gered/ggdt
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

add method for transparent blit with visible pixels all a single color

Browse source
This commit is contained in:
Gered 2022-05-23 14:47:37 -04:00
parent 2bb4365e08
commit 3ac0adea69
1 changed files with 35 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

36
libretrogd/src/graphics/bitmap/blit.rs
View file

@ -5,6 +5,7 @@ use crate::math::*;
pub enum BlitMethod {
Solid,
Transparent(u8),
TransparentSingle(u8, u8) // transparent color, single visible color
}
/// Clips the region for a source bitmap to be used in a subsequent blit operation. The source
@ -126,6 +127,36 @@ impl Bitmap {
}
}
pub unsafe fn transparent_single_color_blit(
&mut self,
src: &Bitmap,
src_region: &Rect,
dest_x: i32,
dest_y: i32,
transparent_color: u8,
single_color: u8,
) {
let src_next_row_inc = (src.width - src_region.width) as usize;
let dest_next_row_inc = (self.width - src_region.width) as usize;
let mut src_pixels = src.pixels_at_ptr_unchecked(src_region.x, src_region.y);
let mut dest_pixels = self.pixels_at_mut_ptr_unchecked(dest_x, dest_y);
for _ in 0..src_region.height {
for _ in 0..src_region.width {
let pixel = *src_pixels;
if pixel != transparent_color {
*dest_pixels = single_color;
}
src_pixels = src_pixels.add(1);
dest_pixels = dest_pixels.add(1);
}
src_pixels = src_pixels.add(src_next_row_inc);
dest_pixels = dest_pixels.add(dest_next_row_inc);
}
}
pub fn blit_region(
&mut self,
method: BlitMethod,
@ -163,7 +194,10 @@ impl Bitmap {
Solid => self.solid_blit(src, src_region, dest_x, dest_y),
Transparent(transparent_color) => {
self.transparent_blit(src, src_region, dest_x, dest_y, transparent_color)
}
},
TransparentSingle(transparent_color, single_color) => {
self.transparent_single_color_blit(src, src_region, dest_x, dest_y, transparent_color, single_color)
},
}
}