$NetBSD$

* Part of patchset to build electron on NetBSD
* Based on OpenBSD's chromium patches, and
  FreeBSD's electron patches

--- components/viz/service/display_embedder/software_output_device_proxy.cc.orig	2025-07-08 14:12:31.195262821 +0000
+++ components/viz/service/display_embedder/software_output_device_proxy.cc
@@ -0,0 +1,161 @@
+// 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 "components/viz/service/display_embedder/software_output_device_proxy.h"
+
+#include "base/memory/unsafe_shared_memory_region.h"
+#include "base/threading/thread_checker.h"
+#include "base/trace_event/trace_event.h"
+#include "build/build_config.h"
+#include "components/viz/common/resources/resource_sizes.h"
+#include "components/viz/service/display_embedder/output_device_backing.h"
+#include "mojo/public/cpp/system/platform_handle.h"
+#include "services/viz/privileged/mojom/compositing/layered_window_updater.mojom.h"
+#include "skia/ext/platform_canvas.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "ui/gfx/skia_util.h"
+
+#if BUILDFLAG(IS_WIN)
+#include "skia/ext/skia_utils_win.h"
+#include "ui/gfx/gdi_util.h"
+#include "ui/gfx/win/hwnd_util.h"
+#else
+#include "mojo/public/cpp/base/shared_memory_utils.h"
+#endif
+
+namespace viz {
+
+SoftwareOutputDeviceBase::~SoftwareOutputDeviceBase() {
+  DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
+  DCHECK(!in_paint_);
+}
+
+void SoftwareOutputDeviceBase::Resize(const gfx::Size& viewport_pixel_size,
+                                      float scale_factor) {
+  DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
+  DCHECK(!in_paint_);
+
+  if (viewport_pixel_size_ == viewport_pixel_size)
+    return;
+
+  viewport_pixel_size_ = viewport_pixel_size;
+  ResizeDelegated();
+}
+
+SkCanvas* SoftwareOutputDeviceBase::BeginPaint(const gfx::Rect& damage_rect) {
+  DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
+  DCHECK(!in_paint_);
+
+  damage_rect_ = damage_rect;
+  in_paint_ = true;
+  return BeginPaintDelegated();
+}
+
+void SoftwareOutputDeviceBase::EndPaint() {
+  DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
+  DCHECK(in_paint_);
+
+  in_paint_ = false;
+
+  gfx::Rect intersected_damage_rect = damage_rect_;
+  intersected_damage_rect.Intersect(gfx::Rect(viewport_pixel_size_));
+  if (intersected_damage_rect.IsEmpty())
+    return;
+
+  EndPaintDelegated(intersected_damage_rect);
+}
+
+SoftwareOutputDeviceProxy::~SoftwareOutputDeviceProxy() = default;
+
+SoftwareOutputDeviceProxy::SoftwareOutputDeviceProxy(
+    mojo::PendingRemote<mojom::LayeredWindowUpdater> layered_window_updater)
+    : layered_window_updater_(std::move(layered_window_updater)) {
+  DCHECK(layered_window_updater_.is_bound());
+}
+
+void SoftwareOutputDeviceProxy::OnSwapBuffers(
+    SoftwareOutputDevice::SwapBuffersCallback swap_ack_callback,
+    gfx::FrameData data) {
+  DCHECK(swap_ack_callback_.is_null());
+
+  // We aren't waiting on DrawAck() and can immediately run the callback.
+  if (!waiting_on_draw_ack_) {
+    task_runner_->PostTask(
+        FROM_HERE,
+        base::BindOnce(std::move(swap_ack_callback), viewport_pixel_size_));
+    return;
+  }
+
+  swap_ack_callback_ = std::move(swap_ack_callback);
+}
+
+void SoftwareOutputDeviceProxy::ResizeDelegated() {
+  canvas_.reset();
+
+  size_t required_bytes;
+  if (!ResourceSizes::MaybeSizeInBytes(viewport_pixel_size_,
+                                       SinglePlaneFormat::kRGBA_8888,
+                                       &required_bytes)) {
+    DLOG(ERROR) << "Invalid viewport size " << viewport_pixel_size_.ToString();
+    return;
+  }
+
+  base::UnsafeSharedMemoryRegion region =
+      base::UnsafeSharedMemoryRegion::Create(required_bytes);
+  if (!region.IsValid()) {
+    DLOG(ERROR) << "Failed to allocate " << required_bytes << " bytes";
+    return;
+  }
+
+#if defined(WIN32)
+  canvas_ = skia::CreatePlatformCanvasWithSharedSection(
+      viewport_pixel_size_.width(), viewport_pixel_size_.height(), false,
+      region.GetPlatformHandle(), skia::CRASH_ON_FAILURE);
+#else
+  shm_mapping_ = region.Map();
+  if (!shm_mapping_.IsValid()) {
+    DLOG(ERROR) << "Failed to map " << required_bytes << " bytes";
+    return;
+  }
+
+  canvas_ = skia::CreatePlatformCanvasWithPixels(
+      viewport_pixel_size_.width(), viewport_pixel_size_.height(), false,
+      static_cast<uint8_t*>(shm_mapping_.memory()), skia::CRASH_ON_FAILURE);
+#endif
+
+  // Transfer region ownership to the browser process.
+  layered_window_updater_->OnAllocatedSharedMemory(viewport_pixel_size_,
+                                                   std::move(region));
+}
+
+SkCanvas* SoftwareOutputDeviceProxy::BeginPaintDelegated() {
+  return canvas_.get();
+}
+
+void SoftwareOutputDeviceProxy::EndPaintDelegated(
+    const gfx::Rect& damage_rect) {
+  DCHECK(!waiting_on_draw_ack_);
+
+  if (!canvas_)
+    return;
+
+  layered_window_updater_->Draw(
+      damage_rect, base::BindOnce(&SoftwareOutputDeviceProxy::DrawAck,
+                                  base::Unretained(this)));
+  waiting_on_draw_ack_ = true;
+
+  TRACE_EVENT_ASYNC_BEGIN0("viz", "SoftwareOutputDeviceProxy::Draw", this);
+}
+
+void SoftwareOutputDeviceProxy::DrawAck() {
+  DCHECK(waiting_on_draw_ack_);
+  DCHECK(!swap_ack_callback_.is_null());
+
+  TRACE_EVENT_ASYNC_END0("viz", "SoftwareOutputDeviceProxy::Draw", this);
+
+  waiting_on_draw_ack_ = false;
+  std::move(swap_ack_callback_).Run(viewport_pixel_size_);
+}
+
+}  // namespace viz