2018-01-05 00:49:00 +01:00
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The virtual terminal (vterm)
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----------------------------
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2015-05-23 13:35:12 +02:00
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2019-10-08 04:37:19 +02:00
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FINAL CUT uses a virtual terminal to print character via an update method
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on the screen. It provides (as an overlying layer) virtual windows for
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the realization of window movements. The update methods only transfer
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2019-10-01 23:14:00 +02:00
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differences to the virtual terminal or physical screen.
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2015-05-23 13:35:12 +02:00
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print(...)
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printf(...)
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│
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2019-10-08 04:37:19 +02:00
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│ ╔════════════════════════[ vterm ]════════════════════════╗
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│ ║createVTerm() ║
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│ ║ ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┐ ║
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│ ║ ║
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│ ║ │ restoreVTerm(x,y,w,h) │ ║
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│ ┌───────╨────[ vwin ]────────────┐ ║
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│ │createArea(area) │ └ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┘ ║
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│ │ │ ║
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│ │ │ ║
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└──┼────────► putArea(area) ────► ║
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│ │ ║
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│ putArea(x,y,area) ────► ║
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│ │ ║
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│ ◄──── getArea(x,y,area) ║
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│ │ ║
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│ │ ║
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│ │ ║
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│ resizeArea(area)│ ║
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└───────╥────────────────────────┘ ║
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║ ║
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║ │ resizeVTerm()║
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╚═══════▼═════════════════════════════════════════════════╝
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│
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│ putVTerm()
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└──────────────────► updateTerminalLine(y)
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updateTerminal() │
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▼
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┌───────────────┐
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│ output_buffer │
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└───────────────┘
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│
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│ flushOutputBuffer()
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│ and putchar(char)
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▼
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▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄
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▌ ▐
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▌ screen ▐
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▌ ───────────── ▐
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▌ real terminal ▐
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▌ ▐
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▀▀▀▀▀▀▀███▀▀▀▀▀▀▀
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███
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▀▀▀▀▀▀▀▀▀
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