pango-Glyph-Storage {RGtk2}R Documentation

Glyph Storage

Description

Structures for storing information about glyphs

Methods and Functions

pangoUnitsToDouble(i)
pangoUnitsFromDouble(d)
pangoExtentsToPixels(ink.rect, logical.rect)
pangoMatrixCopy(object)
pangoMatrixTranslate(object, tx, ty)
pangoMatrixScale(object, scale.x, scale.y)
pangoMatrixRotate(object, degrees)
pangoMatrixConcat(object, new.matrix)
pangoMatrixTransformPoint(object, x, y)
pangoMatrixTransformDistance(object, dx, dy)
pangoMatrixTransformRectangle(object, rect)
pangoMatrixTransformPixelRectangle(object, rect)
pangoMatrixGetFontScaleFactor(object)
pangoGlyphStringNew()
pangoGlyphStringCopy(object)
pangoGlyphStringSetSize(object, new.len)
pangoGlyphStringExtents(object, font)
pangoGlyphStringExtentsRange(object, start, end, font)
pangoGlyphStringGetWidth(object)
pangoGlyphStringIndexToX(object, text, analysis, index, trailing)
pangoGlyphStringXToIndex(object, text, analysis, x.pos)
pangoGlyphStringGetLogicalWidths(object, text, embedding.level)
pangoGlyphItemSplit(orig, text, split.index)
pangoGlyphItemApplyAttrs(glyph.item, text, list)
pangoGlyphItemLetterSpace(glyph.item, text, log.attrs)

Detailed Description

pangoShape produces a string of glyphs which can be measured or drawn to the screen. The following structures are used to store information about glyphs.

Structures

PangoRectangle
The PangoRectangle structure represents a rectangle. It is frequently used to represent the logical or ink extents of a single glyph or section of text. (See, for instance, pangoFontGetGlyphExtents) PangoRectangle is a transparent-type.

x
[integer] X coordinate of the left side of the rectangle.
y
[integer] Y coordinate of the the top side of the rectangle.
width
[integer] width of the rectangle.
height
[integer] height of the rectangle.

PangoMatrix
A structure specifying a transformation between user-space coordinates and device coordinates. The transformation is given by

x_device = x_user * matrix->xx + y_user * matrix->xy + matrix->x0;
y_device = x_user * matrix->yx + y_user * matrix->yy + matrix->y0;

Since 1.6

xx
[numeric] 1st component of the transformation matrix
xy
[numeric] 2nd component of the transformation matrix
yx
[numeric] 3rd component of the transformation matrix
yy
[numeric] 4th component of the transformation matrix
x0
[numeric] x translation
y0
[numeric] y translation

PangoGlyphInfo
The PangoGlyphInfo structure represents a single glyph together with positioning information and visual attributes. It contains the following fields.

glyph
[numeric] the glyph itself.
geometry
[PangoGlyphGeometry] the positional information about the glyph.
attr
[PangoGlyphVisAttr] the visual attributes of the glyph.

PangoGlyphGeometry
The PangoGlyphGeometry structure contains width and positioning information for a single glyph.

width
[integer] the logical width to use for the the character.
xOffset
[integer] horizontal offset from nominal character position.
yOffset
[integer] vertical offset from nominal character position.

PangoGlyphVisAttr
The PangoGlyphVisAttr is used to communicate information between the shaping phase and the rendering phase. More attributes may be added in the future.

isClusterStart
[numeric] set for the first logical glyph in each cluster. (Clusters are stored in visual order, within the cluster, glyphs are always ordered in logical order, since visual order is meaningless; that is, in Arabic text, accent glyphs follow the glyphs for the base character.)

PangoGlyphString
The PangoGlyphString structure is used to store strings of glyphs with geometry and visual attribute information. The storage for the glyph information is owned by the structure which simplifies memory management.

numGlyphs
[integer] the number of glyphs in the string.
glyphs
[PangoGlyphInfo] a list of PangoGlyphInfo structures of length num_glyphs.
logClusters
[integer] for each glyph, byte index of the starting character for the cluster. The indices are relative to the start of the text corresponding to the PangoGlyphString.

PangoGlyphItem
A PangoGlyphItem is a pair of a PangoItem and the glyphs resulting from shaping the text corresponding to an item. As an example of the usage of PangoGlyphItem, the results of shaping text with PangoLayout is a list of PangoLayoutLine, each of which contains a list of PangoGlyphItem.

item
[PangoItem] a PangoItem structure that provides information about a segment of text.
glyphs
[PangoGlyphString] the glyphs obtained by shaping the text corresponding to item.

Author(s)

Derived by RGtkGen from GTK+ documentation

References

http://developer.gnome.org/doc/API/2.0/pango/pango-Glyph-Storage.html


[Package RGtk2 version 2.12.5-3 Index]