Open Label Library is an opensource, MIT licensed API specification for high performance label (glyphs, text, etc) rendering in 2D and 3D graphics environments. In addition there will be reference implementations for WebGL, Vulkan, and OpenGL.

Service	System	Compiler	Status
Travis-CI	Ubuntu 14.04	GCC 4.8, Clang 3.5
Travis-CI	OS X	Clang ?	upcoming
Coverity	Ubuntu 14.04	GCC 5.4
Jenkins	Ubuntu 14.04	GCC 4.8 GCC 4.9 GCC 5.4 Clang 3.8
Jenkins	Windows 10	MSVC 2013 Update 5 MSVC 2015 Update 1

This section introduces and partially extends common terminology from computer graphics and typography within the context of texture-based glyph rendering, as it is the basis of OpenLL and required for comprehending its API. Please note that these are not intended as general definitions but instead used to clarify their use within OpenLL.

Bitmask

A rectangular, high-resolution bitfield that approximates the shape of a grapheme by means of 'inside' and 'outside' bits.

Distance Map

A discrete, low-resolution scalar field that specifies the minimum distance to a shape's contour approximated by a bitmask. The distance may be signed to distinguish between the inside and outside of the shape.

Texture

A rectangular container storing data in a GPU friendly format for efficient processing.

Texture Atlas

A large, rectangular container comprising multiple textures that can be efficiently addressed as single texture.

For efficient label rendering OpenLL uses texture atlases of distance maps of graphemes. OpenLL further allows the computation of distance maps based on bitmasks at run-time.

Pixel

ToDo

Point

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Dots per Inch

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Screen Space

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World Space

ToDo also refer to Object Space here

Local Space

ToDo Typesetting Space

Grapheme

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Glyph

An elemental symbol intended to represent a readable character for the purposes of written communication. It is defined by a sub ... ToDo

Ligature

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Glyph Sequence

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Glyph Catalogue

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Font Face

A collection of glyph-based described by, e.g., font-size, line spacing, a glyph catalogue, as well as kerning information... ToDo

Kerning

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Base Line

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Advance

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Anchor

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Alignment

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...

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Typesetting

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Point

ToDo 2D and 3D

Line

ToDo 2D and 3D

Spline

ToDo 2D and 3D

Surface

ToDo 2D and 3D

Visibility

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Overlap

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Precedence

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Transformation

ToDo Additional glyph and glpyh sequence...

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Renderer

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Attributed Vertex Cloud

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Super Sampling

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Back-face Culling

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Texture Array

ToDo page...

Sub Texture

ToDo