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157c6a3f0c
Correct docs for some DeskTop icon APIs, and improve resilience of some of the APIs to having atypical grafports selected when called.
28 lines
1022 B
Markdown
28 lines
1022 B
Markdown
# Preview
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These files are a special class of Desk Accessory which reside in
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the `PREVIEW` subdirectory relative to `DESKTOP2` (next to `DESK.ACC`).
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These DAs will be invoked automatically for certain file types when
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File > Open is run or the files are double-clicked.
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* [show.text.file](show.text.file.s)
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* Handles text files (TXT $04)
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* [show.image.file](show.image.file.s)
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* Handles image files (FOT $08)
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* 8k Hires or 16k Double Hires images are supported
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* [show.font.file](show.font.file.s)
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* Handles MGTK font files (FNT $07)
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The files can optionally be copied into the `DESK.ACC` directory to
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allow direct invocation from the Apple menu. This can be useful to
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preview files of different file types e.g. image files saved as BIN
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$06.
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See [API.md](../desk.acc/API.md) for programming details.
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See the DA [README.md](../desk.acc/README.md) for build and installation
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details.
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NOTE: ProDOS file type FNT $07 is reserved for Apple /// SOS font
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files, but given their scarcity the type is re-used here.
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