[AI] Add neural restore lighttable module for AI denoise and upscale

RELEASE_NOTES.md

@@ -63,6 +63,16 @@ changes (where available).
   MIGraphX, DirectML, or OpenVINO), and the lightweight decoder
   produces masks interactively.
 
+- Added neural restore module in the lighttable/darkroom sidebar for
+  AI-based image denoise and upscale. Supports NIND UNet denoiser and
+  BSRGAN 2x/4x super-resolution models via the ONNX backend. Features
+  include an interactive before/after split preview with area picker,
+  a detail recovery slider (wavelet-based texture restoration for
+  denoise), batch processing with tiled inference, and TIFF output
+  with automatic library import and image grouping. GPU acceleration
+  is supported through CUDA, ROCm/MIGraphX, DirectML, OpenVINO, and
+  CoreML execution providers.
+
 - Added `colorharmonizer` module that applies color harmony
   corrections in UCS color space, rotating hues toward a target
   harmony structure (complementary, split-complementary, triadic,

data/ai_models.json

@@ -18,6 +18,22 @@
       "min_version": "1.0",
       "github_asset": "mask-object-segnext-b2hq.dtmodel",
       "default": false
+    },
+    {
+      "id": "denoise-nind",
+      "name": "denoise nind",
+      "description": "UNet denoiser trained on NIND dataset",
+      "task": "denoise",
+      "github_asset": "denoise-nind.dtmodel",
+      "default": true
+    },
+    {
+      "id": "upscale-bsrgan",
+      "name": "upscale bsrgan",
+      "description": "BSRGAN 2x and 4x blind super-resolution",
+      "task": "upscale",
+      "github_asset": "upscale-bsrgan.dtmodel",
+      "default": true
     }
   ]
 }

data/darktableconfig.xml.in

@@ -3752,6 +3752,13 @@
     <shortdescription>raster mask files root folder</shortdescription>
     <longdescription>this folder (and sub-folders) contains PFM/PNG files used by the raster mask import module. (restart required)</longdescription>
   </dtconfig>
+<dtconfig>
+    <name>plugins/lighttable/neural_restore/preview_height</name>
+    <type min="100" max="800">int</type>
+    <default>200</default>
+    <shortdescription/>
+    <longdescription/>
+  </dtconfig>
   <dtconfig prefs="processing" section="general">
     <name>plugins/darkroom/workflow</name>
     <type>

src/CMakeLists.txt

@@ -462,6 +462,7 @@ if(USE_AI)
   FILE(GLOB SOURCE_FILES_AI
     "common/ai_models.c"
     "common/ai/segmentation.c"
+    "common/ai/restore.c"
     "develop/masks/object.c"
     "gui/preferences_ai.c"
   )

src/ai/CMakeLists.txt

@@ -16,6 +16,8 @@ pkg_check_modules(JSON_GLIB REQUIRED json-glib-1.0)
 # GTK3/RSVG needed for headers only (common/darktable.h -> utility.h -> gtk/gtk.h, librsvg/rsvg.h)
 pkg_check_modules(GTK3 REQUIRED gtk+-3.0)
 pkg_check_modules(RSVG2 REQUIRED librsvg-2.0)
+# lcms2 needed for headers (common/colorspaces.h included via darktable.h)
+pkg_check_modules(LCMS2 REQUIRED lcms2)
 
 # Include current directory for header
 target_include_directories(darktable_ai PUBLIC
@@ -26,6 +28,7 @@ target_include_directories(darktable_ai PUBLIC
   ${JSON_GLIB_INCLUDE_DIRS}
   ${GTK3_INCLUDE_DIRS}
   ${RSVG2_INCLUDE_DIRS}
+  ${LCMS2_INCLUDE_DIRS}
 )
 
 target_link_directories(darktable_ai PUBLIC