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simonowen / simcoupe

SAM Coupé emulator
GNU General Public License v2.0
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Add option to save screens #21

Closed stefandrissen closed 4 years ago

stefandrissen commented 4 years ago

spectrumcomputing.co.uk is now accepting SAM Coupé screen shots. Since they are for preservation an 'original data' format is requested, this seems to be a flat 24k for screen + 16 bytes for palette. No line interrupts or mode switching.

ASCD can export these files, but I am too used to SimCoupe to be able to use ASCD comfortably. Could this be added to SimCoupe?

The library used for processing images is https://github.com/moroz1999/zx-image

simonowen commented 4 years ago

It sounds pretty simple so I'll look at adding that in this week.

There were questions about the format for other screen modes, but using contiguous blocks of display data + palette should be good for all I think.

simonowen commented 4 years ago

Added in 270dd77915c501cff2c6743ec941d07e4c6ec7bd, which is part of this release. See ssxview.py for format details and a Python script to view the output files.

The MODE 4 output should match the existing SS4 files. I'm not sure if SS3 used a 4-entry or 16-entry CLUT, or whether SS1 and SS2 files existed at all.

The new files have unique sizes so I've used a new .ssx file extension to cover them all, plus any format differences. There's also a raw version of the file that supports raster-level effects, which is used if required. This is likely to require some changes in @moroz1999's library.