Initial release

vm/progress-gate.c

@@ -0,0 +1,53 @@
+#include <math.h>
+
+#include "progress-gate.h"
+
+void
+progress_gate_init (ProgressGate * g)
+{
+  g->has_navigated = false;
+  g->saw_below_100 = false;
+  g->last_sent = -1;
+}
+
+void
+progress_gate_navigated (ProgressGate * g)
+{
+  g->has_navigated = true;
+  g->saw_below_100 = false;
+  g->last_sent = -1;
+}
+
+int
+progress_gate_feed (ProgressGate * g, double value)
+{
+  if (!isfinite (value))
+    return -1;
+
+  /* Floor, not round: 99.6 % is not loaded. */
+  int v = value <= 0 ? 0 : value >= 100 ? 100 : (int) floor (value);
+
+  if (!g->has_navigated)
+    return -1;
+
+  /* A drop means a new load started. */
+  if (g->last_sent >= 0 && v < g->last_sent) {
+    g->saw_below_100 = true;
+    g->last_sent = v;
+    return v;
+  }
+
+  /* A 100 before any lower value is the previous page finishing. */
+  if (v < 100)
+    g->saw_below_100 = true;
+
+  if (v == 100) {
+    if (!g->saw_below_100 || g->last_sent == 100)
+      return -1;
+  } else if (g->last_sent >= 0 && v < g->last_sent + 5) {
+    return -1;
+  }
+
+  g->last_sent = v;
+  return v;
+}