[PPAPI] Compositor API implementation

content/renderer/pepper/pepper_compositor_host.cc

+// Copyright 2014 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_compositor_host.h"
+
+#include "base/logging.h"
+#include "cc/layers/texture_layer.h"
+#include "cc/resources/texture_mailbox.h"
+#include "content/public/renderer/renderer_ppapi_host.h"
+#include "content/renderer/pepper/gfx_conversion.h"
+#include "content/renderer/pepper/host_globals.h"
+#include "content/renderer/pepper/pepper_plugin_instance_impl.h"
+#include "content/renderer/pepper/ppb_image_data_impl.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/host/dispatch_host_message.h"
+#include "ppapi/host/host_message_context.h"
+#include "ppapi/host/ppapi_host.h"
+#include "ppapi/proxy/ppapi_messages.h"
+#include "ppapi/thunk/enter.h"
+#include "ppapi/thunk/ppb_image_data_api.h"
+#include "third_party/khronos/GLES2/gl2.h"
+#include "ui/gfx/transform.h"
+
+using ppapi::host::HostMessageContext;
+using ppapi::thunk::EnterResourceNoLock;
+using ppapi::thunk::PPB_ImageData_API;
+
+namespace content {
+
+PepperCompositorHost::PepperCompositorHost(
+    RendererPpapiHost* host,
+    PP_Instance instance,
+    PP_Resource resource)
+    : ResourceHost(host->GetPpapiHost(), instance, resource),
+      bound_instance_(NULL),
+      weak_factory_(this) {
+  layer_ = cc::SolidColorLayer::Create();
+  layer_->SetMasksToBounds(true);
+  layer_->SetIsDrawable(true);
+}
+
+PepperCompositorHost::~PepperCompositorHost() {
+  // Unbind from the instance when destroyed if we're still bound.
+  if (bound_instance_)
+    bound_instance_->BindGraphics(bound_instance_->pp_instance(), 0);
+}
+
+bool PepperCompositorHost::BindToInstance(
+    PepperPluginInstanceImpl* new_instance) {
+  if (new_instance && new_instance->pp_instance() != pp_instance())
+    return false;  // Can't bind other instance's contexts.
+  if (bound_instance_ == new_instance)
+    return true;  // Rebinding the same device, nothing to do.
+  if (bound_instance_ && new_instance)
+    return false;  // Can't change a bound device.
+  bound_instance_ = new_instance;
+  return true;
+}
+
+void PepperCompositorHost::ViewInitiatedPaint() {
+  if (!commit_layers_reply_context_.is_valid())
+    return;
+  host()->SendReply(commit_layers_reply_context_,
+                    PpapiPluginMsg_Compositor_CommitLayersReply());
+  commit_layers_reply_context_ = ppapi::host::ReplyMessageContext();
+}
+
+void PepperCompositorHost::ViewFlushedPaint() {}
+
+void PepperCompositorHost::ResourceReleased(int32_t id,
+                                            uint32_t sync_point,
+                                            bool is_lost) {
+  host()->SendUnsolicitedReply(
+      pp_resource(),
+      PpapiPluginMsg_Compositor_ReleaseResource(id, sync_point, is_lost));
+}
+
+void PepperCompositorHost::ImageReleased(
+    int32_t id,
+    scoped_ptr<base::SharedMemory> shared_memory,
+    uint32_t sync_point,
+    bool is_lost) {
+  ResourceReleased(id, sync_point, is_lost);
+}
+
+int32_t PepperCompositorHost::OnResourceMessageReceived(
+    const IPC::Message& msg,
+    HostMessageContext* context) {
+  PPAPI_BEGIN_MESSAGE_MAP(PepperCompositorHost, msg)
+  PPAPI_DISPATCH_HOST_RESOURCE_CALL(
+      PpapiHostMsg_Compositor_CommitLayers, OnHostMsgCommitLayers)
+  PPAPI_END_MESSAGE_MAP()
+  return ppapi::host::ResourceHost::OnResourceMessageReceived(msg, context);
+}
+
+bool PepperCompositorHost::IsCompositorHost() {
+  return true;
+}
+
+void PepperCompositorHost::UpdateLayer(
+    const scoped_refptr<cc::Layer>& layer,
+    const ppapi::CompositorLayerData* old_layer,
+    const ppapi::CompositorLayerData* new_layer) {
+  CHECK(!old_layer || new_layer->type == old_layer->type);
+
+  // Always update properties on cc::Layer, because cc::Layer
+  // will ignore any setting with unchanged value.
+  layer->SetBounds(PP_ToGfxSize((new_layer)->size));
+  layer->SetBlendMode(SkXfermode::kSrcOver_Mode);
+  layer->SetOpacity(new_layer->opacity / 255.0f);
+
+  gfx::Transform transform(gfx::Transform::kSkipInitialization);
+  transform.matrix().setColMajorf(new_layer->transform);
+  layer->SetTransform(transform);
+
+  // Consider a (0,0,0,0) rect as no clip rect.
+  if (new_layer->clip_rect.point.x != 0 ||
+      new_layer->clip_rect.point.y != 0 ||
+      new_layer->clip_rect.size.width != 0 ||
+      new_layer->clip_rect.size.height != 0) {
+    if (!layer->mask_layer())
+      layer->SetMaskLayer(cc::Layer::Create());
+    layer->mask_layer()->SetPosition(PP_ToGfxPoint(new_layer->clip_rect.point));
+    layer->mask_layer()->SetBounds(PP_ToGfxSize(new_layer->clip_rect.size));
+  } else {
+    layer->SetMaskLayer(NULL);
+  }
+
+  if (new_layer->type == ppapi::CompositorLayerData::TYPE_COLOR) {
+    layer->SetBackgroundColor(SkColorSetARGBMacro(new_layer->color.alpha,
+                                                  new_layer->color.red,
+                                                  new_layer->color.green,
+                                                  new_layer->color.blue));
+  } else if (new_layer->type == ppapi::CompositorLayerData::TYPE_TEXTURE) {
+    scoped_refptr<cc::TextureLayer> texture_layer(
+        static_cast<cc::TextureLayer*>(layer.get()));
+    if (!old_layer || new_layer->texture.id != old_layer->texture.id) {
+      gpu::Mailbox gpu_mailbox;
+      gpu_mailbox.SetName(new_layer->texture.mailbox);
+      cc::TextureMailbox mailbox(gpu_mailbox,
+                                 GL_TEXTURE_2D,
+                                 new_layer->texture.sync_point);
+      texture_layer->SetTextureMailbox(mailbox,
+          cc::SingleReleaseCallback::Create(
+              base::Bind(&PepperCompositorHost::ResourceReleased,
+                         weak_factory_.GetWeakPtr(),
+                         new_layer->texture.id)));;
+    }
+    texture_layer->SetPremultipliedAlpha(new_layer->texture.premult_alpha);
+    gfx::RectF rect = PP_ToGfxRectF(new_layer->texture.source_rect);
+    texture_layer->SetUV(rect.origin(), rect.bottom_right());
+  } else if (new_layer->type == ppapi::CompositorLayerData::TYPE_IMAGE) {
+    if (!old_layer || new_layer->image.id != old_layer->image.id) {
+      scoped_refptr<cc::TextureLayer> image_layer(
+          static_cast<cc::TextureLayer*>(layer.get()));
+      EnterResourceNoLock<PPB_ImageData_API> enter(
+          new_layer->image.host_resource, true);
+
+      CHECK(enter.succeeded()) << "Image is invalid!";
+      PP_ImageDataDesc desc;
+      CHECK(enter.object()->Describe(&desc)) << "Can not describe the image!";
+
+      // TODO(penghuang): support all kinds of image.
+      CHECK_EQ(desc.stride, desc.size.width * 4);
+      CHECK_EQ(desc.format, PP_IMAGEDATAFORMAT_RGBA_PREMUL);
+
+      int handle;
+      uint32_t byte_count;
+      CHECK_EQ(enter.object()->GetSharedMemory(&handle, &byte_count), PP_OK)
+          <<"Can not access the image's shared memory!";

[raymes, 2014/06/04 01:11:38]

You might as well keep all of these checks in now, maybe just convert them to
DCHECKs (since they are all checked before calling the function).

[Peng, 2014/06/05 00:50:38]

Done.

+#if defined(OS_WIN)
+      base::SharedMemoryHandle shm_handle =
+          static_cast<base::SharedMemoryHandle>(_dup(handle));
+#else
+      base::SharedMemoryHandle shm_handle(dup(handle), false);
+#endif
+      // Use a scoped_ptr to keep shared_memory alive until
+      // PepperCompositorHost::ImageReleased is called.
+      scoped_ptr<base::SharedMemory> shared_memory(
+          new base::SharedMemory(shm_handle, true));
+      CHECK(shared_memory->Map(desc.stride * desc.size.height));
+      cc::TextureMailbox mailbox(shared_memory.get(),
+                                 PP_ToGfxSize(desc.size));
+      image_layer->SetTextureMailbox(mailbox,
+          cc::SingleReleaseCallback::Create(
+              base::Bind(&PepperCompositorHost::ImageReleased,
+                         weak_factory_.GetWeakPtr(),
+                         new_layer->image.id,
+                         base::Passed(&shared_memory))));
+
+      // ImageData is always premultiplied alpha.
+      image_layer->SetPremultipliedAlpha(true);
+    }
+  } else {
+    NOTREACHED();
+  }
+}
+
+int32_t PepperCompositorHost::OnHostMsgCommitLayers(
+    HostMessageContext* context,
+    const std::vector<ppapi::CompositorLayerData>& layers,
+    bool reset) {
+  // Do not support CommitLayers on an unbounded compositor.
+  if (!bound_instance_)
+    return PP_ERROR_FAILED;
+
+  CHECK(!commit_layers_reply_context_.is_valid());
+  commit_layers_reply_context_ = context->MakeReplyMessageContext();
+
+  // ResetLayers() has been called, we need rebuild layer stack.
+  if (reset) {
+    layer_->RemoveAllChildren();
+    cc_layers_.clear();
+    pp_layers_.clear();
+  }
+
+  for (size_t i = 0; i < layers.size(); ++i) {
+    const ppapi::CompositorLayerData& pp_layer = layers[i];
+    ppapi::CompositorLayerData* old_layer =
+        i >= pp_layers_.size() ? NULL : &pp_layers_[i];
+    scoped_refptr<cc::Layer> cc_layer =
+        i >= cc_layers_.size() ? NULL : cc_layers_[i];
+
+    CHECK((old_layer && cc_layer) || (!old_layer && !cc_layer));
+
+    if (!cc_layer) {
+      if (pp_layer.type == ppapi::CompositorLayerData::TYPE_COLOR) {
+        cc_layer = cc::SolidColorLayer::Create();
+      } else if (pp_layer.type == ppapi::CompositorLayerData::TYPE_TEXTURE ||
+               pp_layer.type == ppapi::CompositorLayerData::TYPE_IMAGE) {
+        cc_layer = cc::TextureLayer::CreateForMailbox(NULL);
+      } else {
+        NOTREACHED();
+      }
+      cc_layer->SetIsDrawable(true);
+      cc_layer->SetAnchorPoint(gfx::PointF());
+    }
+
+    UpdateLayer(cc_layer, old_layer, &pp_layer);
+
+    if (old_layer) {
+      *old_layer = pp_layer;
+    } else {
+      layer_->AddChild(cc_layer);
+      cc_layers_.push_back(cc_layer);
+      pp_layers_.push_back(pp_layer);
+    }
+  }
+  return PP_OK_COMPLETIONPENDING;
+}
+
+}  // namespace content