path: root/src/SourceWin32.cxx

namespace PluggIt {

D_DEBUG_DOMAIN( PluggIt_SourceWin32, "PluggIt/SourceWin32", "PluggIt Source Win32" );


#include "ScreenHooks.h"

const UINT specIpcCode = RegisterWindowMessage("HOOK.MESSAGE.CODE");


class SourceWin32 extends Source, Runnable
{
     private HINSTANCE        m_hInstance;

     private HWND             m_root;
     private HWND             m_window;

     private DFBPoint         m_position;
     private DFBDimension     m_size;

     private HBITMAP          m_bitmap;
     private void            *m_pixels;
     private int              m_pitch;

     private HBITMAP          m_bitmap2;
     private void            *m_pixels2;
     private int              m_pitch2;

     private HDC              m_window_dc;
     private HDC              m_bitmap_dc;
     private HDC              m_bitmap_dc2;

     private Thread          *m_thread;

     private Updates          m_updates;

     private VIDEODRIVER      m_driver;
     private bool             m_using_driver;

     private pthread_mutex_t  m_lock;
     private pthread_cond_t   m_cond;


     public class Config extends Source::Config {
          friend class SourceWin32;

          public typedef enum {
               WINDOW_SELECTION_NONE,
               WINDOW_SELECTION_TITLE,
               WINDOW_SELECTION_INTERACTIVE
          } WindowSelection;

          private WindowSelection m_selection;
          private std::string     m_title;
          private bool            m_updating;
          private bool            m_use_driver;


          public Config( WindowSelection selection,
                         const std::string &title = std::string(),
                         bool updating = false, bool use_driver = true )
          {
               m_selection  = selection;
               m_title      = title;
               m_updating   = updating;
               m_use_driver = use_driver;
          }
     };


     public SourceWin32( View *view, const Config &config ) : Source( view, config ), m_updates(16) {
          D_DEBUG_AT( PluggIt_SourceWin32, "%s( %p )\n", __FUNCTION__, view );

          m_hInstance = GetModuleHandle( NULL );

          D_DEBUG_AT( PluggIt_SourceWin32, "  -> hInstance %p\n", m_hInstance );


          m_root = GetDesktopWindow();

          switch (config.m_selection) {
               case Config::WINDOW_SELECTION_NONE:
                    m_window = m_root;
                    break;

               case Config::WINDOW_SELECTION_TITLE:
                    m_window = findWindow( config.m_title );
                    if (m_window == 0)
                         throw new Exception( "Could not find window with title containing '%s'\n", config.m_title.c_str() );
                    break;

               case Config::WINDOW_SELECTION_INTERACTIVE:
                    pickWindow();
                    if (m_window == 0)
                         throw new Exception( "Could not interactively pick a window\n" );
                    break;

               default:
                    throw new Exception( "Invalid window selection method\n" );
          }


          RECT rect;

          GetClientRect( m_window, &rect );

          m_position.x = rect.left;
          m_position.y = rect.top;

          m_size.w = rect.right  - rect.left;
          m_size.h = rect.bottom - rect.top;

          queueUpdate( 0, 0, m_size.w - 1, m_size.h - 1 );


          std::string t = getWindowTitle( m_window );

          D_INFO( "Source/Win32: Window %d,%d-%ux%u, name '%s'\n",
                  m_position.x, m_position.y, m_size.w, m_size.h, t.c_str() );

          if (config.m_use_driver)
               m_driver.VIDEODRIVER_start( m_position.x, m_position.y, m_size.w, m_size.h );

          m_using_driver = m_driver.mypchangebuf != NULL;

          m_view->config( m_size );


          m_window_dc  = GetDC( m_window );
          m_bitmap_dc  = CreateCompatibleDC( m_window_dc );
          m_bitmap_dc2 = CreateCompatibleDC( m_window_dc );


          BITMAPINFO bitmap_info = {{
               biSize:           sizeof(BITMAPINFOHEADER),
               biWidth:          m_size.w,
               biHeight:         m_size.h,
               biPlanes:         1,
               biBitCount:       32,
               biCompression:    BI_RGB,
               biSizeImage:      0,
               biXPelsPerMeter:  0,
               biYPelsPerMeter:  0,
               biClrUsed:        0,
               biClrImportant:   0,
          }};

          m_bitmap  = CreateDIBSection( m_window_dc, &bitmap_info, DIB_RGB_COLORS, &m_pixels, NULL, 0 );
          m_bitmap2 = CreateDIBSection( m_window_dc, &bitmap_info, DIB_RGB_COLORS, &m_pixels2, NULL, 0 );


          BITMAP bitmap;

          GetObject( m_bitmap, sizeof(BITMAP), &bitmap );

          m_pitch = bitmap.bmWidthBytes;

          GetObject( m_bitmap2, sizeof(BITMAP), &bitmap );

          m_pitch2 = bitmap.bmWidthBytes;


          SelectObject( m_bitmap_dc, m_bitmap );
          SelectObject( m_bitmap_dc2, m_bitmap2 );


          pthread_mutex_init( &m_lock, NULL );
          pthread_cond_init( &m_cond, NULL );


          if (!m_using_driver) {
               HWND w;

               WNDCLASSEX wndClass;

               ZeroMemory( &wndClass, sizeof(wndClass) );

               wndClass.cbSize        = sizeof(wndClass);
               wndClass.style         = CS_HREDRAW | CS_VREDRAW;
               wndClass.lpfnWndProc   = MsgWndProc;
               wndClass.cbClsExtra    = 0;
               wndClass.cbWndExtra    = 0;
               wndClass.hInstance     = GetModuleHandle(NULL);
               wndClass.hIcon         = NULL;
               wndClass.hIconSm       = NULL;
               wndClass.hCursor       = LoadCursor( NULL, IDC_UPARROW );
               wndClass.hbrBackground = (HBRUSH) GetStockObject( NULL_BRUSH );
               wndClass.lpszMenuName  = NULL;
               wndClass.lpszClassName = "MsgWindow";

               if (!RegisterClassEx( &wndClass ))
                    throw new Exception( "RegisterClassEx() failed!" );


               w = CreateWindowEx( 0,
                                   "MsgWindow",
                                   "MsgWindow",
                                   WS_POPUP,// | WS_CLIPSIBLINGS | WS_CLIPCHILDREN | WS_BORDER,
                                   CW_USEDEFAULT,
                                   CW_USEDEFAULT,
                                   1,
                                   1,
                                   NULL,
                                   NULL,
                                   GetModuleHandle(NULL),
                                   this );

               if (!setHook( w ))
                    throw new Exception( "Failed to set hooks!" );
          }


          /* Create the thread object. */
          m_thread = new Thread( this, "SourceWin32" );

          m_thread->start();
     }

     virtual ~SourceWin32() {
          m_thread->interrupt();
          m_thread->join();
          delete m_thread;

          pthread_mutex_destroy( &m_lock );
          pthread_cond_destroy( &m_cond );

          DeleteDC( m_window_dc );
          DeleteDC( m_bitmap_dc );
          DeleteDC( m_bitmap_dc2 );

          DeleteObject( m_bitmap );
          DeleteObject( m_bitmap2 );
     }

     private void addRect( const RECT &rect ) {
          if (rect.left >= rect.right)
               return;

          if (rect.top >= rect.bottom)
               return;

          DFBRegion region( rect.left,
                            rect.top,
                            rect.right - 1,
                            rect.bottom - 1 );

          m_updates.addRegion( region );
     }

     private void run() {
          if (m_using_driver) {
               D_ASSERT( m_driver.mypchangebuf != NULL );

               unsigned int counter = m_driver.mypchangebuf->counter;
               unsigned int i;

               long long last_time = direct_clock_get_abs_millis();

               D_DEBUG_AT( PluggIt_SourceWin32, "%s()\n", __FUNCTION__ );

               while (!m_thread->isInterrupted()) {
                    if (m_driver.mypchangebuf->counter < 1 ||
                        m_driver.mypchangebuf->counter >= MAXCHANGES_BUF ||
                        counter == m_driver.mypchangebuf->counter)
                         usleep( 10000 );

                    if (counter != m_driver.mypchangebuf->counter) {
                         D_DEBUG_AT( PluggIt_SourceWin32, "  -> counter: %d -> %d\n", counter, m_driver.mypchangebuf->counter );

                         if (counter < m_driver.mypchangebuf->counter) {
                              for (i=counter+1; i<=m_driver.mypchangebuf->counter; i++) {
                                   addRect( m_driver.mypchangebuf->pointrect[i].rect );
                              }
                         }
                         else if (counter > m_driver.mypchangebuf->counter) {
                              for (i=counter+1; i<MAXCHANGES_BUF; i++) {
                                   addRect( m_driver.mypchangebuf->pointrect[i].rect );
                              }
                              for (i=1; i<=m_driver.mypchangebuf->counter; i++) {
                                   addRect( m_driver.mypchangebuf->pointrect[i].rect );
                              }
                         }

                         counter = m_driver.mypchangebuf->counter;
                    }

                    if (direct_clock_get_abs_millis() - last_time > 2000) {
                         DFBRegion region( 0,
                                           0,
                                           m_size.w - 1,
                                           m_size.h - 1 );

                         m_updates.addRegion( region );

                         last_time = direct_clock_get_abs_millis();
                    }

                    if (m_updates.num_regions() > 0) {
                         vector<DFBRectangle_C> rects;

                         m_updates.GetRectangles( rects );


                         const DFBRegion &bounding = m_updates.bounding();

                         D_DEBUG_AT( PluggIt_SourceWin32, "  -> %4d,%4d-%4dx%4d (%d regions, %d rectangles)\n",
                                     DFB_RECTANGLE_VALS_FROM_REGION( &bounding ), m_updates.num_regions(), rects.size() );

                         m_updates.reset();

                         flushUpdates( rects );
                    }
               }
          }
          else {
               D_DEBUG_AT( PluggIt_SourceWin32, "%s()\n", __FUNCTION__ );

               long long last_time = direct_clock_get_abs_millis();

               while (!m_thread->isInterrupted()) {
                    if (((const Config&)m_config).m_updating) {
                         usleep( 100000 );

                         queueUpdate( 0, 0, m_size.w - 1, m_size.h - 1 );

                         pthread_mutex_lock( &m_lock );
                    }
                    else {
                         pthread_mutex_lock( &m_lock );

                         if (m_updates.num_regions() == 0)
                              usleep( 10000 );
                              //pthread_cond_wait( &m_cond, &m_lock );
                    }

                    if (direct_clock_get_abs_millis() - last_time > 2000) {
                         DFBRegion region( 0,
                                           0,
                                           m_size.w - 1,
                                           m_size.h - 1 );

                         m_updates.addRegion( region );

                         last_time = direct_clock_get_abs_millis();
                    }


                    vector<DFBRectangle_C> rects;

                    if (m_updates.num_regions() > 0) {
                         m_updates.GetRectangles( rects );


                         const DFBRegion &bounding = m_updates.bounding();

                         D_DEBUG_AT( PluggIt_SourceWin32, "  -> %4d,%4d-%4dx%4d (%d regions, %d rectangles)\n",
                                     DFB_RECTANGLE_VALS_FROM_REGION( &bounding ), m_updates.num_regions(), rects.size() );

                         m_updates.reset();
                    }

                    pthread_mutex_unlock( &m_lock );

                    if (!rects.empty())
                         flushUpdates( rects );
               }
          }
     }

/**********************************************************************************************************************/

     private void queueUpdate( int x1, int y1, int x2, int y2 ) {
          D_DEBUG_AT( PluggIt_SourceWin32, "%s( %d,%d-%dx%d )\n", __FUNCTION__, x1, y1, x2 - x1 + 1, y2 - y1 + 1 );

          pthread_mutex_lock( &m_lock );

          DFBRegion damage( x1, y1, x2, y2 );

          m_updates.addRegion( damage );

          pthread_mutex_unlock( &m_lock );

          pthread_cond_signal( &m_cond );
     }

     private bool flushUpdates( vector<DFBRectangle_C> &rects ) {
          D_DEBUG_AT( PluggIt_SourceWin32, "%s()\n", __FUNCTION__ );

          if (m_using_driver) {
               m_view->update( rects, m_driver.myframebuffer, m_pitch );
          }
          else {
               for (unsigned int i=0; i<rects.size(); i++) {
                    BitBlt( m_bitmap_dc,
                            rects[i].x,
                            rects[i].y,
                            rects[i].w,
                            rects[i].h,
                            m_window_dc,
                            rects[i].x,
                            rects[i].y,
                            SRCCOPY );
               }

               m_view->update( rects, (void*)((char*) m_pixels + m_pitch * (m_size.h - 1)), - m_pitch );
          }

          D_DEBUG_AT( PluggIt_SourceWin32, "  -> flush done\n" );

          return true;
     }



/**********************************************************************************************************************/

     private static std::string getWindowTitle( HWND window ) {
          char buf[1024] = { 0 };

          GetWindowText( window, buf, sizeof(buf) );

          D_DEBUG_AT( PluggIt_SourceWin32, "%s( %p ) -> '%s'\n", __FUNCTION__, window, buf );

          return buf;
     }


/**********************************************************************************************************************/

     class EnumContext {
          public const std::string &title;
          public HWND               window;

          public EnumContext( const std::string &title ) : title(title), window(0) {}
     };

     private static BOOL CALLBACK enumWindowsProc( HWND   hwnd,
                                                   LPARAM lParam )
     {
          EnumContext *ctx = reinterpret_cast<EnumContext *>( lParam );

          D_DEBUG_AT( PluggIt_SourceWin32, "%s( %p )\n", __FUNCTION__, hwnd );

          std::string title = getWindowTitle( hwnd );

          if (title == ctx->title || title.find( ctx->title ) < title.size())
               ctx->window = hwnd;

          return ctx->window == NULL;
     }

     private HWND findWindow( const std::string &title ) {
          D_DEBUG_AT( PluggIt_SourceWin32, "%s( %s )\n", __FUNCTION__, title.c_str() );

          EnumContext ctx( title );

          EnumWindows( enumWindowsProc, reinterpret_cast<LPARAM>( &ctx ) );

          return ctx.window;
     }


/**********************************************************************************************************************/

     static LRESULT CALLBACK WndProc( HWND hwnd,        // handle to window
                                      UINT uMsg,        // message identifier
                                      WPARAM wParam,    // first message parameter
                                      LPARAM lParam )   // second message parameter
     {
          static SourceWin32 *thiz;
          POINT               point;
          CREATESTRUCT       *create;

          switch (uMsg) {
               case WM_CREATE:
                    create = reinterpret_cast<LPCREATESTRUCT>( lParam );
                    thiz   = reinterpret_cast<SourceWin32 *>( create->lpCreateParams );

                    SetCursor( LoadCursor( NULL, IDC_CROSS ) );
                    break;

               case WM_LBUTTONDOWN:
                    ShowWindow( hwnd, SW_HIDE );


                    GetCursorPos( &point );

                    D_DEBUG_AT( PluggIt_SourceWin32, "  -> Cursor position is %ld,%ld\n", point.x, point.y );


                    thiz->m_window = WindowFromPoint( point );
                    if (thiz->m_window) {
                         HWND parent;

                         while ((parent = GetParent( thiz->m_window )) != NULL)
                              thiz->m_window = parent;
                    }

                    D_DEBUG_AT( PluggIt_SourceWin32, "  -> Window at cursor is %p: %s\n",
                                thiz->m_window, getWindowTitle( thiz->m_window ).c_str() );

                    DestroyWindow( hwnd );
                    break;
 
               case WM_TIMER:
                    if (wParam == 666)
                         DestroyWindow( hwnd );
                    break;

               case WM_DESTROY:
                    KillTimer( hwnd, 666 );
                    PostQuitMessage( 0 );
                    break;
 
              default:
                   SetTimer( hwnd, 666, 5000, NULL );

                   return DefWindowProc( hwnd, uMsg, wParam, lParam );
          }
 
          return 0;
     }

     private void pickWindow() {
          D_DEBUG_AT( PluggIt_SourceWin32, "%s()\n", __FUNCTION__ );

          HDC hdc;

          hdc = GetDC( NULL );
          if (!hdc)
               throw new Exception( "GetDC() returned NULL" );

          RECT rect;

          GetClipBox( hdc, &rect );

          D_DEBUG_AT( PluggIt_SourceWin32, "  -> Desktop size: %ldx%ld\n",
                      rect.right - rect.left, rect.bottom - rect.top );

          ReleaseDC( NULL, hdc );



          WNDCLASSEX wndClass;

          ZeroMemory( &wndClass, sizeof(wndClass) );

          wndClass.cbSize        = sizeof(wndClass);
          wndClass.style         = CS_HREDRAW | CS_VREDRAW;
          wndClass.lpfnWndProc   = WndProc;
          wndClass.cbClsExtra    = 0;
          wndClass.cbWndExtra    = 0;
          wndClass.hInstance     = m_hInstance;
          wndClass.hIcon         = NULL;
          wndClass.hIconSm       = NULL;
          wndClass.hCursor       = LoadCursor( NULL, IDC_UPARROW );
          wndClass.hbrBackground = (HBRUSH) GetStockObject( NULL_BRUSH );
          wndClass.lpszMenuName  = NULL;
          wndClass.lpszClassName = "GrabWindow";

          if (!RegisterClassEx( &wndClass ))
               throw new Exception( "RegisterClassEx() failed!\n" );


          AdjustWindowRect( &rect, WS_CAPTION, FALSE );


          HWND grabwin;

          grabwin = CreateWindowEx( 0,
                                    "GrabWindow",
                                    "GrabWindow",
                                    WS_POPUP,// | WS_CLIPSIBLINGS | WS_CLIPCHILDREN | WS_BORDER,
                                    CW_USEDEFAULT,
                                    CW_USEDEFAULT,
                                    rect.right  - rect.left,
                                    rect.bottom - rect.top,
                                    NULL,
                                    NULL,
                                    m_hInstance,
                                    this );

          SetWindowLong( grabwin, GWL_EXSTYLE,
                         GetWindowLong( grabwin, GWL_EXSTYLE ) | WS_EX_TRANSPARENT | WS_EX_TOPMOST );

          ShowWindow( grabwin, SW_SHOW );



          MSG msg;

          while (GetMessage( &msg, 0, 0, 0 )) {
               TranslateMessage( &msg );

               D_DEBUG_AT( PluggIt_SourceWin32, "  -> Dispatching event (id %u)...\n", msg.message );

               DispatchMessage( &msg );
          }
     }

/**********************************************************************************************************************/

     static LRESULT CALLBACK MsgWndProc( HWND hwnd,        // handle to window
                                         UINT uMsg,        // message identifier
                                         WPARAM wParam,    // first message parameter
                                         LPARAM lParam )   // second message parameter
     {
          static SourceWin32 *thiz;
          CREATESTRUCT       *create;

          switch (uMsg) {
               case WM_CREATE:
                    create = reinterpret_cast<LPCREATESTRUCT>( lParam );
                    thiz   = reinterpret_cast<SourceWin32 *>( create->lpCreateParams );
                    break;

               case WM_DESTROY:
                    PostQuitMessage( 0 );
                    break;

               default:
                    if (uMsg == specIpcCode) {
                         int x1 = wParam >> 16;
                         int y1 = wParam & 0xffff;
                         int x2 = lParam >> 16;
                         int y2 = lParam & 0xffff;

                         if (x1 < x2 && y1 < y2)
                              thiz->queueUpdate( x1, y1, x2 - 1, y2 - 1 );

                         break;
                    }

                    return DefWindowProc( hwnd, uMsg, wParam, lParam );
          }

          return 0;
     }

     public virtual int MainLoop() {
          MSG msg;

          while (GetMessage( &msg, 0, 0, 0 )) {
               TranslateMessage( &msg );
               DispatchMessage( &msg );
          }

          return 0;
     }
};

}