Repo created

TMessagesProj/jni/voip/webrtc/modules/desktop_capture/desktop_frame.cc

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+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "modules/desktop_capture/desktop_frame.h"
+
+#include <string.h>
+
+#include <cmath>
+#include <memory>
+#include <utility>
+
+#include "modules/desktop_capture/desktop_capture_types.h"
+#include "modules/desktop_capture/desktop_geometry.h"
+#include "rtc_base/checks.h"
+#include "third_party/libyuv/include/libyuv/planar_functions.h"
+
+namespace webrtc {
+
+DesktopFrame::DesktopFrame(DesktopSize size,
+                           int stride,
+                           uint8_t* data,
+                           SharedMemory* shared_memory)
+    : data_(data),
+      shared_memory_(shared_memory),
+      size_(size),
+      stride_(stride),
+      capture_time_ms_(0),
+      capturer_id_(DesktopCapturerId::kUnknown) {
+  RTC_DCHECK(size_.width() >= 0);
+  RTC_DCHECK(size_.height() >= 0);
+}
+
+DesktopFrame::~DesktopFrame() = default;
+
+void DesktopFrame::CopyPixelsFrom(const uint8_t* src_buffer,
+                                  int src_stride,
+                                  const DesktopRect& dest_rect) {
+  RTC_CHECK(DesktopRect::MakeSize(size()).ContainsRect(dest_rect));
+
+  uint8_t* dest = GetFrameDataAtPos(dest_rect.top_left());
+  libyuv::CopyPlane(src_buffer, src_stride, dest, stride(),
+                    DesktopFrame::kBytesPerPixel * dest_rect.width(),
+                    dest_rect.height());
+}
+
+void DesktopFrame::CopyPixelsFrom(const DesktopFrame& src_frame,
+                                  const DesktopVector& src_pos,
+                                  const DesktopRect& dest_rect) {
+  RTC_CHECK(DesktopRect::MakeSize(src_frame.size())
+                .ContainsRect(
+                    DesktopRect::MakeOriginSize(src_pos, dest_rect.size())));
+
+  CopyPixelsFrom(src_frame.GetFrameDataAtPos(src_pos), src_frame.stride(),
+                 dest_rect);
+}
+
+bool DesktopFrame::CopyIntersectingPixelsFrom(const DesktopFrame& src_frame,
+                                              double horizontal_scale,
+                                              double vertical_scale) {
+  const DesktopVector& origin = top_left();
+  const DesktopVector& src_frame_origin = src_frame.top_left();
+
+  DesktopVector src_frame_offset = src_frame_origin.subtract(origin);
+
+  // Determine the intersection, first adjusting its origin to account for any
+  // DPI scaling.
+  DesktopRect intersection_rect = src_frame.rect();
+  if (horizontal_scale != 1.0 || vertical_scale != 1.0) {
+    DesktopVector origin_adjustment(
+        static_cast<int>(
+            std::round((horizontal_scale - 1.0) * src_frame_offset.x())),
+        static_cast<int>(
+            std::round((vertical_scale - 1.0) * src_frame_offset.y())));
+
+    intersection_rect.Translate(origin_adjustment);
+
+    src_frame_offset = src_frame_offset.add(origin_adjustment);
+  }
+
+  intersection_rect.IntersectWith(rect());
+  if (intersection_rect.is_empty()) {
+    return false;
+  }
+
+  // Translate the intersection rect to be relative to the outer rect.
+  intersection_rect.Translate(-origin.x(), -origin.y());
+
+  // Determine source position for the copy (offsets of outer frame from
+  // source origin, if positive).
+  int32_t src_pos_x = std::max(0, -src_frame_offset.x());
+  int32_t src_pos_y = std::max(0, -src_frame_offset.y());
+
+  CopyPixelsFrom(src_frame, DesktopVector(src_pos_x, src_pos_y),
+                 intersection_rect);
+  return true;
+}
+
+DesktopRect DesktopFrame::rect() const {
+  const float scale = scale_factor();
+  // Only scale the size.
+  return DesktopRect::MakeXYWH(top_left().x(), top_left().y(),
+                               size().width() / scale, size().height() / scale);
+}
+
+float DesktopFrame::scale_factor() const {
+  float scale = 1.0f;
+
+#if defined(WEBRTC_MAC) || defined(CHROMEOS)
+  // At least on Windows the logical and physical pixel are the same
+  // See http://crbug.com/948362.
+  if (!dpi().is_zero() && dpi().x() == dpi().y())
+    scale = dpi().x() / kStandardDPI;
+#endif
+
+  return scale;
+}
+
+uint8_t* DesktopFrame::GetFrameDataAtPos(const DesktopVector& pos) const {
+  return data() + stride() * pos.y() + DesktopFrame::kBytesPerPixel * pos.x();
+}
+
+void DesktopFrame::CopyFrameInfoFrom(const DesktopFrame& other) {
+  set_dpi(other.dpi());
+  set_capture_time_ms(other.capture_time_ms());
+  set_capturer_id(other.capturer_id());
+  *mutable_updated_region() = other.updated_region();
+  set_top_left(other.top_left());
+  set_icc_profile(other.icc_profile());
+  set_may_contain_cursor(other.may_contain_cursor());
+}
+
+void DesktopFrame::MoveFrameInfoFrom(DesktopFrame* other) {
+  set_dpi(other->dpi());
+  set_capture_time_ms(other->capture_time_ms());
+  set_capturer_id(other->capturer_id());
+  mutable_updated_region()->Swap(other->mutable_updated_region());
+  set_top_left(other->top_left());
+  set_icc_profile(other->icc_profile());
+  set_may_contain_cursor(other->may_contain_cursor());
+}
+
+bool DesktopFrame::FrameDataIsBlack() const {
+  if (size().is_empty())
+    return false;
+
+  uint32_t* pixel = reinterpret_cast<uint32_t*>(data());
+  for (int i = 0; i < size().width() * size().height(); ++i) {
+    if (*pixel++)
+      return false;
+  }
+  return true;
+}
+
+void DesktopFrame::SetFrameDataToBlack() {
+  const uint8_t kBlackPixelValue = 0x00;
+  memset(data(), kBlackPixelValue, stride() * size().height());
+}
+
+BasicDesktopFrame::BasicDesktopFrame(DesktopSize size)
+    : DesktopFrame(size,
+                   kBytesPerPixel * size.width(),
+                   new uint8_t[kBytesPerPixel * size.width() * size.height()](),
+                   nullptr) {}
+
+BasicDesktopFrame::~BasicDesktopFrame() {
+  delete[] data_;
+}
+
+// static
+DesktopFrame* BasicDesktopFrame::CopyOf(const DesktopFrame& frame) {
+  DesktopFrame* result = new BasicDesktopFrame(frame.size());
+  // TODO(crbug.com/1330019): Temporary workaround for a known libyuv crash when
+  // the height or width is 0. Remove this once this change has been merged.
+  if (frame.size().width() && frame.size().height()) {
+    libyuv::CopyPlane(frame.data(), frame.stride(), result->data(),
+                      result->stride(), frame.size().width() * kBytesPerPixel,
+                      frame.size().height());
+  }
+  result->CopyFrameInfoFrom(frame);
+  return result;
+}
+
+// static
+std::unique_ptr<DesktopFrame> SharedMemoryDesktopFrame::Create(
+    DesktopSize size,
+    SharedMemoryFactory* shared_memory_factory) {
+  RTC_DCHECK(shared_memory_factory);
+
+  size_t buffer_size = size.height() * size.width() * kBytesPerPixel;
+  std::unique_ptr<SharedMemory> shared_memory =
+      shared_memory_factory->CreateSharedMemory(buffer_size);
+  if (!shared_memory)
+    return nullptr;
+
+  return std::make_unique<SharedMemoryDesktopFrame>(
+      size, size.width() * kBytesPerPixel, std::move(shared_memory));
+}
+
+SharedMemoryDesktopFrame::SharedMemoryDesktopFrame(DesktopSize size,
+                                                   int stride,
+                                                   SharedMemory* shared_memory)
+    : DesktopFrame(size,
+                   stride,
+                   reinterpret_cast<uint8_t*>(shared_memory->data()),
+                   shared_memory) {}
+
+SharedMemoryDesktopFrame::SharedMemoryDesktopFrame(
+    DesktopSize size,
+    int stride,
+    std::unique_ptr<SharedMemory> shared_memory)
+    : SharedMemoryDesktopFrame(size, stride, shared_memory.release()) {}
+
+SharedMemoryDesktopFrame::~SharedMemoryDesktopFrame() {
+  delete shared_memory_;
+}
+
+}  // namespace webrtc