readme.txt

游戏开发数据结构Data Structures for Game Programmers

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Data Structures For Game Programmers
Ron Penton
Graphical Demonstration 21-1
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This demonstration shows you how well RLE compression works on BMP files

- Enter the name of the bmp in the Filename Box
The included BMP's are:
    - a.bmp             - A small letter 'A', monochrome. Good compression.
    - aa.bmp            - A small anti-aliased letter 'A'. Slightly worse compression.
    - biga.bmp          - A big letter 'A', monochrome. Great Compression.
    - bigaa.bmp         - A big letter 'A', anti-aliased. Slightly worse compression.
    - blank.bmp         - A blank bitmap. Best Compression, ever.
    - marble.bmp        - A complex bitmap, awful compression.
    - stone.bmp         - A complex bitmap, awful compression.
    
- The Filesize box shows the size in bytes of the BMP file
- The RLE Size box shows the number of runs required to compress the file
- The byte size box shows the number of bytes required to store the RLE.

There are four length size options:
8 bit - Each run can store up to 255 values, and takes up 1 byte + color information.
16 bit - Each run can store up to 64k, values, and takes up 2 bytes + color information.
24 bit - Each run can store up to 16M values, and takes up 3 bytes + color information.
32 bit - Each run can store up to 4B values, and takes up 4 bytes + color information.