xbmc/rendering/gl/ScreenshotSurfaceGL.cpp

   1 /*
   2  *  Copyright (C) 2005-2018 Team Kodi
   3  *  This file is part of Kodi - https://kodi.tv
   4  *
   5  *  SPDX-License-Identifier: GPL-2.0-or-later
   6  *  See LICENSES/README.md for more information.
   7  */
   8
   9 #include "ScreenshotSurfaceGL.h"
  10
  11 #include "ServiceBroker.h"
  12 #include "guilib/GUIComponent.h"
  13 #include "guilib/GUIWindowManager.h"
  14 #include "utils/Screenshot.h"
  15 #include "windowing/GraphicContext.h"
  16
  17 #include <mutex>
  18 #include <vector>
  19
  20 #include "system_gl.h"
  21
  22 void CScreenshotSurfaceGL::Register()
  23 {
  24   CScreenShot::Register(CScreenshotSurfaceGL::CreateSurface);
  25 }
  26
  27 std::unique_ptr<IScreenshotSurface> CScreenshotSurfaceGL::CreateSurface()
  28 {
  29   return std::unique_ptr<CScreenshotSurfaceGL>(new CScreenshotSurfaceGL());
  30 }
  31
  32 bool CScreenshotSurfaceGL::Capture()
  33 {
  34   CWinSystemBase* winsystem = CServiceBroker::GetWinSystem();
  35   if (!winsystem)
  36     return false;
  37
  38   CGUIComponent* gui = CServiceBroker::GetGUI();
  39   if (!gui)
  40     return false;
  41
  42   std::unique_lock<CCriticalSection> lock(winsystem->GetGfxContext());
  43   gui->GetWindowManager().Render();
  44
  45   glReadBuffer(GL_BACK);
  46
  47   // get current viewport
  48   GLint viewport[4];
  49   glGetIntegerv(GL_VIEWPORT, viewport);
  50
  51   m_width = viewport[2] - viewport[0];
  52   m_height = viewport[3] - viewport[1];
  53   m_stride = m_width * 4;
  54   std::vector<uint8_t> surface(m_stride * m_height);
  55
  56   // read pixels from the backbuffer
  57   glReadPixels(viewport[0], viewport[1], viewport[2], viewport[3], GL_BGRA, GL_UNSIGNED_BYTE, static_cast<GLvoid*>(surface.data()));
  58
  59   // make a new buffer and copy the read image to it with the Y axis inverted
  60   m_buffer = new unsigned char[m_stride * m_height];
  61   for (int y = 0; y < m_height; y++)
  62     memcpy(m_buffer + y * m_stride, surface.data() + (m_height - y - 1) * m_stride, m_stride);
  63
  64   return m_buffer != nullptr;
  65 }