Fix T45823: PSD files save as JPG without warning

Don't allow image save (which overwrites without asking),
unless the input format can be written to.

1 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/editors/space_image/image_ops.c b/source/blender/editors/space_image/image_ops.c
index db0fc2d34b6..3c5aff4d698 100644
--- a/source/blender/editors/space_image/image_ops.c
+++ b/source/blender/editors/space_image/image_ops.c
@@ -176,6 +176,14 @@ static int image_not_packed_poll(bContext *C)
 	return false;
 }
 
+static bool imbuf_format_writeable(const ImBuf *ibuf)
+{
+	ImageFormatData im_format;
+	ImbFormatOptions options_dummy;
+	BKE_imbuf_to_image_format(&im_format, ibuf);
+	return (BKE_image_imtype_to_ftype(im_format.imtype, &options_dummy) == ibuf->ftype);
+}
+
 static int space_image_file_exists_poll(bContext *C)
 {
 	if (space_image_buffer_exists_poll(C)) {
@@ -197,6 +205,9 @@ static int space_image_file_exists_poll(bContext *C)
 			else if (!BLI_file_is_writable(name)) {
 				CTX_wm_operator_poll_msg_set(C, "image path can't be written to");
 			}
+			else if (!imbuf_format_writeable(ibuf)) {
+				CTX_wm_operator_poll_msg_set(C, "image format is read-only");
+			}
 			else {
 				ret = true;
 			}