Replace the C++ implementation with the Rust port

The Rust port (formerly gipfel-rs) is now the official successor to the
FLTK/GSL C++ code base. This squashes the port into a single commit and
removes the C++ sources (they remain in the git history below).

Layout:
  crates/gipfel-core  headless core: hills, panorama geometry, projections
                      (maxima-generated derivatives), pure-Rust LM fit,
                      gipfel: JPEG comment + EXIF I/O, profiles, stitching
  crates/gipfel-cli   command-line tools (export, info, stitch, profiles)
  crates/gipfel-app   Cosmic DE (libcosmic) GUI, binary name `gipfel`
  codegen/            maxima scripts + regen.sh for the projection code
  tests/              golden files + C++ reference harnesses (historical)

The original README is kept for now; it will be updated to describe the
Rust build. gipfel.dat, AUTHORS, ChangeLog and NEWS are unchanged.

1 files changed, 24 insertions, 0 deletions

diff --git a/crates/gipfel-core/examples/genjpg.rs b/crates/gipfel-core/examples/genjpg.rs
new file mode 100644
index 0000000..ae12b94
--- /dev/null
+++ b/crates/gipfel-core/examples/genjpg.rs
@@ -0,0 +1,24 @@
+// creates a test JPEG with a gipfel comment: genjpg <out.jpg>
+use gipfel_core::metadata::ImageMetaData;
+
+fn main() {
+    let out = std::env::args().nth(1).unwrap();
+    let (w, h) = (1600u32, 900u32);
+    let img = image::DynamicImage::new_rgb8(w, h).grayscale();
+    img.save(&out).unwrap();
+
+    let mut md = ImageMetaData::new();
+    md.longitude = 11.15;
+    md.latitude = 47.36;
+    md.height = 2100.0;
+    md.direction = 20.0;
+    md.pitch = 0.0;
+    md.roll = 1.0;
+    md.focal_length_35mm = 35.0;
+    md.projection_type = 0;
+    md.k0 = 0.0;
+    md.k1 = 0.0;
+    md.x0 = 0.0;
+    md.save_image(&out, &out).unwrap();
+    println!("wrote {}", out);
+}