Bug 629611. Add font cache size info to about:support. r=bas,joedrew a=joedrew

gfx/thebes/gfxWindowsPlatform.cpp

@@ -76,6 +76,9 @@
 #endif
 #endif
 
+#include <Shlobj.h>
+#include <Shlwapi.h>
+
 #ifdef CAIRO_HAS_D2D_SURFACE
 #include "gfxD2DSurface.h"
 
@@ -728,6 +731,36 @@ gfxWindowsPlatform::GetDLLVersion(const PRUnichar *aDLLPath, nsAString& aVersion
     aVersion.Assign(NS_ConvertUTF8toUTF16(buf));
 }
 
+void
+gfxWindowsPlatform::GetFontCacheSize(nsAString& aSize)
+{
+    WIN32_FIND_DATAW findFileData;
+    HANDLE file;
+    LARGE_INTEGER fileSize;
+    WCHAR path[MAX_PATH];
+
+    aSize.Assign(L"n/a");
+
+    if (FAILED(SHGetFolderPathW(NULL, CSIDL_WINDOWS, NULL, 0, path))) {
+        return;
+    }
+
+    PathAppendW(path, 
+        L"ServiceProfiles\\LocalService\\AppData\\Local\\FontCache-*-*.dat");
+    file = FindFirstFileW(path, &findFileData);
+    if (file == INVALID_HANDLE_VALUE) {
+        return;
+    }
+     
+    WCHAR size[256];
+
+    double sizeMB = (double(findFileData.nFileSizeLow) +
+                     findFileData.nFileSizeHigh * (double(MAXDWORD) + 1))
+                    / 1000000.0;
+    swprintf(size, L"%.2f MB", sizeMB);
+    aSize.Assign(size);
+}
+
 void
 gfxWindowsPlatform::FontsPrefsChanged(nsIPrefBranch *aPrefBranch, const char *aPref)
 {

gfx/thebes/gfxWindowsPlatform.h

@@ -229,6 +229,8 @@ public:
 
     static void GetDLLVersion(const PRUnichar *aDLLPath, nsAString& aVersion);
 
+    static void GetFontCacheSize(nsAString& aSize);
+
     virtual void FontsPrefsChanged(nsIPrefBranch *aPrefBranch, const char *aPref);
 
 #ifdef CAIRO_HAS_DWRITE_FONT

widget/src/windows/GfxInfo.cpp

@@ -102,7 +102,13 @@ GfxInfo::GetDWriteEnabled(PRBool *aEnabled)
 NS_IMETHODIMP
 GfxInfo::GetDWriteVersion(nsAString & aDwriteVersion)
 {
-  gfxWindowsPlatform::GetPlatform()->GetDLLVersion(L"dwrite.dll", aDwriteVersion);
+  nsAutoString str;
+  gfxWindowsPlatform::GetPlatform()->GetDLLVersion(L"dwrite.dll", str);
+  aDwriteVersion.Assign(str);
+  aDwriteVersion.Append(L", font cache ");
+  gfxWindowsPlatform::GetPlatform()->GetFontCacheSize(str);
+  aDwriteVersion.Append(str);
+
   return NS_OK;
 }