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minimal text scale docs + reset on cls()

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Dennis Ranke
2024-04-10 00:03:54 +02:00
parent 285d9aee2c
commit d5ed809dc7
3 changed files with 12 additions and 3 deletions
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platform/bin/platform.uw8
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1
platform/src/platform.cwa
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@@ -62,6 +62,7 @@ export fn cls(col: i32) {
textCursorX = 0;
textCursorY = 0;
outputChannel = 0;
textScale = 1;
memory.fill(120, col, 320*240);
}

12
site/content/docs.md
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@@ -238,6 +238,13 @@ When printing characters only the foreground pixels are set, the background is "
Moving/printing past any border does not cause any special operation, the cursor just goes off-screen.
### Text scale
An integer text scale factor in the range 1x-16x can be set with control char 30. An attempt to
set a scale outside that range will reset the scale to 1x.
After startup and `cls` the scale is initialized to 1x.
### Control chars
Characters 0-31 are control characters and don't print by default. They take the next 0-2 following characters as parameters.
@@ -262,7 +269,8 @@ Avoid the reserved control chars, they are currently NOPs but their behavior can
| 15 | color | Set the text color |
| 16-23 | - | Reserved |
| 24 | - | Swap text/background colors |
| 25-30 | - | Reserved |
| 25-29 | - | Reserved |
| 30 | scale | Set text scale (1-16) |
| 31 | x, y | Set cursor position (*) |
(*) In graphics mode, the x coordinate is doubled when using control char 31 to be able to cover the whole screen with one byte.
@@ -271,7 +279,7 @@ Avoid the reserved control chars, they are currently NOPs but their behavior can
Control code 6 switches all text output (except codes 4 and 5 to switch output back to the screen) to the console. Where exactly this ends
up (if at all) is an implementation detail of the runtimes. The native dev-runtime writes the debug output to `stdout`, the web runtime to
the debug console using `console.log`. Both implementation buffer the output until they encounter a newline character (10) in the output stream.
the debug console using `console.log`. Both implementations buffer the output until they encounter a newline character (10) in the output stream.
There may be future runtimes that ignore the debug output completely.