Added IFD enum to ExifTags

Tests/test_file_jpeg.py

@@ -415,6 +415,13 @@ def test_exif(self):
             info = im._getexif()
             assert info[305] == "Adobe Photoshop CS Macintosh"
 
+    def test_get_child_images(self):
+        with Image.open("Tests/images/flower.jpg") as im:
+            ims = im.get_child_images()
+
+        assert len(ims) == 1
+        assert_image_equal_tofile(ims[0], "Tests/images/flower_thumbnail.png")
+
     def test_mp(self):
         with Image.open("Tests/images/pil_sample_rgb.jpg") as im:
             assert im._getmp() is None

Tests/test_image.py

@@ -7,7 +7,14 @@
 
 import pytest
 
-from PIL import Image, ImageDraw, ImagePalette, UnidentifiedImageError, features
+from PIL import (
+    ExifTags,
+    Image,
+    ImageDraw,
+    ImagePalette,
+    UnidentifiedImageError,
+    features,
+)
 
 from .helper import (
     assert_image_equal,
@@ -808,6 +815,18 @@ def test_exif_interop(self):
             reloaded_exif.load(exif.tobytes())
             assert reloaded_exif.get_ifd(0xA005) == exif.get_ifd(0xA005)
 
+    def test_exif_ifd1(self):
+        with Image.open("Tests/images/flower.jpg") as im:
+            exif = im.getexif()
+            assert exif.get_ifd(ExifTags.IFD.IFD1) == {
+                513: 2036,
+                514: 5448,
+                259: 6,
+                296: 2,
+                282: 180.0,
+                283: 180.0,
+            }
+
     def test_exif_ifd(self):
         with Image.open("Tests/images/flower.jpg") as im:
             exif = im.getexif()

docs/reference/ExifTags.rst

@@ -31,6 +31,13 @@ which provide constants and clear-text names for various well-known EXIF tags.
     >>> Interop(4096).name
     'RelatedImageFileFormat'
 
+.. py:data:: IFD
+
+    >>> from PIL.ExifTags import IFD
+    >>> IFD.Exif.value
+    34665
+    >>> IFD(34665).name
+    'Exif'
 
 Two of these values are also exposed as dictionaries.
 

src/PIL/ExifTags.py

@@ -346,3 +346,11 @@ class Interop(IntEnum):
     RelatedImageFileFormat = 4096
     RelatedImageWidth = 4097
     RleatedImageHeight = 4098
+
+
+class IFD(IntEnum):
+    Exif = 34665
+    GPSInfo = 34853
+    Makernote = 37500
+    Interop = 40965
+    IFD1 = -1

src/PIL/Image.py

@@ -47,7 +47,14 @@
 # VERSION was removed in Pillow 6.0.0.
 # PILLOW_VERSION was removed in Pillow 9.0.0.
 # Use __version__ instead.
-from . import ImageMode, TiffTags, UnidentifiedImageError, __version__, _plugins
+from . import (
+    ExifTags,
+    ImageMode,
+    TiffTags,
+    UnidentifiedImageError,
+    __version__,
+    _plugins,
+)
 from ._binary import i32le, o32be, o32le
 from ._deprecate import deprecate
 from ._util import DeferredError, is_path
@@ -1447,6 +1454,49 @@ def _reload_exif(self):
         self._exif._loaded = False
         self.getexif()
 
+    def get_child_images(self):
+        child_images = []
+        exif = self.getexif()
+        ifds = []
+        if ExifTags.Base.SubIFDs in exif:
+            subifd_offsets = exif[ExifTags.Base.SubIFDs]
+            if subifd_offsets:
+                if not isinstance(subifd_offsets, tuple):
+                    subifd_offsets = (subifd_offsets,)
+                for subifd_offset in subifd_offsets:
+                    ifds.append((exif._get_ifd_dict(subifd_offset), subifd_offset))
+        ifd1 = exif.get_ifd(ExifTags.IFD.IFD1)
+        if ifd1 and ifd1.get(513):
+            ifds.append((ifd1, exif._info.next))
+
+        offset = None
+        for ifd, ifd_offset in ifds:
+            current_offset = self.fp.tell()
+            if offset is None:
+                offset = current_offset
+
+            fp = self.fp
+            thumbnailOffset = ifd.get(513)
+            if thumbnailOffset is not None:
+                try:
+                    thumbnailOffset += self._exif_offset
+                except AttributeError:
+                    pass
+                self.fp.seek(thumbnailOffset)
+                data = self.fp.read(ifd.get(514))
+                fp = io.BytesIO(data)
+
+            with open(fp) as im:
+                if thumbnailOffset is None:
+                    im._frame_pos = [ifd_offset]
+                    im._seek(0)
+                im.load()
+                child_images.append(im)
+
+        if offset is not None:
+            self.fp.seek(offset)
+        return child_images
+
     def getim(self):
         """
         Returns a capsule that points to the internal image memory.
@@ -3598,14 +3648,16 @@ def _get_merged_dict(self):
         merged_dict = dict(self)
 
         # get EXIF extension
-        if 0x8769 in self:
-            ifd = self._get_ifd_dict(self[0x8769])
+        if ExifTags.IFD.Exif in self:
+            ifd = self._get_ifd_dict(self[ExifTags.IFD.Exif])
             if ifd:
                 merged_dict.update(ifd)
 
         # GPS
-        if 0x8825 in self:
-            merged_dict[0x8825] = self._get_ifd_dict(self[0x8825])
+        if ExifTags.IFD.GPSInfo in self:
+            merged_dict[ExifTags.IFD.GPSInfo] = self._get_ifd_dict(
+                self[ExifTags.IFD.GPSInfo]
+            )
 
         return merged_dict
 
@@ -3615,31 +3667,34 @@ def tobytes(self, offset=8):
         head = self._get_head()
         ifd = TiffImagePlugin.ImageFileDirectory_v2(ifh=head)
         for tag, value in self.items():
-            if tag in [0x8769, 0x8225, 0x8825] and not isinstance(value, dict):
+            if tag in [
+                ExifTags.IFD.Exif,
+                ExifTags.IFD.GPSInfo,
+            ] and not isinstance(value, dict):
                 value = self.get_ifd(tag)
                 if (
-                    tag == 0x8769
-                    and 0xA005 in value
-                    and not isinstance(value[0xA005], dict)
+                    tag == ExifTags.IFD.Exif
+                    and ExifTags.IFD.Interop in value
+                    and not isinstance(value[ExifTags.IFD.Interop], dict)
                 ):
                     value = value.copy()
-                    value[0xA005] = self.get_ifd(0xA005)
+                    value[ExifTags.IFD.Interop] = self.get_ifd(ExifTags.IFD.Interop)
             ifd[tag] = value
         return b"Exif\x00\x00" + head + ifd.tobytes(offset)
 
     def get_ifd(self, tag):
         if tag not in self._ifds:
-            if tag in [0x8769, 0x8825]:
-                # exif, gpsinfo
+            if tag == ExifTags.IFD.IFD1:
+                if self._info is not None:
+                    self._ifds[tag] = self._get_ifd_dict(self._info.next)
+            elif tag in [ExifTags.IFD.Exif, ExifTags.IFD.GPSInfo]:
                 if tag in self:
                     self._ifds[tag] = self._get_ifd_dict(self[tag])
-            elif tag in [0xA005, 0x927C]:
-                # interop, makernote
-                if 0x8769 not in self._ifds:
-                    self.get_ifd(0x8769)
-                tag_data = self._ifds[0x8769][tag]
-                if tag == 0x927C:
-                    # makernote
+            elif tag in [ExifTags.IFD.Interop, ExifTags.IFD.Makernote]:
+                if ExifTags.IFD.Exif not in self._ifds:
+                    self.get_ifd(ExifTags.IFD.Exif)
+                tag_data = self._ifds[ExifTags.IFD.Exif][tag]
+                if tag == ExifTags.IFD.Makernote:
                     from .TiffImagePlugin import ImageFileDirectory_v2
 
                     if tag_data[:8] == b"FUJIFILM":
@@ -3715,7 +3770,7 @@ def get_ifd(self, tag):
                                 makernote = {0x1101: dict(self._fixup_dict(camerainfo))}
                         self._ifds[tag] = makernote
                 else:
-                    # interop
+                    # Interop
                     self._ifds[tag] = self._get_ifd_dict(tag_data)
         return self._ifds.get(tag, {})
 

src/PIL/JpegImagePlugin.py

@@ -89,6 +89,7 @@ def APP(self, marker):
         if "exif" not in self.info:
             # extract EXIF information (incomplete)
             self.info["exif"] = s  # FIXME: value will change
+            self._exif_offset = self.fp.tell() - n + 6
     elif marker == 0xFFE2 and s[:5] == b"FPXR\0":
         # extract FlashPix information (incomplete)
         self.info["flashpix"] = s  # FIXME: value will change

src/PIL/MpoImagePlugin.py

@@ -22,7 +22,14 @@
 import os
 import struct
 
-from . import Image, ImageFile, ImageSequence, JpegImagePlugin, TiffImagePlugin
+from . import (
+    ExifTags,
+    Image,
+    ImageFile,
+    ImageSequence,
+    JpegImagePlugin,
+    TiffImagePlugin,
+)
 from ._binary import i16be as i16
 from ._binary import o32le
 
@@ -137,7 +144,7 @@ def seek(self, frame):
 
             mptype = self.mpinfo[0xB002][frame]["Attribute"]["MPType"]
             if mptype.startswith("Large Thumbnail"):
-                exif = self.getexif().get_ifd(0x8769)
+                exif = self.getexif().get_ifd(ExifTags.IFD.Exif)
                 if 40962 in exif and 40963 in exif:
                     self._size = (exif[40962], exif[40963])
         elif "exif" in self.info:

src/PIL/TiffImagePlugin.py

@@ -1153,39 +1153,6 @@ def tell(self):
         """Return the current frame number"""
         return self.__frame
 
-    def get_child_images(self):
-        if SUBIFD not in self.tag_v2:
-            return []
-        child_images = []
-        exif = self.getexif()
-        offset = None
-        for im_offset in self.tag_v2[SUBIFD]:
-            # reset buffered io handle in case fp
-            # was passed to libtiff, invalidating the buffer
-            current_offset = self._fp.tell()
-            if offset is None:
-                offset = current_offset
-
-            fp = self._fp
-            ifd = exif._get_ifd_dict(im_offset)
-            jpegInterchangeFormat = ifd.get(513)
-            if jpegInterchangeFormat is not None:
-                fp.seek(jpegInterchangeFormat)
-                jpeg_data = fp.read(ifd.get(514))
-
-                fp = io.BytesIO(jpeg_data)
-
-            with Image.open(fp) as im:
-                if jpegInterchangeFormat is None:
-                    im._frame_pos = [im_offset]
-                    im._seek(0)
-                im.load()
-                child_images.append(im)
-
-        if offset is not None:
-            self._fp.seek(offset)
-        return child_images
-
     def getxmp(self):
         """
         Returns a dictionary containing the XMP tags.