fast image operations
Diffstat (limited to 'src/drawing/text.rs')
| -rw-r--r-- | src/drawing/text.rs | 73 |
1 files changed, 19 insertions, 54 deletions
diff --git a/src/drawing/text.rs b/src/drawing/text.rs index 3a8502f..3ff0b8d 100644 --- a/src/drawing/text.rs +++ b/src/drawing/text.rs @@ -1,26 +1,29 @@ //! text raster -use crate::Image; +use crate::{ + pixels::{float, Wam}, + Image, +}; use fontdue::{layout::TextStyle, Font}; -use umath::FFloat; +use umath::{generic_float::Constructors, FF32}; -impl<T: AsMut<[u8]> + AsRef<[u8]>> Image<T, 4> { +impl<const N: usize, T: AsMut<[u8]> + AsRef<[u8]>> Image<T, N> { /// Draw text. /// /// ``` /// # use fimg::Image; /// let font = fontdue::Font::from_bytes( - /// &include_bytes!("../../tdata/CascadiaCode.ttf")[..], - /// fontdue::FontSettings { - /// scale: 200.0, - /// ..Default::default() - /// }, + /// &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")); + /// # 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]) { + pub fn text(&mut self, x: u32, y: u32, size: f32, font: &Font, text: &str, color: [u8; N]) { let mut lay = fontdue::layout::Layout::new(fontdue::layout::CoordinateSystem::PositiveYDown); lay.append(&[font], &TextStyle::new(text, size, 0)); @@ -28,10 +31,6 @@ impl<T: AsMut<[u8]> + AsRef<[u8]>> Image<T, 4> { 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; @@ -40,49 +39,15 @@ impl<T: AsMut<[u8]> + AsRef<[u8]>> Image<T, 4> { if y >= self.height() { continue; } - // SAFETY: we clampin - let bg = unsafe { self.pixel_mut(x, y) }; - blend(bg.try_into().unwrap(), fg); + // SAFETY: the rasterizer kinda promises that metrics width and height are in bounds + let fill = unsafe { float(*bitmap.get_unchecked(j * metrics.width + i)) }; + // SAFETY: we clampin + let bg = unsafe { &mut *(self.pixel_mut(x, y).as_mut_ptr() as *mut [u8; N]) }; + // SAFETY: fill is 0..=1 + *bg = unsafe { bg.wam(color, FF32::one() - fill, fill) }; } } } } } - -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, - ] - } -} |