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98 lines
3.0 KiB
98 lines
3.0 KiB
3 months ago
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use crate::ui::{
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display::Color,
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geometry::{Offset, Point, Rect},
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};
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#[cfg(feature = "ui_blurring")]
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use crate::ui::shape::DrawingCache;
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use super::{BasicCanvas, Bitmap, BitmapFormat, BitmapView, Canvas, Viewport};
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/// A struct representing 8-bit monochromatic canvas
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pub struct Mono8Canvas<'a> {
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bitmap: Bitmap<'a>,
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viewport: Viewport,
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}
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impl<'a> Mono8Canvas<'a> {
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/// Creates a new canvas with the specified size and buffer.
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///
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/// Optionally minimal height can be specified and then the height
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/// of the new bitmap is adjusted to the buffer size.
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///
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/// Returns None if the buffer is not big enough.
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pub fn new(size: Offset, min_height: Option<i16>, buff: &'a mut [u8]) -> Option<Self> {
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let bitmap = Bitmap::new_mut(BitmapFormat::MONO8, None, size, min_height, buff)?;
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let viewport = Viewport::from_size(bitmap.size());
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Some(Self { bitmap, viewport })
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}
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/// Returns the specified row as a mutable slice.
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///
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/// Returns None if row is out of range.
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pub fn row_mut(&mut self, row: i16) -> Option<&mut [u8]> {
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self.bitmap.row_mut(row)
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}
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}
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impl<'a> BasicCanvas for Mono8Canvas<'a> {
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fn viewport(&self) -> Viewport {
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self.viewport
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}
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fn set_viewport(&mut self, viewport: Viewport) {
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self.viewport = viewport.absolute_clip(self.bounds());
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}
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fn size(&self) -> Offset {
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self.bitmap.size()
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}
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fn fill_rect(&mut self, r: Rect, color: Color, alpha: u8) {
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let r = r.translate(self.viewport.origin);
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self.bitmap.mono8_fill(r, self.viewport.clip, color, alpha);
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}
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fn draw_bitmap(&mut self, r: Rect, bitmap: BitmapView) {
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let r = r.translate(self.viewport.origin);
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self.bitmap.mono8_copy(r, self.viewport.clip, &bitmap);
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}
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}
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impl<'a> Canvas for Mono8Canvas<'a> {
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fn view(&self) -> BitmapView {
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BitmapView::new(&self.bitmap)
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}
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fn draw_pixel(&mut self, pt: Point, color: Color) {
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let pt = pt + self.viewport.origin;
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if self.viewport.clip.contains(pt) {
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if let Some(row) = self.row_mut(pt.y) {
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row[pt.x as usize] = color.luminance() as u8;
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}
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}
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}
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fn blend_pixel(&mut self, pt: Point, color: Color, alpha: u8) {
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let pt = pt + self.viewport.origin;
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if self.viewport.clip.contains(pt) {
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if let Some(row) = self.row_mut(pt.y) {
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let pixel = &mut row[pt.x as usize];
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let fg_color = color.luminance() as u16;
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let bg_color = *pixel as u16;
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*pixel = ((fg_color * alpha as u16 + bg_color * (255 - alpha) as u16) / 255) as u8;
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}
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}
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}
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fn blend_bitmap(&mut self, r: Rect, src: BitmapView) {
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let r = r.translate(self.viewport.origin);
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self.bitmap.mono8_blend(r, self.viewport.clip, &src);
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}
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#[cfg(feature = "ui_blurring")]
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fn blur_rect(&mut self, _r: Rect, _radius: usize, _cache: &DrawingCache) {
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// Not implemented
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}
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}
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