Fix wrong rendering on greyscale images with index colorspace

third_party/libopenjpeg20/0007-jp2_read_cmap.patch

Index: third_party/libopenjpeg20/0007-jp2_read_cmap.patch
diff --git a/third_party/libopenjpeg20/0007-jp2_read_cmap.patch b/third_party/libopenjpeg20/0007-jp2_read_cmap.patch
new file mode 100644
index 0000000000000000000000000000000000000000..30f9e4b2d7a2f6c9ee9fd65c05dd966f551a08ec
--- /dev/null
+++ b/third_party/libopenjpeg20/0007-jp2_read_cmap.patch
@@ -0,0 +1,13 @@
+diff --git a/third_party/libopenjpeg20/jp2.c b/third_party/libopenjpeg20/jp2.c
+index 6e910a9..f3baca5 100644
+--- a/third_party/libopenjpeg20/jp2.c
++++ b/third_party/libopenjpeg20/jp2.c
+@@ -1194,7 +1194,7 @@ static OPJ_BOOL opj_jp2_read_cmap(	opj_jp2_t * jp2,
+ 
+ 
+ 	for(i = 0; i < nr_channels; ++i) {
+-		opj_read_bytes(p_cmap_header_data, &l_value, 2);			/* CMP^i */
++		opj_read_bytes_BE(p_cmap_header_data, &l_value, 2);			/* CMP^i */
+ 		p_cmap_header_data +=2;
+ 		cmap[i].cmp = (OPJ_UINT16) l_value;
+