Add Pepper TrueType font API call to enumerate fonts in a given family.

ppapi/proxy/truetype_font_singleton_resource.cc

Index: ppapi/proxy/truetype_font_singleton_resource.cc
diff --git a/ppapi/proxy/truetype_font_singleton_resource.cc b/ppapi/proxy/truetype_font_singleton_resource.cc
index b812bf1647fc1186a2dfcc8bc6d2899965630ed4..58561de863f376c538648cb6df543861bae66653 100644
--- a/ppapi/proxy/truetype_font_singleton_resource.cc
+++ b/ppapi/proxy/truetype_font_singleton_resource.cc
@@ -6,8 +6,10 @@
 
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/shared_impl/array_writer.h"
+#include "ppapi/shared_impl/ppapi_globals.h"
 #include "ppapi/shared_impl/tracked_callback.h"
 #include "ppapi/shared_impl/var.h"
+#include "ppapi/shared_impl/var_tracker.h"
 
 namespace ppapi {
 namespace proxy {
@@ -39,11 +41,30 @@ int32_t TrueTypeFontSingletonResource::GetFontFamilies(
   return PP_OK_COMPLETIONPENDING;
 }
 
+int32_t TrueTypeFontSingletonResource::GetFontsInFamily(
+      PP_Instance instance,
+      PP_Var family,
+      const PP_ArrayOutput& output,
+      const scoped_refptr<TrackedCallback>& callback) {
+  scoped_refptr<StringVar> family_var = StringVar::FromPPVar(family);
+  const uint32_t kMaxFamilySizeInBytes = 1024;
+  if (!family_var || family_var->value().size() > kMaxFamilySizeInBytes)
+    return PP_ERROR_BADARGUMENT;
+  Call<PpapiPluginMsg_TrueTypeFontSingleton_GetFontsInFamilyReply>(BROWSER,
+      PpapiHostMsg_TrueTypeFontSingleton_GetFontsInFamily(family_var->value()),
+      base::Bind(
+          &TrueTypeFontSingletonResource::OnPluginMsgGetFontsInFamilyComplete,
+          this, callback, output));
+  return PP_OK_COMPLETIONPENDING;
+}
+
 void TrueTypeFontSingletonResource::OnPluginMsgGetFontFamiliesComplete(
     scoped_refptr<TrackedCallback> callback,
     PP_ArrayOutput array_output,
     const ResourceMessageReplyParams& params,
     const std::vector<std::string>& font_families) {
+  if (!TrackedCallback::IsPending(callback))
+    return;
   // The result code should contain the data size if it's positive.
   int32_t result = params.result();
   DCHECK((result < 0 && font_families.size() == 0) ||
@@ -64,5 +85,36 @@ void TrueTypeFontSingletonResource::OnPluginMsgGetFontFamiliesComplete(
   callback->Run(result);
 }
 
+void TrueTypeFontSingletonResource::OnPluginMsgGetFontsInFamilyComplete(
+    scoped_refptr<TrackedCallback> callback,
+    PP_ArrayOutput array_output,
+    const ResourceMessageReplyParams& params,
+    const std::vector<SerializedTrueTypeFontDesc>& fonts) {
+  if (!TrackedCallback::IsPending(callback))
+    return;
+  // The result code should contain the data size if it's positive.
+  int32_t result = params.result();
+  DCHECK((result < 0 && fonts.size() == 0) ||
+         result == static_cast<int32_t>(fonts.size()));
+  ArrayWriter output;
+  output.set_pp_array_output(array_output);
+  if (output.is_valid()) {
+    // Convert the message data to an array of PP_TrueTypeFontDesc_Dev structs.
+    // Each desc has an embedded PP_Var containing the family name.
+    std::vector<PP_TrueTypeFontDesc_Dev> pp_fonts(fonts.size());
+    for (size_t i = 0; i < fonts.size(); i++)
+      fonts[i].CopyToPPTrueTypeFontDesc(&pp_fonts[i]);
+
+    if (!output.StoreVector(pp_fonts)) {
+      for (size_t i = 0; i < pp_fonts.size(); i++)
+        PpapiGlobals::Get()->GetVarTracker()->ReleaseVar(pp_fonts[i].family);
+    }
+  } else {
+    result = PP_ERROR_FAILED;
+  }
+
+  callback->Run(result);
+}
+
 }  // namespace proxy
 }  // namespace ppapi