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 <memory>
  18 #include <mutex>
  19 #include <vector>
  20
  21 #include "system_gl.h"
  22
  23 void CScreenshotSurfaceGL::Register()
  24 {
  25   CScreenShot::Register(CScreenshotSurfaceGL::CreateSurface);
  26 }
  27
  28 std::unique_ptr<IScreenshotSurface> CScreenshotSurfaceGL::CreateSurface()
  29 {
  30   return std::make_unique<CScreenshotSurfaceGL>();
  31 }
  32
  33 bool CScreenshotSurfaceGL::Capture()
  34 {
  35   CWinSystemBase* winsystem = CServiceBroker::GetWinSystem();
  36   if (!winsystem)
  37     return false;
  38
  39   CGUIComponent* gui = CServiceBroker::GetGUI();
  40   if (!gui)
  41     return false;
  42
  43   std::unique_lock<CCriticalSection> lock(winsystem->GetGfxContext());
  44   gui->GetWindowManager().Render();
  45
  46   glReadBuffer(GL_BACK);
  47
  48   // get current viewport
  49   GLint viewport[4];
  50   glGetIntegerv(GL_VIEWPORT, viewport);
  51
  52   m_width = viewport[2] - viewport[0];
  53   m_height = viewport[3] - viewport[1];
  54   m_stride = m_width * 4;
  55   std::vector<uint8_t> surface(m_stride * m_height);
  56
  57   // read pixels from the backbuffer
  58   glReadPixels(viewport[0], viewport[1], viewport[2], viewport[3], GL_BGRA, GL_UNSIGNED_BYTE, static_cast<GLvoid*>(surface.data()));
  59
  60   // make a new buffer and copy the read image to it with the Y axis inverted
  61   m_buffer = new unsigned char[m_stride * m_height];
  62   for (int y = 0; y < m_height; y++)
  63     memcpy(m_buffer + y * m_stride, surface.data() + (m_height - y - 1) * m_stride, m_stride);
  64
  65   return m_buffer != nullptr;
  66 }