Implement initial chromaticity inspector.

src/apps/ocioview/ocioview/inspect/__init__.py

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright Contributors to the OpenColorIO Project.
 
+from .chromaticities_inspector import ChromaticitiesInspector
 from .code_inspector import CodeInspector
 from .curve_inspector import CurveInspector
 from .log_inspector import LogInspector

src/apps/ocioview/ocioview/inspect/chromaticities_inspector.py

@@ -0,0 +1,122 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright Contributors to the OpenColorIO Project.
+
+import numpy as np
+import pygfx as gfx
+import PyOpenColorIO as ocio
+from colour_visuals import *
+from PySide6 import QtCore, QtGui, QtWidgets
+from typing import Optional
+
+from ..viewer import WgpuCanvasOffScreenViewer
+from ..message_router import MessageRouter
+from ..utils import get_glyph_icon, subsampling_factor
+
+
+class ChromaticitiesInspector(QtWidgets.QWidget):
+    @classmethod
+    def label(cls) -> str:
+        return "Chromaticities"
+
+    @classmethod
+    def icon(cls) -> QtGui.QIcon:
+        return get_glyph_icon("mdi6.grain")
+
+    def __init__(self, parent: Optional[QtCore.QObject] = None):
+        super().__init__(parent=parent)
+
+        self._cpu_proc = None
+        self._image_array = None
+
+        self._wgpu_viewer = WgpuCanvasOffScreenViewer()
+        self._root = None
+        self._visuals = {}
+        self._setup_scene()
+
+        # Layout
+        layout = QtWidgets.QHBoxLayout()
+        self.setLayout(layout)
+        layout.addWidget(self._wgpu_viewer)
+
+        msg_router = MessageRouter.get_instance()
+        msg_router.processor_ready.connect(self._on_processor_ready)
+        msg_router.image_ready.connect(self._on_image_ready)
+
+    @property
+    def wgpu_viewer(self):
+        return self._wgpu_viewer
+
+    def _setup_scene(self):
+        self._wgpu_viewer.wgpu_scene.add(
+            gfx.Background(
+                None, gfx.BackgroundMaterial(np.array([0.18, 0.18, 0.18]))
+            )
+        )
+        self._visuals = {
+            "grid": VisualGrid(size=2),
+            "chromaticity_diagram": VisualChromaticityDiagramCIE1931(
+                kwargs_visual_chromaticity_diagram={"opacity": 0.25}
+            ),
+            "rgb_scatter_3d": VisualRGBScatter3D(np.zeros(3), "ACES2065-1", size=4),
+        }
+
+        self._root = gfx.Group()
+        for visual in self._visuals.values():
+            self._root.add(visual)
+        self._wgpu_viewer.wgpu_scene.add(self._root)
+
+    def reset(self) -> None:
+        pass
+
+    def showEvent(self, event: QtGui.QShowEvent) -> None:
+        """Start listening for processor updates, if visible."""
+        super().showEvent(event)
+
+        msg_router = MessageRouter.get_instance()
+        msg_router.set_processor_updates_allowed(True)
+        msg_router.set_image_updates_allowed(True)
+
+    def hideEvent(self, event: QtGui.QHideEvent) -> None:
+        """Stop listening for processor updates, if not visible."""
+        super().hideEvent(event)
+
+        msg_router = MessageRouter.get_instance()
+        msg_router.set_processor_updates_allowed(False)
+        msg_router.set_image_updates_allowed(False)
+
+    @QtCore.Slot(ocio.CPUProcessor)
+    def _on_processor_ready(self, cpu_proc: ocio.CPUProcessor) -> None:
+        print("ChromaticitiesInspector._on_processor_ready")
+
+        self._cpu_proc = cpu_proc
+        # group_transform = self._cpu_proc.createGroupTransform()
+        print(dir(self._cpu_proc))
+
+        image_array = np.copy(self._image_array)
+        self._cpu_proc.applyRGB(image_array)
+        self._visuals["rgb_scatter_3d"].RGB = image_array
+        self._wgpu_viewer.render()
+
+    @QtCore.Slot(np.ndarray)
+    def _on_image_ready(self, image_array: np.ndarray) -> None:
+        print("ChromaticitiesInspector._on_image_ready")
+
+        sub_sampling_factor = int(
+            np.sqrt(subsampling_factor(image_array, 1e6)))
+        self._image_array = image_array[
+                ::sub_sampling_factor, ::sub_sampling_factor, ...
+            ]
+
+        if self._cpu_proc is None:
+            self._visuals["rgb_scatter_3d"].RGB = self._image_array
+            self._wgpu_viewer.render()
+
+
+
+if __name__ == "__main__":
+    application = QtWidgets.QApplication([])
+    chromaticity_inspector = ChromaticitiesInspector()
+    chromaticity_inspector.resize(800, 600)
+    chromaticity_inspector.show()
+
+    application.exec()

src/apps/ocioview/ocioview/inspect_dock.py

@@ -5,7 +5,7 @@
 
 from PySide6 import QtCore, QtWidgets
 
-from .inspect import CodeInspector, CurveInspector, LogInspector
+from .inspect import ChromaticitiesInspector, CodeInspector, CurveInspector, LogInspector
 from .utils import get_glyph_icon
 from .widgets.structure import TabbedDockWidget
 
@@ -25,11 +25,17 @@ def __init__(self, parent: Optional[QtCore.QObject] = None):
         self.tabs.setTabPosition(QtWidgets.QTabWidget.West)
 
         # Widgets
+        self.chromaticities_inspector = ChromaticitiesInspector()
         self.curve_inspector = CurveInspector()
         self.code_inspector = CodeInspector()
         self.log_inspector = LogInspector()
 
         # Layout
+        self.add_tab(
+            self.chromaticities_inspector,
+            self.chromaticities_inspector.label(),
+            self.chromaticities_inspector.icon(),
+        )
         self.add_tab(
             self.curve_inspector,
             self.curve_inspector.label(),
@@ -48,6 +54,7 @@ def __init__(self, parent: Optional[QtCore.QObject] = None):
 
     def reset(self) -> None:
         """Reset data for all inspectors."""
+        self.chromaticities_inspector.reset()
         self.curve_inspector.reset()
         self.code_inspector.reset()
         self.log_inspector.reset()

src/apps/ocioview/ocioview/utils.py

@@ -8,6 +8,7 @@
 from typing import Optional, Union
 
 import PyOpenColorIO as ocio
+import numpy as np
 import qtawesome
 from pygments import highlight
 from pygments.lexers import GLShaderLexer, HLSLShaderLexer, XmlLexer, YamlLexer
@@ -133,7 +134,9 @@ def item_type_label(item_type: type) -> str:
     :param item_type: Config item type
     :return: Friendly type name
     """
-    return " ".join(filter(None, re.split(r"([A-Z]+[a-z]+)", item_type.__name__)))
+    return " ".join(
+        filter(None, re.split(r"([A-Z]+[a-z]+)", item_type.__name__))
+    )
 
 
 def m44_to_m33(m44: list) -> list:
@@ -176,7 +179,9 @@ def config_to_html(config: ocio.Config) -> str:
     )
 
 
-def processor_to_ctf_html(processor: ocio.Processor) -> tuple[str, ocio.GroupTransform]:
+def processor_to_ctf_html(
+    processor: ocio.Processor,
+) -> tuple[str, ocio.GroupTransform]:
     """Return processor CTF formatted as HTML."""
     config = ocio.GetCurrentConfig()
     group_tf = processor.createGroupTransform()
@@ -218,14 +223,20 @@ def processor_to_shader_html(
     Return processor shader in the requested language, formatted as
     HTML.
     """
-    gpu_shader_desc = ocio.GpuShaderDesc.CreateShaderDesc(language=gpu_language)
+    gpu_shader_desc = ocio.GpuShaderDesc.CreateShaderDesc(
+        language=gpu_language
+    )
     gpu_proc.extractGpuShaderInfo(gpu_shader_desc)
     shader_data = gpu_shader_desc.getShaderText()
 
     return increase_html_lineno_padding(
         highlight(
             shader_data,
-            (GLShaderLexer if "GLSL" in gpu_language.name else HLSLShaderLexer)(),
+            (
+                GLShaderLexer
+                if "GLSL" in gpu_language.name
+                else HLSLShaderLexer
+            )(),
             HtmlFormatter(linenos="inline"),
         )
     )
@@ -252,3 +263,23 @@ def float_to_uint8(value: float) -> int:
     :return: Integer value
     """
     return max(0, min(255, int(value * 255)))
+
+
+def subsampling_factor(a: np.ndarray, maximum_size: float) -> int:
+    """
+    Return the best factor to sub-sample given :math:`a` array and have its
+    size less or equal to given maximum size.
+
+    :param a: Array :math:`a` to find the best sub-sample factor.
+    :param maximum_size: Maximum size of the sub-sampled array :math:`a`.
+    :return: Sub-sampling factor.
+    """
+
+    size = a.size
+
+    sub_sampling_factor = 1
+    while True:
+        if size / sub_sampling_factor <= maximum_size:
+            return sub_sampling_factor
+
+        sub_sampling_factor += 1

src/apps/ocioview/ocioview/viewer/__init__.py

@@ -2,4 +2,5 @@
 # Copyright Contributors to the OpenColorIO Project.
 
 from .image_viewer import ViewerChannels, ImageViewer
+from .offscreen_viewer import WgpuCanvasOffScreenViewer
 from .utils import load_image