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scopedisplayer.cpp

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

Copyright (c) 2001 Charles Samuels <charles@kde.org>
              2001 Neil Stevens <multivac@fcmail.com>
              With code stolen from Paul Harrison <pfh@yoyo.cc.monash.edu.au>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIAB\ILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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

#include "sdlscope.h"

#if 0
#define TEST() cout << "At line "  << __LINE__ << endl
#else
#define TEST() if(0)
#endif

#define output ((unsigned char*)data)     
template <class Type>
inline void Bitmap<Type>::addPixel(int x, int y, int br1, int br2)
{
      if (x < 0 || x >= width || y < 0 || y >= height) return;

      register unsigned char *p = output+x*2+y*width*2;
      if (p[0] < 255-br1) p[0] += br1; else p[0] = 255;
      if (p[1] < 255-br2) p[1] += br2; else p[1] = 255;
}

template <class Type>
void Bitmap<Type>::addVertLine(int x, int y1, int y2, int br1, int br2)
{
      if(y1 < y2)
      {
            for(int y = y1; y <= y2; y++)
                  addPixel(x,y, br1, br2);
      }
      else if(y2 < y1)
      {
            for(int y = y2; y <= y1; y++)
                  addPixel(x, y, br1, br2);
      }
      else
      {
            addPixel(x, y1, br1, br2);
      }
}

template <class Type>
void Bitmap<Type>::fadeStar()
{
      register unsigned long *ptr = (unsigned long*)output;
      int i = width*height*2/4;
      do
      {
            if (*ptr)
                  *(ptr++) -= ((*ptr & 0xf0f0f0f0ul) >> 4) + ((*ptr & 0xe0e0e0e0ul) >> 5);
            else 
                  ptr++;
      } while(--i > 0);
}

SDLView::SDLView(int in) : mFd(in), outputBmp(0), fullscreen(false)
{
      surface = 0;
      width = 320;
      height = width*6/8;
      outputBmp.size(width, height);
      TEST();
      
      TEST();
      fcntl(mFd, F_SETFL, fcntl(mFd, F_GETFL) & ~O_NONBLOCK);
      TEST();


      float *data = new float[width];
      TEST();

      startVideo();
      setupPalette();
      TEST();

      while(true)
      {
            checkInput();

            if(!surface) exit(0);

            int bytestoread = width * sizeof(float);
            int pos = 0;
            while(pos < bytestoread)
            {
                  char *d = (char *)data;
                  int r = read(mFd, d + pos, bytestoread - pos);
                  if(r > 0) pos += r;
                  else if (r==0) exit(0);
            }

            outputBmp.fadeStar();
            outputBmp.fadeStar();

            float *d = data;
            float *end = data + width;
            float heightHalf = height / 4.0;
            int y = height / 2;
            int x=0;
            int oldy=(int)(*d * heightHalf);
            while(d <= end)
            {
                  int amp = (int)(*d * heightHalf);
                  amp+=y;
                  
                  outputBmp.addVertLine(x, oldy, amp, 255, 255);
                  oldy=amp;
                  
                  d++;
                  x++;
            }
            repaint();
      }
}

static SDL_Surface *CreateScreen(Uint16 w, Uint16 h, Uint8 bpp, Uint32 flags)
{
      SDL_Surface *screen;

      // Set the video mode
      screen = SDL_SetVideoMode(w, h, bpp, flags);
      return screen;
}

void SDLView::startVideo()
{
      if(surface)
      {
            SDL_FreeSurface(surface);
            surface = 0;
      }

      Uint32 videoflags;

      /* Initialize SDL */
      if ( SDL_Init(SDL_INIT_VIDEO) < 0 )
            exit(0);

      SDL_WM_SetCaption("BlurScope","blurscope");

      /* See if we try to get a hardware colormap */
      videoflags = SDL_SWSURFACE | (fullscreen?SDL_FULLSCREEN:0);

      surface = CreateScreen(width, height, 8, videoflags);
      if (!surface)
            exit(0);
      
      SDL_ShowCursor(0);

      if(!surface)
            SDL_Quit();

      SDL_WM_SetCaption("BlurScope", 0);
      SDL_ShowCursor(0);

}

void SDLView::setupPalette(double)
{
#define BOUND(x) ((x) > 255 ? 255 : (x))
#define PEAKIFY(x) int(BOUND((x) - (x)*(255-(x))/255/2))
#define MAX(x,y) ((x) > (y) ? (x) : (y))

      int redMax=136;
      int greenMax=136;
      int blueMax=255;
      
      SDL_Color sdlPalette[256];

      for(int i=0;i<256;i++)
      {
            // i
            // 255 136
            sdlPalette[i].r = i*redMax/255;
            sdlPalette[i].g = i*greenMax/255;
            sdlPalette[i].b = i*blueMax/255;
      }

      SDL_SetColors(surface, sdlPalette, 0, 256);

#undef BOUND
#undef PEAKIFY
#undef MAX
}

void SDLView::checkInput()
{
      SDL_Event myEvent;

      while(SDL_PollEvent(&myEvent))
      {
            switch(myEvent.type)
            {
            case SDL_KEYDOWN:
                  switch(myEvent.key.keysym.sym)
                  {
                  case SDLK_SPACE:
//                      fullscreen ^= true;
//                      startVideo();
                        break;
                  default:
                        break;
                  }
                  break;

            case SDL_QUIT:
                  exit(0);
                  break;
            }
      }
}

#define output2 ((unsigned char*)outputBmp.data)

void SDLView::repaint()
{
      SDL_LockSurface(surface);
      TEST();

      register unsigned long *ptr2 = (unsigned long*)output2;
      unsigned long *ptr1 = (unsigned long*)( surface->pixels );
      int i = width*height/4;
      TEST();

      do {
            // Asger Alstrup Nielsen's (alstrup@diku.dk)
            // optimized 32 bit screen loop
            register unsigned int const r1 = *(ptr2++);
            register unsigned int const r2 = *(ptr2++);

            //if (r1 || r2) {
#ifdef LITTLEENDIAN
            register unsigned int const v =
                  ((r1 & 0x000000f0ul) >> 4)
                  | ((r1 & 0x0000f000ul) >> 8)
                  | ((r1 & 0x00f00000ul) >> 12)
                  | ((r1 & 0xf0000000ul) >> 16);
            *(ptr1++) = v |
                  ( ((r2 & 0x000000f0ul) << 12)
                    | ((r2 & 0x0000f000ul) << 8)
                    | ((r2 & 0x00f00000ul) << 4)
                    | ((r2 & 0xf0000000ul)));
#else
            register unsigned int const v =
                  ((r2 & 0x000000f0ul) >> 4)
                  | ((r2 & 0x0000f000ul) >> 8)
                  | ((r2 & 0x00f00000ul) >> 12)
                  | ((r2 & 0xf0000000ul) >> 16);
            *(ptr1++) = v |
                  ( ((r1 & 0x000000f0ul) << 12)
                    | ((r1 & 0x0000f000ul) << 8)
                    | ((r1 & 0x00f00000ul) << 4)
                    | ((r1 & 0xf0000000ul)));
#endif
            //} else ptr1++;
      } while (--i);
      TEST();

      SDL_UnlockSurface(surface);
      SDL_UpdateRect(surface, 0, 0, 0, 0);
      TEST();

}

SDLView::~SDLView()
{
      ::close(mFd);
}



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