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use std::io::{Seek, SeekFrom, Write};
use binwrite::BinWrite;
use crate::{imagebytes::ImageAssemblyEntry, ImageBytes, WanError};
pub enum CompressionMethod {
CompressionMethodOriginal,
CompressionMethodOptimised {
multiple_of_value: usize,
min_transparent_to_compress: usize,
},
NoCompression,
}
impl CompressionMethod {
pub fn compress<F: Write + Seek>(
&self,
image: &ImageBytes,
pixel_list: &[u8],
file: &mut F,
) -> Result<Vec<ImageAssemblyEntry>, WanError> {
let mut assembly_table: Vec<ImageAssemblyEntry> = vec![];
match self {
Self::CompressionMethodOriginal => {
enum ActualEntry {
Null(u64, u32),
Some(u64, u64, u32),
}
impl ActualEntry {
fn new(is_all_black: bool, start_offset: u64, z_index: u32) -> ActualEntry {
if is_all_black {
ActualEntry::Null(64, z_index)
} else {
ActualEntry::Some(start_offset, 64, z_index)
}
}
fn to_assembly(&self) -> ImageAssemblyEntry {
match self {
ActualEntry::Null(lenght, z_index) => ImageAssemblyEntry {
pixel_src: 0,
pixel_amount: *lenght,
byte_amount: *lenght / 2,
_z_index: *z_index,
},
ActualEntry::Some(initial_offset, lenght, z_index) => {
ImageAssemblyEntry {
pixel_src: *initial_offset,
pixel_amount: *lenght,
byte_amount: *lenght / 2,
_z_index: *z_index,
}
}
}
}
fn advance(&self, lenght: u64) -> ActualEntry {
match self {
ActualEntry::Null(l, z) => ActualEntry::Null(*l + lenght, *z),
ActualEntry::Some(offset, l, z) => {
ActualEntry::Some(*offset, *l + lenght, *z)
}
}
}
}
let mut actual_entry: Option<ActualEntry> = None;
for (loop_nb, _chunk) in pixel_list.chunks_exact(64).enumerate() {
let mut this_area = vec![];
let mut is_all_black = true;
for l in 0..64 {
let actual_pixel = pixel_list[(loop_nb * 64 + l) as usize];
this_area.push(actual_pixel);
if actual_pixel != 0 {
is_all_black = false;
};
}
let pos_before_area = file.seek(SeekFrom::Current(0))?;
if !is_all_black {
for byte_id in 0..32 {
(((this_area[byte_id * 2] << 4) + this_area[byte_id * 2 + 1]) as u8)
.write(file)?;
}
}
let need_to_create_new_entry = match &actual_entry {
Some(ActualEntry::Null(_, _)) => !is_all_black,
Some(ActualEntry::Some(_, _, _)) => is_all_black,
None => true,
};
if need_to_create_new_entry {
if let Some(entry) = actual_entry {
assembly_table.push(entry.to_assembly())
}
actual_entry = Some(ActualEntry::new(
is_all_black,
pos_before_area,
image.z_index,
));
} else {
actual_entry = Some(actual_entry.unwrap().advance(64));
}
}
assembly_table.push(actual_entry.unwrap().to_assembly())
}
Self::CompressionMethodOptimised {
multiple_of_value,
min_transparent_to_compress,
} => {
let mut number_of_byte_to_include = 0;
let mut byte_include_start = file.seek(SeekFrom::Current(0))?;
let mut pixel_id = 0;
loop {
debug_assert!(pixel_id % 2 == 0);
let mut should_create_new_transparent_entry = false;
if (pixel_id % multiple_of_value == 0)
&& (pixel_id + min_transparent_to_compress < pixel_list.len())
{
let mut encontered_non_transparent = false;
for l in 0..*min_transparent_to_compress {
if pixel_list[pixel_id + l] != 0 {
encontered_non_transparent = true;
break;
};
}
if !encontered_non_transparent {
should_create_new_transparent_entry = true;
};
};
if should_create_new_transparent_entry {
if number_of_byte_to_include > 0 {
assembly_table.push(ImageAssemblyEntry {
pixel_src: byte_include_start,
pixel_amount: number_of_byte_to_include * 2,
byte_amount: number_of_byte_to_include,
_z_index: image.z_index,
});
number_of_byte_to_include = 0;
byte_include_start = file.seek(SeekFrom::Current(0))?;
};
let mut transparent_tile_nb = 0;
loop {
if pixel_id >= pixel_list.len() {
break;
};
if pixel_list[pixel_id] == 0 {
transparent_tile_nb += 1;
pixel_id += 1;
} else {
break;
};
}
if pixel_id % multiple_of_value != 0 {
transparent_tile_nb -= pixel_id % multiple_of_value;
pixel_id -= pixel_id % multiple_of_value;
};
assembly_table.push(ImageAssemblyEntry {
pixel_src: 0,
pixel_amount: transparent_tile_nb as u64,
byte_amount: (transparent_tile_nb as u64) / 2,
_z_index: image.z_index,
});
continue;
};
if pixel_id >= pixel_list.len() {
break;
};
debug_assert!(pixel_list[pixel_id] < 16);
debug_assert!(pixel_list[pixel_id + 1] < 16);
(((pixel_list[pixel_id] << 4) + pixel_list[pixel_id + 1]) as u8).write(file)?;
pixel_id += 2;
number_of_byte_to_include += 1;
}
if number_of_byte_to_include > 0 {
assembly_table.push(ImageAssemblyEntry {
pixel_src: byte_include_start,
pixel_amount: number_of_byte_to_include * 2,
byte_amount: number_of_byte_to_include,
_z_index: image.z_index,
});
};
}
Self::NoCompression => {
let mut byte_len = 0;
let start_offset = file.seek(SeekFrom::Current(0))?;
for pixels in pixel_list.chunks_exact(2) {
((pixels[0] << 4) + pixels[1]).write(file)?;
byte_len += 1;
}
assembly_table.push(ImageAssemblyEntry {
pixel_src: start_offset,
pixel_amount: byte_len * 2,
byte_amount: byte_len,
_z_index: image.z_index,
})
}
};
Ok(assembly_table)
}
}