content/browser/renderer_host/render_widget_helper_mac.mm

   1 // Copyright 2014 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/render_widget_helper.h"
   6
   7 #import <Cocoa/Cocoa.h>
   8 #include <IOSurface/IOSurfaceAPI.h>
   9
  10 #include "base/bind.h"
  11 #include "content/browser/compositor/browser_compositor_view_mac.h"
  12 #include "content/browser/gpu/gpu_process_host.h"
  13 #include "content/browser/gpu/gpu_surface_tracker.h"
  14 #include "content/common/gpu/gpu_messages.h"
  15 #include "content/common/gpu/surface_handle_types_mac.h"
  16
  17 namespace {
  18
  19 void OnNativeSurfaceBuffersSwappedOnUIThread(
  20     base::ScopedCFTypeRef<IOSurfaceRef> io_surface,
  21     const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params) {
  22   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
  23   gfx::AcceleratedWidget native_widget =
  24       content::GpuSurfaceTracker::Get()->AcquireNativeWidget(params.surface_id);
  25   IOSurfaceID io_surface_id = content::IOSurfaceIDFromSurfaceHandle(
  26       params.surface_handle);
  27   [native_widget gotAcceleratedIOSurfaceFrame:io_surface_id
  28                           withOutputSurfaceID:params.surface_id
  29                               withLatencyInfo:params.latency_info
  30                                 withPixelSize:params.size
  31                               withScaleFactor:params.scale_factor];
  32 }
  33
  34 }  // namespace
  35
  36 namespace content {
  37
  38 void RenderWidgetHelper::OnNativeSurfaceBuffersSwappedOnIOThread(
  39     GpuProcessHost* gpu_process_host,
  40     const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params) {
  41   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
  42
  43   // Immediately acknowledge this frame on the IO thread instead of the UI
  44   // thread. The UI thread will wait on the GPU process. If the UI thread
  45   // were to be responsible for acking swaps, then there would be a cycle
  46   // and a potential deadlock.
  47   // TODO(ccameron): This immediate ack circumvents GPU back-pressure that
  48   // is necessary to throttle renderers. Fix that.
  49   AcceleratedSurfaceMsg_BufferPresented_Params ack_params;
  50   ack_params.sync_point = 0;
  51   ack_params.renderer_id = 0;
  52   gpu_process_host->Send(new AcceleratedSurfaceMsg_BufferPresented(
  53       params.route_id, ack_params));
  54
  55   // Open the IOSurface handle before returning, to ensure that it is not
  56   // closed as soon as the frame is acknowledged.
  57   base::ScopedCFTypeRef<IOSurfaceRef> io_surface(IOSurfaceLookup(
  58           static_cast<uint32>(params.surface_handle)));
  59
  60   BrowserThread::PostTask(
  61       BrowserThread::UI,
  62       FROM_HERE,
  63       base::Bind(&OnNativeSurfaceBuffersSwappedOnUIThread, io_surface, params));
  64 }
  65
  66 }  // namespace content