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software: remove a little bit of overhead from draw_image

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This commit is contained in:
Wez Furlong 2019-09-30 08:31:52 -07:00
parent b2212c3105
commit 29095f8560
1 changed files with 14 additions and 12 deletions
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26
window/src/bitmaps/mod.rs
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@ -284,7 +284,7 @@ pub trait BitmapImage {
let src_rect = src_rect
.unwrap_or_else(|| Rect::from_size(Size::new(im_width as isize, im_height as isize)));
let (dim_width, dim_height) = self.image_dimensions();
let (_dim_width, dim_height) = self.image_dimensions();
debug_assert!(
src_rect.size.width <= im_width as isize && src_rect.size.height <= im_height as isize
);
@ -296,17 +296,19 @@ pub trait BitmapImage {
if dest_y as usize >= dim_height {
break;
}
for x in src_rect.origin.x..src_rect.origin.x + src_rect.size.width {
let dest_x = x as isize + dest_top_left.x - src_rect.origin.x as isize;
if dest_x < 0 {
continue;
}
if dest_x as usize >= dim_width {
break;
}
let src = Color(*im.pixel(x as usize, y as usize));
let dst = self.pixel_mut(dest_x as usize, dest_y as usize);
*dst = src.composite(Color(*dst), &operator).0;
let src_pixels = im.horizontal_pixel_range(
src_rect.min_x() as usize,
src_rect.max_x() as usize,
y as usize,
);
let dest_pixels = self.horizontal_pixel_range_mut(
dest_top_left.x.max(0) as usize,
(dest_top_left.x + src_rect.size.width).max(0) as usize,
dest_y as usize,
);
for (src_pix, dest_pix) in src_pixels.iter().zip(dest_pixels.iter_mut()) {
*dest_pix = Color(*src_pix).composite(Color(*dest_pix), &operator).0;
}
}
}