© Zühlke 2014 Tobias Kniep Effective Internationalization for Embedded Systems 26. February 2014.

© Zühlke 2014

Tobias Kniep

Effective Internationalization for Embedded Systems

26. February 2014

SafetyUsability Acceptance

Shibuya Crossing, Tokyo by Terrazo, on Flickr. Creative Commons Attribution 2.0 Generic License

Coded Character Set“A mapping from a set of abstract characters to a set of integers.” Ken Lunde,

CJKV Information Processing

Unicode

ASCII128

JIS X 0213:2004 4354

Unicode BMP 65536

Unicode1114112

Number of characters

How to represent the chars?

ASCII

H e a l t h 0x48 0x65 0x61 0x6C 0x74 0x68

[0x48,0x65,0x61,0x6C,0x74,0x68]

Encoding Form

„A character encoding form plus byte serialization “

Glossary of theUnicode Consortium

„Mapping from a character set definition to the actual code units used to represent the data.”

Encoding Scheme

Unicode

健 康 0x5065 0x5EB7

UTF-16LE:[0x65,0x50,0xB7,0x5E]? UTF-8:[0xE5,0x81,0xA5,0xE5,0xBA,0xB7]

UTF-32BE:[0x00,0x00,0x50,0x65,0x00,0x00,0x5E,0xB7]

�康

Endianess

Little Endian

Big Endian [0x65,0x50,0xB7,0x5E]

[0x50,0x65,0x5E,0xB7]

健康(0x6550,0xB75E)

敐띞

UTF-8H 0x48¥ 0xC2,0xA5

健 0xE5,0x81,0xA5

𠀷 0xF0,0xA0,0x80,0xB7

0x48 010010000xC2 110000100xE5 111001010xF0 11110000

UTF-16H 0x0048¥ 0x00A5

健 0x5065

𠀷 0xD840,0xDC37

UTF-32H 0x00000048¥ 0x000000A5

健 0x00005065

𠀷 0x00020037

UTF-8

How to display chars?

Font“A collection of glyphs usedfor the visual depictionof character data.”

Glossary of theUnicode Consortium

Pixel-Matrix Here:

3 bits/pixel

No scaling

Easy todisplay

Predictable

output

Bitmap Font

Large

Outline FontLines, Arcs,

CurvesNeeds Renderer

Scaling

Output hard

to predict

Bitmap Font

Anti-aliasing

CharacterSet Encoding Font

Ken Lunde, CJKV Information ProcessingO’Reilly 2009

Question? Comments? Opinions?

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Tobias Kniep