sdl_directfb_video.c

Simple DirectMedia Layer - Simple DirectMedia Layer 是一个跨平台的多媒体库设计用来提供快速图形framebuffer和音频驱动。应用MPEG为软件

/*
	SDL - Simple DirectMedia Layer
	Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga

	This library is free software; you can redistribute it and/or
	modify it under the terms of the GNU Library General Public
	License as published by the Free Software Foundation; either
	version 2 of the License, or (at your option) any later version.

	This library is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
	Library General Public License for more details.

	You should have received a copy of the GNU Library General Public
	License along with this library; if not, write to the Free
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

	Sam Lantinga
	[e-mail]
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id: SDL_DirectFB_video.c,v 1.9 2002/08/31 04:13:28 slouken Exp $";
#endif

/* DirectFB video driver implementation.
*/

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>

#include <directfb.h>

#include "SDL.h"
#include "SDL_error.h"
#include "SDL_video.h"
#include "SDL_mouse.h"
#include "SDL_sysvideo.h"
#include "SDL_pixels_c.h"
#include "SDL_events_c.h"
#include "SDL_DirectFB_video.h"
#include "SDL_DirectFB_events.h"
#include "SDL_DirectFB_yuv.h"


/* Initialization/Query functions */
static int DirectFB_VideoInit(_THIS, SDL_PixelFormat *vformat);
static SDL_Rect **DirectFB_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags);
static SDL_Surface *DirectFB_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);
static int DirectFB_SetColors(_THIS, int firstcolor, int ncolors,
			 SDL_Color *colors);
static void DirectFB_VideoQuit(_THIS);

/* Hardware surface functions */
static int DirectFB_AllocHWSurface(_THIS, SDL_Surface *surface);
static int DirectFB_FillHWRect(_THIS, SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color);
static int DirectFB_LockHWSurface(_THIS, SDL_Surface *surface);
static void DirectFB_UnlockHWSurface(_THIS, SDL_Surface *surface);
static void DirectFB_FreeHWSurface(_THIS, SDL_Surface *surface);
static int DirectFB_CheckHWBlit(_THIS, SDL_Surface *src, SDL_Surface *dst);
static int DirectFB_HWAccelBlit(SDL_Surface *src, SDL_Rect *srcrect,
                                SDL_Surface *dst, SDL_Rect *dstrect);
static int DirectFB_SetHWColorKey(_THIS, SDL_Surface *surface, Uint32 key);
static int DirectFB_SetHWAlpha(_THIS, SDL_Surface *surface, Uint8 alpha);
static int DirectFB_FlipHWSurface(_THIS, SDL_Surface *surface);

/* Various screen update functions available */
static void DirectFB_DirectUpdate(_THIS, int numrects, SDL_Rect *rects);
static void DirectFB_WindowedUpdate(_THIS, int numrects, SDL_Rect *rects);

/* This is the rect EnumModes2 uses */
struct DirectFBEnumRect {
	SDL_Rect r;
	struct DirectFBEnumRect* next;
};

static struct DirectFBEnumRect *enumlist = NULL;


/* DirectFB driver bootstrap functions */

static int DirectFB_Available(void)
{
  return 1;
}

static void DirectFB_DeleteDevice(SDL_VideoDevice *device)
{
  free(device->hidden);
  free(device);
}

static SDL_VideoDevice *DirectFB_CreateDevice(int devindex)
{
  SDL_VideoDevice *device;

  /* Initialize all variables that we clean on shutdown */
  device = (SDL_VideoDevice *)malloc(sizeof(SDL_VideoDevice));
  if (device)
    {
      memset (device, 0, (sizeof *device));
      device->hidden = (struct SDL_PrivateVideoData *) malloc (sizeof (*device->hidden));
    }
  if (device == NULL  ||  device->hidden == NULL)
    {
      SDL_OutOfMemory();
      if (device)
        {
          free (device);
        }
      return(0);
    }
  memset (device->hidden, 0, sizeof (*device->hidden));

  /* Set the function pointers */
  device->VideoInit = DirectFB_VideoInit;
  device->ListModes = DirectFB_ListModes;
  device->SetVideoMode = DirectFB_SetVideoMode;
  device->SetColors = DirectFB_SetColors;
  device->UpdateRects = NULL;
  device->CreateYUVOverlay = DirectFB_CreateYUVOverlay;
  device->VideoQuit = DirectFB_VideoQuit;
  device->AllocHWSurface = DirectFB_AllocHWSurface;
  device->CheckHWBlit = DirectFB_CheckHWBlit;
  device->FillHWRect = DirectFB_FillHWRect;
  device->SetHWColorKey = DirectFB_SetHWColorKey;
  device->SetHWAlpha = DirectFB_SetHWAlpha;
  device->LockHWSurface = DirectFB_LockHWSurface;
  device->UnlockHWSurface = DirectFB_UnlockHWSurface;
  device->FlipHWSurface = DirectFB_FlipHWSurface;
  device->FreeHWSurface = DirectFB_FreeHWSurface;
  device->SetCaption = NULL;
  device->SetIcon = NULL;
  device->IconifyWindow = NULL;
  device->GrabInput = NULL;
  device->GetWMInfo = NULL;
  device->InitOSKeymap = DirectFB_InitOSKeymap;
  device->PumpEvents = DirectFB_PumpEvents;

  device->free = DirectFB_DeleteDevice;

  return device;
}

VideoBootStrap DirectFB_bootstrap = {
  "directfb", "DirectFB",
  DirectFB_Available, DirectFB_CreateDevice
};

static DFBSurfacePixelFormat GetFormatForBpp (int bpp, IDirectFBDisplayLayer *layer)
{
  DFBDisplayLayerConfig dlc;
  int                   bytes = (bpp + 7) / 8;

  layer->GetConfiguration (layer, &dlc);

  if (bytes == DFB_BYTES_PER_PIXEL(dlc.pixelformat) && bytes > 1)
    return dlc.pixelformat;

  switch (bytes)
    {
    case 1:
      return DSPF_LUT8;
    case 2:
      return DSPF_RGB16;
    case 3:
      return DSPF_RGB24;
    case 4:
      return DSPF_RGB32;
    }

  return DSPF_UNKNOWN;
}

static DFBEnumerationResult EnumModesCallback (unsigned int  width,
                                               unsigned int  height,
                                               unsigned int  bpp,
                                               void         *data)
{
  SDL_VideoDevice *this = (SDL_VideoDevice *)data;
  struct DirectFBEnumRect *enumrect;

  HIDDEN->nummodes++;

  enumrect = calloc(1, sizeof(struct DirectFBEnumRect));
  if (!enumrect)
    {
      SDL_OutOfMemory();
      return DFENUM_CANCEL;
    }

  enumrect->r.w  = width;
  enumrect->r.h  = height;
  enumrect->next = enumlist;

  enumlist = enumrect;

  return DFENUM_OK;
}

struct private_hwdata {
  IDirectFBSurface *surface;
  IDirectFBPalette *palette;
};

void SetDirectFBerror (const char *function, DFBResult code)
{
  const char *error = DirectFBErrorString (code);

  if (error)
    SDL_SetError("%s: %s", function, error);
  else
    SDL_SetError("Unknown error code from %s", function);
}

static DFBSurfacePixelFormat SDLToDFBPixelFormat (SDL_PixelFormat *format)
{
  if (format->Rmask && format->Gmask && format->Bmask)
    {
      switch (format->BitsPerPixel)
        {
        case 8:
          return DSPF_LUT8;
          
        case 16:
          if (format->Rmask == 0xF800 &&
              format->Gmask == 0x07E0 &&
              format->Bmask == 0x001F)
            return DSPF_RGB16;
          /* fall through */
          
        case 15:
          if (format->Rmask == 0x7C00 &&
              format->Gmask == 0x03E0 &&
              format->Bmask == 0x001F)
            return DSPF_RGB15;
          break;
          
        case 24:
          if (format->Rmask == 0xFF0000 &&
              format->Gmask == 0x00FF00 &&
              format->Bmask == 0x0000FF)
            return DSPF_RGB24;
          break;

        case 32:
          if (format->Rmask == 0xFF0000 &&
              format->Gmask == 0x00FF00 &&
              format->Bmask == 0x0000FF)
            {
              if (format->Amask == 0xFF000000)
                return DSPF_ARGB;
              else
                return DSPF_RGB32;
            }
          break;
        }
    }
  else
    {
      switch (format->BitsPerPixel)
	{
        case 8:
          return DSPF_LUT8;
	case 15:
	  return DSPF_RGB15;
	case 16:
	  return DSPF_RGB16;
	case 24:
	  return DSPF_RGB24;
	case 32:
	  return DSPF_RGB32;
	}
    }

  return DSPF_UNKNOWN;
}

static SDL_Palette *AllocatePalette(int size)
{
  SDL_Palette *palette;
  SDL_Color   *colors;

  palette = calloc (1, sizeof(SDL_Palette));
  if (!palette)
    {
      SDL_OutOfMemory();
      return NULL;
    }

  colors = calloc (size, sizeof(SDL_Color));
  if (!colors)
    {
      SDL_OutOfMemory();
      return NULL;
    }

  palette->ncolors = size;
  palette->colors  = colors;

  return palette;
}

static int DFBToSDLPixelFormat (DFBSurfacePixelFormat pixelformat, SDL_PixelFormat *format)
{
  format->Amask = format->Rmask = format->Gmask = format->Bmask = 0;
  format->BitsPerPixel = format->BytesPerPixel = 0;

  switch (pixelformat)
    {
    case DSPF_A8:
      format->Amask = 0x000000FF;
      break;

    case DSPF_RGB15:
      format->Rmask = 0x00007C00;
      format->Gmask = 0x000003E0;
      format->Bmask = 0x0000001F;
      break;

    case DSPF_RGB16:
      format->Rmask = 0x0000F800;
      format->Gmask = 0x000007E0;
      format->Bmask = 0x0000001F;
      break;

    case DSPF_ARGB:
      format->Amask = 0; /* apps don't seem to like that:  0xFF000000; */
      /* fall through */
    case DSPF_RGB24:
    case DSPF_RGB32:
      format->Rmask = 0x00FF0000;
      format->Gmask = 0x0000FF00;
      format->Bmask = 0x000000FF;
      break;

    case DSPF_LUT8:
      format->Rmask = 0x000000FF;
      format->Gmask = 0x000000FF;
      format->Bmask = 0x000000FF;

      if (!format->palette)
        format->palette = AllocatePalette(256);
      break;

    default:
      fprintf (stderr, "SDL_DirectFB: Unsupported pixelformat (0x%08x)!\n", pixelformat);
      return -1;
    }

  format->BitsPerPixel  = DFB_BYTES_PER_PIXEL(pixelformat) * 8;
  format->BytesPerPixel = DFB_BYTES_PER_PIXEL(pixelformat);

  return 0;
}


int DirectFB_VideoInit(_THIS, SDL_PixelFormat *vformat)
{
  int                      i;
  DFBResult                ret;
  DFBCardCapabilities      caps;
  DFBDisplayLayerConfig    dlc;
  struct DirectFBEnumRect *rect;
  IDirectFB               *dfb    = NULL;
  IDirectFBDisplayLayer   *layer  = NULL;
  IDirectFBEventBuffer    *events = NULL;


  ret = DirectFBInit (NULL, NULL);
  if (ret)
    {
      SetDirectFBerror ("DirectFBInit", ret);
      goto error;
    }

  ret = DirectFBCreate (&dfb);
  if (ret)
    {
      SetDirectFBerror ("DirectFBCreate", ret);
      goto error;
    }

  ret = dfb->GetDisplayLayer (dfb, DLID_PRIMARY, &layer);
  if (ret)
    {
      SetDirectFBerror ("dfb->GetDisplayLayer", ret);
      goto error;
    }

  ret = dfb->CreateEventBuffer (dfb, DICAPS_ALL, &events);
  if (ret)
    {
      SetDirectFBerror ("dfb->CreateEventBuffer", ret);
      goto error;
    }
  
  layer->EnableCursor (layer, 1);

  /* Query layer configuration to determine the current mode and pixelformat */
  layer->GetConfiguration (layer, &dlc);

  /* If current format is not supported use LUT8 as the default */
  if (DFBToSDLPixelFormat (dlc.pixelformat, vformat))
    DFBToSDLPixelFormat (DSPF_LUT8, vformat);

  /* Enumerate the available fullscreen modes */
  ret = dfb->EnumVideoModes (dfb, EnumModesCallback, this);
  if (ret)
    {
      SetDirectFBerror ("dfb->EnumVideoModes", ret);
      goto error;
    }

  HIDDEN->modelist = calloc (HIDDEN->nummodes + 1, sizeof(SDL_Rect *));
  if (!HIDDEN->modelist)
    {
      SDL_OutOfMemory();
      goto error;
    }

  for (i = 0, rect = enumlist; rect; ++i, rect = rect->next )
    {
      HIDDEN->modelist[i] = &rect->r;
    }

  HIDDEN->modelist[i] = NULL;


  /* Query card capabilities to get the video memory size */
  dfb->GetCardCapabilities (dfb, &caps);

  this->info.wm_available = 1;
  this->info.hw_available = 1;
  this->info.blit_hw      = 1;
  this->info.blit_hw_CC   = 1;
  this->info.blit_hw_A    = 1;
  this->info.blit_fill    = 1;
  this->info.video_mem    = caps.video_memory / 1024;

  HIDDEN->initialized = 1;
  HIDDEN->dfb         = dfb;
  HIDDEN->layer       = layer;
  HIDDEN->eventbuffer = events;