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Measure width and decide on chunk height

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The chunk height was tested by printing a widget with height 1200 and
continuous vertical lines. It printed perfectly and in one go.
This commit is contained in:
Joscha 2024-03-09 01:26:17 +01:00
parent 2c8f9685b9
commit aff5b4974e
2 changed files with 17 additions and 11 deletions
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15
showbits-thermal-printer/src/printer.rs
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@ -23,13 +23,20 @@ impl Printer {
const PAGE_CODE: PageCode = PageCode::PC437;
/// Width of the printable area in pixels.
// TODO Figure out actual width
const WIDTH: u32 = 8 * 32;
///
/// Assumed to be a multiple of 8, then measured to that precision.
const WIDTH: u32 = 8 * 48;
/// Images are printed in chunks because a single print command can only
/// print so much data.
// TODO Figure out sensible chunk height
const CHUNK_HEIGHT: u32 = 42;
///
/// Looking at the [epson docs][0], most printers seem to support a max
/// height of 2303, though some go up to 4095. Because I don't want to waste
/// a bunch of paper trying various different heights, I'll go with 1023
/// because it's nice and round and slightly conservative.
///
/// [0]: https://download4.epson.biz/sec_pubs/pos/reference_en/escpos/gs_lv_0.html
const CHUNK_HEIGHT: u32 = 0b0000_0011_1111_1111;
pub fn new(
printer_path: Option<PathBuf>,