[host] d12: implement hdr16 to hdr10 conversion

common/include/common/display.h

@@ -0,0 +1,32 @@
+/**
+ * Looking Glass
+ * Copyright © 2017-2024 The Looking Glass Authors
+ * https://looking-glass.io
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef _H_COMMON_DISPLAY_
+#define _H_COMMON_DISPLAY_
+
+#if defined(_WIN32)
+#include <windows.h>
+#include <stdbool.h>
+
+bool display_getPathInfo(HMONITOR monitor, DISPLAYCONFIG_PATH_INFO * info);
+float display_getSDRWhiteLevel(const DISPLAYCONFIG_PATH_INFO * displayPathInfo);
+#endif
+
+#endif

common/src/platform/windows/CMakeLists.txt

@@ -39,6 +39,7 @@ add_library(lg_common_platform_code STATIC
   ivshmem.c
   time.c
   cpuinfo.c
+  display.c
 )
 
 target_link_libraries(lg_common_platform_code

common/src/platform/windows/display.c

@@ -0,0 +1,120 @@
+/**
+ * Looking Glass
+ * Copyright © 2017-2024 The Looking Glass Authors
+ * https://looking-glass.io
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "common/display.h"
+#include "common/debug.h"
+
+bool display_getPathInfo(HMONITOR monitor, DISPLAYCONFIG_PATH_INFO * info)
+{
+  bool result = false;
+  UINT32 numPath, numMode;
+
+  MONITORINFOEXW viewInfo = { .cbSize = sizeof(viewInfo) };
+    if (!GetMonitorInfoW(monitor, (MONITORINFO*)&viewInfo))
+  {
+    DEBUG_ERROR("Failed to get the monitor info");
+    goto err;
+  }
+
+err_retry:
+  if (FAILED(GetDisplayConfigBufferSizes(QDC_ONLY_ACTIVE_PATHS, &numPath, &numMode)))
+    goto err;
+
+  DISPLAYCONFIG_PATH_INFO * pathInfo = calloc(sizeof(*pathInfo), numPath);
+  if (!pathInfo)
+    goto err_mem_pathInfo;
+
+  DISPLAYCONFIG_MODE_INFO * modeInfo = calloc(sizeof(*modeInfo), numMode);
+  if (!modeInfo)
+    goto err_mem_modeInfo;
+
+  LONG status = QueryDisplayConfig(QDC_ONLY_ACTIVE_PATHS,
+    &numPath, pathInfo,
+    &numMode, modeInfo,
+    NULL);
+
+  if (status != ERROR_SUCCESS)
+  {
+    if (status == ERROR_INSUFFICIENT_BUFFER)
+    {
+      free(modeInfo);
+      free(pathInfo);
+      goto err_retry;
+    }
+
+    DEBUG_ERROR("QueryDisplayConfig failed with 0x%lx", status);
+    goto err_queryDisplay;
+  }
+
+  for(unsigned i = 0; i < numPath; ++i)
+  {
+    DISPLAYCONFIG_SOURCE_DEVICE_NAME sourceName =
+    {
+      .header =
+      {
+        .type      = DISPLAYCONFIG_DEVICE_INFO_GET_SOURCE_NAME,
+        .size      = sizeof(sourceName),
+        .adapterId = pathInfo[i].sourceInfo.adapterId,
+        .id        = pathInfo[i].sourceInfo.id,
+      }
+    };
+
+    if (FAILED(DisplayConfigGetDeviceInfo(&sourceName.header)))
+      continue;
+
+    if (wcscmp(viewInfo.szDevice, sourceName.viewGdiDeviceName) != 0)
+      continue;
+
+    *info = pathInfo[i];
+    result = true;
+    break;
+  }
+
+err_queryDisplay:
+  free(modeInfo);
+
+err_mem_modeInfo:
+  free(pathInfo);
+
+err_mem_pathInfo:
+
+err:
+  return result;
+}
+
+float display_getSDRWhiteLevel(const DISPLAYCONFIG_PATH_INFO * displayPathInfo)
+{
+  float nits = 80.0f;
+  DISPLAYCONFIG_SDR_WHITE_LEVEL level =
+  {
+    .header =
+    {
+      .type      = DISPLAYCONFIG_DEVICE_INFO_GET_SDR_WHITE_LEVEL,
+      .size      = sizeof(level),
+      .adapterId = displayPathInfo->targetInfo.adapterId,
+      .id        = displayPathInfo->targetInfo.id,
+    }
+  };
+
+  if (SUCCEEDED(DisplayConfigGetDeviceInfo(&level.header)))
+    nits = level.SDRWhiteLevel / 1000.0f * 80.0f;
+
+  return nits;
+}