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© 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
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Tobias Kniep
