add support for loading images as quads

poetry.lock

@@ -1029,6 +1029,91 @@ files = [
 [package.dependencies]
 ptyprocess = ">=0.5"
 
+[[package]]
+name = "pillow"
+version = "10.2.0"
+description = "Python Imaging Library (Fork)"
+optional = false
+python-versions = ">=3.8"
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+    {file = "pillow-10.2.0.tar.gz", hash = "sha256:e87f0b2c78157e12d7686b27d63c070fd65d994e8ddae6f328e0dcf4a0cd007e"},
+]
+
+[package.extras]
+docs = ["furo", "olefile", "sphinx (>=2.4)", "sphinx-copybutton", "sphinx-inline-tabs", "sphinx-removed-in", "sphinxext-opengraph"]
+fpx = ["olefile"]
+mic = ["olefile"]
+tests = ["check-manifest", "coverage", "defusedxml", "markdown2", "olefile", "packaging", "pyroma", "pytest", "pytest-cov", "pytest-timeout"]
+typing = ["typing-extensions"]
+xmp = ["defusedxml"]
+
 [[package]]
 name = "prompt-toolkit"
 version = "3.0.43"
@@ -1611,4 +1696,4 @@ multidict = ">=4.0"
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.9"
-content-hash = "92566c9fc24a286eea553f28b583fe6de53d7ecb595be508a0ce4ae9ca9f58c6"
+content-hash = "16d385dac0b8683b9d66b91696658ecf47a60fd19e08278f189c79858fe95563"

pyproject.toml

@@ -20,6 +20,7 @@ aiohttp-devtools = "^1.1.2"
 
 # Misc
 pygltflib = "^1.16.1"
+pillow = "^10.2.0"
 
 [build-system]
 requires = ["poetry-core"]

yacv_server/__init__.py

@@ -3,6 +3,7 @@ import os
 import time
 
 from aiohttp import web
+from build123d import Vector
 
 from server import Server
 
@@ -18,6 +19,7 @@ if 'YACV_DISABLE_SERVER' not in os.environ:
 # Expose some nice aliases using the default server instance
 show = server.show
 show_object = show
+show_image = server.show_image
 show_all = server.show_cad_all
 
 
@@ -26,9 +28,13 @@ def _get_app() -> web.Application:
     logging.basicConfig(level=logging.DEBUG)
     from logo import build_logo
     from build123d import Axis
-    logo = build_logo(False)
+    logo = build_logo()
     server.show_cad(logo, 'Logo')
-    server.show_cad(logo.faces().group_by(Axis.X)[0].face().center_location, 'Location')
+    img_location = logo.faces().group_by(Axis.X)[0].face().center_location  # Avoid overlapping:
+    img_location.position = Vector(img_location.position.X - 1e-2, img_location.position.Y, img_location.position.Z)
+    server.show_cad(img_location, 'Location')
+    img_path = os.path.join(os.path.dirname(__file__), '..', 'assets', 'img.jpg')
+    server.show_image(img_path, img_location, 20)
     return server.app
 
 

yacv_server/cad.py

@@ -1,11 +1,14 @@
 """
 Utilities to work with CAD objects
 """
+import hashlib
 from typing import Optional, Union, List, Tuple
 
 from OCP.TopLoc import TopLoc_Location
 from OCP.TopoDS import TopoDS_Shape
 
+from gltf import GLTFMgr
+
 CADLike = Union[TopoDS_Shape, TopLoc_Location]  # Faces, Edges, Vertices and Locations for now
 
 
@@ -54,4 +57,68 @@ def grab_all_cad() -> List[Tuple[str, CADLike]]:
                 shapes.append((key, shape))
     return shapes
 
-# TODO: Image to CAD utility and show_image shortcut on server.
+
+def image_to_gltf(source: str | bytes, center: any, ppmm: int, name: Optional[str] = None,
+                  save_mime: str = 'image/jpeg') -> Tuple[bytes, str]:
+    """Convert an image to a GLTF CAD object, indicating the center location and pixels per millimeter."""
+    from PIL import Image
+    import io
+    import os
+    from build123d import Plane
+    from build123d import Location
+    from build123d import Vector
+
+    # Handle arguments
+    if name is None:
+        if isinstance(source, str):
+            name = os.path.basename(source)
+        else:
+            hasher = hashlib.md5()
+            hasher.update(source)
+            name = 'image_' + hasher.hexdigest()
+    format: str
+    if save_mime == 'image/jpeg':
+        format = 'JPEG'
+    elif save_mime == 'image/png':
+        format = 'PNG'
+    else:
+        raise ValueError(f'Unsupported save MIME type (for GLTF files): {save_mime}')
+
+    # Get the plane of the image
+    center_loc = get_shape(center)
+    if not isinstance(center_loc, TopLoc_Location):
+        raise ValueError('Center location not valid')
+    plane = Plane(Location(center_loc))
+    # Convert coordinates system
+    plane.origin = Vector(plane.origin.X, plane.origin.Z, -plane.origin.Y)
+    plane.z_dir = -plane.y_dir
+    plane.y_dir = plane.z_dir
+
+    def vert(v: Vector) -> Tuple[float, float, float]:
+        return v.X, v.Y, v.Z
+
+    # Load the image to a byte buffer
+    img = Image.open(source)
+    img_buf = io.BytesIO()
+    img.save(img_buf, format=format)
+    img_buf = img_buf.getvalue()
+
+    # Build the gltf
+    mgr = GLTFMgr(image=(img_buf, save_mime))
+    mgr.add_face([
+        vert(plane.origin - plane.x_dir * img.width / (2 * ppmm) - plane.y_dir * img.height / (2 * ppmm)),
+        vert(plane.origin + plane.x_dir * img.width / (2 * ppmm) - plane.y_dir * img.height / (2 * ppmm)),
+        vert(plane.origin + plane.x_dir * img.width / (2 * ppmm) + plane.y_dir * img.height / (2 * ppmm)),
+        vert(plane.origin - plane.x_dir * img.width / (2 * ppmm) + plane.y_dir * img.height / (2 * ppmm)),
+    ], [
+        (0, 2, 1),
+        (0, 3, 2),
+    ], [
+        (0, 0),
+        (1, 0),
+        (1, 1),
+        (0, 1),
+    ])
+
+    # Return the GLTF binary blob and the suggested name of the image
+    return b''.join(mgr.gltf.save_to_bytes()), name

yacv_server/gltf.py

@@ -12,7 +12,7 @@ _checkerboard_image_bytes = base64.decodebytes(
 class GLTFMgr:
     """A utility class to build our GLTF2 objects easily and incrementally"""
 
-    def __init__(self):
+    def __init__(self, image: Tuple[bytes, str] = (_checkerboard_image_bytes, 'image/png')):
         self.gltf = GLTF2(
             asset=Asset(generator=f"yacv_server@{importlib.metadata.version('yacv_server')}"),
             scene=0,
@@ -20,14 +20,13 @@ class GLTFMgr:
             nodes=[Node(mesh=0)],
             meshes=[Mesh(primitives=[])],
             accessors=[],
-            bufferViews=[BufferView(buffer=0, byteLength=len(_checkerboard_image_bytes), byteOffset=0)],
+            bufferViews=[BufferView(buffer=0, byteLength=len(image[0]), byteOffset=0)],
-            buffers=[Buffer(byteLength=len(_checkerboard_image_bytes))],
+            buffers=[Buffer(byteLength=len(image[0]))],
             samplers=[Sampler(magFilter=NEAREST)],
             textures=[Texture(source=0, sampler=0)],
-            images=[Image(bufferView=0, mimeType='image/png')],
+            images=[Image(bufferView=0, mimeType=image[1])],
         )
-        self.gltf.set_binary_blob(_checkerboard_image_bytes)
+        self.gltf.set_binary_blob(image[0])
-        # TODO: Custom image support for loading textured planes as CAD objects
 
     def add_face(self, vertices_raw: List[Tuple[float, float, float]], indices_raw: List[Tuple[int, int, int]],
                  tex_coord_raw: List[Tuple[float, float]]):

yacv_server/server.py

@@ -15,7 +15,7 @@ from aiohttp import web
 from build123d import Shape, Axis, Location, Vector
 from dataclasses_json import dataclass_json
 
-from cad import get_shape, grab_all_cad
+from cad import get_shape, grab_all_cad, image_to_gltf
 from mylogger import logger
 from pubsub import BufferedPubSub
 from tessellate import _hashcode, tessellate
@@ -190,7 +190,7 @@ class Server:
             self.show_cad(any_object, name, **kwargs)
 
     def show_gltf(self, gltf: bytes, name: Optional[str] = None, **kwargs):
-        """Publishes any single-file GLTF object to the server (GLB format recommended)."""
+        """Publishes any single-file GLTF object to the server."""
         start = time.time()
         # Precompute the info and send it to the client as if it was a CAD object
         precomputed_info = self._show_common(name, _hashcode(gltf, **kwargs), start, kwargs=kwargs)
@@ -200,6 +200,14 @@ class Server:
         publish_to.publish_nowait(b'')  # Signal the end of the stream
         self.object_events[precomputed_info.name] = publish_to
 
+    def show_image(self, source: str | bytes, center: any, ppmm: int, name: Optional[str] = None,
+                   save_mime: str = 'image/jpeg', **kwargs):
+        """Publishes an image as a quad GLTF object, indicating the center location and pixels per millimeter."""
+        # Convert the image to a GLTF CAD object
+        gltf, name = image_to_gltf(source, center, ppmm, name, save_mime)
+        # Publish it like any other GLTF object
+        self.show_gltf(gltf, name, **kwargs)
+
     def show_cad(self, obj: Union[TopoDS_Shape, any], name: Optional[str] = None, **kwargs):
         """Publishes a CAD object to the server"""
         start = time.time()