feat: render .clip thumbnails. (#1150)

* feat: render .clip thumbnails.

* doc: document .clip support.

* fix: add CLIP_STUDIO_PAINT_TYPES to ALL_CATEGORIES.

* explicitly close connection.

docs/preview-support.md

@@ -79,8 +79,9 @@ Audio thumbnails will default to embedded cover art (if any) and fallback to gen
 Preview support for office documents or well-known project file formats varies by the format and whether or not embedded thumbnails are available to be read from. OpenDocument-based files are typically supported.
 
 | Filetype                             | Extensions            | Preview Type                                                               |
-| ------------------------------------ | --------------------- | -------------------------------------------------------------------------- |
+|--------------------------------------| --------------------- | -------------------------------------------------------------------------- |
 | Blender                              | `.blend`, `.blend<#>` | Embedded thumbnail :material-alert-circle:{ title="If available in file" } |
+| Clip Studio Paint                    | `.clip`               | Embedded thumbnail                                                         |
 | Keynote (Apple iWork)                | `.key`                | Embedded thumbnail                                                         |
 | Krita[^3]                            | `.kra`, `.krz`        | Embedded thumbnail :material-alert-circle:{ title="If available in file" } |
 | Mdipack (FireAlpaca, Medibang Paint) | `.mdp`                | Embedded thumbnail                                                         |

src/tagstudio/core/media_types.py

@@ -33,6 +33,7 @@ class MediaType(str, Enum):
     AUDIO_MIDI = "audio_midi"
     AUDIO = "audio"
     BLENDER = "blender"
+    CLIP_STUDIO_PAINT = "clip_studio_paint"
     CODE = "code"
     DATABASE = "database"
     DISK_IMAGE = "disk_image"
@@ -177,6 +178,7 @@ class MediaCategories:
         ".blend31",
         ".blend32",
     }
+    _CLIP_STUDIO_PAINT_SET: set[str] = {".clip"}
     _CODE_SET: set[str] = {
         ".bat",
         ".cfg",
@@ -456,6 +458,12 @@ class MediaCategories:
         is_iana=False,
         name="blender",
     )
+    CLIP_STUDIO_PAINT_TYPES = MediaCategory(
+        media_type=MediaType.CLIP_STUDIO_PAINT,
+        extensions=_CLIP_STUDIO_PAINT_SET,
+        is_iana=False,
+        name="clip studio paint",
+    )
     CODE_TYPES = MediaCategory(
         media_type=MediaType.CODE,
         extensions=_CODE_SET,
@@ -644,6 +652,7 @@ class MediaCategories:
         AUDIO_MIDI_TYPES,
         AUDIO_TYPES,
         BLENDER_TYPES,
+        CLIP_STUDIO_PAINT_TYPES,
         DATABASE_TYPES,
         DISK_IMAGE_TYPES,
         DOCUMENT_TYPES,

src/tagstudio/qt/previews/renderer.py

@@ -8,6 +8,7 @@ import contextlib
 import hashlib
 import math
 import os
+import sqlite3
 import struct
 import tarfile
 import xml.etree.ElementTree as ET
@@ -1458,6 +1459,35 @@ class ThumbRenderer(QObject):
 
         return im
 
+    @staticmethod
+    def _clip_thumb(filepath: Path) -> Image.Image | None:
+        """Extract the thumbnail from the SQLite database embedded in a .clip file.
+
+        Args:
+            filepath (Path): The path of the .clip file.
+
+        Returns:
+            Image: The embedded thumbnail, if extractable.
+        """
+        im: Image.Image | None = None
+        try:
+            with open(filepath, "rb") as f:
+                blob = f.read()
+                sqlite_index = blob.find(b"SQLite format 3")
+                if sqlite_index == -1:
+                    return im
+
+            with sqlite3.connect(":memory:") as conn:
+                conn.deserialize(blob[sqlite_index:])
+                thumbnail = conn.execute("SELECT ImageData FROM CanvasPreview").fetchone()
+                if thumbnail:
+                    im = Image.open(BytesIO(thumbnail[0]))
+            conn.close()
+        except Exception as e:
+            logger.error("Couldn't render thumbnail", filepath=filepath, error=type(e).__name__)
+
+        return im
+
     def render(
         self,
         timestamp: float,
@@ -1708,6 +1738,11 @@ class ThumbRenderer(QObject):
                     ext, MediaCategories.KRITA_TYPES, mime_fallback=True
                 ):
                     image = self._krita_thumb(_filepath)
+                # Clip Studio Paint ============================================
+                elif MediaCategories.is_ext_in_category(
+                    ext, MediaCategories.CLIP_STUDIO_PAINT_TYPES
+                ):
+                    image = self._clip_thumb(_filepath)
                 # VTF ==========================================================
                 elif MediaCategories.is_ext_in_category(
                     ext, MediaCategories.SOURCE_ENGINE_TYPES, mime_fallback=True