrWeightNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Weight

weight: the weight

-> m Attribute

Returns: the newly allocated Attribute, which should be freed with attributeDestroy.

Create a new font weight attribute.

break

break Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Text

text: the text to process

-> Int32

length: length of text in bytes (may be -1 if text is nul-terminated)

-> Analysis

analysis: Analysis structure from itemize

-> [LogAttr]

attrs: an array to store character information in

-> m () 

Determines possible line, word, and character breaks for a string of Unicode text with a single analysis. For most purposes you may want to use getLogAttrs.

configKeyGet

configKeyGet Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Text

key: Key to look up, in the form "SECTION/KEY".

-> m Text

Returns: Nothing

Deprecated: (Since version 1.38)

Do not use. Does not do anything.

configKeyGetSystem

configKeyGetSystem Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Text

key: Key to look up, in the form "SECTION/KEY".

-> m Text

Returns: Nothing

Deprecated: (Since version 1.38)

Do not use. Does not do anything.

defaultBreak

defaultBreak Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Text

text: text to break

-> Int32

length: length of text in bytes (may be -1 if text is nul-terminated)

-> Maybe Analysis

analysis: a Analysis for the text

-> LogAttr

attrs: logical attributes to fill in

-> Int32

attrsLen: size of the array passed as attrs

-> m () 

This is the default break algorithm, used if no language engine overrides it. Normally you should use break instead. Unlike break, analysis can be Nothing, but only do that if you know what you're doing. If you need an analysis to pass to break, you need to itemize. In most cases however you should simply use getLogAttrs.

extentsToPixels

extentsToPixels Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Maybe Rectangle

inclusive: rectangle to round to pixels inclusively, or Nothing.

-> Maybe Rectangle

nearest: rectangle to round to nearest pixels, or Nothing.

-> m () 

Converts extents from Pango units to device units, dividing by the SCALE factor and performing rounding.

The inclusive rectangle is converted by flooring the x/y coordinates and extending width/height, such that the final rectangle completely includes the original rectangle.

The nearest rectangle is converted by rounding the coordinates of the rectangle to the nearest device unit (pixel).

The rule to which argument to use is: if you want the resulting device-space rectangle to completely contain the original rectangle, pass it in as inclusive. If you want two touching-but-not-overlapping rectangles stay touching-but-not-overlapping after rounding to device units, pass them in as nearest.

Since: 1.16

findBaseDir

findBaseDir Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Text

text: the text to process

-> Int32

length: length of text in bytes (may be -1 if text is nul-terminated)

-> m Direction

Returns: The direction corresponding to the first strong character. If no such character is found, then DirectionNeutral is returned.

Searches a string the first character that has a strong direction, according to the Unicode bidirectional algorithm.

Since: 1.4

findParagraphBoundary

findParagraphBoundary Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Text

text: UTF-8 text

-> Int32

length: length of text in bytes, or -1 if nul-terminated

-> m (Int32, Int32) 

Locates a paragraph boundary in text. A boundary is caused by delimiter characters, such as a newline, carriage return, carriage return-newline pair, or Unicode paragraph separator character. The index of the run of delimiters is returned in paragraphDelimiterIndex. The index of the start of the paragraph (index after all delimiters) is stored in nextParagraphStart.

If no delimiters are found, both paragraphDelimiterIndex and nextParagraphStart are filled with the length of text (an index one off the end).

getLibSubdirectory

getLibSubdirectory Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> m Text

Returns: the Pango lib directory. The returned string should not be freed.

Deprecated: (Since version 1.38)

Returns the name of the "pango" subdirectory of LIBDIR (which is set at compile time).

getLogAttrs

getLogAttrs Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Text

text: text to process

-> Int32

length: length in bytes of text

-> Int32

level: embedding level, or -1 if unknown

-> Language

language: language tag

-> [LogAttr]

logAttrs: array with one LogAttr per character in text, plus one extra, to be filled in

-> m () 

Computes a LogAttr for each character in text. The logAttrs array must have one LogAttr for each position in text; if text contains N characters, it has N+1 positions, including the last position at the end of the text. text should be an entire paragraph; logical attributes can't be computed without context (for example you need to see spaces on either side of a word to know the word is a word).

getMirrorChar

getMirrorChar Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Char

ch: a Unicode character

-> Char

mirroredCh: location to store the mirrored character

-> m Bool

Returns: True if ch has a mirrored character and mirroredCh is filled in, False otherwise

If ch has the Unicode mirrored property and there is another Unicode character that typically has a glyph that is the mirror image of ch's glyph, puts that character in the address pointed to by mirroredCh.

Use unicharGetMirrorChar instead; the docs for that function provide full details.

getSysconfSubdirectory

getSysconfSubdirectory Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> m Text

Returns: the Pango sysconf directory. The returned string should not be freed.

Deprecated: (Since version 1.38)

Returns the name of the "pango" subdirectory of SYSCONFDIR (which is set at compile time).

isZeroWidth

isZeroWidth Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Char

ch: a Unicode character

-> m Bool

Returns: True if ch is a zero-width character, False otherwise

Checks ch to see if it is a character that should not be normally rendered on the screen. This includes all Unicode characters with "ZERO WIDTH" in their name, as well as <firstterm>bidi</firstterm> formatting characters, and a few other ones. This is totally different from unicharIszerowidth and is at best misnamed.

Since: 1.10

itemize

itemize Source #

Arguments

:: (HasCallStack, MonadIO m, IsContext a) 
=> a

context: a structure holding information that affects the itemization process.

-> Text

text: the text to itemize.

-> Int32

startIndex: first byte in text to process

-> Int32

length: the number of bytes (not characters) to process after startIndex. This must be >= 0.

-> AttrList

attrs: the set of attributes that apply to text.

-> Maybe AttrIterator

cachedIter: Cached attribute iterator, or Nothing

-> m [Item]

Returns: a List of Item structures. The items should be freed using itemFree probably in combination with g_list_foreach(), and the list itself using g_list_free().

Breaks a piece of text into segments with consistent directional level and shaping engine. Each byte of text will be contained in exactly one of the items in the returned list; the generated list of items will be in logical order (the start offsets of the items are ascending).

cachedIter should be an iterator over attrs currently positioned at a range before or containing startIndex; cachedIter will be advanced to the range covering the position just after startIndex + length. (i.e. if itemizing in a loop, just keep passing in the same cachedIter).

itemizeWithBaseDir

itemizeWithBaseDir Source #

Arguments

:: (HasCallStack, MonadIO m, IsContext a) 
=> a

context: a structure holding information that affects the itemization process.

-> Direction

baseDir: base direction to use for bidirectional processing

-> Text

text: the text to itemize.

-> Int32

startIndex: first byte in text to process

-> Int32

length: the number of bytes (not characters) to process after startIndex. This must be >= 0.

-> AttrList

attrs: the set of attributes that apply to text.

-> Maybe AttrIterator

cachedIter: Cached attribute iterator, or Nothing

-> m [Item]

Returns: a List of Item structures. The items should be freed using itemFree probably in combination with g_list_foreach(), and the list itself using g_list_free().

Like itemize, but the base direction to use when computing bidirectional levels (see pango_context_set_base_dir ()), is specified explicitly rather than gotten from the Context.

Since: 1.4

log2visGetEmbeddingLevels

log2visGetEmbeddingLevels Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Text

text: the text to itemize.

-> Int32

length: the number of bytes (not characters) to process, or -1 if text is nul-terminated and the length should be calculated.

-> Direction

pbaseDir: input base direction, and output resolved direction.

-> m Word8

Returns: a newly allocated array of embedding levels, one item per character (not byte), that should be freed using g_free.

This will return the bidirectional embedding levels of the input paragraph as defined by the Unicode Bidirectional Algorithm available at:

http://www.unicode.org/reports/tr9/

If the input base direction is a weak direction, the direction of the characters in the text will determine the final resolved direction.

Since: 1.4

lookupAliases

lookupAliases Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Text

fontname: an ascii string

-> m [Text] 

Deprecated: (Since version 1.32)This function is not thread-safe.

Look up all user defined aliases for the alias fontname. The resulting font family names will be stored in families, and the number of families in nFamilies.

markupParserFinish

markupParserFinish Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> MarkupParseContext

context: A valid parse context that was returned from markupParserNew

-> m (AttrList, Text, Char)

(Can throw GError)

After feeding a pango markup parser some data with markupParseContextParse, use this function to get the list of pango attributes and text out of the markup. This function will not free context, use markupParseContextFree to do so.

Since: 1.31.0

markupParserNew

markupParserNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Char

accelMarker: character that precedes an accelerator, or 0 for none

-> m MarkupParseContext

Returns: a MarkupParseContext that should be destroyed with markupParseContextFree.

Parses marked-up text (see <link linkend="PangoMarkupFormat">markup format</link>) to create a plain-text string and an attribute list.

If accelMarker is nonzero, the given character will mark the character following it as an accelerator. For example, accelMarker might be an ampersand or underscore. All characters marked as an accelerator will receive a UnderlineLow attribute, and the first character so marked will be returned in accelChar, when calling finish(). Two accelMarker characters following each other produce a single literal accelMarker character.

To feed markup to the parser, use markupParseContextParse on the returned MarkupParseContext. When done with feeding markup to the parser, use markupParserFinish to get the data out of it, and then use markupParseContextFree to free it.

This function is designed for applications that read pango markup from streams. To simply parse a string containing pango markup, the simpler parseMarkup API is recommended instead.

Since: 1.31.0

moduleRegister

moduleRegister Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> IncludedModule

module: a IncludedModule

-> m () 

Deprecated: (Since version 1.38)

Do not use. Does not do anything.

parseEnum

parseEnum Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> GType

type: enum type to parse, eg. PANGO_TYPE_ELLIPSIZE_MODE.

-> Maybe Text

str: string to parse. May be Nothing.

-> Bool

warn: if True, issue a g_warning() on bad input.

-> m (Bool, Int32, Text)

Returns: True if str was successfully parsed.

Deprecated: (Since version 1.38)

Parses an enum type and stores the result in value.

If str does not match the nick name of any of the possible values for the enum and is not an integer, False is returned, a warning is issued if warn is True, and a string representing the list of possible values is stored in possibleValues. The list is slash-separated, eg. "none/start/middle/end". If failed and possibleValues is not Nothing, returned string should be freed using free.

Since: 1.16

parseMarkup

parseMarkup Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Text

markupText: markup to parse (see <link linkend="PangoMarkupFormat">markup format</link>)

-> Int32

length: length of markupText, or -1 if nul-terminated

-> Char

accelMarker: character that precedes an accelerator, or 0 for none

-> m (AttrList, Text, Char)

(Can throw GError)

Parses marked-up text (see <link linkend="PangoMarkupFormat">markup format</link>) to create a plain-text string and an attribute list.

If accelMarker is nonzero, the given character will mark the character following it as an accelerator. For example, accelMarker might be an ampersand or underscore. All characters marked as an accelerator will receive a UnderlineLow attribute, and the first character so marked will be returned in accelChar. Two accelMarker characters following each other produce a single literal accelMarker character.

To parse a stream of pango markup incrementally, use markupParserNew.

If any error happens, none of the output arguments are touched except for error.

quantizeLineGeometry

quantizeLineGeometry Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Int32

thickness: pointer to the thickness of a line, in Pango units

-> Int32

position: corresponding position

-> m (Int32, Int32) 

Quantizes the thickness and position of a line, typically an underline or strikethrough, to whole device pixels, that is integer multiples of SCALE. The purpose of this function is to avoid such lines looking blurry.

Care is taken to make sure thickness is at least one pixel when this function returns, but returned position may become zero as a result of rounding.

Since: 1.12

readLine

readLine Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Ptr ()

stream: a stdio stream

-> m (Int32, String)

Returns: 0 if the stream was already at an EOF character, otherwise the number of lines read (this is useful for maintaining a line number counter which doesn't combine lines with '\')

Deprecated: (Since version 1.38)

Reads an entire line from a file into a buffer. Lines may be delimited with '\n', '\r', '\n\r', or '\r\n'. The delimiter is not written into the buffer. Text after a '#' character is treated as a comment and skipped. '\' can be used to escape a # character. '\' proceeding a line delimiter combines adjacent lines. A '\' proceeding any other character is ignored and written into the output buffer unmodified.

reorderItems

reorderItems Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> [Item]

logicalItems: a List of Item in logical order.

-> m [Item]

Returns: a List of Item structures in visual order.

(Please open a bug if you use this function. It is not a particularly convenient interface, and the code is duplicated elsewhere in Pango for that reason.)

From a list of items in logical order and the associated directional levels, produce a list in visual order. The original list is unmodified.

scanInt

scanInt Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Text

pos: in/out string position

-> m (Bool, Text, Int32)

Returns: False if a parse error occurred.

Deprecated: (Since version 1.38)

Scans an integer. Leading white space is skipped.

scanString

scanString Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Text

pos: in/out string position

-> m (Bool, Text, String)

Returns: False if a parse error occurred.

Deprecated: (Since version 1.38)

Scans a string into a String buffer. The string may either be a sequence of non-white-space characters, or a quoted string with '"'. Instead a quoted string, '\"' represents a literal quote. Leading white space outside of quotes is skipped.

scanWord

scanWord Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Text

pos: in/out string position

-> m (Bool, Text, String)

Returns: False if a parse error occurred.

Deprecated: (Since version 1.38)

Scans a word into a String buffer. A word consists of [A-Za-z_] followed by zero or more [A-Za-z_0-9] Leading white space is skipped.

shape

shape Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Text

text: the text to process

-> Int32

length: the length (in bytes) of text

-> Analysis

analysis: Analysis structure from itemize

-> GlyphString

glyphs: glyph string in which to store results

-> m () 

Given a segment of text and the corresponding Analysis structure returned from itemize, convert the characters into glyphs. You may also pass in only a substring of the item from itemize.

It is recommended that you use shapeFull instead, since that API allows for shaping interaction happening across text item boundaries.

shapeFull

shapeFull Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Text

itemText: valid UTF-8 text to shape.

-> Int32

itemLength: the length (in bytes) of itemText. -1 means nul-terminated text.

-> Maybe Text

paragraphText: text of the paragraph (see details). May be Nothing.

-> Int32

paragraphLength: the length (in bytes) of paragraphText. -1 means nul-terminated text.

-> Analysis

analysis: Analysis structure from itemize.

-> GlyphString

glyphs: glyph string in which to store results.

-> m () 

Given a segment of text and the corresponding Analysis structure returned from itemize, convert the characters into glyphs. You may also pass in only a substring of the item from itemize.

This is similar to shape, except it also can optionally take the full paragraph text as input, which will then be used to perform certain cross-item shaping interactions. If you have access to the broader text of which itemText is part of, provide the broader text as paragraphText. If paragraphText is Nothing, item text is used instead.

Since: 1.32

skipSpace

skipSpace Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Text

pos: in/out string position

-> m (Bool, Text)

Returns: False if skipping the white space leaves the position at a '\0' character.

Deprecated: (Since version 1.38)

Skips 0 or more characters of white space.

splitFileList

splitFileList Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Text

str: a SEARCHPATH_SEPARATOR separated list of filenames

-> m [Text]

Returns: a list of strings to be freed with strfreev

Deprecated: (Since version 1.38)

Splits a SEARCHPATH_SEPARATOR-separated list of files, stripping white space and substituting ~/ with $HOME/.

trimString

trimString Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Text

str: a string

-> m Text

Returns: A newly-allocated string that must be freed with free

Deprecated: (Since version 1.38)

Trims leading and trailing whitespace from a string.

unicharDirection

unicharDirection Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Char

ch: a Unicode character

-> m Direction

Returns: the direction of the character.

Determines the inherent direction of a character; either DirectionLtr, DirectionRtl, or DirectionNeutral.

This function is useful to categorize characters into left-to-right letters, right-to-left letters, and everything else. If full Unicode bidirectional type of a character is needed, bidiTypeForUnichar can be used instead.

unitsFromDouble

unitsFromDouble Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Double

d: double floating-point value

-> m Int32

Returns: the value in Pango units.

Converts a floating-point number to Pango units: multiplies it by SCALE and rounds to nearest integer.

Since: 1.16

unitsToDouble

unitsToDouble Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Int32

i: value in Pango units

-> m Double

Returns: the double value.

Converts a number in Pango units to floating-point: divides it by SCALE.

Since: 1.16

version

version Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> m Int32

Returns: The encoded version of Pango library available at run time.

This is similar to the macro PANGO_VERSION except that it returns the encoded version of Pango available at run-time, as opposed to the version available at compile-time.

A version number can be encoded into an integer using PANGO_VERSION_ENCODE().

Since: 1.16

versionCheck

versionCheck Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> Int32

requiredMajor: the required major version.

-> Int32

requiredMinor: the required minor version.

-> Int32

requiredMicro: the required major version.

-> m (Maybe Text)

Returns: Nothing if the Pango library is compatible with the given version, or a string describing the version mismatch. The returned string is owned by Pango and should not be modified or freed.

Checks that the Pango library in use is compatible with the given version. Generally you would pass in the constants PANGO_VERSION_MAJOR, PANGO_VERSION_MINOR, PANGO_VERSION_MICRO as the three arguments to this function; that produces a check that the library in use at run-time is compatible with the version of Pango the application or module was compiled against.

Compatibility is defined by two things: first the version of the running library is newer than the version requiredMajor.required_minor.requiredMicro. Second the running library must be binary compatible with the version requiredMajor.required_minor.requiredMicro (same major version.)

For compile-time version checking use PANGO_VERSION_CHECK().

Since: 1.16

versionString

versionString Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> m Text

Returns: A string containing the version of Pango library available at run time. The returned string is owned by Pango and should not be modified or freed.

This is similar to the macro PANGO_VERSION_STRING except that it returns the version of Pango available at run-time, as opposed to the version available at compile-time.

Since: 1.16