bendns' repos / mindus
mindustry logic execution, map- and schematic- parsing and rendering
Diffstat (limited to 'src/utils/image/overlay.rs')
-rw-r--r--src/utils/image/overlay.rs29
1 files changed, 18 insertions, 11 deletions
diff --git a/src/utils/image/overlay.rs b/src/utils/image/overlay.rs
index 3dba13b..95c9a0e 100644
--- a/src/utils/image/overlay.rs
+++ b/src/utils/image/overlay.rs
@@ -81,17 +81,24 @@ impl OverlayAt<Image<&[u8], 4>> for Image<&mut [u8], 3> {
impl OverlayAt<Image<&[u8], 3>> for Image<&mut [u8], 3> {
unsafe fn overlay_at(&mut self, with: &Image<&[u8], 3>, x: u32, y: u32) -> &mut Self {
- for j in 0..with.height() {
- let i_x = j as usize * with.width() as usize * 3
- ..(j as usize + 1) * with.width() as usize * 3;
- let o_x = ((j as usize + y as usize) * self.width() as usize + x as usize) * 3
- ..((j as usize + y as usize) * self.width() as usize
- + x as usize
- + with.width() as usize)
- * 3;
- let a = unsafe { self.buffer.get_unchecked_mut(o_x) };
- let b = unsafe { with.buffer.get_unchecked(i_x) };
- a.copy_from_slice(b);
+ macro_rules! o3x3 {
+ ($n:expr) => {{
+ for j in 0..($n as usize) {
+ let i_x = j * ($n as usize) * 3..(j + 1) * ($n as usize) * 3;
+ let o_x = ((j + y as usize) * self.width() as usize + x as usize) * 3
+ ..((j + y as usize) * self.width() as usize + x as usize + ($n as usize))
+ * 3;
+ let a = unsafe { self.buffer.get_unchecked_mut(o_x) };
+ let b = unsafe { with.buffer.get_unchecked(i_x) };
+ a.copy_from_slice(b);
+ }
+ }};
+ }
+ // let it unroll
+ match with.width() {
+ 8 => o3x3!(8),
+ 16 => o3x3!(16), // this branch makes 8x8 0.16 times slower; but 16x16 0.2 times faster.
+ _ => o3x3!(with.width()),
}
self
}