Prevent G.fileflags changes when WM_OT_save_mainfile() is called from script

This is to solve an issue where a blend file could be compressed
unbeknownst to the artist. This happened in the following situtation:

- Artist edits an uncompressed blend file.
- Some script saves a compressed blendfile to a separate location.
- When the artist saves the file (s)he is editing (File>Save, or Ctrl+S),
  it was silently compressed.

Cherry pick from: cd3b313d5f44a10a1150bf1ddb560775d1bcd827

1 files changed, 23 insertions, 11 deletions

diff --git a/source/blender/windowmanager/intern/wm_files.c b/source/blender/windowmanager/intern/wm_files.c
index 6182a8c5ec6..87ca7310971 100644
--- a/source/blender/windowmanager/intern/wm_files.c
+++ b/source/blender/windowmanager/intern/wm_files.c
@@ -1128,12 +1128,12 @@ bool write_crash_blend(void)
 /**
  * \see #wm_homefile_write_exec wraps #BLO_write_file in a similar way.
  */
-static int wm_file_write(bContext *C, const char *filepath, int fileflags, ReportList *reports)
+static bool wm_file_write(bContext *C, const char *filepath, int fileflags, ReportList *reports)
 {
 	Main *bmain = CTX_data_main(C);
 	Library *li;
 	int len;
-	int ret = -1;
+	int ok = false;
 	BlendThumbnail *thumb, *main_thumb;
 	ImBuf *ibuf_thumb = NULL;
 
@@ -1141,18 +1141,18 @@ static int wm_file_write(bContext *C, const char *filepath, int fileflags, Repor
 
 	if (len == 0) {
 		BKE_report(reports, RPT_ERROR, "Path is empty, cannot save");
-		return ret;
+		return ok;
 	}
 
 	if (len >= FILE_MAX) {
 		BKE_report(reports, RPT_ERROR, "Path too long, cannot save");
-		return ret;
+		return ok;
 	}
 
 	/* Check if file write permission is ok */
 	if (BLI_exists(filepath) && !BLI_file_is_writable(filepath)) {
 		BKE_reportf(reports, RPT_ERROR, "Cannot save blend file, path '%s' is not writable", filepath);
-		return ret;
+		return ok;
 	}
 
 	/* note: used to replace the file extension (to ensure '.blend'),
@@ -1163,7 +1163,7 @@ static int wm_file_write(bContext *C, const char *filepath, int fileflags, Repor
 	for (li = bmain->library.first; li; li = li->id.next) {
 		if (BLI_path_cmp(li->filepath, filepath) == 0) {
 			BKE_reportf(reports, RPT_ERROR, "Cannot overwrite used library '%.240s'", filepath);
-			return ret;
+			return ok;
 		}
 	}
 
@@ -1226,7 +1226,8 @@ static int wm_file_write(bContext *C, const char *filepath, int fileflags, Repor
 			ibuf_thumb = IMB_thumb_create(filepath, THB_LARGE, THB_SOURCE_BLEND, ibuf_thumb);
 		}
 
-		ret = 0;  /* Success. */
+		/* Success. */
+		ok = true;
 	}
 
 	if (ibuf_thumb) {
@@ -1238,7 +1239,7 @@ static int wm_file_write(bContext *C, const char *filepath, int fileflags, Repor
 
 	WM_cursor_wait(0);
 
-	return ret;
+	return ok;
 }
 
 /************************ autosave ****************************/
@@ -1415,6 +1416,7 @@ void WM_file_tag_modified(void)
 
 /**
  * \see #wm_file_write wraps #BLO_write_file in a similar way.
+ * \return success.
  */
 static int wm_homefile_write_exec(bContext *C, wmOperator *op)
 {
@@ -2092,7 +2094,6 @@ static int wm_save_as_mainfile_exec(bContext *C, wmOperator *op)
 {
 	Main *bmain = CTX_data_main(C);
 	char path[FILE_MAX];
-	int fileflags;
 	const bool is_save_as = (op->type->invoke == wm_save_as_mainfile_invoke);
 
 	save_set_compress(op);
@@ -2105,7 +2106,8 @@ static int wm_save_as_mainfile_exec(bContext *C, wmOperator *op)
 		wm_filepath_default(path);
 	}
 
-	fileflags = G.fileflags & ~G_FILE_USERPREFS;
+	const int fileflags_orig = G.fileflags;
+	int fileflags = G.fileflags & ~G_FILE_USERPREFS;
 
 	/* set compression flag */
 	SET_FLAG_FROM_TEST(
@@ -2120,8 +2122,18 @@ static int wm_save_as_mainfile_exec(bContext *C, wmOperator *op)
 	         RNA_boolean_get(op->ptr, "copy")),
 	        G_FILE_SAVE_COPY);
 
-	if (wm_file_write(C, path, fileflags, op->reports) != 0)
+	const bool ok = wm_file_write(C, path, fileflags, op->reports);
+
+	if ((op->flag & OP_IS_INVOKE) == 0) {
+		/* OP_IS_INVOKE is set when the operator is called from the GUI.
+		 * If it is not set, the operator is called from a script and
+		 * shouldn't influence G.fileflags. */
+		G.fileflags = fileflags_orig;
+	}
+
+	if (ok == false) {
 		return OPERATOR_CANCELLED;
+	}
 
 	WM_event_add_notifier(C, NC_WM | ND_FILESAVE, NULL);