feat: add svg thumbnail support (port #442) (#540)

* feat: add svg thumbnail support

Co-Authored-By: Tyrannicodin <86689800+Tyrannicodin@users.noreply.github.com>

* flip `svg.isValid()` logic check

* tests: add test comparing svg to png snapshot

Co-Authored-By: yed <yedpodtrzitko@users.noreply.github.com>

---------

Co-authored-by: Tyrannicodin <86689800+Tyrannicodin@users.noreply.github.com>
Co-authored-by: yed <yedpodtrzitko@users.noreply.github.com>

Author: 3 people

tagstudio/src/qt/widgets/thumb_renderer.py

@@ -28,8 +28,9 @@
 from PIL.Image import DecompressionBombError
 from pillow_heif import register_avif_opener, register_heif_opener
 from pydub import exceptions
-from PySide6.QtCore import QObject, QSize, Qt, Signal
-from PySide6.QtGui import QGuiApplication, QPixmap
+from PySide6.QtCore import QBuffer, QObject, QSize, Qt, Signal
+from PySide6.QtGui import QGuiApplication, QImage, QPainter, QPixmap
+from PySide6.QtSvg import QSvgRenderer
 from src.core.constants import FONT_SAMPLE_SIZES, FONT_SAMPLE_TEXT
 from src.core.media_types import MediaCategories, MediaType
 from src.core.palette import ColorType, UiColor, get_ui_color
@@ -750,8 +751,33 @@ def _image_vector_thumb(self, filepath: Path, size: int) -> Image.Image:
             filepath (Path): The path of the file.
             size (tuple[int,int]): The size of the thumbnail.
         """
-        # TODO: Implement.
         im: Image.Image = None
+        # Create an image to draw the svg to and a painter to do the drawing
+        image: QImage = QImage(size, size, QImage.Format.Format_ARGB32)
+        image.fill("#1e1e1e")
+
+        # Create an svg renderer, then render to the painter
+        svg: QSvgRenderer = QSvgRenderer(str(filepath))
+
+        if not svg.isValid():
+            raise UnidentifiedImageError
+
+        painter: QPainter = QPainter(image)
+        svg.setAspectRatioMode(Qt.AspectRatioMode.KeepAspectRatio)
+        svg.render(painter)
+        painter.end()
+
+        # Write the image to a buffer as png
+        buffer: QBuffer = QBuffer()
+        buffer.open(QBuffer.OpenModeFlag.ReadWrite)
+        image.save(buffer, "PNG")
+
+        # Load the image from the buffer
+        im = Image.new("RGB", (size, size), color="#1e1e1e")
+        im.paste(Image.open(BytesIO(buffer.data().data())))
+        im = im.convert(mode="RGB")
+
+        buffer.close()
         return im
 
     def _model_stl_thumb(self, filepath: Path, size: int) -> Image.Image:
@@ -924,6 +950,7 @@ def render(
                         ext, MediaCategories.IMAGE_RAW_TYPES, mime_fallback=True
                     ):
                         image = self._image_raw_thumb(_filepath)
+                    # Vector Images --------------------------------------------
                     elif MediaCategories.is_ext_in_category(
                         ext, MediaCategories.IMAGE_VECTOR_TYPES, mime_fallback=True
                     ):

tagstudio/tests/fixtures/sample.svg

@@ -0,0 +1,21 @@
+# Copyright (C) 2024 Travis Abendshien (CyanVoxel).
+# Licensed under the GPL-3.0 License.
+# Created for TagStudio: https://github.com/CyanVoxel/TagStudio
+
+import io
+from pathlib import Path
+
+from PIL import Image
+from src.qt.widgets.thumb_renderer import ThumbRenderer
+from syrupy.extensions.image import PNGImageSnapshotExtension
+
+
+def test_svg_preview(cwd, snapshot):
+    file_path: Path = cwd / "fixtures" / "sample.svg"
+    renderer = ThumbRenderer()
+    img: Image.Image = renderer._image_vector_thumb(file_path, 200)
+
+    img_bytes = io.BytesIO()
+    img.save(img_bytes, format="PNG")
+    img_bytes.seek(0)
+    assert img_bytes.read() == snapshot(extension_class=PNGImageSnapshotExtension)