okk.moe
🖨️ esc/pos implementation in gleam
chore: remove accidental public function and add docs
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src/escpos.gleam
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src/escpos.gleam
···
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}
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/// Sets text size multiplier (1-8 for width and height).
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pub fn text_size(
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cb: CommandBuffer,
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width: Int,
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height: Int,
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) -> CommandBuffer {
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pub fn text_size(cb: CommandBuffer, width: Int, height: Int) -> CommandBuffer {
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append(cb, protocol.character_size(width, height))
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}
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src/escpos/document.gleam
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src/escpos/document.gleam
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src/escpos/image.gleam
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src/escpos/image.gleam
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//// There are printers that can print grayscale or even color, if
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//// you want to do that, you'll need to implement that yourself
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//// and/or leverage the `protocol` module directly.
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////
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//// 80mm printers usually have a maximum of 640 dots width.
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//// There is no validation so please check your image beforehand.
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////
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//// 80mm printers usually have a maximum around 600 dots width.
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//// There is no validation so please check your image width beforehand.
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////
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//// Images need to be supplied in PBM or PGM format. You can use tools like
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//// Imagemagick to convert your image. `magick img.png img.pgm`
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////
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//// ## Example
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////
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//// ```gleam
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//// import escpos/document
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//// import escpos/image
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//// import simplifile
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////
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//// // PBM images are already monochrome — just parse and print
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//// let assert Ok(pbm) = simplifile.read_bits(from: "./logo.pbm")
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//// let assert Ok(img) = image.from_pbm(pbm)
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////
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//// document.render([document.image(img), document.cut()])
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////
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//// // PGM images are grayscale and need dithering first
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//// let assert Ok(pgm) = simplifile.read_bits(from: "./photo.pgm")
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//// let assert Ok(img) = image.from_pgm(pgm)
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//// let img = image.dither_ign(img)
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////
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//// document.render([document.image(img), document.cut()])
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//// ```
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////
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//// Thank you jak for the pgm reading and bayer dithering 💕
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···
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dither_bayer(image, bias, bayer_4x4_matrix)
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}
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pub fn bayer_2x2_matrix(row: Int, column: Int) -> Int {
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fn bayer_2x2_matrix(row: Int, column: Int) -> Int {
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case row % 2 + 1, column % 2 + 1 {
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1, 1 -> 0
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1, 2 -> 127
···
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}
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}
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pub fn bayer_4x4_matrix(row: Int, column: Int) -> Int {
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fn bayer_4x4_matrix(row: Int, column: Int) -> Int {
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case row % 4 + 1, column % 4 + 1 {
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1, 1 -> 0
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1, 2 -> 127