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b/src/image_wrapper.rs @@ -0,0 +1,42 @@ +use std::{ + fs::OpenOptions, + io::{BufWriter, Write}, + path::Path, +}; + +use image::{DynamicImage, GenericImage, ImageReader}; + +#[derive(Debug, Clone)] +pub struct BWImage { + pub width: u32, + pub height: u32, + pub data: Vec, +} + +pub fn load_bw_image>(p: P) -> BWImage { + let img = ImageReader::open(p).unwrap().decode().unwrap(); + match img { + DynamicImage::ImageRgba8(buf) => BWImage { + width: buf.width(), + height: buf.height(), + data: buf + .pixels() + .map(|px| ((px.0[0] as usize + px.0[1] as usize + px.0[2] as usize) / 3) as u8) + .collect(), + }, + DynamicImage::ImageRgb8(buf) => BWImage { + width: buf.width(), + height: buf.height(), + data: buf + .pixels() + .map(|px| ((px.0[0] as usize + px.0[1] as usize + px.0[2] as usize) / 3) as u8) + .collect(), + }, + DynamicImage::ImageLuma8(buf) => BWImage { + width: buf.width(), + height: buf.height(), + data: buf.into_raw(), + }, + _ => unreachable!(), + } +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..998752c --- /dev/null +++ b/src/main.rs @@ -0,0 +1,144 @@ +use std::collections::HashMap; +use std::path::Path; + +mod image_wrapper; +use image_wrapper::BWImage; +use sff::FileDescOut; +mod sff; + +/// Iterates over a directory which shall contain images named by their number in the font. +/// Asserts that all images have the same dimensions. +fn load_font_dir>(dir_with_images: P) -> HashMap { + let mut map = HashMap::new(); + let (mut found_width, mut found_height) = (None, None); + for elem in std::fs::read_dir(dir_with_images).unwrap() { + let elem = elem.unwrap(); + let img = image_wrapper::load_bw_image(elem.path()); + match (found_width, found_height) { + (None, None) => { + found_width = Some(img.width); + found_height = Some(img.height); + } + (Some(fw), Some(fh)) => { + assert!(img.width == fw); + assert!(img.height == fh); + } + _ => unreachable!(), + } + let number: u32 = elem + .path() + .file_stem() + .unwrap() + .to_str() + .unwrap() + .parse::() + .unwrap(); + assert!(!map.contains_key(&number)); + map.insert(number, img); + } + map +} + +fn image_table_split( + src_image: P, + dst_dir: Q, + start_number: usize, + nrows: usize, + ncols: usize, + width_per_elem: usize, + height_per_elem: usize, +) where + P: AsRef, + Q: AsRef, +{ + let src_img = image::ImageReader::open(src_image) + .unwrap() + .decode() + .unwrap(); + assert!(src_img.width() as usize == ncols * width_per_elem); + assert!(src_img.height() as usize == nrows * height_per_elem); + let mut number_count = start_number; + for row in 0..nrows { + for col in 0..ncols { + let img = src_img.crop_imm( + (col * width_per_elem) as u32, + (row * height_per_elem) as u32, + width_per_elem as u32, + height_per_elem as u32, + ); + let file_name = format!("{}.png", number_count); + img.save(dst_dir.as_ref().join(file_name)).unwrap(); + number_count += 1; + } + } +} + +#[derive(Debug, Copy, Clone, PartialEq, Eq)] +struct TableRange { + start: u32, + len: u32, +} + +fn sorted_numbers_into_ranges(sorted_numbers: &[u32]) -> Vec { + let mut curr_range = TableRange { + start: sorted_numbers[0], + len: 1, + }; + let mut out: Vec = Vec::new(); + for elem in &sorted_numbers[1..] { + if curr_range.start + curr_range.len == *elem { + curr_range.len += 1; + } else { + out.push(curr_range); + curr_range.start = *elem; + curr_range.len = 1; + } + } + out.push(curr_range); + out +} + +fn main() { + image_table_split("res/test.png", "font", 32, 6, 16, 8, 18); + let map = load_font_dir("font"); + let mut sorted_keys: Vec = map.keys().copied().collect(); + sorted_keys.sort(); + let ranges = sorted_numbers_into_ranges(&sorted_keys); + + let fdo = sff::FileDescOut { + char_width: 8, + char_height: 18, + encoding: sff::Encoding::BitPerPix4, + tables: ranges + .into_iter() + .map(|rng| sff::TableOut { + first_codepoint: rng.start, + num_codepoints: rng.len, + // TODO shitty clone + data: (rng.start..rng.start + rng.len) + .map(|codepoint| map.get(&codepoint).unwrap().data.clone()) + .collect(), + }) + .collect(), + }; + + std::fs::write("font.sff", fdo.encode()).unwrap(); +} + +#[cfg(test)] +mod test { + use super::*; + + #[test] + fn test_ranger() { + let numbers = [3, 4, 5, 6, 8]; + let ranges = sorted_numbers_into_ranges(&numbers); + assert_eq!( + ranges, + [ + TableRange { start: 3, len: 4 }, + TableRange { start: 8, len: 1 } + ] + ); + } +} diff --git a/src/sff.rs b/src/sff.rs new file mode 100644 index 0000000..2d04443 --- /dev/null +++ b/src/sff.rs @@ -0,0 +1,248 @@ +#[derive(Debug)] +struct Table { + first_codepoint: u32, + num_codepoints: u32, + offset: u32, +} + +#[derive(Debug, Copy, Clone, PartialEq, Eq)] +pub enum Encoding { + BitPerPix1, + BitPerPix2, + BitPerPix4, + BitPerPix8, +} + +struct Access { + byte_index: usize, + shift: u8, + mask: u8, +} + +impl Encoding { + fn into_code(self) -> u16 { + match self { + Encoding::BitPerPix1 => 0, + Encoding::BitPerPix2 => 1, + Encoding::BitPerPix4 => 2, + Encoding::BitPerPix8 => 3, + } + } + + fn access_from_index(self, px_index: usize) -> Access { + match self { + Encoding::BitPerPix1 => Access { + byte_index: px_index / 8, + shift: (7 - (px_index % 8)) as u8, + mask: 0x01, + }, + Encoding::BitPerPix2 => Access { + byte_index: px_index / 4, + shift: ((3 - (px_index % 4)) << 1) as u8, + mask: 0x03, + }, + Encoding::BitPerPix4 => Access { + byte_index: px_index / 2, + shift: ((1 - (px_index % 2)) << 2) as u8, + mask: 0x0f, + }, + Encoding::BitPerPix8 => Access { + byte_index: px_index, + shift: 0, + mask: 0xff, + }, + } + } + + /// Compresses standard brightness data (0-255) into a suitable form for sff. + fn compress(self, input: &[u8]) -> Vec { + let mut out = Vec::new(); + match self { + Encoding::BitPerPix1 => todo!(), + Encoding::BitPerPix2 => todo!(), + Encoding::BitPerPix4 => { + assert!(input.len() % 2 == 0); // TODO not strictly necessary + for c in 0..input.len() / 2 { + let one = input[2 * c] >> 4; + let two = input[2 * c + 1] >> 4; + out.push((one << 4) | two); + } + } + Encoding::BitPerPix8 => Vec::extend_from_slice(&mut out, input), + } + out + } +} + +fn get_u16(input: &[u8], byte_offset: usize) -> u16 { + assert!(byte_offset % 2 == 0); + input[byte_offset] as u16 | (input[byte_offset + 1] as u16) << 8 +} + +fn get_u32(input: &[u8], byte_offset: usize) -> u32 { + assert!(byte_offset % 4 == 0); + input[byte_offset] as u32 + | (input[byte_offset + 1] as u32) << 8 + | (input[byte_offset + 2] as u32) << 16 + | (input[byte_offset + 3] as u32) << 24 +} + +#[derive(Debug)] +struct FileDesc<'a> { + input: &'a [u8], + char_width: usize, + char_height: usize, + encoding: Encoding, + tables: Vec, +} + +impl<'a> FileDesc<'a> { + fn bytes_per_codepoint(&self) -> usize { + let px_per_codepoint = self.char_width * self.char_height; + match self.encoding { + Encoding::BitPerPix1 => px_per_codepoint >> 3, + Encoding::BitPerPix2 => px_per_codepoint >> 2, + Encoding::BitPerPix4 => px_per_codepoint >> 1, + Encoding::BitPerPix8 => px_per_codepoint, + } + } + + fn find_codepoint(&self, codepoint: u32) -> Option<&[u8]> { + self.tables + .iter() + .find(|tab| { + tab.first_codepoint <= codepoint + && tab.first_codepoint + tab.num_codepoints > codepoint + }) + .map(|tab| { + let off = tab.offset as usize + + (codepoint - tab.first_codepoint) as usize * self.bytes_per_codepoint(); + &self.input[off..off + self.bytes_per_codepoint()] + }) + } + + // input should be result of find_codepoint here + fn get_pixel_value(&self, input: &[u8], row: u8, col: u8) -> Option { + if row as usize >= self.char_height || col as usize >= self.char_width { + return None; + } + let px_index = row as usize * self.char_width + col as usize; + let Access { + byte_index, + shift, + mask, + } = self.encoding.access_from_index(px_index); + Some((input[byte_index] >> shift) & mask) + } +} + +fn decode(input: &[u8]) -> FileDesc<'_> { + if input[0] != b's' || input[1] != b'f' || input[2] != b'f' || input[3] != b'\0' { + panic!("invalid header magic"); + } + if get_u32(input, 4) != 1 { + panic!("invalid version"); + } + let char_width = get_u16(input, 0x8) as usize; + let char_height = get_u16(input, 0xa) as usize; + let encoding = match get_u16(input, 0xc) { + 0 => Encoding::BitPerPix1, + 1 => Encoding::BitPerPix2, + 2 => Encoding::BitPerPix4, + 3 => Encoding::BitPerPix8, + _ => unreachable!(), + }; + let num_tables = get_u16(input, 0xe); + let mut tables = Vec::new(); + let mut coff = 0x10; + for _ in 0..num_tables { + let tab = Table { + first_codepoint: get_u32(input, coff), + num_codepoints: get_u32(input, coff + 4), + offset: get_u32(input, coff + 8), + }; + tables.push(tab); + coff += 3 * 4; + } + + FileDesc { + input, + char_width, + char_height, + encoding, + tables, + } +} + +/// data holds unencoded values, from 0 to 255. They are scaled down/rounded internally. +#[derive(Debug)] +pub struct TableOut { + pub first_codepoint: u32, + pub num_codepoints: u32, + pub data: Vec>, +} + +#[derive(Debug)] +pub struct FileDescOut { + pub char_width: usize, + pub char_height: usize, + pub encoding: Encoding, + pub tables: Vec, +} + +fn push_u16(v: &mut Vec, value: u16) { + v.push((value & 0xff) as u8); + v.push(((value >> 8) & 0xff) as u8); +} + +fn push_u32(v: &mut Vec, value: u32) { + v.push((value & 0xff) as u8); + v.push(((value >> 8) & 0xff) as u8); + v.push(((value >> 16) & 0xff) as u8); + v.push(((value >> 24) & 0xff) as u8); +} + +fn put_u16(output: &mut [u8], byte_offset: usize, value: u16) { + assert!(byte_offset % 2 == 0); + output[byte_offset] = (value & 0xff) as u8; + output[byte_offset + 1] = ((value >> 8) & 0xff) as u8; +} + +fn put_u32(output: &mut [u8], byte_offset: usize, value: u32) { + assert!(byte_offset % 4 == 0); + output[byte_offset] = (value & 0xff) as u8; + output[byte_offset + 1] = ((value >> 8) & 0xff) as u8; + output[byte_offset + 2] = ((value >> 16) & 0xff) as u8; + output[byte_offset + 3] = ((value >> 24) & 0xff) as u8; +} + +impl FileDescOut { + pub fn encode(&self) -> Vec { + let mut v = vec![b's', b'f', b'f', b'\0']; + push_u32(&mut v, 1); + assert!(self.char_width < 1 << 16); + assert!(self.char_height < 1 << 16); + push_u16(&mut v, self.char_width as u16); + push_u16(&mut v, self.char_height as u16); + push_u16(&mut v, self.encoding.into_code()); + push_u16(&mut v, self.tables.len().try_into().unwrap()); + for _ in 0..self.tables.len() { + // first, reserve space for the table headers + push_u32(&mut v, 0); + push_u32(&mut v, 0); + push_u32(&mut v, 0); + } + for (i, table) in self.tables.iter().enumerate() { + let header_off = 0x10 + i * 3 * 4; + put_u32(&mut v[..], header_off, table.first_codepoint); + put_u32(&mut v[..], header_off + 4, table.num_codepoints); + let curr_len = v.len() as u32; + put_u32(&mut v[..], header_off + 8, curr_len); + for glyph_data in table.data.iter() { + // TODO ugly clone + v.extend_from_slice(&self.encoding.compress(glyph_data)[..]); + } + } + v + } +}