Exposes WebCore's FontCache through the webkit API

WebCore has a static FontCache that holds handles to platform-specific font data.  It exposes a few knobs that might be useful to track or minimize memory usage.  This patch exposes an API to experiment with.

TEST=none
BUG=none

Review URL: http://codereview.chromium.org/251081

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@28021 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 116 insertions, 0 deletions

diff --git a/webkit/api/public/WebFontCache.h b/webkit/api/public/WebFontCache.h
new file mode 100644
index 0000000..e9e4399
--- /dev/null
+++ b/webkit/api/public/WebFontCache.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2009 Google Inc. All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef WebFontCache_h
+#define WebFontCache_h
+
+#include "WebCommon.h"
+
+namespace WebKit {
+
+    // An interface to query and configure WebKit's font cache.
+    class WebFontCache {
+    public:
+        // Returns the number of items in the font data cache.
+        WEBKIT_API static size_t fontDataCount();
+
+        // Returns the number of inactive items in the font data cache.
+        WEBKIT_API static size_t inactiveFontDataCount();
+
+        // Invalidates and purges all data held in the font data cache.
+        WEBKIT_API static void invalidate();
+
+    private:
+        WebFontCache();  // Not intended to be instanced.
+    };
+
+}  // namespace WebKit
+
+#endif
diff --git a/webkit/api/src/WebFontCache.cpp b/webkit/api/src/WebFontCache.cpp
new file mode 100644
index 0000000..65ed56d
--- /dev/null
+++ b/webkit/api/src/WebFontCache.cpp
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2009 Google Inc. All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "WebFontCache.h"
+
+#include "FontCache.h"
+
+using namespace WebCore;
+
+namespace WebKit {
+
+// static
+size_t WebFontCache::fontDataCount()
+{
+    return fontCache()->fontDataCount();
+}
+
+// static
+size_t WebFontCache::inactiveFontDataCount()
+{
+    return fontCache()->inactiveFontDataCount();
+}
+
+// static
+void WebFontCache::invalidate()
+{
+    fontCache()->invalidate();
+}
+
+}  // namespace WebKit
diff --git a/webkit/webkit.gyp b/webkit/webkit.gyp
index efc5176..b1bdfb2 100644
--- a/webkit/webkit.gyp
+++ b/webkit/webkit.gyp
@@ -97,6 +97,7 @@
         'api/public/WebFindOptions.h',
         'api/public/WebFrame.h',
         'api/public/WebFrameClient.h',
+        'api/public/WebFontCache.h',
         'api/public/WebForm.h',
         'api/public/WebHistoryItem.h',
         'api/public/WebHTTPBody.h',
@@ -189,6 +190,7 @@
         'api/src/WebDataSourceImpl.cpp',
         'api/src/WebDataSourceImpl.h',
         'api/src/WebDragData.cpp',
+        'api/src/WebFontCache.cpp',
         'api/src/WebForm.cpp',
         'api/src/WebHistoryItem.cpp',
         'api/src/WebHTTPBody.cpp',