Mac: Infrastructure for serialization of OS fonts over IPC.

chrome/browser/renderer_host/resource_message_filter.cc

Index: chrome/browser/renderer_host/resource_message_filter.cc
diff --git a/chrome/browser/renderer_host/resource_message_filter.cc b/chrome/browser/renderer_host/resource_message_filter.cc
index a382042176be95dcb6f165dff1ee68fb0062fa10..75957c23b23c16015c9de1df778c486c5ee3a43a 100755
--- a/chrome/browser/renderer_host/resource_message_filter.cc
+++ b/chrome/browser/renderer_host/resource_message_filter.cc
@@ -14,6 +14,7 @@
 #include "base/histogram.h"
 #include "base/process_util.h"
 #include "base/thread.h"
+#include "base/utf_string_conversions.h"
 #include "chrome/browser/appcache/appcache_dispatcher_host.h"
 #include "chrome/browser/browser_about_handler.h"
 #include "chrome/browser/child_process_security_policy.h"
@@ -55,6 +56,10 @@
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/extensions/extension_file_util.h"
 #include "chrome/common/extensions/extension_message_bundle.h"
+#if defined(OS_MACOSX)
+#include "chrome/common/font_descriptor_mac.h"
+#include "chrome/common/font_loader_mac.h"
+#endif
 #include "chrome/common/notification_service.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/render_messages.h"
@@ -473,6 +478,9 @@ bool ResourceMessageFilter::OnMessageReceived(const IPC::Message& msg) {
                                       OnGetRawCookies)
       IPC_MESSAGE_HANDLER(ViewHostMsg_DeleteCookie, OnDeleteCookie)
       IPC_MESSAGE_HANDLER(ViewHostMsg_GetCookiesEnabled, OnGetCookiesEnabled)
+#if defined(OS_MACOSX)
+      IPC_MESSAGE_HANDLER(ViewHostMsg_LoadFont, OnLoadFont)
+#endif
 #if defined(OS_WIN)  // This hack is Windows-specific.
       IPC_MESSAGE_HANDLER(ViewHostMsg_PreCacheFont, OnPreCacheFont)
 #endif
@@ -753,6 +761,27 @@ void ResourceMessageFilter::OnGetCookiesEnabled(
   *enabled = GetRequestContextForURL(url)->AreCookiesEnabled();
 }
 
+#if defined(OS_MACOSX)
+void ResourceMessageFilter::OnLoadFont(const FontDescriptor& font,
+                                       uint32* handle_size,
+                                       base::SharedMemoryHandle* handle) {
+  base::SharedMemory font_data;
+  uint32 font_data_size = 0;
+  bool ok = FontLoader::LoadFontIntoBuffer(font.nsFont(), &font_data,
+                &font_data_size);
+  if (!ok || font_data_size == 0) {
+    LOG(ERROR) << "Couldn't load font data for " << font.font_name <<
+        " ok=" << ok << " font_data_size=" << font_data_size;
+    *handle_size = 0;
+    *handle = base::SharedMemory::NULLHandle();
+    return;
+  }
+
+  *handle_size = font_data_size;
+  font_data.GiveToProcess(base::GetCurrentProcessHandle(), handle);

[agl, 2010/06/17 13:52:29]

Although this works, it looks a bit odd: "Give to process: me" :)

Since this is OS_MACOSX, it's fine to say
handle->fd = font_data.handle()
handle->auto_close = true;
font_data.Unmap();

It saves a dup() too.

+}
+#endif  // OS_MACOSX
+
 #if defined(OS_WIN)  // This hack is Windows-specific.
 void ResourceMessageFilter::OnPreCacheFont(LOGFONT font) {
   // If the renderer is running in a sandbox, GetTextMetrics()
@@ -795,7 +824,7 @@ void ResourceMessageFilter::OnPreCacheFont(LOGFONT font) {
   hdcs[font_index] = hdc;
   font_index = (font_index + 1) % kFontCacheSize;
 }
-#endif
+#endif  // OS_WIN
 
 void ResourceMessageFilter::OnGetPlugins(bool refresh,
                                          IPC::Message* reply_msg) {