1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "content/browser/renderer_host/pepper/pepper_truetype_font_list_host.h" 6 7 #include <algorithm> 8 9 #include "base/safe_numerics.h" 10 #include "base/threading/sequenced_worker_pool.h" 11 #include "content/browser/renderer_host/pepper/pepper_truetype_font_list.h" 12 #include "content/common/font_list.h" 13 #include "content/public/browser/browser_ppapi_host.h" 14 #include "content/public/browser/browser_thread.h" 15 #include "ppapi/host/dispatch_host_message.h" 16 #include "ppapi/host/host_message_context.h" 17 #include "ppapi/host/resource_message_filter.h" 18 #include "ppapi/proxy/ppapi_messages.h" 19 20 namespace content { 21 22 namespace { 23 24 // Handles the font list request on the blocking pool. 25 class FontMessageFilter : public ppapi::host::ResourceMessageFilter { 26 public: 27 FontMessageFilter(); 28 29 // ppapi::host::ResourceMessageFilter implementation. 30 virtual scoped_refptr<base::TaskRunner> OverrideTaskRunnerForMessage( 31 const IPC::Message& msg) OVERRIDE; 32 virtual int32_t OnResourceMessageReceived( 33 const IPC::Message& msg, 34 ppapi::host::HostMessageContext* context) OVERRIDE; 35 36 private: 37 virtual ~FontMessageFilter(); 38 39 // Message handlers. 40 int32_t OnHostMsgGetFontFamilies(ppapi::host::HostMessageContext* context); 41 int32_t OnHostMsgGetFontsInFamily(ppapi::host::HostMessageContext* context, 42 const std::string& family); 43 44 DISALLOW_COPY_AND_ASSIGN(FontMessageFilter); 45 }; 46 47 FontMessageFilter::FontMessageFilter() { 48 } 49 50 FontMessageFilter::~FontMessageFilter() { 51 } 52 53 scoped_refptr<base::TaskRunner> FontMessageFilter::OverrideTaskRunnerForMessage( 54 const IPC::Message& msg) { 55 // Use the blocking pool to get the font list (currently the only message) 56 // Since getting the font list is non-threadsafe on Linux (for versions of 57 // Pango predating 2013), use a sequenced task runner. 58 base::SequencedWorkerPool* pool = BrowserThread::GetBlockingPool(); 59 return pool->GetSequencedTaskRunner( 60 pool->GetNamedSequenceToken(kFontListSequenceToken)); 61 } 62 63 int32_t FontMessageFilter::OnResourceMessageReceived( 64 const IPC::Message& msg, 65 ppapi::host::HostMessageContext* context) { 66 IPC_BEGIN_MESSAGE_MAP(FontMessageFilter, msg) 67 PPAPI_DISPATCH_HOST_RESOURCE_CALL_0( 68 PpapiHostMsg_TrueTypeFontSingleton_GetFontFamilies, 69 OnHostMsgGetFontFamilies) 70 PPAPI_DISPATCH_HOST_RESOURCE_CALL( 71 PpapiHostMsg_TrueTypeFontSingleton_GetFontsInFamily, 72 OnHostMsgGetFontsInFamily) 73 IPC_END_MESSAGE_MAP() 74 return PP_ERROR_FAILED; 75 } 76 77 int32_t FontMessageFilter::OnHostMsgGetFontFamilies( 78 ppapi::host::HostMessageContext* context) { 79 // OK to use "slow blocking" version since we're on the blocking pool. 80 std::vector<std::string> font_families; 81 GetFontFamilies_SlowBlocking(&font_families); 82 // Sort the names in case the host platform returns them out of order. 83 std::sort(font_families.begin(), font_families.end()); 84 85 int32_t result = base::checked_numeric_cast<int32_t>(font_families.size()); 86 ppapi::host::ReplyMessageContext reply_context = 87 context->MakeReplyMessageContext(); 88 reply_context.params.set_result(result); 89 context->reply_msg = 90 PpapiPluginMsg_TrueTypeFontSingleton_GetFontFamiliesReply(font_families); 91 return result; 92 } 93 94 int32_t FontMessageFilter::OnHostMsgGetFontsInFamily( 95 ppapi::host::HostMessageContext* context, 96 const std::string& family) { 97 // OK to use "slow blocking" version since we're on the blocking pool. 98 std::vector<ppapi::proxy::SerializedTrueTypeFontDesc> fonts_in_family; 99 GetFontsInFamily_SlowBlocking(family, &fonts_in_family); 100 101 int32_t result = base::checked_numeric_cast<int32_t>(fonts_in_family.size()); 102 ppapi::host::ReplyMessageContext reply_context = 103 context->MakeReplyMessageContext(); 104 reply_context.params.set_result(result); 105 context->reply_msg = 106 PpapiPluginMsg_TrueTypeFontSingleton_GetFontsInFamilyReply( 107 fonts_in_family); 108 return result; 109 } 110 111 } // namespace 112 113 PepperTrueTypeFontListHost::PepperTrueTypeFontListHost( 114 BrowserPpapiHost* host, 115 PP_Instance instance, 116 PP_Resource resource) 117 : ResourceHost(host->GetPpapiHost(), instance, resource) { 118 AddFilter(scoped_refptr<ppapi::host::ResourceMessageFilter>( 119 new FontMessageFilter())); 120 } 121 122 PepperTrueTypeFontListHost::~PepperTrueTypeFontListHost() { 123 } 124 125 } // namespace content 126