support to compile ftgrays/ftraster/gpac-evg

preparing for new renderer implementation

.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+    "C_Cpp.default.defines": [ "STANDALONE_",
+	"FALL_THROUGH=((void)0)", "FT_BEGIN_HEADER" ],
+    "C_Cpp.default.includePath": [ "src/evg", "src/raster" ]
+}

Cargo.toml

@@ -22,12 +22,30 @@ usvg  = "0.36"
 kurbo = "0.10"   # Bezier curves utils
 
 #build-time = { version = "0.1", git = "https://github.com/AlephAlpha/build-time" }
+png = { version = "0.17", optional = true }
+
+[lib]
+# Disable doctests as a workaround for https://github.com/rust-lang/rust-bindgen/issues/1313
+#doctest = false
+
+[features]
+#default = [ "cc" ]
+cc = [ "dep:cc", "dep:bindgen", "dep:glob", "dep:png" ]   # implied by optional dependency
 
 [dev-dependencies]
 #rexpect = "0.5"
 
 [build-dependencies]
+cc = { version = "1.0", optional = true }
+bindgen = { version = "0.68", optional = true }
+glob = { version = "0.3", optional = true }
 chrono = "0.4"
 
+[profile.release]
+codegen-units = 1
+strip = 'debuginfo'
+panic = 'abort'
+lto = 'fat' # true
+
 [workspace]
 

build.rs

@@ -1,16 +1,79 @@
 
-fn main() {     // https://doc.rust-lang.org/stable/cargo/reference/build-scripts.html
+//  https://doc.rust-lang.org/stable/cargo/reference/build-scripts.html
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    //println!("cargo:rerun-if-changed=build.rs");    // XXX: prevent re-run indead
     // By default, cargo always re-run the build script if any file within the package
     // is changed, and no any rerun-if instruction is emitted.
     println!("cargo:rerun-if-changed=src/");
 
     println!("cargo:rerun-if-changed=.git/index");
     let output = std::process::Command::new("git")
-        .args(["rev-parse", "--short", "HEAD"]).output().unwrap();
-    println!("cargo:rustc-env=BUILD_GIT_HASH={}", String::from_utf8(output.stdout).unwrap());
+        .args(["rev-parse", "--short", "HEAD"]).output()?;
+    println!("cargo:rustc-env=BUILD_GIT_HASH={}", String::from_utf8(output.stdout)?);
 
     println!("cargo:rustc-env=BUILD_TIMESTAMP={}",
         chrono::Local::now().format("%H:%M:%S%z %Y-%m-%d"));
 
-    //println!("cargo:rerun-if-changed=build.rs");    // XXX: prevent re-run indead
+  #[cfg(feature = "cc")] {  use std::path::PathBuf;
+    #[derive(Debug)] struct DoctestComment;
+    impl bindgen::callbacks::ParseCallbacks for DoctestComment {
+        fn process_comment(&self, comment: &str) -> Option<String> {
+            Some(format!("````c,ignore\n{comment}\n````"))  // FIXME:
+        }
+    }
+
+    let module = "ftgrays";
+    cc::Build::new().flag("-std=c17").flag("-pedantic")
+        .define("FALL_THROUGH", "((void)0)").file("src/raster/ftgrays.c")
+        .opt_level(3).define("NDEBUG", None).file("src/raster/ftraster.c")
+        .files(glob::glob("src/raster/stroke/*.c")?.filter_map(Result::ok))
+        .flag("-Wno-unused-variable")//.flag("-Wno-unused-function")
+        .define("STANDALONE_", None).compile(module);
+
+    // The bindgen::Builder is the main entry point to bindgen,
+    // and lets you build up options for the resulting bindings.
+    bindgen::Builder::default() //.header("src/raster/ftimage.h")
+        .clang_arg("-DSTANDALONE_").header("src/raster/ftgrays.h")
+        .clang_arg("-DFT_BEGIN_HEADER=").clang_arg("-DFT_END_HEADER=")
+        .clang_arg("-DFT_STATIC_BYTE_CAST(type,var)=(type)(unsigned char)(var)")
+        .allowlist_item("FT_OUTLINE_.*|FT_RASTER_FLAG_.*|FT_CURVE_TAG.*")
+        .layout_tests(false).derive_copy(false).allowlist_var("ft_standard_raster")
+        .allowlist_var("ft_grays_raster").allowlist_type("FT_Outline|FT_Pixel_Mode")
+        .default_enum_style(bindgen::EnumVariation::Rust { non_exhaustive: true })
+        .default_macro_constant_type(bindgen::MacroTypeVariation::Signed)
+        .parse_callbacks(Box::new(DoctestComment)).generate_comments(false) // XXX:
+        // Tell cargo to invalidate the built crate whenever any of the
+        // included header files changed.
+        .parse_callbacks(Box::new(bindgen::CargoCallbacks)).generate()?
+        .write_to_file(PathBuf::from(std::env::var("OUT_DIR")?).join(format!("{module}.rs")))?;
+
+    /* ln -s /path/to/freetype2/{include/freetype/ftimage.h,src/smooth/ftgrays.[ch],\
+             src/raster/ft{misc.h,raster.c}} src/raster/
+     * ln -s /path/to/freetype2/src/{raster/ftmisc.h,base/ft{stroke,trigon}.c} src/raster/stroke/
+     * ln -s /path/to/freetype2/include/freetype/ft{stroke,trigon,image}.h src/raster/stroke/
+     * ln -s /path/to/gpac/src/evg/{ftgrays.c,rast_soft.h,stencil.c,surface.c,\
+             raster_{argb,rgb,565,yuv}.c},raster3d.c src/evg/
+     * ln -s /path/to/gpac/src/utils/{path2d{,_stroke},math,alloc,color,error}.c src/evg/
+     * ln -s /path/gpac/include/gpac/{evg,setup,constants,maths,color,path2d,\
+             tools,thread}.h src/evg/gpac/
+     * touch src/evg/gpac/{Remotery,config_file,configuration,main,module,version}.h
+     */
+    let module = "gpac_evg";
+    cc::Build::new().flag("-std=c17").flag("-Isrc/evg").define("GPAC_FIXED_POINT", None)
+        .flag("-Wno-unused-parameter").define("GPAC_DISABLE_THREADS", None)
+        .flag("-Wno-pointer-sign").define("GPAC_DISABLE_LOG", None)
+        .files(glob::glob("src/evg/*.c")?.filter_map(Result::ok))
+        .opt_level(3).define("NDEBUG", None).compile(module);
+
+    bindgen::Builder::default().header("src/evg/gpac/evg.h").clang_arg("-Isrc/evg")
+        .default_enum_style(bindgen::EnumVariation::Rust { non_exhaustive: true })
+        .clang_arg("-DGPAC_DISABLE_THREADS").allowlist_function("gf_evg_s.*")
+        //.allowlist_item("GF_LINE_.*")
+        .clang_arg("-DGPAC_FIXED_POINT").allowlist_function("gf_path_.*")
+        .layout_tests(false).derive_copy(false).new_type_alias("Fixed")
+        .parse_callbacks(Box::new(bindgen::CargoCallbacks)).generate()?
+        .write_to_file(PathBuf::from(std::env::var("OUT_DIR")?).join(format!("{module}.rs")))?;
+  }
+
+    Ok(())
 }

src/lib.rs

@@ -3,3 +3,5 @@ pub mod tinyvg;
 pub mod render;
 pub mod convert;
 
+#[cfg(feature = "cc")] pub mod revg;
+