Thumb in initial image format

CHANGES.rst

@@ -8,7 +8,7 @@ Changes
 - Swipe support
 - More space for images
 - Restructure repository
-- Use JPEG instead of PNG for thumbnails
+- Use initial format instead of PNG for thumbnails
 
 1.0.3 (*2021-07-13*)
 ~~~~~~~~~~~~~~~~~~~~

__init__.py

@@ -43,7 +43,7 @@ def copy_images_files(app: Sphinx, env: BuildEnvironment) -> None:
             thumbsize = basename.split('-')[-1].split('x')
             thumbsize = [int(size) for size in thumbsize]
             original = '.'.join(basename.split('.')[:-1]) + ext
-            dest = basename + '.jpg'
+            dest = basename + ext
             ensuredir(os.path.dirname(dest))
 
             with Image.open(original) as im:
@@ -68,7 +68,10 @@ def copy_images_files(app: Sphinx, env: BuildEnvironment) -> None:
                         (im.size[1]+thumbsize[0]*im.size[1]/thumbsize[0])//2,
                     ))
 
-                out.save(dest, "JPEG", quality=90)
+                if ext.lower() in ("jpg", "jpeg"):
+                    out.save(dest, "JPEG", quality=90)
+                else:
+                    out.save(dest)
 
 
 def install_static_files(app: Sphinx, env: BuildEnvironment) -> None:

collector.py

@@ -87,7 +87,7 @@ class GalleriaCollector(EnvironmentCollector):
                     basename, ext = os.path.splitext(image_path)
                     thumb_path = basename + ".thumb-" + thumbsize + ext
                     thumb_path_cropped = basename + ".thumb-" + thumbsize
-                    thumb_path_cropped += '.jpg'
+                    thumb_path_cropped += ext
                     if ext.lower() in ('.svg', '.svgz'):
                         thumb_path_cropped = image_path
                         thumb_path = image_path