Merge pull request #5611 from radarhere/apng_info

Tests/test_file_apng.py

@@ -441,6 +441,12 @@ def test_apng_save_duration_loop(tmp_path):
         assert im.n_frames == 1
         assert im.info.get("duration") == 750
 
+    # test info duration
+    frame.info["duration"] = 750
+    frame.save(test_file, save_all=True)
+    with Image.open(test_file) as im:
+        assert im.info.get("duration") == 750
+
 
 def test_apng_save_disposal(tmp_path):
     test_file = str(tmp_path / "temp.png")
@@ -531,6 +537,17 @@ def test_apng_save_disposal(tmp_path):
         assert im.getpixel((0, 0)) == (0, 255, 0, 255)
         assert im.getpixel((64, 32)) == (0, 255, 0, 255)
 
+    # test info disposal
+    red.info["disposal"] = PngImagePlugin.APNG_DISPOSE_OP_BACKGROUND
+    red.save(
+        test_file,
+        save_all=True,
+        append_images=[Image.new("RGBA", (10, 10), (0, 255, 0, 255))],
+    )
+    with Image.open(test_file) as im:
+        im.seek(1)
+        assert im.getpixel((64, 32)) == (0, 0, 0, 0)
+
 
 def test_apng_save_disposal_previous(tmp_path):
     test_file = str(tmp_path / "temp.png")
@@ -611,3 +628,10 @@ def test_apng_save_blend(tmp_path):
         im.seek(2)
         assert im.getpixel((0, 0)) == (0, 255, 0, 255)
         assert im.getpixel((64, 32)) == (0, 255, 0, 255)
+
+    # test info blend
+    red.info["blend"] = PngImagePlugin.APNG_BLEND_OP_OVER
+    red.save(test_file, save_all=True, append_images=[green, transparent])
+    with Image.open(test_file) as im:
+        im.seek(2)
+        assert im.getpixel((0, 0)) == (0, 255, 0, 255)

src/PIL/PngImagePlugin.py

@@ -1061,8 +1061,10 @@ def _write_multiple_frames(im, fp, chunk, rawmode):
     default_image = im.encoderinfo.get("default_image", im.info.get("default_image"))
     duration = im.encoderinfo.get("duration", im.info.get("duration", 0))
     loop = im.encoderinfo.get("loop", im.info.get("loop", 0))
-    disposal = im.encoderinfo.get("disposal", im.info.get("disposal"))
+    disposal = im.encoderinfo.get(
-    blend = im.encoderinfo.get("blend", im.info.get("blend"))
+        "disposal", im.info.get("disposal", APNG_DISPOSE_OP_NONE)
+    )
+    blend = im.encoderinfo.get("blend", im.info.get("blend", APNG_BLEND_OP_SOURCE))
 
     if default_image:
         chain = itertools.chain(im.encoderinfo.get("append_images", []))
@@ -1117,12 +1119,8 @@ def _write_multiple_frames(im, fp, chunk, rawmode):
                     and prev_disposal == encoderinfo.get("disposal")
                     and prev_blend == encoderinfo.get("blend")
                 ):
-                    frame_duration = encoderinfo.get("duration", 0)
+                    if isinstance(duration, (list, tuple)):
-                    if frame_duration:
+                        previous["encoderinfo"]["duration"] += encoderinfo["duration"]
-                        if "duration" in previous["encoderinfo"]:
-                            previous["encoderinfo"]["duration"] += frame_duration
-                        else:
-                            previous["encoderinfo"]["duration"] = frame_duration
                     continue
             else:
                 bbox = None
@@ -1149,9 +1147,10 @@ def _write_multiple_frames(im, fp, chunk, rawmode):
             bbox = frame_data["bbox"]
             im_frame = im_frame.crop(bbox)
         size = im_frame.size
-        duration = int(round(frame_data["encoderinfo"].get("duration", 0)))
+        encoderinfo = frame_data["encoderinfo"]
-        disposal = frame_data["encoderinfo"].get("disposal", APNG_DISPOSE_OP_NONE)
+        frame_duration = int(round(encoderinfo.get("duration", duration)))
-        blend = frame_data["encoderinfo"].get("blend", APNG_BLEND_OP_SOURCE)
+        frame_disposal = encoderinfo.get("disposal", disposal)
+        frame_blend = encoderinfo.get("blend", blend)
         # frame control
         chunk(
             fp,
@@ -1161,10 +1160,10 @@ def _write_multiple_frames(im, fp, chunk, rawmode):
             o32(size[1]),  # height
             o32(bbox[0]),  # x_offset
             o32(bbox[1]),  # y_offset
-            o16(duration),  # delay_numerator
+            o16(frame_duration),  # delay_numerator
             o16(1000),  # delay_denominator
-            o8(disposal),  # dispose_op
+            o8(frame_disposal),  # dispose_op
-            o8(blend),  # blend_op
+            o8(frame_blend),  # blend_op
         )
         seq_num += 1
         # frame data