core: merge oak-common into oak-core

oak-common is gone; its modules (configstore, xmlutils, ocioutils,
oiioutils, colormath, colortransform, videoparams, ffmpegutils, ...)
now live in oak-core alongside the value types. The render value/GPU
types moved too: backend (wgpu context + DisplayRenderer), color
(ColorProcessor over ocio-rs), texture, frame, and the commonutil
config helpers.

Fix-ups to make the merged tree build and pass tests:

- oak-core Cargo.toml: wgpu back to 25 (the moved backend code is
  written against that API generation); add the toml/quick-xml/image
  deps oak-common carried.
- lib.rs: drop the duplicate 'pub mod error;'.
- error.rs: unified OAKCORE_* codes; restore Error::new() and
  From<OcioError> from oak-common's error type.
- backend.rs/color.rs: oak_core::/oak_render:: self-references
  rewritten to crate::; the shaderfx-dependent GPU effect test moved
  to oak-render's shaderfx tests (shaderfx depends on oak-node and
  cannot live in oak-core).
- oak-render's error module re-exports oak_core::error::{Error,
  Result}; the OAKRENDER_* codes stay as the public-code contract.
- oak-node jobs.rs: ColorProcessor imported from oak_core::color.
- Integration tests repointed at oak_core::{texture, frame, backend,
  color, colormath}.
- the display-ICC regression test treats an empty OAK_DISPLAY_ICC as
  unset, matching displayicc::env_override_icc.

crates/oak-render/tests/copier_test.rs

@@ -27,8 +27,8 @@ use std::time::Duration;
 use oak_core::{Rational, TimeRange};
 
 use oak_render::error::Error;
-use oak_render::frame::VideoParamsPod;
-use oak_render::texture::{Frame, Texture};
+use oak_core::frame::VideoParamsPod;
+use oak_core::texture::{Frame, Texture};
 use oak_render::ticket::TicketArena;
 use oak_render::worker::{InlineDispatcher, JobDispatch};
 

crates/oak-render/tests/footage_decode_test.rs

@@ -24,7 +24,7 @@
 
 use oak_core::{PixelFormat, Rational};
 
-use oak_render::texture::Texture;
+use oak_core::texture::Texture;
 
 mod common;
 
@@ -38,9 +38,9 @@ fn footage_decode_renders_known_content() {
 	// the color pipeline. Pin the working space to the legacy sRGB
 	// pass-through so the decoded pixels stay display-referred and the
 	// assertions below hold regardless of the ACEScg default.
-	oak_render::color::set_pipeline_color_settings(
-		oak_common::colormath::WorkingColorSpace::SrgbLegacy,
-		oak_common::colormath::OutputColorSpec::default(),
+	oak_core::color::set_pipeline_color_settings(
+		oak_core::colormath::WorkingColorSpace::SrgbLegacy,
+		oak_core::colormath::OutputColorSpec::default(),
 	);
 
 	// Program-generated media: 10 frames at 10fps, 64x64, known pattern

crates/oak-render/tests/graph_render.rs

@@ -33,7 +33,7 @@ use oak_node::project::Project;
 use oak_node::sequence::SequenceBehavior;
 use oak_node::track::{TrackBehavior, TrackListBehavior};
 
-use oak_render::texture::Texture;
+use oak_core::texture::Texture;
 
 mod common;
 
@@ -49,9 +49,9 @@ fn clip_path(tag: &str) -> std::path::PathBuf {
 /// pixel-value assertions hold regardless of the ACEScg default. All tests
 /// in this binary set the same value, so the shared global is race-free.
 fn pin_legacy_working_space() {
-    oak_render::color::set_pipeline_color_settings(
-        oak_common::colormath::WorkingColorSpace::SrgbLegacy,
-        oak_common::colormath::OutputColorSpec::default(),
+    oak_core::color::set_pipeline_color_settings(
+        oak_core::colormath::WorkingColorSpace::SrgbLegacy,
+        oak_core::colormath::OutputColorSpec::default(),
     );
 }
 
@@ -366,7 +366,7 @@ fn channel(data: &[u8], x: usize, y: usize, c: usize) -> f32 {
 /// when no GPU adapter exists.
 #[test]
 fn shader_job_opacity_halves_pixels() {
-    if oak_render::backend::GpuContext::shared().is_none() {
+    if oak_core::backend::GpuContext::shared().is_none() {
         eprintln!("skipping shader_job_opacity_halves_pixels: no GPU adapter");
         return;
     }
@@ -452,7 +452,7 @@ fn shader_job_opacity_halves_pixels() {
 /// boundary pixel on the right half. Skipped when no GPU adapter exists.
 #[test]
 fn shader_job_blur_smooths_edge() {
-    if oak_render::backend::GpuContext::shared().is_none() {
+    if oak_core::backend::GpuContext::shared().is_none() {
         eprintln!("skipping shader_job_blur_smooths_edge: no GPU adapter");
         return;
     }
@@ -554,11 +554,11 @@ fn shader_job_blur_smooths_edge() {
 /// Skipped when no GPU adapter or OCIO config exists.
 #[test]
 fn chromakey_job_keys_green_with_ociobased_stub() {
-    if oak_render::backend::GpuContext::shared().is_none() {
+    if oak_core::backend::GpuContext::shared().is_none() {
         eprintln!("skipping chromakey_job_keys_green_with_ociobased_stub: no GPU adapter");
         return;
     }
-    if oak_render::color::set_up_default_config().is_err() {
+    if oak_core::color::set_up_default_config().is_err() {
         eprintln!("skipping chromakey_job_keys_green_with_ociobased_stub: no OCIO config");
         return;
     }

crates/oak-render/tests/pipeline_test.rs

@@ -27,9 +27,9 @@ mod common;
 
 use oak_core::{PixelFormat, Rational};
 
-use oak_render::backend::{BackendKind, DisplayRenderer, GpuContext};
-use oak_render::frame::VideoParamsPod;
-use oak_render::texture::{Frame, Texture};
+use oak_core::backend::{BackendKind, DisplayRenderer, GpuContext};
+use oak_core::frame::VideoParamsPod;
+use oak_core::texture::{Frame, Texture};
 
 /// A frame rendered through the CPU backend is F32 RGBA (not u8) and
 /// preserves out-of-[0,1] HDR values without clamping.
@@ -64,11 +64,11 @@ fn cpu_path_stays_f32_unclamped() {
 /// (CPU path; the GPU color-managed path is documented-deferred).
 #[test]
 fn blit_applies_ocio_in_float() {
-	let _ = oak_render::color::set_up_default_config();
-	let processor = oak_render::color::ColorProcessor::create(
+	let _ = oak_core::color::set_up_default_config();
+	let processor = oak_core::color::ColorProcessor::create(
 		"ACEScg",
 		"sRGB Encoded Rec.709 (sRGB)",
-		oak_render::color::Direction::Normal,
+		oak_core::color::Direction::Normal,
 	)
 	.expect("handle always returned");
 	if !processor.is_valid() {
@@ -118,7 +118,7 @@ fn blit_applies_ocio_in_float() {
 		.blit_color_managed(
 			Some(&src),
 			&mut dst,
-			Some(&oak_render::color::ColorProcessor::pass_through()),
+			Some(&oak_core::color::ColorProcessor::pass_through()),
 		)
 		.unwrap();
 }

crates/oak-render/tests/ticket_worker_test.rs

@@ -27,13 +27,13 @@ use std::time::Duration;
 use oak_core::{Rational, TimeRange};
 
 use oak_render::error::Error;
-use oak_render::frame::VideoParamsPod;
-use oak_render::texture::{Frame, Texture};
+use oak_core::frame::VideoParamsPod;
+use oak_core::texture::{Frame, Texture};
 use oak_render::ticket::{TicketArena, TicketId, VideoTicketParams};
 use oak_render::worker::{GraphSnapshotStore, InlineDispatcher, JobDispatch};
 
 /// Unwrap a video ticket payload for assertions.
-fn res_video(res: &oak_render::ticket::TicketPayload) -> &oak_render::texture::Texture {
+fn res_video(res: &oak_render::ticket::TicketPayload) -> &oak_core::texture::Texture {
 	match res {
 		oak_render::ticket::TicketPayload::Video(t) => t,
 		_ => panic!("expected a video payload"),