xbmc/rendering/gles/ScreenshotSurfaceGLES.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 "ScreenshotSurfaceGLES.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 CScreenshotSurfaceGLES::Register()
  24 {
  25   CScreenShot::Register(CScreenshotSurfaceGLES::CreateSurface);
  26 }
  27
  28 std::unique_ptr<IScreenshotSurface> CScreenshotSurfaceGLES::CreateSurface()
  29 {
  30   return std::make_unique<CScreenshotSurfaceGLES>();
  31 }
  32
  33 bool CScreenshotSurfaceGLES::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   //get current viewport
  47   GLint viewport[4];
  48   glGetIntegerv(GL_VIEWPORT, viewport);
  49
  50   m_width = viewport[2] - viewport[0];
  51   m_height = viewport[3] - viewport[1];
  52   m_stride = m_width * 4;
  53   std::vector<uint8_t> surface(m_stride * m_height);
  54
  55   //read pixels from the backbuffer
  56   glReadPixels(viewport[0], viewport[1], viewport[2], viewport[3], GL_RGBA, GL_UNSIGNED_BYTE, static_cast<GLvoid*>(surface.data()));
  57
  58   //make a new buffer and copy the read image to it with the Y axis inverted
  59   m_buffer = new unsigned char[m_stride * m_height];
  60   for (int y = 0; y < m_height; y++)
  61   {
  62     // we need to save in BGRA order so XOR Swap RGBA -> BGRA
  63     unsigned char* swap_pixels = surface.data() + (m_height - y - 1) * m_stride;
  64     for (int x = 0; x < m_width; x++, swap_pixels += 4)
  65     {
  66       std::swap(swap_pixels[0], swap_pixels[2]);
  67     }
  68
  69     memcpy(m_buffer + y * m_stride, surface.data() + (m_height - y - 1) * m_stride, m_stride);
  70   }
  71
  72   return m_buffer != nullptr;
  73 }