From: Eli Zaretskii <eliz@gnu.org>
Date: Thu, 16 Apr 2020 09:52:35 +0000 (+0300)
Subject: ; * src/w32image.c (w32_select_active_frame): Comment about GUID values.
X-Git-Tag: emacs-28.0.90~7576
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=82c1d150938b38435c0ae9aa921d7c2739ed200c;p=emacs.git

; * src/w32image.c (w32_select_active_frame): Comment about GUID values.
---

diff --git a/src/w32image.c b/src/w32image.c
index 80c3247e97d..0a2a55d3f6f 100644
--- a/src/w32image.c
+++ b/src/w32image.c
@@ -283,6 +283,11 @@ w32_select_active_frame (GpBitmap *pBitmap, int frame, int *nframes,
   *delay = 0.0;
   if (count)
     {
+      /* The following call will fill pDimensionIDs[0] with the
+	 FrameDimensionTime GUID for GIF images, and
+	 FrameDimensionPage GUID for other image types.  Multi-page
+	 GIF and TIFF images expect these values in the
+	 GdipImageSelectActiveFrame call below.  */
       status = GdipImageGetFrameDimensionsList (pBitmap, pDimensionIDs, 1);
       status = GdipImageGetFrameCount (pBitmap, &pDimensionIDs[0], &frameCount);
       if (status == Ok && frameCount > 1)