diff --git a/src/mode.c b/src/mode.c
index 8db36e3..d4f9f7e 100644
--- a/src/mode.c
+++ b/src/mode.c
@@ -208,6 +208,19 @@ mp_pixel_format_width_to_bytes(MPPixelFormat pixel_format, uint32_t width)
         return (bits_per_width + 8 - remainder) / 8;
 }
 
+uint32_t
+mp_pixel_format_width_to_padding(MPPixelFormat pixel_format, uint32_t width)
+{
+        uint64_t bytes_per_width =
+                mp_pixel_format_width_to_bytes(pixel_format, width);
+
+        uint64_t remainder = bytes_per_width % 8;
+        if (remainder == 0)
+                return remainder;
+
+        return 8 - remainder;
+}
+
 uint32_t
 mp_pixel_format_width_to_colors(MPPixelFormat pixel_format, uint32_t width)
 {
diff --git a/src/mode.h b/src/mode.h
index f3e5a5b..6cdfb7a 100644
--- a/src/mode.h
+++ b/src/mode.h
@@ -33,6 +33,8 @@ uint32_t mp_pixel_format_pixel_depth(MPPixelFormat pixel_format);
 const char *mp_pixel_format_cfa(MPPixelFormat pixel_format);
 const char *mp_pixel_format_cfa_pattern(MPPixelFormat pixel_format);
 uint32_t mp_pixel_format_width_to_bytes(MPPixelFormat pixel_format, uint32_t width);
+uint32_t mp_pixel_format_width_to_padding(MPPixelFormat pixel_format,
+                                          uint32_t width);
 uint32_t mp_pixel_format_width_to_colors(MPPixelFormat pixel_format, uint32_t width);
 uint32_t mp_pixel_format_height_to_colors(MPPixelFormat pixel_format,
                                           uint32_t height);