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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| [package] | ||
| name = "font-drawing" | ||
| version = "0.1.0" | ||
| edition = "2021" | ||
|
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||
| [dependencies] | ||
| machine-vision-formats.workspace = true | ||
| rusttype = "0.9.2" | ||
| eyre.workspace = true |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| use rusttype::{point, Scale}; | ||
| use machine_vision_formats::{pixel_format, ImageMutStride}; | ||
| use eyre::Result; | ||
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|
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| struct Rgba(pub [u8; 4]); | ||
|
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| fn put_pixel(image: &mut dyn ImageMutStride<pixel_format::RGB8>, x: u32, y: u32, incoming: Rgba) { | ||
| let row_start = image.stride() as usize * y as usize; | ||
| let pix_start = row_start + x as usize * 3; | ||
|
|
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| let alpha = incoming.0[3] as f64 / 255.0; | ||
| let p = 1.0 - alpha; | ||
| let q = alpha; | ||
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| let old: [u8; 3] = image.image_data()[pix_start..pix_start + 3] | ||
| .try_into() | ||
| .unwrap(); | ||
| let new: [u8; 3] = [ | ||
| (old[0] as f64 * p + incoming.0[0] as f64 * q).round() as u8, | ||
| (old[1] as f64 * p + incoming.0[1] as f64 * q).round() as u8, | ||
| (old[2] as f64 * p + incoming.0[2] as f64 * q).round() as u8, | ||
| ]; | ||
|
|
||
| image.buffer_mut_ref().data[pix_start] = new[0]; | ||
| image.buffer_mut_ref().data[pix_start + 1] = new[1]; | ||
| image.buffer_mut_ref().data[pix_start + 2] = new[2]; | ||
| } | ||
|
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| pub fn stamp_frame<'a>(image: &mut dyn ImageMutStride<pixel_format::RGB8>, font: &rusttype::Font<'a>, text: &str) -> Result<()> { | ||
| // from https://gitlab.redox-os.org/redox-os/rusttype/blob/master/dev/examples/image.rs | ||
|
|
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| // The font size to use | ||
| let scale = Scale::uniform(32.0); | ||
|
|
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| // Use a dark red colour | ||
| let colour = (150, 0, 0); | ||
|
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| let v_metrics = font.v_metrics(scale); | ||
|
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| let x0 = 20.0; | ||
| let y0 = 20.0; | ||
|
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| // layout the glyphs in a line with 20 pixels padding | ||
| let glyphs: Vec<_> = font | ||
| .layout(text, scale, point(x0, y0 + v_metrics.ascent)) | ||
| .collect(); | ||
|
|
||
| // Find the most visually pleasing width to display | ||
| let width = glyphs | ||
| .iter() | ||
| .rev() | ||
| .map(|g| g.position().x as f32 + g.unpositioned().h_metrics().advance_width) | ||
| .next() | ||
| .unwrap_or(0.0) | ||
| .ceil() as usize; | ||
|
|
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| let x_start = x0.floor() as usize; | ||
| let x_end = x_start + width; | ||
|
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| let y_start = y0.floor() as usize; | ||
| let y_end = y_start + v_metrics.ascent.ceil() as usize; | ||
|
|
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| for x in x_start..x_end { | ||
| for y in y_start..y_end { | ||
| put_pixel( | ||
| image, | ||
| // Offset the position by the glyph bounding box | ||
| x as u32, | ||
| y as u32, | ||
| // Turn the coverage into an alpha value | ||
| Rgba([255, 255, 255, 255]), | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| // TODO: clear background | ||
|
|
||
| for glyph in glyphs { | ||
| if let Some(bounding_box) = glyph.pixel_bounding_box() { | ||
| // Draw the glyph into the image per-pixel by using the draw closure | ||
| glyph.draw(|x, y, v| { | ||
| put_pixel( | ||
| image, | ||
| // Offset the position by the glyph bounding box | ||
| x + bounding_box.min.x as u32, | ||
| y + bounding_box.min.y as u32, | ||
| // Turn the coverage into an alpha value | ||
| Rgba([colour.0, colour.1, colour.2, (v * 255.0) as u8]), | ||
| ) | ||
| }); | ||
| } | ||
| } | ||
|
|
||
| Ok(()) | ||
| } |
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