# HG changeset patch
# User Chris Cannam
# Date 1595336354 -3600
# Node ID e5d0ea9ac8f10c057dad0cb9ddd8fdea5db5d677
# Parent  5671836cdac79812092de25733d144126fc9526b
OK I give in, we are going to have to put this in a separate DLL so we can deploy a version on Win7 that doesn't have the WinRT dependency

diff -r 5671836cdac7 -r e5d0ea9ac8f1 files.pri
--- a/files.pri	Thu Jun 25 12:20:20 2020 +0100
+++ b/files.pri	Tue Jul 21 13:59:14 2020 +0100
@@ -253,6 +253,7 @@
            rdf/RDFTransformFactory.cpp \
 	   system/Init.cpp \
            system/System.cpp \
+           system/os-other.cpp \
 	   transform/CSVFeatureWriter.cpp \
            transform/FeatureExtractionModelTransformer.cpp \
            transform/FileFeatureWriter.cpp \
diff -r 5671836cdac7 -r e5d0ea9ac8f1 system/System.cpp
--- a/system/System.cpp	Thu Jun 25 12:20:20 2020 +0100
+++ b/system/System.cpp	Tue Jul 21 13:59:14 2020 +0100
@@ -27,12 +27,6 @@
 #include <unistd.h>
 #endif
 
-#ifndef AVOID_WINRT_DEPENDENCY
-#ifdef _MSC_VER
-#include <winrt/Windows.UI.ViewManagement.h>
-#endif
-#endif
-
 #ifdef __APPLE__
 #include <sys/param.h>
 #include <sys/sysctl.h>
@@ -340,45 +334,6 @@
     }
 }
 
-bool
-OSReportsDarkThemeActive()
-{
-#ifndef AVOID_WINRT_DEPENDENCY
-#ifdef _MSC_VER
-    using namespace winrt::Windows::UI::ViewManagement;
-    UISettings settings;
-    auto background = settings.GetColorValue(UIColorType::Background);
-    if (int(background.R) + int(background.G) + int(background.B) < 384) {
-        return true;
-    }
-#endif
-#endif
-    return false;
-}
-
-bool
-OSQueryAccentColour(int &r, int &g, int &b)
-{
-    SVCERR << "OSQueryAccentColour() called" << endl;
-#ifndef AVOID_WINRT_DEPENDENCY
-#ifdef _MSC_VER
-    using namespace winrt::Windows::UI::ViewManagement;
-    bool dark = OSReportsDarkThemeActive();
-    UISettings settings;
-    auto accent = settings.GetColorValue
-        (dark ? UIColorType::AccentLight1 : UIColorType::Accent);
-    r = accent.R;
-    g = accent.G;
-    b = accent.B;
-    return true;
-#endif
-#endif
-    (void)r;
-    (void)g;
-    (void)b;
-    return false;
-}
-
 double mod(double x, double y) { return x - (y * floor(x / y)); }
 float modf(float x, float y) { return x - (y * floorf(x / y)); }
 
diff -r 5671836cdac7 -r e5d0ea9ac8f1 system/System.h
--- a/system/System.h	Thu Jun 25 12:20:20 2020 +0100
+++ b/system/System.h	Tue Jul 21 13:59:14 2020 +0100
@@ -163,6 +163,8 @@
 // if unknown. (Hence signed return type)
 extern ssize_t GetDiscSpaceMBAvailable(const char *path);
 
+extern "C" {
+
 // Return true if the OS desktop is set to use a dark mode
 // theme. Return false if it is set to a light theme or if the theme
 // is unknown.
@@ -172,7 +174,9 @@
 // the current theme; if so, also return by reference the r, g, and b
 // components of the colour (range 0-255). Return false if we can't
 // query such a thing.
-extern bool OSQueryAccentColour(int &r, int &g, int &b);
+extern bool OSQueryAccentColour(int *r, int *g, int *b);
+
+}
 
 extern void StoreStartupLocale();
 extern void RestoreStartupLocale();
diff -r 5671836cdac7 -r e5d0ea9ac8f1 system/os-other.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/system/os-other.cpp	Tue Jul 21 13:59:14 2020 +0100
@@ -0,0 +1,19 @@
+
+extern "C" {
+    
+bool
+OSReportsDarkThemeActive()
+{
+    return false;
+}
+
+bool
+OSQueryAccentColour(int &r, int &g, int &b)
+{
+    (void)r;
+    (void)g;
+    (void)b;
+    return false;
+}
+
+}
diff -r 5671836cdac7 -r e5d0ea9ac8f1 system/os-win10.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/system/os-win10.cpp	Tue Jul 21 13:59:14 2020 +0100
@@ -0,0 +1,49 @@
+
+#ifndef AVOID_WINRT_DEPENDENCY
+#ifdef _MSC_VER
+#include <winrt/Windows.UI.ViewManagement.h>
+#endif
+#endif
+
+extern "C" {
+
+bool
+OSReportsDarkThemeActive()
+{
+#ifndef AVOID_WINRT_DEPENDENCY
+#ifdef _MSC_VER
+    using namespace winrt::Windows::UI::ViewManagement;
+    UISettings settings;
+    auto background = settings.GetColorValue(UIColorType::Background);
+    if (int(background.R) + int(background.G) + int(background.B) < 384) {
+        return true;
+    }
+#endif
+#endif
+    return false;
+}
+
+bool
+OSQueryAccentColour(int *r, int *g, int *b)
+{
+#ifndef AVOID_WINRT_DEPENDENCY
+#ifdef _MSC_VER
+    using namespace winrt::Windows::UI::ViewManagement;
+    bool dark = OSReportsDarkThemeActive();
+    UISettings settings;
+    auto accent = settings.GetColorValue
+        (dark ? UIColorType::AccentLight1 : UIColorType::Accent);
+    *r = accent.R;
+    *g = accent.G;
+    *b = accent.B;
+    return true;
+#endif
+#endif
+    (void)r;
+    (void)g;
+    (void)b;
+    return false;
+}
+
+}
+