Find 3:2 pullback when searching for matching resolutions

1 files changed, 45 insertions, 5 deletions

diff --git a/xbmc/windowing/Resolution.cpp b/xbmc/windowing/Resolution.cpp
index 8efa7d2ba9..1921dd260e 100644
--- a/xbmc/windowing/Resolution.cpp
+++ b/xbmc/windowing/Resolution.cpp
@@ -105,7 +105,7 @@ void CResolutionUtils::FindResolutionFromWhitelist(float fps, int width, int hei
 
   CLog::Log(LOGDEBUG, "Trying to find exact refresh rate");
 
-  for (const auto &mode : indexList)
+  for (const auto& mode : indexList)
   {
     auto i = CDisplaySettings::GetInstance().GetResFromString(mode.asString());
     const RESOLUTION_INFO info = CServiceBroker::GetWinSystem()->GetGfxContext().GetResInfo(i);
@@ -125,7 +125,7 @@ void CResolutionUtils::FindResolutionFromWhitelist(float fps, int width, int hei
 
   CLog::Log(LOGDEBUG, "No exact whitelisted resolution matched, trying double refresh rate");
 
-  for (const auto &mode : indexList)
+  for (const auto& mode : indexList)
   {
     auto i = CDisplaySettings::GetInstance().GetResFromString(mode.asString());
     const RESOLUTION_INFO info = CServiceBroker::GetWinSystem()->GetGfxContext().GetResInfo(i);
@@ -143,11 +143,33 @@ void CResolutionUtils::FindResolutionFromWhitelist(float fps, int width, int hei
     }
   }
 
+  CLog::Log(LOGDEBUG, "No double whitelisted resolution matched, trying 3:2 pullback");
+
+  for (const auto& mode : indexList)
+  {
+    auto i = CDisplaySettings::GetInstance().GetResFromString(mode.asString());
+    const RESOLUTION_INFO info = CServiceBroker::GetWinSystem()->GetGfxContext().GetResInfo(i);
+
+    // allow resolutions that are exact and have 2.5 times the refresh rate
+    // allow macroblock alignement / padding errors (e.g. 1080 mod16 == 8)
+    if (((height == info.iScreenHeight && width <= info.iScreenWidth + 8) ||
+         (width == info.iScreenWidth && height <= info.iScreenHeight + 8)) &&
+        (info.dwFlags & D3DPRESENTFLAG_MODEMASK) == (curr.dwFlags & D3DPRESENTFLAG_MODEMASK) &&
+        MathUtils::FloatEquals(info.fRefreshRate, fps * 2.5f, 0.01f))
+    {
+      CLog::Log(LOGDEBUG, "Matched fuzzy whitelisted Resolution %s (%d)", info.strMode.c_str(), i);
+      resolution = i;
+      return;
+    }
+  }
+
   CLog::Log(LOGDEBUG, "No double refresh rate whitelisted resolution matched, trying current resolution");
 
   if (width <= curr.iScreenWidth
     && height <= curr.iScreenHeight
-    && (MathUtils::FloatEquals(curr.fRefreshRate, fps, 0.01f) || MathUtils::FloatEquals(curr.fRefreshRate, fps * 2, 0.01f)))
+    && (MathUtils::FloatEquals(curr.fRefreshRate, fps, 0.01f)
+      || MathUtils::FloatEquals(curr.fRefreshRate, fps * 2, 0.01f)
+      || MathUtils::FloatEquals(curr.fRefreshRate, fps * 2.5f, 0.01f)))
   {
     CLog::Log(LOGDEBUG, "Matched current Resolution %s (%d)", curr.strMode.c_str(), resolution);
     return;
@@ -157,7 +179,7 @@ void CResolutionUtils::FindResolutionFromWhitelist(float fps, int width, int hei
 
   const RESOLUTION_INFO desktop_info = CServiceBroker::GetWinSystem()->GetGfxContext().GetResInfo(CDisplaySettings::GetInstance().GetCurrentResolution());
 
-  for (const auto &mode : indexList)
+  for (const auto& mode : indexList)
   {
     auto i = CDisplaySettings::GetInstance().GetResFromString(mode.asString());
     const RESOLUTION_INFO info = CServiceBroker::GetWinSystem()->GetGfxContext().GetResInfo(i);
@@ -175,7 +197,7 @@ void CResolutionUtils::FindResolutionFromWhitelist(float fps, int width, int hei
 
   CLog::Log(LOGDEBUG, "Default resolution doesn't provide reqired refreshrate, trying default resolution with double refreshrate");
 
-  for (const auto &mode : indexList)
+  for (const auto& mode : indexList)
   {
     auto i = CDisplaySettings::GetInstance().GetResFromString(mode.asString());
     const RESOLUTION_INFO info = CServiceBroker::GetWinSystem()->GetGfxContext().GetResInfo(i);
@@ -191,6 +213,24 @@ void CResolutionUtils::FindResolutionFromWhitelist(float fps, int width, int hei
     }
   }
 
+  CLog::Log(LOGDEBUG, "Default resolution doesn't provide reqired refreshrate, trying default resolution with 3:2 pullback");
+
+  for (const auto& mode : indexList)
+  {
+    auto i = CDisplaySettings::GetInstance().GetResFromString(mode.asString());
+    const RESOLUTION_INFO info = CServiceBroker::GetWinSystem()->GetGfxContext().GetResInfo(i);
+
+    // allow resolutions that are desktop resolution but have 2.5 times the refresh rate
+    if (info.iScreenWidth == desktop_info.iScreenWidth &&
+        (info.dwFlags & D3DPRESENTFLAG_MODEMASK) == (desktop_info.dwFlags & D3DPRESENTFLAG_MODEMASK) &&
+        MathUtils::FloatEquals(info.fRefreshRate, fps * 2.5f, 0.01f))
+    {
+      CLog::Log(LOGDEBUG, "Matched fuzzy whitelisted Resolution %s (%d)", info.strMode.c_str(), i);
+      resolution = i;
+      return;
+    }
+  }
+
   CLog::Log(LOGDEBUG, "No whitelisted resolution matched");
 }