From bdfd1791d80445379bde6549076d0a1dc5387331 Mon Sep 17 00:00:00 2001
From: "michaelp%netscape.com" <michaelp%netscape.com>
Date: Sat, 1 Aug 1998 21:36:05 +0000
Subject: [PATCH] added font existence API.

---
 gfx/src/motif/nsDeviceContextUnix.h    |  2 ++
 gfx/src/nsIDeviceContext.h             |  1 +
 gfx/src/windows/nsDeviceContextWin.cpp | 24 ++++++++++++++++++++++++
 gfx/src/windows/nsDeviceContextWin.h   |  2 ++
 4 files changed, 29 insertions(+)

diff --git a/gfx/src/motif/nsDeviceContextUnix.h b/gfx/src/motif/nsDeviceContextUnix.h
index 28fcf31041c6..487187bfb635 100644
--- a/gfx/src/motif/nsDeviceContextUnix.h
+++ b/gfx/src/motif/nsDeviceContextUnix.h
@@ -97,6 +97,8 @@ public:
                            PRInt32              aId,
                            nsIImage*&           aImage);
 
+  NS_IMETHOD CheckFontExistence(const char * aFontName);
+
 protected:
   ~nsDeviceContextUnix();
   nsresult CreateFontCache();
diff --git a/gfx/src/nsIDeviceContext.h b/gfx/src/nsIDeviceContext.h
index 59def53e7bfa..4085341fd78a 100644
--- a/gfx/src/nsIDeviceContext.h
+++ b/gfx/src/nsIDeviceContext.h
@@ -108,6 +108,7 @@ public:
                            PRInt32              aId,
                            nsIImage*&           aImage) = 0;
 
+  NS_IMETHOD CheckFontExistence(const char * aFontName) = 0;
 };
 
 #endif /* nsIDeviceContext_h___ */
diff --git a/gfx/src/windows/nsDeviceContextWin.cpp b/gfx/src/windows/nsDeviceContextWin.cpp
index 9e1f0b71cd26..a33155e72d83 100644
--- a/gfx/src/windows/nsDeviceContextWin.cpp
+++ b/gfx/src/windows/nsDeviceContextWin.cpp
@@ -59,4 +59,28 @@ nsDrawingSurface nsDeviceContextWin :: GetDrawingSurface(nsIRenderingContext &aC
   return mSurface;
 }
 
+int CALLBACK fontcallback(ENUMLOGFONT FAR *lpelf, NEWTEXTMETRIC FAR *lpntm,
+                          int FontType, LPARAM lParam)  
+{
+  if (NULL != lpelf)
+    *((PRBool *)lParam) = PR_TRUE;
+
+  return 0;
+}
+
+NS_IMETHODIMP nsDeviceContextWin :: CheckFontExistence(const char * aFontName)
+{
+  HWND    hwnd = (HWND)GetNativeWidget();
+  HDC     hdc = ::GetDC(hwnd);
+  PRBool  isthere = PR_FALSE;
+
+  ::EnumFontFamilies(hdc, aFontName, (FONTENUMPROC)fontcallback, (LPARAM)&isthere);
+
+  ::ReleaseDC(hwnd, hdc);
+
+  if (PR_TRUE == isthere)
+    return NS_OK;
+  else
+    return NS_ERROR_FAILURE;
+}
 
diff --git a/gfx/src/windows/nsDeviceContextWin.h b/gfx/src/windows/nsDeviceContextWin.h
index e90c4e5f0062..042450bbc523 100644
--- a/gfx/src/windows/nsDeviceContextWin.h
+++ b/gfx/src/windows/nsDeviceContextWin.h
@@ -36,6 +36,8 @@ public:
   //in the device context for re-use.
   virtual nsDrawingSurface GetDrawingSurface(nsIRenderingContext &aContext);
 
+  NS_IMETHOD CheckFontExistence(const char * aFontName);
+
 protected:
   virtual ~nsDeviceContextWin();