Fix incorrect hint about having too many subtitle lines in some cases (#2546).

[dcpomatic.git] / src / lib / hints.cc

diff --git a/src/lib/hints.cc b/src/lib/hints.cc
index b628efc31534fd53be7c7c8d29350ceab88363c3..6c574d9916b85ede608e424cdfeccbc9f7134533 100644 (file)
--- a/src/lib/hints.cc
+++ b/src/lib/hints.cc
@@ -584,7 +584,30 @@ Hints::open_subtitle (PlayerText text, DCPTimePeriod period)
                hint (_("At least one of your subtitles starts less than 2 frames after the previous one.  It is advisable to make the gap between subtitles at least 2 frames."));
        }
 
-       if (text.string.size() > 3 && !_too_many_subtitle_lines) {
+       struct VPos
+       {
+       public:
+               dcp::VAlign align;
+               float position;
+
+               bool operator<(VPos const& other) const {
+                       if (static_cast<int>(align) != static_cast<int>(other.align)) {
+                               return static_cast<int>(align) < static_cast<int>(other.align);
+                       }
+                       return position < other.position;
+               }
+       };
+
+       /* This is rather an approximate way to count distinct lines, but I guess it will do;
+        * to make it better we need to take into account font metrics, and the SMPTE alignment
+        * debacle, and so on.
+        */
+       std::set<VPos> lines;
+       for (auto const& line: text.string) {
+               lines.insert({ line.v_align(), line.v_position() });
+       }
+
+       if (lines.size() > 3 && !_too_many_subtitle_lines) {
                _too_many_subtitle_lines = true;
                hint (_("At least one of your subtitles has more than 3 lines.  It is advisable to use no more than 3 lines."));
        }