fast image operations
draw text
| -rw-r--r-- | Cargo.toml | 8 | ||||
| -rw-r--r-- | README.md | 1 | ||||
| -rw-r--r-- | src/drawing/mod.rs | 6 | ||||
| -rw-r--r-- | src/drawing/text.rs | 88 | ||||
| -rw-r--r-- | tdata/CascadiaCode.ttf | bin | 0 -> 648732 bytes | |||
| -rw-r--r-- | tdata/text.imgbuf | bin | 0 -> 750000 bytes |
6 files changed, 99 insertions, 4 deletions
@@ -11,11 +11,12 @@ exclude = ["tdata", "benches/", ".gitignore"] [dependencies] mattr = "0.0.2" png = { version = "0.17", features = ["unstable"], optional = true } +fontdue = { version = "0.7.3", optional = true } vecto = "0.1.0" +umath = "0.0.7" [dev-dependencies] -iai = { version = "0.1.1", features = [ -], git = "https://github.com/bend-n/iai/" } +iai = { path = "../iai" } [[bench]] name = "overlays" @@ -39,7 +40,8 @@ harness = false [features] save = ["png"] -default = ["save"] +text = ["fontdue"] +default = ["save", "text"] [profile.release] debug = 2 @@ -16,3 +16,4 @@ quick simple image operations - [x] thick line drawing - [x] polygon drawing - [x] circle drawing +- [x] text drawing
\ No newline at end of file diff --git a/src/drawing/mod.rs b/src/drawing/mod.rs index ebc4e99..2196925 100644 --- a/src/drawing/mod.rs +++ b/src/drawing/mod.rs @@ -1,6 +1,10 @@ -//! contains drawing operations, like {line, box, triangle, polygon, circle} drawing +//! contains drawing operations, like +//! {line, box, triangle, polygon, circle, text} +//! drawing mod r#box; mod circle; mod line; mod poly; +#[cfg(feature = "text")] +mod text; mod tri; diff --git a/src/drawing/text.rs b/src/drawing/text.rs new file mode 100644 index 0000000..7c9cf27 --- /dev/null +++ b/src/drawing/text.rs @@ -0,0 +1,88 @@ +//! text raster + +use crate::Image; +use fontdue::{layout::TextStyle, Font}; +use umath::FFloat; + +impl<T: AsMut<[u8]> + AsRef<[u8]>> Image<T, 4> { + /// Draw text. + /// + /// ``` + /// # use fimg::Image; + /// let font = fontdue::Font::from_bytes( + /// &include_bytes!("../../tdata/CascadiaCode.ttf")[..], + /// fontdue::FontSettings { + /// scale: 200.0, + /// ..Default::default() + /// }, + /// ).unwrap(); + /// let mut i: Image<_, 4> = Image::alloc(750, 250).boxed(); + /// i.text(50, 10, 200.0, &font, "hello", [0, 0, 0, 255]); + /// assert_eq!(i.buffer(), include_bytes!("../../tdata/text.imgbuf")); + /// ``` + pub fn text(&mut self, x: u32, y: u32, size: f32, font: &Font, text: &str, color: [u8; 4]) { + let mut lay = + fontdue::layout::Layout::new(fontdue::layout::CoordinateSystem::PositiveYDown); + lay.append(&[font], &TextStyle::new(text, size, 0)); + for glpyh in lay.glyphs() { + let (metrics, bitmap) = font.rasterize(glpyh.parent, size); + for i in 0..metrics.width { + for j in 0..metrics.height { + // SAFETY: the rasterizer kinda promises that metrics width and height are in bounds + let fg = [color[0], color[1], color[2], unsafe { + *bitmap.get_unchecked(j * metrics.width + i) + }]; + let x = x + i as u32 + glpyh.x as u32; + if x >= self.width() { + continue; + } + let y = y + j as u32 + glpyh.y as u32; + if y >= self.height() { + continue; + } + // SAFETY: we clampin + let bg = unsafe { self.pixel_mut(x, y) }; + + blend(bg.try_into().unwrap(), fg); + } + } + } + } +} + +pub fn blend(bg: &mut [u8; 4], fg: [u8; 4]) { + if fg[3] == 0 { + return; + } + if fg[3] == 255 { + *bg = fg; + return; + } + #[allow(clippy::multiple_unsafe_ops_per_block)] + // SAFETY: no u8 can possibly become INF / NAN + unsafe { + let max = FFloat::new(255.0); + let bg_a = FFloat::new(bg[3] as f32) / max; + let fg_a = FFloat::new(fg[3] as f32) / max; + let a = bg_a + fg_a - bg_a * fg_a; + if a == 0.0 { + return; + }; + // could turn it into array::map + *bg = [ + *(max + * ((((FFloat::new(fg[0] as f32) / max) * fg_a) + + ((FFloat::new(bg[0] as f32) / max) * bg_a) * (FFloat::new(1.0) - fg_a)) + / a)) as u8, + *(max + * ((((FFloat::new(fg[1] as f32) / max) * fg_a) + + ((FFloat::new(bg[1] as f32) / max) * bg_a) * (FFloat::new(1.0) - fg_a)) + / a)) as u8, + *(max + * ((((FFloat::new(fg[2] as f32) / max) * fg_a) + + ((FFloat::new(bg[2] as f32) / max) * bg_a) * (FFloat::new(1.0) - fg_a)) + / a)) as u8, + *(max * a) as u8, + ] + } +} diff --git a/tdata/CascadiaCode.ttf b/tdata/CascadiaCode.ttf Binary files differnew file mode 100644 index 0000000..b47bf63 --- /dev/null +++ b/tdata/CascadiaCode.ttf diff --git a/tdata/text.imgbuf b/tdata/text.imgbuf Binary files differnew file mode 100644 index 0000000..fc5f8eb --- /dev/null +++ b/tdata/text.imgbuf |