fix: correct fx resize behavior

.gitignore

@@ -3,6 +3,7 @@
 /data
 /pyrightconfig.json
 /pyrightconfig.toml
+/uv.lock
 
 # 缓存文件
 __pycache__

konabot/plugins/fx_process/fx_handle.py

@@ -194,23 +194,27 @@ class ImageFilterImplement:
     # 缩放
     @staticmethod
     def apply_resize(image: Image.Image, scale: float = 1.5, scale_y = None) -> Image.Image:
-        # scale 可以为负
-        # 如果 scale 为负，则代表翻转
-        if scale_y is not None:
-            if float(scale_y) < 0:
+        scale_x = float(scale)
+        scale_y_value = float(scale_y) if scale_y is not None else None
+
+        if scale_y_value is not None:
+            if scale_y_value < 0:
                 image = ImageOps.flip(image)
-                scale_y = abs(float(scale_y))
-            if scale < 0:
+                scale_y_value = abs(scale_y_value)
+            if scale_x < 0:
                 image = ImageOps.mirror(image)
-                scale = abs(scale)
-            new_size = (int(image.width * scale), int(image.height * float(scale_y)))
-            return image.resize(new_size, Image.Resampling.LANCZOS)
-        if scale < 0:
+                scale_x = abs(scale_x)
+            target_scale_y = scale_y_value
+        else:
+            if scale_x < 0:
                 image = ImageOps.mirror(image)
                 image = ImageOps.flip(image)
-            scale = abs(scale)
-        new_size = (int(image.width * scale), int(image.height * scale))
-        return image.resize(new_size, Image.Resampling.LANCZOS)
+                scale_x = abs(scale_x)
+            target_scale_y = scale_x
+
+        new_width = max(1, round(image.width * scale_x))
+        new_height = max(1, round(image.height * target_scale_y))
+        return image.resize((new_width, new_height), Image.Resampling.LANCZOS)
     
     # 波纹
     @staticmethod

tests/test_fx_process.py

@@ -35,3 +35,39 @@ def test_apply_jpeg_damage_clamps_quality_range():
     assert high.size == image.size
     assert low.mode == "RGBA"
     assert high.mode == "RGBA"
+
+
+def test_apply_resize_clamps_small_result_to_at_least_one_pixel():
+    image = Image.new("RGBA", (10, 10), (255, 0, 0, 255))
+
+    result = ImageFilterImplement.apply_resize(image, 0.01)
+
+    assert result.size == (1, 1)
+
+
+def test_apply_resize_negative_x_with_positive_y_only_mirrors_horizontally():
+    image = Image.new("RGBA", (2, 1))
+    image.putpixel((0, 0), (255, 0, 0, 255))
+    image.putpixel((1, 0), (0, 0, 255, 255))
+
+    result = ImageFilterImplement.apply_resize(image, -1, 1)
+
+    assert result.size == (2, 1)
+    assert result.getpixel((0, 0)) == (0, 0, 255, 255)
+    assert result.getpixel((1, 0)) == (255, 0, 0, 255)
+
+
+def test_apply_resize_negative_scale_without_y_flips_both_axes():
+    image = Image.new("RGBA", (2, 2))
+    image.putpixel((0, 0), (255, 0, 0, 255))
+    image.putpixel((1, 0), (0, 255, 0, 255))
+    image.putpixel((0, 1), (0, 0, 255, 255))
+    image.putpixel((1, 1), (255, 255, 0, 255))
+
+    result = ImageFilterImplement.apply_resize(image, -1)
+
+    assert result.size == (2, 2)
+    assert result.getpixel((0, 0)) == (255, 255, 0, 255)
+    assert result.getpixel((1, 0)) == (0, 0, 255, 255)
+    assert result.getpixel((0, 1)) == (0, 255, 0, 255)
+    assert result.getpixel((1, 1)) == (255, 0, 0, 255)