Rabbit OP7100 User Manual download pdf (Page 78)

OP710078

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 Graphics Programming

Font and Bitmap Conversion

Customers are encouraged to design their own fonts and bitmaps. These

restrictions must be followed.

• Save bitmaps as Windows bitmaps ( .bmp), not OS/2 bitmaps.

• The bitmap can only have two colors. Color 0 is the background, and

color 1 is the foreground. This is the reverse of most bitmap editors.

• Fonts must be bitmapped (not true type) and must be of fixed pitch.

• Save font files as .fnt (version 3).

The OP7100 uses a "vertical stripe" display logic format. The conversion

utility programs fntstrip.exe (landscape image) and fntcvtr.exe

(portrait image) convert the .fnt and .bmp file format to the Rabbit

Semiconductor vertical stripe format.

Follow these instructions to use these utilities.

1. Create the .fnt or .bmp file that conforms to the restrictions listed

above.

2. Start fntstrip or fntcvtr.

3. Specify the file to convert (select the file from the menu List files of

type

), and choose either .fnt or .bmp.

Entering *.fnt or *.bmp in the File name window will not

work. The file must be selected after clicking on Font files or

Bitmap files in the List files of type window.

4. Click the OK button or double-click on the file to convert. At this

point, the software asks the destination of the conversion. Specify a

file to store the result (text file) of the conversion. Click OK when the

file is specified.

5. The title bar displays "[inactive]" when the conversion is done. Close

the window.

Dynamic C may be used to edit the text file that was generated. The

generated file typically looks as follows.

/*Automatic output from Font Converter

font file is U:\TEST\DC5X\SAMPLES\QVGA\6X8.OUT.

dfVersion = 0x300

dfSize = 5148

dfType = 0x0

horizontal size is 6 pixels.

vertical size is 8 pixels.

first character is for code 0x20.

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Rabbit OP7100 User Manual Page 78