Refactor 4 PPB_Flash functions to the new PPAPI resource model.

content/renderer/pepper/pepper_flash_renderer_host.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/pepper/pepper_flash_renderer_host.h"
 
+#include <vector>
+
 #include "content/public/renderer/render_thread.h"
 #include "content/public/renderer/renderer_ppapi_host.h"
 #include "googleurl/src/gurl.h"
 #include "ipc/ipc_message_macros.h"
 #include "ppapi/c/pp_errors.h"
+#include "ppapi/c/trusted/ppb_browser_font_trusted.h"
 #include "ppapi/host/dispatch_host_message.h"
+#include "ppapi/proxy/host_dispatcher.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/proxy/resource_message_params.h"
+#include "ppapi/proxy/serialized_structs.h"
+#include "ppapi/thunk/enter.h"
+#include "ppapi/thunk/ppb_image_data_api.h"
+#include "skia/ext/platform_canvas.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkMatrix.h"
+#include "third_party/skia/include/core/SkPaint.h"
+#include "third_party/skia/include/core/SkPoint.h"
+#include "third_party/skia/include/core/SkTemplates.h"
+#include "third_party/skia/include/core/SkTypeface.h"
+#include "ui/gfx/rect.h"
+#include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
+#include "webkit/plugins/ppapi/ppb_image_data_impl.h"
+
+using ppapi::thunk::EnterResourceNoLock;
+using ppapi::thunk::PPB_ImageData_API;
 
 namespace content {
 
 PepperFlashRendererHost::PepperFlashRendererHost(
     RendererPpapiHost* host,
     PP_Instance instance,
     PP_Resource resource)
-    : ResourceHost(host->GetPpapiHost(), instance, resource) {
+    : ResourceHost(host->GetPpapiHost(), instance, resource),
+      weak_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)),
+      host_(host) {
 }
 
 PepperFlashRendererHost::~PepperFlashRendererHost() {
+  // This object may be destroyed in the middle of a sync message. If that is
+  // the case, make sure we respond to all the pending navigate calls.
+  std::vector<ppapi::host::ReplyMessageContext>::reverse_iterator it;
+  for (it = navigate_replies_.rbegin(); it != navigate_replies_.rend(); ++it)
+    SendReply(*it, IPC::Message());
 }
 
 int32_t PepperFlashRendererHost::OnResourceMessageReceived(
     const IPC::Message& msg,
     ppapi::host::HostMessageContext* context) {
   IPC_BEGIN_MESSAGE_MAP(PepperFlashRendererHost, msg)
     PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_Flash_GetProxyForURL,
                                       OnMsgGetProxyForURL);
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_Flash_SetInstanceAlwaysOnTop,
+                                      OnMsgSetInstanceAlwaysOnTop);
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_Flash_DrawGlyphs,
+                                      OnMsgDrawGlyphs);
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_Flash_Navigate,
+                                      OnMsgNavigate);
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_Flash_IsRectTopmost,
+                                      OnMsgIsRectTopmost);
   IPC_END_MESSAGE_MAP()
   return PP_ERROR_FAILED;
 }
 
 int32_t PepperFlashRendererHost::OnMsgGetProxyForURL(
     ppapi::host::HostMessageContext* host_context,
     const std::string& url) {
   GURL gurl(url);
   if (!gurl.is_valid())
     return PP_ERROR_FAILED;
   std::string proxy;
   bool result = RenderThread::Get()->ResolveProxy(gurl, &proxy);
   if (!result)
     return PP_ERROR_FAILED;
   host_context->reply_msg = PpapiPluginMsg_Flash_GetProxyForURLReply(proxy);
   return PP_OK;
 }
 
+int32_t PepperFlashRendererHost::OnMsgSetInstanceAlwaysOnTop(
+    ppapi::host::HostMessageContext* host_context,
+    bool on_top) {
+  webkit::ppapi::PluginInstance* plugin_instance =
+      host_->GetPluginInstance(pp_instance());
+  if (plugin_instance)
+    plugin_instance->set_always_on_top(on_top);
+  // Since no reply is sent for this message, it doesn't make sense to return an
+  // error.
+  return PP_OK;
+}
+
+int32_t PepperFlashRendererHost::OnMsgDrawGlyphs(
+    ppapi::host::HostMessageContext* host_context,
+    ppapi::proxy::PPBFlash_DrawGlyphs_Params params) {
+  if (params.glyph_indices.size() != params.glyph_advances.size() ||
+      params.glyph_indices.empty())
+    return PP_ERROR_FAILED;
+
+  EnterResourceNoLock<PPB_ImageData_API> enter(
+      params.image_data.host_resource(), true);
+  if (enter.failed())
+    return PP_ERROR_FAILED;
+  webkit::ppapi::PPB_ImageData_Impl* image_resource =
+      static_cast<webkit::ppapi::PPB_ImageData_Impl*>(enter.object());
+
+  webkit::ppapi::ImageDataAutoMapper mapper(image_resource);
+  if (!mapper.is_valid())
+    return PP_ERROR_FAILED;
+
+  // Set up the typeface.
+  int style = SkTypeface::kNormal;
+  if (static_cast<PP_BrowserFont_Trusted_Weight>(params.font_desc.weight) >=
+      PP_BROWSERFONT_TRUSTED_WEIGHT_BOLD)
+    style |= SkTypeface::kBold;
+  if (params.font_desc.italic)
+    style |= SkTypeface::kItalic;
+  skia::RefPtr<SkTypeface> typeface = skia::AdoptRef(
+      SkTypeface::CreateFromName(params.font_desc.face.c_str(),
+                                 static_cast<SkTypeface::Style>(style)));
+  if (!typeface)
+    return PP_ERROR_FAILED;
+
+  // Set up the canvas.
+  SkCanvas* canvas = image_resource->GetPlatformCanvas();
+  SkAutoCanvasRestore acr(canvas, true);
+
+  // Clip is applied in pixels before the transform.
+  SkRect clip_rect = {
+    SkIntToScalar(params.clip.point.x),
+    SkIntToScalar(params.clip.point.y),
+    SkIntToScalar(params.clip.point.x + params.clip.size.width),
+    SkIntToScalar(params.clip.point.y + params.clip.size.height)
+  };
+  canvas->clipRect(clip_rect);
+
+  // Convert & set the matrix.
+  SkMatrix matrix;
+  matrix.set(SkMatrix::kMScaleX, SkFloatToScalar(params.transformation[0][0]));
+  matrix.set(SkMatrix::kMSkewX,  SkFloatToScalar(params.transformation[0][1]));
+  matrix.set(SkMatrix::kMTransX, SkFloatToScalar(params.transformation[0][2]));
+  matrix.set(SkMatrix::kMSkewY,  SkFloatToScalar(params.transformation[1][0]));
+  matrix.set(SkMatrix::kMScaleY, SkFloatToScalar(params.transformation[1][1]));
+  matrix.set(SkMatrix::kMTransY, SkFloatToScalar(params.transformation[1][2]));
+  matrix.set(SkMatrix::kMPersp0, SkFloatToScalar(params.transformation[2][0]));
+  matrix.set(SkMatrix::kMPersp1, SkFloatToScalar(params.transformation[2][1]));
+  matrix.set(SkMatrix::kMPersp2, SkFloatToScalar(params.transformation[2][2]));
+  canvas->concat(matrix);
+
+  SkPaint paint;
+  paint.setColor(params.color);
+  paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
+  paint.setAntiAlias(true);
+  paint.setHinting(SkPaint::kFull_Hinting);
+  paint.setTextSize(SkIntToScalar(params.font_desc.size));
+  paint.setTypeface(typeface.get());  // Takes a ref and manages lifetime.
+  if (params.allow_subpixel_aa) {
+    paint.setSubpixelText(true);
+    paint.setLCDRenderText(true);
+  }
+
+  SkScalar x = SkIntToScalar(params.position.x);
+  SkScalar y = SkIntToScalar(params.position.y);
+
+  // Build up the skia advances.
+  size_t glyph_count = params.glyph_indices.size();
+  if (glyph_count == 0)
+    return PP_OK;
+  std::vector<SkPoint> storage;
+  storage.resize(glyph_count);
+  SkPoint* sk_positions = &storage[0];
+  for (uint32_t i = 0; i < glyph_count; i++) {
+    sk_positions[i].set(x, y);
+    x += SkFloatToScalar(params.glyph_advances[i].x);
+    y += SkFloatToScalar(params.glyph_advances[i].y);
+  }
+
+  canvas->drawPosText(&params.glyph_indices[0], glyph_count * 2, sk_positions,
+                      paint);
+
+  return PP_OK;
+}
+
+// CAUTION: This code is subtle because Navigate is a sync call which may
+// cause re-entrancy or cause the instance to be destroyed. If the instance
+// is destroyed we need to ensure that we respond to all outstanding sync
+// messages so that the plugin process does not remain blocked.
+int32_t PepperFlashRendererHost::OnMsgNavigate(
+    ppapi::host::HostMessageContext* host_context,
+    const ppapi::URLRequestInfoData& data,
+    const std::string& target,
+    bool from_user_action) {
+  // If our PluginInstance is already destroyed, just return a failure.
+  webkit::ppapi::PluginInstance* plugin_instance =
+      host_->GetPluginInstance(pp_instance());
+  if (!plugin_instance)
+    return PP_ERROR_FAILED;
+
+  // Navigate may call into Javascript (e.g. with a "javascript:" URL),
+  // or do things like navigate away from the page, either one of which will
+  // need to re-enter into the plugin. It is safe, because it is essentially
+  // equivalent to NPN_GetURL, where Flash would expect re-entrancy.
+  ppapi::proxy::HostDispatcher* host_dispatcher =
+      ppapi::proxy::HostDispatcher::GetForInstance(pp_instance());
+  host_dispatcher->set_allow_plugin_reentrancy();
+
+  // Grab a weak pointer to ourselves on the stack so we can check if we are
+  // still alive.
+  base::WeakPtr<PepperFlashRendererHost> weak_ptr = weak_factory_.GetWeakPtr();
+  // Keep track of reply contexts in case we are destroyed during a Navigate
+  // call. Even if we are destroyed, we still need to send these replies to
+  // unblock the plugin process.
+  navigate_replies_.push_back(host_context->MakeReplyMessageContext());
+  plugin_instance->Navigate(data, target.c_str(), from_user_action);
+  // This object might have been destroyed by this point. If it is destroyed
+  // the reply will be sent in the destructor. Otherwise send the reply here.
+  if (weak_ptr) {
+    SendReply(navigate_replies_.back(), IPC::Message());
+    navigate_replies_.pop_back();
+  }
+
+  // Return PP_OK_COMPLETIONPENDING so that no reply is automatically sent.
+  return PP_OK_COMPLETIONPENDING;
+}
+
+int32_t PepperFlashRendererHost::OnMsgIsRectTopmost(
+    ppapi::host::HostMessageContext* host_context,
+    const PP_Rect& rect) {
+  webkit::ppapi::PluginInstance* plugin_instance =
+      host_->GetPluginInstance(pp_instance());
+  if (plugin_instance && plugin_instance->IsRectTopmost(
+      gfx::Rect(rect.point.x, rect.point.y,rect.size.width, rect.size.height)))
+    return PP_OK;
+  return PP_ERROR_FAILED;
+}
+
 }  // namespace content