Switch to a proc macro for generating the image data

agb-image-converter/Cargo.lock

@@ -13,6 +13,7 @@ name = "agb_image_converter"
 version = "0.4.0"
 dependencies = [
  "image",
+ "litrs",
  "serde",
  "toml",
  "typed-builder",
@@ -88,6 +89,15 @@ dependencies = [
  "png",
 ]
 
+[[package]]
+name = "litrs"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f9275e0933cf8bb20f008924c0cb07a0692fe54d8064996520bf998de9eb79aa"
+dependencies = [
+ "proc-macro2",
+]
+
 [[package]]
 name = "miniz_oxide"
 version = "0.3.7"

agb-image-converter/Cargo.toml

@@ -6,8 +6,12 @@ edition = "2018"
 license = "MPL-2.0"
 description = "Library for converting graphics for use on the Game Boy Advance"
 
+[lib]
+proc-macro = true
+
 [dependencies]
 image = { version = "0.23.14", default-features = false, features = [ "png", "bmp" ] }
 typed-builder = "0.9.0"
 toml = "0.5.8"
 serde = { version = "1.0", features = ["derive"] }
+litrs = "0.2.3"

agb-image-converter/src/bin/convert.rs

@@ -1,17 +0,0 @@
-use std::env;
-
-use agb_image_converter::{convert_image, ImageConverterConfig, TileSize};
-
-fn main() {
-    let args: Vec<_> = env::args().collect();
-
-    let file_path = &args[1];
-    let output_path = &args[2];
-    convert_image(
-        ImageConverterConfig::builder()
-            .tile_size(TileSize::Tile8)
-            .input_image(file_path.into())
-            .output_file(output_path.into())
-            .build(),
-    );
-}

agb-image-converter/src/config.rs

@@ -4,8 +4,8 @@ use std::fs;
 
 use crate::{TileSize, Colour};
 
-pub fn parse(filename: &str) -> Box<dyn Config> {
-    let config_toml = fs::read_to_string(filename).expect("Failed to read file");
+pub(crate) fn parse(filename: &str) -> Box<dyn Config> {
+    let config_toml = fs::read_to_string(filename).expect(&format!("Failed to read file {}", filename));
     
     let config: ConfigV1 = toml::from_str(&config_toml).expect("Failed to parse file");
 
@@ -16,12 +16,12 @@ pub fn parse(filename: &str) -> Box<dyn Config> {
     Box::new(config)
 }
 
-pub trait Config {
+pub(crate) trait Config {
     fn crate_prefix(&self) -> String;
     fn images(&self) -> HashMap<String, &dyn Image>;
 }
 
-pub trait Image {
+pub(crate) trait Image {
     fn filename(&self) -> String;
     fn transparent_colour(&self) -> Option<Colour>;
     fn tilesize(&self) -> TileSize;
@@ -85,12 +85,15 @@ impl Image for ImageV1 {
 pub enum TileSizeV1 {
     #[serde(rename = "8x8")]
     Tile8,
+    #[serde(rename = "16x16")]
+    Tile16,
 }
 
 impl Into<TileSize> for TileSizeV1 {
     fn into(self) -> TileSize {
         match self {
             TileSizeV1::Tile8 => TileSize::Tile8,
+            TileSizeV1::Tile16 => TileSize::Tile16,
         }
     }
 }

agb-image-converter/src/lib.rs

@@ -1,8 +1,9 @@
-use std::fs::File;
-use std::io::BufWriter;
-use std::path::PathBuf;
+use proc_macro::TokenStream;
+use litrs::StringLit;
 
-use typed_builder::TypedBuilder;
+use std::path::Path;
+use std::convert::TryFrom;
+use std::fmt::Write;
 
 mod colour;
 mod image_loader;
@@ -12,10 +13,10 @@ mod config;
 
 use image_loader::Image;
 
-pub use colour::Colour;
+use colour::Colour;
 
 #[derive(Debug, Clone, Copy)]
-pub enum TileSize {
+pub(crate) enum TileSize {
     Tile8,
     Tile16,
 }
@@ -29,41 +30,62 @@ impl TileSize {
     }
 }
 
-#[derive(TypedBuilder)]
-pub struct ImageConverterConfig {
-    #[builder(default, setter(strip_option))]
-    transparent_colour: Option<Colour>,
-    tile_size: TileSize,
-    input_image: PathBuf,
-    output_file: PathBuf,
+#[proc_macro]
+pub fn include_gfx(input: TokenStream) -> TokenStream {
+    let first_token = input.into_iter().next().expect("no input");
 
-    #[builder(default, setter(strip_option))]
-    crate_prefix: Option<String>,
+    let filename = match StringLit::try_from(first_token) {
+        Err(e) => return e.to_compile_error(),
+        Ok(filename) => filename.into_value(),
+    };
+
+    let root = std::env::var("CARGO_MANIFEST_DIR").expect("Failed to get cargo manifest dir");
+    let path = Path::new(&root).join(&*filename);
+    let parent = path.parent().expect("Expected a parent directory for the path");
+
+    let config = config::parse(&path.to_string_lossy());
+
+    let module_name = path.file_stem().expect("Expected a file stem");
+
+    let mut output = String::new();
+
+    writeln!(&mut output, "mod {} {{", module_name.to_string_lossy()).unwrap();
+    writeln!(&mut output, "const _: &[u8] = include_bytes!(\"{}\");", path.to_string_lossy()).unwrap();
+
+    for (image_name, image) in config.images() {
+        writeln!(&mut output, "{}", convert_image(image, parent, &image_name, &config.crate_prefix())).unwrap();
+    }
+
+    writeln!(&mut output, "}}").unwrap();
+
+    output.parse().expect("Failed to generate valid rust code")
 }
 
-pub fn convert_image(settings: ImageConverterConfig) {
-    let image = Image::load_from_file(&settings.input_image);
+fn convert_image(settings: &dyn config::Image, parent: &Path, variable_name: &str, crate_prefix: &str) -> String {
+    let image_filename = &parent.join(&settings.filename());
+    let image = Image::load_from_file(image_filename);
 
-    let tile_size = settings.tile_size.to_size();
+    let tile_size = settings.tilesize().to_size();
     if image.width % tile_size != 0 || image.height % tile_size != 0 {
         panic!("Image size not a multiple of tile size");
     }
 
     let optimiser = optimiser_for_image(&image, tile_size);
-    let optimisation_results = optimiser.optimise_palettes(settings.transparent_colour);
+    let optimisation_results = optimiser.optimise_palettes(settings.transparent_colour());
 
-    let output_file = File::create(&settings.output_file).expect("Failed to create file");
-    let mut writer = BufWriter::new(output_file);
+    let mut writer = String::new();
 
     rust_generator::generate_code(
         &mut writer,
-        "test",
+        variable_name,
         &optimisation_results,
         &image,
-        settings.tile_size,
-        settings.crate_prefix.unwrap_or("agb".to_owned()),
-    )
-    .expect("Failed to write data");
+        &image_filename.to_string_lossy(),
+        settings.tilesize(),
+        crate_prefix.to_owned(),
+    );
+
+    writer
 }
 
 fn optimiser_for_image(image: &Image, tile_size: usize) -> palette16::Palette16Optimiser {

agb-image-converter/src/rust_generator.rs

@@ -1,5 +1,4 @@
-use std::io;
-use std::io::Write;
+use std::fmt::Write;
 
 use crate::image_loader::Image;
 use crate::palette16::Palette16OptimisationResults;
@@ -10,40 +9,43 @@ pub(crate) fn generate_code(
     output_variable_name: &str,
     results: &Palette16OptimisationResults,
     image: &Image,
+    image_filename: &str,
     tile_size: TileSize,
     crate_prefix: String,
-) -> io::Result<()> {
-    writeln!(output, "#[allow(non_upper_case_globals)]")?;
-    writeln!(output, "pub const {}: {}::display::tile_data::TileData = {{", output_variable_name, crate_prefix)?;
+) {
+    writeln!(output, "#[allow(non_upper_case_globals)]").unwrap();
+    writeln!(output, "pub const {}: {}::display::tile_data::TileData = {{", output_variable_name, crate_prefix).unwrap();
+
+    writeln!(output, "const _: &[u8] = include_bytes!(\"{}\");", image_filename).unwrap();
 
     writeln!(
         output,
         "const PALETTE_DATA: &[{}::display::palette16::Palette16] = &[",
         crate_prefix,
-    )?;
+    ).unwrap();
 
     for palette in &results.optimised_palettes {
         write!(
             output,
             "    {}::display::palette16::Palette16::new([",
             crate_prefix
-        )?;
+        ).unwrap();
 
         for colour in palette.clone() {
-            write!(output, "0x{:08x}, ", colour.to_rgb15())?;
+            write!(output, "0x{:08x}, ", colour.to_rgb15()).unwrap();
         }
 
         for _ in palette.clone().into_iter().len()..16 {
-            write!(output, "0x00000000, ")?;
+            write!(output, "0x00000000, ").unwrap();
         }
 
-        writeln!(output, "]),")?;
+        writeln!(output, "]),").unwrap();
     }
 
-    writeln!(output, "];")?;
-    writeln!(output)?;
+    writeln!(output, "];").unwrap();
+    writeln!(output).unwrap();
 
-    writeln!(output, "const TILE_DATA: &[u32] = &[",)?;
+    writeln!(output, "const TILE_DATA: &[u32] = &[",).unwrap();
 
     let tile_size = tile_size.to_size();
 
@@ -58,46 +60,44 @@ pub(crate) fn generate_code(
                 output,
                 "    /* {}, {} (palette index {}) */",
                 x, y, palette_index
-            )?;
+            ).unwrap();
 
             for inner_y in 0..tile_size / 8 {
-                write!(output, "    ")?;
+                write!(output, "    ").unwrap();
 
                 for inner_x in 0..tile_size / 8 {
                     for j in inner_y * 8..inner_y * 8 + 8 {
-                        write!(output, "0x")?;
+                        write!(output, "0x").unwrap();
 
                         for i in (inner_x * 8..inner_x * 8 + 8).rev() {
                             let colour = image.colour(x * tile_size + i, y * tile_size + j);
                             let colour_index = palette.colour_index(colour);
 
-                            write!(output, "{:x}", colour_index)?;
+                            write!(output, "{:x}", colour_index).unwrap();
                         }
 
-                        write!(output, ", ")?;
+                        write!(output, ", ").unwrap();
                     }
                 }
             }
 
-            writeln!(output)?;
+            writeln!(output).unwrap();
         }
     }
 
-    writeln!(output, "];")?;
-    writeln!(output)?;
+    writeln!(output, "];").unwrap();
+    writeln!(output).unwrap();
 
-    write!(output, "const PALETTE_ASSIGNMENT: &[u8] = &[")?;
+    write!(output, "const PALETTE_ASSIGNMENT: &[u8] = &[").unwrap();
 
     for (i, assignment) in results.assignments.iter().enumerate() {
         if i % 16 == 0 {
-            write!(output, "\n    ")?;
+            write!(output, "\n    ").unwrap();
         }
-        write!(output, "{}, ", assignment)?;
+        write!(output, "{}, ", assignment).unwrap();
     }
 
-    writeln!(output, "\n];")?;
+    writeln!(output, "\n];").unwrap();
 
-    writeln!(output, "{}::display::tile_data::TileData::new(PALETTE_DATA, TILE_DATA, PALETTE_ASSIGNMENT)\n}};", crate_prefix)?;
-
-    Ok(())
+    writeln!(output, "{}::display::tile_data::TileData::new(PALETTE_DATA, TILE_DATA, PALETTE_ASSIGNMENT)\n}};", crate_prefix).unwrap();
 }

agb/Cargo.lock

@@ -21,6 +21,7 @@ name = "agb_image_converter"
 version = "0.4.0"
 dependencies = [
  "image",
+ "litrs",
  "serde",
  "toml",
  "typed-builder",
@@ -96,6 +97,15 @@ dependencies = [
  "png",
 ]
 
+[[package]]
+name = "litrs"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f9275e0933cf8bb20f008924c0cb07a0692fe54d8064996520bf998de9eb79aa"
+dependencies = [
+ "proc-macro2",
+]
+
 [[package]]
 name = "miniz_oxide"
 version = "0.3.7"

agb/Cargo.toml

@@ -18,8 +18,6 @@ lto = true
 
 [dependencies]
 bitflags = "1.2"
-
-[build-dependencies]
 agb_image_converter = { version = "0.4.0", path = "../agb-image-converter" }
 
 [package.metadata.docs.rs]

agb/build.rs

@@ -1,5 +1,3 @@
-use agb_image_converter::{convert_image, Colour, ImageConverterConfig, TileSize};
-
 fn main() {
     println!("cargo:rerun-if-changed=crt0.s");
     println!("cargo:rerun-if-changed=gba_mb.ld");
@@ -24,14 +22,4 @@ fn main() {
     }
 
     println!("cargo:rustc-link-search={}", out_dir);
-
-    convert_image(
-        ImageConverterConfig::builder()
-            .transparent_colour(Colour::from_rgb(1, 1, 1))
-            .tile_size(TileSize::Tile8)
-            .input_image("gfx/test_logo.png".into())
-            .output_file(format!("{}/test_logo.rs", out_dir).into())
-            .crate_prefix("crate".to_owned())
-            .build(),
-    );
 }

agb/examples/test_logo.rs

@@ -10,19 +10,7 @@ pub fn main() -> ! {
     let mut gba = agb::Gba::new();
     let mut gfx = gba.display.video.tiled0();
 
-    gfx.set_background_palettes(example_logo::test.palettes);
-    gfx.set_background_tilemap(0, example_logo::test.tiles);
-
-    let mut back = gfx.get_background().unwrap();
-
-    let mut entries: [u16; 30 * 20] = [0; 30 * 20];
-    for tile_id in 0..(30 * 20) {
-        let palette_entry = example_logo::test.palette_assignments[tile_id as usize] as u16;
-        entries[tile_id as usize] = tile_id | (palette_entry << 12);
-    }
-
-    back.draw_full_map(&entries, (30_u32, 20_u32).into(), 0);
-    back.show();
+    example_logo::display_logo(&mut gfx);
 
     loop {}
 }

agb/gfx/agb_logo.toml

@@ -0,0 +1,9 @@
+version = "1.0"
+
+# Only needed for within the agb crate
+crate_prefix = "crate"
+
+[image.test_logo]
+filename = "test_logo.png"
+transparent_colour = "010101"
+tile_size = "8x8"

agb/src/display/example_logo.rs

@@ -1,22 +1,29 @@
-include!(concat!(env!("OUT_DIR"), "/test_logo.rs"));
+use agb_image_converter::include_gfx;
+use crate::display::tiled0::Tiled0;
 
-#[test_case]
-fn logo_display(gba: &mut crate::Gba) {
-    let mut gfx = gba.display.video.tiled0();
+include_gfx!("gfx/agb_logo.toml");
 
-    gfx.set_background_palettes(test.palettes);
-    gfx.set_background_tilemap(0, test.tiles);
+pub fn display_logo(gfx: &mut Tiled0) {
+    gfx.set_background_palettes(agb_logo::test_logo.palettes);
+    gfx.set_background_tilemap(0, agb_logo::test_logo.tiles);
 
     let mut back = gfx.get_background().unwrap();
 
     let mut entries: [u16; 30 * 20] = [0; 30 * 20];
     for tile_id in 0..(30 * 20) {
-        let palette_entry = test.palette_assignments[tile_id as usize] as u16;
+        let palette_entry = agb_logo::test_logo.palette_assignments[tile_id as usize] as u16;
         entries[tile_id as usize] = tile_id | (palette_entry << 12);
     }
 
     back.draw_full_map(&entries, (30_u32, 20_u32).into(), 0);
     back.show();
+}
+
+#[test_case]
+fn logo_display(gba: &mut crate::Gba) {
+    let mut gfx = gba.display.video.tiled0();
+
+    display_logo(&mut gfx);
 
     crate::assert_image_output("gfx/test_logo.png");
 }