File library¶
The file library allows to save the screen or a window on a file, and to load it back into the frame-buffer.
There are three options:
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The BMP file option saves and loads a BMP file to and from the SD-card.
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The portable pixmap file option saves and loads a portable pixmap file to and from the SD-card.
Everything is performed dynamically at run-time.
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The image on SD-card option saves a header file to the SD-card.
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The 16-bit image on SD-card option saves a header file to the SD-card.
The header file needs to be included into an application statically at build-time and displayed at the next run-time.
To summarise,
| Save to file | BMP | Image | 16-bit image | PBM |
|---|---|---|---|---|
| Screens | All | Fast | All | Fast |
| Screens | All | Monochrome | All | Monochrome |
| Save on | SD-card | SD-card | SD-card | SD-card |
| Save as | BMP | Header file | Header file | PBM file |
| Generated at | Run-time | Run-time | Run-time | Run-time |
| Read from | SD-card | Header file | Header file | SD-card |
| Included at | Run-time | Build-time | Build-time | Run-time |
The BMP file on SD-card and the 16-bit image header file on SD-card libraries manage all the screens, including colour screens.
The image header file on SD-card and the pixmap file on SD-card only manage monochrome screens.
Configure¶
Warning
The file operations on SD-card require the external SD library library.
Ensure the external SD-card library is installed and properly configured.
Use¶
Select one of the four options for the file library:
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Save and retrieve screen content as BMP files dynamically at run-time on an SD-card;
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Save screen content as images as header files dynamically at run-time on an SD-card to be included in an application statically at build-time;
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Save screen content as 16-bit images as header files dynamically at run-time on an SD-card to be included in an application statically at build-time;
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Save and retrieve screen content as portable pixmap files dynamically at run-time on an SD-card.