sdl_wsconsvideo.c

SDL库 在进行视频显示程序spcaview安装时必须的库文件

  if (private->shadowFB) {
    private->shadowmem = (Uint8 *)SDL_malloc(len);
    if (private->shadowmem == NULL) {
      WSCONS_ReportError("No memory for shadow");
      return -1;
    }
    private->fbstart = private->shadowmem;
    private->fblinebytes = width * ((private->info.depth + 7) / 8);
  } else { 
    private->fbstart = private->physmem;
    private->fblinebytes = private->physlinebytes;
  }
  
  private->SDL_modelist[0] = (SDL_Rect *)SDL_malloc(sizeof(SDL_Rect));
  private->SDL_modelist[0]->w = width;
  private->SDL_modelist[0]->h = height;

  vformat->BitsPerPixel = private->info.depth;
  vformat->BytesPerPixel = private->info.depth / 8;
  
  if (WSCONS_InitKeyboard(this) == -1) {
    return -1;
  }
  
  return 0;
}

SDL_Rect **WSCONS_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)
{
  if (format->BitsPerPixel == private->info.depth) {
    return private->SDL_modelist;
  } else {
    return NULL;
  }
}

SDL_Surface *WSCONS_SetVideoMode(_THIS, SDL_Surface *current,
				 int width, int height, int bpp, Uint32 flags)
{
  if (width != private->SDL_modelist[0]->w || 
      height != private->SDL_modelist[0]->h) {
    WSCONS_ReportError("Requested video mode %dx%d not supported.",
		       width, height);
    return NULL;
  }
  if (bpp != private->info.depth) {
    WSCONS_ReportError("Requested video depth %d bpp not supported.", bpp);
    return NULL;
  }

  if (!SDL_ReallocFormat(current, 
			 bpp, 
			 private->redMask,
			 private->greenMask,
			 private->blueMask,
			 0)) {
    WSCONS_ReportError("Couldn't allocate new pixel format");
    return NULL;
  }

  current->flags &= SDL_FULLSCREEN;
  if (private->shadowFB) {
    current->flags |= SDL_SWSURFACE;
  } else {
    current->flags |= SDL_HWSURFACE;
  }
  current->w = width;
  current->h = height;
  current->pitch = private->fblinebytes;
  current->pixels = private->fbstart;

  SDL_memset(private->fbstart, 0, private->fbmem_len);

  return current;
}

static int WSCONS_AllocHWSurface(_THIS, SDL_Surface *surface)
{
  return -1;
}
static void WSCONS_FreeHWSurface(_THIS, SDL_Surface *surface)
{
}

static int WSCONS_LockHWSurface(_THIS, SDL_Surface *surface)
{
  return 0;
}

static void WSCONS_UnlockHWSurface(_THIS, SDL_Surface *surface)
{
}

static void WSCONS_blit16(Uint8 *byte_src_pos,
			  int srcRightDelta, 
			  int srcDownDelta, 
			  Uint8 *byte_dst_pos,
			  int dst_linebytes,
			  int width,
			  int height)
{
  int w;
  Uint16 *src_pos = (Uint16 *)byte_src_pos;
  Uint16 *dst_pos = (Uint16 *)byte_dst_pos;

  while (height) {
    Uint16 *src = src_pos;
    Uint16 *dst = dst_pos;
    for (w = width; w != 0; w--) {
      *dst = *src;
      src += srcRightDelta;
      dst++;
    }
    dst_pos = (Uint16 *)((Uint8 *)dst_pos + dst_linebytes);
    src_pos += srcDownDelta;
    height--;
  }
}

#define BLOCKSIZE_W 32
#define BLOCKSIZE_H 32

static void WSCONS_blit16blocked(Uint8 *byte_src_pos,
				 int srcRightDelta, 
				 int srcDownDelta, 
				 Uint8 *byte_dst_pos,
				 int dst_linebytes,
				 int width,
				 int height)
{
  int w;
  Uint16 *src_pos = (Uint16 *)byte_src_pos;
  Uint16 *dst_pos = (Uint16 *)byte_dst_pos;

  while (height > 0) {
    Uint16 *src = src_pos;
    Uint16 *dst = dst_pos;
    for (w = width; w > 0; w -= BLOCKSIZE_W) {
      WSCONS_blit16((Uint8 *)src,
		    srcRightDelta,
		    srcDownDelta,
		    (Uint8 *)dst,
		    dst_linebytes,
		    min(w, BLOCKSIZE_W),
		    min(height, BLOCKSIZE_H));
      src += srcRightDelta * BLOCKSIZE_W;
      dst += BLOCKSIZE_W;
    }
    dst_pos = (Uint16 *)((Uint8 *)dst_pos + dst_linebytes * BLOCKSIZE_H);
    src_pos += srcDownDelta * BLOCKSIZE_H;
    height -= BLOCKSIZE_H;
  }
}

static void WSCONS_UpdateRects(_THIS, int numrects, SDL_Rect *rects)
{
  int width = private->SDL_modelist[0]->w;
  int height = private->SDL_modelist[0]->h;
  int bytesPerPixel = (private->info.depth + 7) / 8;
  int i;

  if (!private->shadowFB) {
    return;
  }

  if (private->info.depth != 16) {
    WSCONS_ReportError("Shadow copy only implemented for 16 bpp");
    return;
  }

  for (i = 0; i < numrects; i++) {
    int x1, y1, x2, y2;
    int scr_x1, scr_y1, scr_x2, scr_y2;
    int sha_x1, sha_y1;
    int shadowRightDelta;  /* Address change when moving right in dest */
    int shadowDownDelta;   /* Address change when moving down in dest */
    Uint8 *src_start;
    Uint8 *dst_start;

    x1 = rects[i].x; 
    y1 = rects[i].y;
    x2 = x1 + rects[i].w; 
    y2 = y1 + rects[i].h;

    if (x1 < 0) {
      x1 = 0;
    } else if (x1 > width) {
      x1 = width;
    }
    if (x2 < 0) {
      x2 = 0;
    } else if (x2 > width) {
      x2 = width;
    }
    if (y1 < 0) {
      y1 = 0;
    } else if (y1 > height) {
      y1 = height;
    }
    if (y2 < 0) {
      y2 = 0;
    } else if (y2 > height) {
      y2 = height;
    }
    if (x2 <= x1 || y2 <= y1) {
      continue;
    }

    switch (private->rotate) {
      case WSCONS_ROTATE_NONE:
	sha_x1 = scr_x1 = x1;
	sha_y1 = scr_y1 = y1;
	scr_x2 = x2;
	scr_y2 = y2;
	shadowRightDelta = 1;
	shadowDownDelta = width;
	break;
      case WSCONS_ROTATE_CCW:
	scr_x1 = y1;
	scr_y1 = width - x2;
	scr_x2 = y2;
	scr_y2 = width - x1;
	sha_x1 = x2 - 1;
	sha_y1 = y1;
	shadowRightDelta = width;
	shadowDownDelta = -1;
	break;
      case WSCONS_ROTATE_UD:
	scr_x1 = width - x2;
	scr_y1 = height - y2;
	scr_x2 = width - x1;
	scr_y2 = height - y1;
	sha_x1 = x2 - 1;
	sha_y1 = y2 - 1;
	shadowRightDelta = -1;
	shadowDownDelta = -width;
	break;
      case WSCONS_ROTATE_CW:
	scr_x1 = height - y2;
	scr_y1 = x1;
	scr_x2 = height - y1;
	scr_y2 = x2;
	sha_x1 = x1;
	sha_y1 = y2 - 1;
	shadowRightDelta = -width;
	shadowDownDelta = 1;
	break;
      default:
	WSCONS_ReportError("Unknown rotation");
	return;
    }

    src_start = private->shadowmem + (sha_y1 * width + sha_x1) * bytesPerPixel;
    dst_start = private->physmem + scr_y1 * private->physlinebytes + 
      scr_x1 * bytesPerPixel;

    private->blitFunc(src_start,
		      shadowRightDelta, 
		      shadowDownDelta, 
		      dst_start,
		      private->physlinebytes,
		      scr_x2 - scr_x1,
		      scr_y2 - scr_y1);
  }
}

int WSCONS_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)
{
  return 0;
}

/*
 * Note: If we are terminated, this could be called in the middle of
 * another SDL video routine -- notably UpdateRects.
 */
void WSCONS_VideoQuit(_THIS)
{
  int mode = WSDISPLAYIO_MODE_EMUL;

  if (private->shadowmem != NULL) {
    SDL_free(private->shadowmem);
    private->shadowmem = NULL;
  }
  private->fbstart = NULL;
  if (this->screen != NULL) {
    this->screen->pixels = NULL;
  }

  if (private->SDL_modelist[0] != NULL) {
    SDL_free(private->SDL_modelist[0]);
    private->SDL_modelist[0] = NULL;
  }

  if (ioctl(private->fd, WSDISPLAYIO_SMODE, &mode) == -1) {
    WSCONS_ReportError("ioctl SMODE");
  }

  WSCONS_ReleaseKeyboard(this);

  if (private->fd != -1) {
    close(private->fd);
    private->fd = -1;
  }
}