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diff --git a/librifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket.7 b/librifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket.7 new file mode 100644 index 0000000..a0fe3d0 --- /dev/null +++ b/librifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket.7 @@ -0,0 +1,48 @@ +.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. |