src/screen.cpp

   1 #include "common.h"
   2 #include "screen.h"
   3
   4 #include "SDL_opengl.h"
   5
   6 using namespace IPDF;
   7 using namespace std;
   8
   9 Screen::Screen()
  10 {
  11         SDL_Init(SDL_INIT_VIDEO);
  12         m_window = SDL_CreateWindow("IPDF", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
  13                         800, 600, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
  14
  15         if (!m_window)
  16         {
  17                 Fatal("Couldn't create window!");
  18         }
  19
  20         m_gl_context = SDL_GL_CreateContext(m_window);
  21
  22         ResizeViewport(800, 600);
  23
  24 }
  25
  26 Screen::~Screen()
  27 {
  28         SDL_GL_DeleteContext(m_gl_context);
  29         SDL_DestroyWindow(m_window);
  30         SDL_Quit();
  31 }
  32
  33 void Screen::ResizeViewport(int width, int height)
  34 {
  35         glViewport(0, 0, width, height);
  36         m_viewport_width = width;
  37         m_viewport_height = height;
  38 }
  39
  40 bool Screen::PumpEvents()
  41 {
  42         SDL_Event evt;
  43         bool no_quit_requested = true;
  44         while (SDL_PollEvent(&evt))
  45         {
  46                 switch (evt.type)
  47                 {
  48                 case SDL_QUIT:
  49                         no_quit_requested = false;
  50                         break;
  51                 case SDL_WINDOWEVENT:
  52                         switch (evt.window.event)
  53                         {
  54                         case SDL_WINDOWEVENT_RESIZED:
  55                         case SDL_WINDOWEVENT_SIZE_CHANGED:
  56                                 ResizeViewport(evt.window.data1, evt.window.data2);
  57                                 break;
  58                         }
  59                         break;
  60                 case SDL_MOUSEMOTION:
  61                         m_last_mouse_x = evt.motion.x;
  62                         m_last_mouse_y = evt.motion.y;
  63                         if (m_mouse_handler)
  64                         {
  65                                 m_mouse_handler(evt.motion.x, evt.motion.y,evt.motion.state, 0);
  66                         }
  67                         break;
  68                 case SDL_MOUSEBUTTONDOWN:
  69                 case SDL_MOUSEBUTTONUP:
  70                         m_last_mouse_x = evt.button.x;
  71                         m_last_mouse_y = evt.button.y;
  72                         if (m_mouse_handler)
  73                         {
  74                                 m_mouse_handler(evt.button.x, evt.button.y, evt.button.state, 0);
  75                         }
  76                         break;
  77                 case SDL_MOUSEWHEEL:
  78                         if (m_mouse_handler)
  79                         {
  80                                 m_mouse_handler(m_last_mouse_x, m_last_mouse_y, 0, evt.wheel.y);
  81                         }
  82                         break;
  83                 case SDL_KEYDOWN:
  84                 {
  85                         Debug("Key %c down", (char)evt.key.keysym.sym);
  86                         if (isalnum((char)evt.key.keysym.sym))
  87                         {
  88                                 char filename[] = "0.bmp";
  89                                 filename[0] = (char)evt.key.keysym.sym;
  90                                 ScreenShot(filename);
  91                         }
  92                 }
  93                 default:
  94                         break;
  95                 }
  96         }
  97         return no_quit_requested;
  98 }
  99
 100 void Screen::SetMouseCursor(Screen::MouseCursors cursor)
 101 {
 102         SDL_SystemCursor system_cursor_id = SDL_SYSTEM_CURSOR_ARROW;
 103         switch (cursor)
 104         {
 105         case CursorArrow: system_cursor_id = SDL_SYSTEM_CURSOR_ARROW; break;
 106         case CursorWait: system_cursor_id = SDL_SYSTEM_CURSOR_WAIT; break;
 107         case CursorWaitArrow: system_cursor_id = SDL_SYSTEM_CURSOR_WAITARROW; break;
 108         case CursorMove: system_cursor_id = SDL_SYSTEM_CURSOR_SIZEALL; break;
 109         case CursorHand: system_cursor_id = SDL_SYSTEM_CURSOR_HAND; break;
 110         default: break;
 111         }
 112         SDL_Cursor *system_cursor = SDL_CreateSystemCursor(system_cursor_id);
 113         SDL_SetCursor(system_cursor);
 114         //TODO: Check if we need to free the system cursors.
 115 }
 116
 117 void Screen::Present()
 118 {
 119         SDL_GL_SwapWindow(m_window);
 120 }
 121
 122 void Screen::ScreenShot(const char * filename) const
 123 {
 124         Debug("Attempting to save BMP to file %s", filename);
 125
 126         int w = ViewportWidth();
 127         int h = ViewportHeight();
 128         unsigned char * pixels = new unsigned char[w*h*4];
 129         if (pixels == NULL)
 130                 Fatal("Failed to allocate %d x %d x 4 = %d pixel array", w, h, w*h*4);
 131
 132         glReadPixels(0,0,w, h, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
 133
 134         SDL_Surface * surf = SDL_CreateRGBSurfaceFrom(pixels, w, h, 8*4, w*4, 0,0,0,0);
 135         if (surf == NULL)
 136                 Fatal("Failed to create SDL_Surface from pixel data - %s", SDL_GetError());
 137
 138         if (SDL_SaveBMP(surf, filename) != 0)
 139                 Fatal("SDL_SaveBMP failed - %s", SDL_GetError());
 140
 141         SDL_FreeSurface(surf);
 142         delete [] pixels;
 143         Debug("Succeeded!");
 144 }