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.TH LIBRIFUNKTIONSTECKENSNITTSGLYFRASTERISERINGSPROGRAMBIBLIOTEKET 7 LIBRIFUNKTIONSTECKENSNITTSGLYFRASTERISERINGSPROGRAMBIBLIOTEKET
.SH NAME
librifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket - Font rasterisation library
.SH DESCRIPTION
.B librifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket
is a C library for converting shape outlines to filled shapes,
with a focus on fonts, which that it only supports filled,
closed shapes and that the direction of the outline determines
whether a shape adds or subtracts to the image (the absolute
values of the result is used in the image). Furthermore this
means that the library only supports curve types that are used
for drawing glyphs; specifically this means that lines and
quadratic Bézier curves are supported by cause this is what is
required to draw vectorised bitmap fonts and TrueType fonts,
but also cubic Bézier curves as this is required for OpenType
fonts and elliptical arcs (elliptical rather than circular
because it may be need required to strech the circle to support
outputs with different vertical and horizontal dot density and
to support subpixel antialiasing) as this is commonly used for
corners when stroking the outline of a glyph.
.PP
The create an image, first create a buffer using
.BR rtgrpblib_create_raster (3)
(if you already have one that is large enough, you can
reinitialise it with
.BR rtgrpblib_reset_raster (3)),
and than using the drawing functions
.RB ( rtgrpblib_draw_linear_bezier (3),
.BR rtgrpblib_draw_quadratic_bezier (3),
.BR rtgrpblib_draw_cubic_bezier (3),
and
.BR rtgrpblib_draw_elliptical_arc (3))
to draw the components of each shape's outline. When done,
create an image using the
.BR rtgrpblib_fill_shapes (3)
function: you will receive a ink-level map, where the value
0 means background, and 1 means foreground, and values between
are colours between (no transfer function is applied).
.SH NOTES
Rifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket (hyphenation:
ri|funk¦tions-tec¦ken|snit¦ts-glyf-ras¦ter¦iser¦ings-prog¦ram|bib¦lio¦te¦ket)
is Swedish for \(dqthe library for rasterising glyphs from spline fonts\(dq.
.PP
Because of the length of the library name, and length limitation
on function names, the functions in this library are namespaced
with the prefix \(dqrtgrpblib_\(dq.
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