Let the develop example render the profile off, the look doubled, or a preset

Diagnostic only. "matrix" switches the camera profile off and
"look200" doubles its look, so a DNG's tables can be judged against
the matrix render; "preset:<name>" applies a shipped preset as the
menu does. The example now renders through render_detailed, the path
every frontend takes, because a preset with clarity in it composes a
detail stage that plain render refuses.

core/dr-gpu/examples/develop.rs

@@ -24,7 +24,7 @@ fn main() {
     let mut args = std::env::args().skip(1);
     let Some(input) = args.next() else {
         eprintln!("usage: develop <file.cr2> [out.ppm] [preset]");
-        eprintln!("  preset: neutral (default) | punchy | recover");
+        eprintln!("  preset: neutral (default) | matrix | look200 | punchy | recover | …");
         std::process::exit(2);
     };
     let output = args.next().unwrap_or_else(|| "develop.ppm".into());
@@ -78,6 +78,24 @@ fn main() {
             graph.set_param(brilliance::ID, brilliance::BRILLIANCE, 40.0);
             graph.set_param(white_balance::ID, white_balance::TEMPERATURE, 15.0);
         }
+        // The camera profile switched off: the matrix alone, as every
+        // photograph rendered before D20. Beside "neutral" on a DNG that
+        // embeds a profile, the difference is the profile's tables.
+        "matrix" => {
+            graph.set_param(
+                dr_pipeline::ops::camera_profile::ID,
+                dr_pipeline::ops::camera_profile::APPLY,
+                0.0,
+            );
+        }
+        // The profile's look table at twice its strength.
+        "look200" => {
+            graph.set_param(
+                dr_pipeline::ops::camera_profile::ID,
+                dr_pipeline::ops::camera_profile::LOOK,
+                200.0,
+            );
+        }
         // Contrast alone, so its effect can be judged without anything else
         // moving.
         "contrast" => {
@@ -109,6 +127,14 @@ fn main() {
             graph.set_param(curve::ID, curve::P0_Y, 0.12);
             graph.set_param(curve::ID, curve::P1_Y, 0.32);
         }
+        // A shipped preset by name — `preset:Vivid landscape` — applied as
+        // the presets menu applies it, so a look can be judged on a real file.
+        named if named.starts_with("preset:") => {
+            let name = &named["preset:".len()..];
+            let preset = dr_pipeline::bundled::lookup(&Default::default(), name)
+                .unwrap_or_else(|| panic!("no shipped preset called {name:?}"));
+            let _ = preset.apply(&mut graph, dr_pipeline::Scope::adjustments());
+        }
         _ => {}
     }
 
@@ -123,8 +149,15 @@ fn main() {
     let mut adjust = AdjustPass::new(&ctx);
     let (w, h) = image.size();
 
+    // Through the detail stage when the edit has one — clarity, sharpening
+    // — which is the path every frontend takes; `render` alone refuses such
+    // a shader.
     let t2 = std::time::Instant::now();
-    adjust.render(&image, &shader, w, h).expect("adjust");
+    let detail = graph.compose_detail(image.size(), (w, h));
+    let key = graph.invalidation().through(dr_pipeline::Affects::Colour);
+    adjust
+        .render_detailed(&image, &shader, w, h, None, &detail, key)
+        .expect("adjust");
     ctx.device
         .poll(wgpu::PollType::wait_indefinitely())
         .expect("poll");
@@ -134,8 +167,11 @@ fn main() {
     // path, and it must not recompile.
     graph.set_param(exposure::ID, exposure::EXPOSURE, 0.31);
     let again = graph.compose();
+    let key = graph.invalidation().through(dr_pipeline::Affects::Colour);
     let t3 = std::time::Instant::now();
-    adjust.render(&image, &again, w, h).expect("adjust");
+    adjust
+        .render_detailed(&image, &again, w, h, None, &detail, key)
+        .expect("adjust");
     ctx.device
         .poll(wgpu::PollType::wait_indefinitely())
         .expect("poll");