Package org.gnome.pango.cairo

Class PangoCairo

java.lang.Object

org.gnome.pango.cairo.PangoCairo

@Generated("io.github.jwharm.JavaGI")
public final class PangoCairo
extends Object

Constants and functions that are declared in the global PangoCairo namespace.

Constructor Summary

Constructors

Constructor	Description
PangoCairo()

Method Summary

Modifier and Type	Method	Description
static org.freedesktop.cairo.FontOptions	contextGetFontOptions(Context context)	Retrieves any font rendering options previously set with contextSetFontOptions(org.gnome.pango.Context, org.freedesktop.cairo.FontOptions).
static double	contextGetResolution(Context context)	Gets the resolution for the context.
static ShapeRendererFunc	contextGetShapeRenderer(Context context, @Nullable MemorySegment data)	Sets callback function for context to use for rendering attributes of type AttrType.SHAPE.
static void	contextSetFontOptions(Context context, @Nullable org.freedesktop.cairo.FontOptions options)	Sets the font options used when rendering text with this context.
static void	contextSetResolution(Context context, double dpi)	Sets the resolution for the context.
static void	contextSetShapeRenderer(Context context, @Nullable ShapeRendererFunc func)	Sets callback function for context to use for rendering attributes of type AttrType.SHAPE.
static Context	createContext(org.freedesktop.cairo.Context cr)	Creates a context object set up to match the current transformation and target surface of the Cairo context.
static Layout	createLayout(org.freedesktop.cairo.Context cr)	Creates a layout object set up to match the current transformation and target surface of the Cairo context.
static void	errorUnderlinePath(org.freedesktop.cairo.Context cr, double x, double y, double width, double height)	Add a squiggly line to the current path in the specified cairo context that approximately covers the given rectangle in the style of an underline used to indicate a spelling error.
static void	glyphStringPath(org.freedesktop.cairo.Context cr, Font font, GlyphString glyphs)	Adds the glyphs in glyphs to the current path in the specified cairo context.
static void	javagi$ensureInitialized()
static void	layoutLinePath(org.freedesktop.cairo.Context cr, LayoutLine line)	Adds the text in PangoLayoutLine to the current path in the specified cairo context.
static void	layoutPath(org.freedesktop.cairo.Context cr, Layout layout)	Adds the text in a PangoLayout to the current path in the specified cairo context.
static void	showErrorUnderline(org.freedesktop.cairo.Context cr, double x, double y, double width, double height)	Draw a squiggly line in the specified cairo context that approximately covers the given rectangle in the style of an underline used to indicate a spelling error.
static void	showGlyphItem(org.freedesktop.cairo.Context cr, String text, GlyphItem glyphItem)	Draws the glyphs in glyphItem in the specified cairo context,
static void	showGlyphString(org.freedesktop.cairo.Context cr, Font font, GlyphString glyphs)	Draws the glyphs in glyphs in the specified cairo context.
static void	showLayout(org.freedesktop.cairo.Context cr, Layout layout)	Draws a PangoLayout in the specified cairo context.
static void	showLayoutLine(org.freedesktop.cairo.Context cr, LayoutLine line)	Draws a PangoLayoutLine in the specified cairo context.
static void	updateContext(org.freedesktop.cairo.Context cr, Context context)	Updates a PangoContext previously created for use with Cairo to match the current transformation and target surface of a Cairo context.
static void	updateLayout(org.freedesktop.cairo.Context cr, Layout layout)	Updates the private PangoContext of a PangoLayout created with createLayout(org.freedesktop.cairo.Context) to match the current transformation and target surface of a Cairo context.

Methods inherited from class java.lang.Object

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

Constructor Details

PangoCairo

public PangoCairo()

Method Details

javagi$ensureInitialized

public static void javagi$ensureInitialized()

contextGetFontOptions

public static org.freedesktop.cairo.FontOptions contextGetFontOptions(Context context)

Retrieves any font rendering options previously set with contextSetFontOptions(org.gnome.pango.Context, org.freedesktop.cairo.FontOptions).

This function does not report options that are derived from the target surface by updateContext(org.freedesktop.cairo.Context, org.gnome.pango.Context).

Parameters:

context - a PangoContext, from a pangocairo font map

Returns:

the font options previously set on the context, or null if no options have been set. This value is owned by the context and must not be modified or freed.

contextGetResolution

public static double contextGetResolution(Context context)

Gets the resolution for the context.

See contextSetResolution(org.gnome.pango.Context, double)

Parameters:

context - a PangoContext, from a pangocairo font map

Returns:

the resolution in "dots per inch". A negative value will be returned if no resolution has previously been set.

contextGetShapeRenderer

public static ShapeRendererFunc contextGetShapeRenderer(Context context,
 @Nullable
 @Nullable MemorySegment data)

Sets callback function for context to use for rendering attributes of type AttrType.SHAPE.

See PangoCairoShapeRendererFunc for details.

Retrieves callback function and associated user data for rendering attributes of type AttrType.SHAPE as set by contextSetShapeRenderer(org.gnome.pango.Context, org.gnome.pango.cairo.ShapeRendererFunc), if any.

Parameters:

context - a PangoContext, from a pangocairo font map

data - Pointer to gpointer to return user data

Returns:

the shape rendering callback previously set on the context, or null if no shape rendering callback have been set.

contextSetFontOptions

public static void contextSetFontOptions(Context context,
 @Nullable
 @Nullable org.freedesktop.cairo.FontOptions options)

Sets the font options used when rendering text with this context.

These options override any options that updateContext(org.freedesktop.cairo.Context, org.gnome.pango.Context) derives from the target surface.

Parameters:

context - a PangoContext, from a pangocairo font map

options - a cairo_font_options_t, or null to unset any previously set options. A copy is made.

contextSetResolution

public static void contextSetResolution(Context context,
 double dpi)

Sets the resolution for the context.

This is a scale factor between points specified in a PangoFontDescription and Cairo units. The default value is 96, meaning that a 10 point font will be 13 units high. (10 * 96. / 72. = 13.3).

Parameters:

context - a PangoContext, from a pangocairo font map

dpi - the resolution in "dots per inch". (Physical inches aren't actually involved; the terminology is conventional.) A 0 or negative value means to use the resolution from the font map.

contextSetShapeRenderer

public static void contextSetShapeRenderer(Context context,
 @Nullable
 @Nullable ShapeRendererFunc func)

Sets callback function for context to use for rendering attributes of type AttrType.SHAPE.

See PangoCairoShapeRendererFunc for details.

Parameters:

context - a PangoContext, from a pangocairo font map

func - Callback function for rendering attributes of type AttrType.SHAPE, or null to disable shape rendering.

createContext

public static Context createContext(org.freedesktop.cairo.Context cr)

Creates a context object set up to match the current transformation and target surface of the Cairo context.

This context can then be used to create a layout using Layout(org.gnome.pango.Context).

This function is a convenience function that creates a context using the default font map, then updates it to cr. If you just need to create a layout for use with cr and do not need to access PangoContext directly, you can use createLayout(org.freedesktop.cairo.Context) instead.

Parameters:

cr - a Cairo context

Returns:

the newly created PangoContext

createLayout

public static Layout createLayout(org.freedesktop.cairo.Context cr)

Creates a layout object set up to match the current transformation and target surface of the Cairo context.

This layout can then be used for text measurement with functions like Layout.getSize(io.github.jwharm.javagi.base.Out<java.lang.Integer>, io.github.jwharm.javagi.base.Out<java.lang.Integer>) or drawing with functions like showLayout(org.freedesktop.cairo.Context, org.gnome.pango.Layout). If you change the transformation or target surface for cr, you need to call updateLayout(org.freedesktop.cairo.Context, org.gnome.pango.Layout).

This function is the most convenient way to use Cairo with Pango, however it is slightly inefficient since it creates a separate PangoContext object for each layout. This might matter in an application that was laying out large amounts of text.

Parameters:

cr - a Cairo context

Returns:

the newly created PangoLayout

errorUnderlinePath

public static void errorUnderlinePath(org.freedesktop.cairo.Context cr,
 double x,
 double y,
 double width,
 double height)

Add a squiggly line to the current path in the specified cairo context that approximately covers the given rectangle in the style of an underline used to indicate a spelling error.

The width of the underline is rounded to an integer number of up/down segments and the resulting rectangle is centered in the original rectangle.

Parameters:

cr - a Cairo context

x - The X coordinate of one corner of the rectangle

y - The Y coordinate of one corner of the rectangle

width - Non-negative width of the rectangle

height - Non-negative height of the rectangle

glyphStringPath

public static void glyphStringPath(org.freedesktop.cairo.Context cr,
 Font font,
 GlyphString glyphs)

Adds the glyphs in glyphs to the current path in the specified cairo context.

The origin of the glyphs (the left edge of the baseline) will be at the current point of the cairo context.

Parameters:

cr - a Cairo context

font - a PangoFont from a PangoCairoFontMap

glyphs - a PangoGlyphString

layoutLinePath

public static void layoutLinePath(org.freedesktop.cairo.Context cr,
 LayoutLine line)

Adds the text in PangoLayoutLine to the current path in the specified cairo context.

The origin of the glyphs (the left edge of the line) will be at the current point of the cairo context.

Parameters:

cr - a Cairo context

line - a PangoLayoutLine

layoutPath

public static void layoutPath(org.freedesktop.cairo.Context cr,
 Layout layout)

Adds the text in a PangoLayout to the current path in the specified cairo context.

The top-left corner of the PangoLayout will be at the current point of the cairo context.

Parameters:

cr - a Cairo context

layout - a Pango layout

showErrorUnderline

public static void showErrorUnderline(org.freedesktop.cairo.Context cr,
 double x,
 double y,
 double width,
 double height)

Draw a squiggly line in the specified cairo context that approximately covers the given rectangle in the style of an underline used to indicate a spelling error.

The width of the underline is rounded to an integer number of up/down segments and the resulting rectangle is centered in the original rectangle.

Parameters:

cr - a Cairo context

x - The X coordinate of one corner of the rectangle

y - The Y coordinate of one corner of the rectangle

width - Non-negative width of the rectangle

height - Non-negative height of the rectangle

showGlyphItem

public static void showGlyphItem(org.freedesktop.cairo.Context cr,
 String text,
 GlyphItem glyphItem)

Draws the glyphs in glyphItem in the specified cairo context,

embedding the text associated with the glyphs in the output if the output format supports it (PDF for example), otherwise it acts similar to showGlyphString(org.freedesktop.cairo.Context, org.gnome.pango.Font, org.gnome.pango.GlyphString).

The origin of the glyphs (the left edge of the baseline) will be drawn at the current point of the cairo context.

Note that text is the start of the text for layout, which is then indexed by glyph_item->item->offset.

Parameters:

cr - a Cairo context

text - the UTF-8 text that glyphItem refers to

glyphItem - a PangoGlyphItem

showGlyphString

public static void showGlyphString(org.freedesktop.cairo.Context cr,
 Font font,
 GlyphString glyphs)

Draws the glyphs in glyphs in the specified cairo context.

The origin of the glyphs (the left edge of the baseline) will be drawn at the current point of the cairo context.

Parameters:

cr - a Cairo context

font - a PangoFont from a PangoCairoFontMap

glyphs - a PangoGlyphString

showLayout

public static void showLayout(org.freedesktop.cairo.Context cr,
 Layout layout)

Draws a PangoLayout in the specified cairo context.

The top-left corner of the PangoLayout will be drawn at the current point of the cairo context.

Parameters:

cr - a Cairo context

layout - a Pango layout

showLayoutLine

public static void showLayoutLine(org.freedesktop.cairo.Context cr,
 LayoutLine line)

Draws a PangoLayoutLine in the specified cairo context.

The origin of the glyphs (the left edge of the line) will be drawn at the current point of the cairo context.

Parameters:

cr - a Cairo context

line - a PangoLayoutLine

updateContext

public static void updateContext(org.freedesktop.cairo.Context cr,
 Context context)

Updates a PangoContext previously created for use with Cairo to match the current transformation and target surface of a Cairo context.

If any layouts have been created for the context, it's necessary to call Layout.contextChanged() on those layouts.

Parameters:

cr - a Cairo context

context - a PangoContext, from a pangocairo font map

updateLayout

public static void updateLayout(org.freedesktop.cairo.Context cr,
 Layout layout)

Updates the private PangoContext of a PangoLayout created with createLayout(org.freedesktop.cairo.Context) to match the current transformation and target surface of a Cairo context.

Parameters:

cr - a Cairo context

layout - a PangoLayout, from createLayout(org.freedesktop.cairo.Context)