sdl_dibvideo.c

MPEG-4编解码的实现(包括MPEG4视音频编解码)

				Rmask = 0x00ff0000;
				Gmask = 0x0000ff00;
				Bmask = 0x000000ff;
				break;
			default:
				Rmask = 0x00000000;
				Gmask = 0x00000000;
				Bmask = 0x00000000;
				break;
		}
		video = SDL_CreateRGBSurface(SDL_SWSURFACE,
					0, 0, bpp, Rmask, Gmask, Bmask, 0);
		if ( video == NULL ) {
			SDL_OutOfMemory();
			return(NULL);
		}
	}

	/* Fill in part of the video surface */
	prev_flags = video->flags;
	video->flags = 0;	/* Clear flags */
	video->w = width;
	video->h = height;
	video->pitch = SDL_CalculatePitch(video);

#ifndef NO_CHANGEDISPLAYSETTINGS
	/* Set fullscreen mode if appropriate */
	if ( (flags & SDL_FULLSCREEN) == SDL_FULLSCREEN ) {
		DEVMODE settings;

		memset(&settings, 0, sizeof(DEVMODE));
		settings.dmSize = sizeof(DEVMODE);
		settings.dmBitsPerPel = video->format->BitsPerPixel;
		settings.dmPelsWidth = width;
		settings.dmPelsHeight = height;
		settings.dmFields = DM_PELSWIDTH | DM_PELSHEIGHT | DM_BITSPERPEL;
		if ( ChangeDisplaySettings(&settings, CDS_FULLSCREEN) == DISP_CHANGE_SUCCESSFUL ) {
			video->flags |= SDL_FULLSCREEN;
			SDL_fullscreen_mode = settings;
		}
	}
#endif /* !NO_CHANGEDISPLAYSETTINGS */

	/* Reset the palette and create a new one if necessary */
	if ( screen_pal != NULL ) {
	/*	RJR: March 28, 2000
		delete identity palette if switching from a palettized mode */
		DeleteObject(screen_pal);
		screen_pal = NULL;
	}
	if ( bpp <= 8 )
	{
	/*	RJR: March 28, 2000
		create identity palette switching to a palettized mode */
		screen_pal = DIB_CreatePalette(bpp);
	}

	style = GetWindowLong(SDL_Window, GWL_STYLE);
#ifndef _WIN32_WCE
	style &= ~(resizestyle|WS_MAXIMIZE);
#endif
	if ( (video->flags & SDL_FULLSCREEN) == SDL_FULLSCREEN ) {
		style &= ~windowstyle;
		style |= directstyle;
	} else {
#ifndef NO_CHANGEDISPLAYSETTINGS
		if ( (prev_flags & SDL_FULLSCREEN) == SDL_FULLSCREEN ) {
			ChangeDisplaySettings(NULL, 0);
		}
#endif
		if ( flags & SDL_NOFRAME ) {
			style &= ~windowstyle;
			style |= directstyle;
			video->flags |= SDL_NOFRAME;
		} else {
			style &= ~directstyle;
			style |= windowstyle;
			if ( flags & SDL_RESIZABLE ) {
#ifndef _WIN32_WCE
				style |= resizestyle;
#endif
				video->flags |= SDL_RESIZABLE;
			}
		}
#ifndef _WIN32_WCE
		if (IsZoomed(SDL_Window)) style |= WS_MAXIMIZE;
#endif
	}

   /* DJM: Don't piss of anyone who has setup his own window */
   if (!SDL_windowid)
	   SetWindowLong(SDL_Window, GWL_STYLE, style);

	/* Delete the old bitmap if necessary */
	if ( screen_bmp != NULL ) {
		DeleteObject(screen_bmp);
	}
	if ( ! (flags & SDL_OPENGL) ) {
		BOOL is16bitmode = (video->format->BytesPerPixel == 2);

		/* Suss out the bitmap info header */
		binfo_size = sizeof(*binfo);
		if( is16bitmode ) {
			/* 16bit modes, palette area used for rgb bitmasks */
			binfo_size += 3*sizeof(DWORD);
		} else if ( video->format->palette ) {
			binfo_size += video->format->palette->ncolors *
							sizeof(RGBQUAD);
		}
		binfo = (BITMAPINFO *)malloc(binfo_size);
		if ( ! binfo ) {
			if ( video != current ) {
				SDL_FreeSurface(video);
			}
			SDL_OutOfMemory();
			return(NULL);
		}

		binfo->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
		binfo->bmiHeader.biWidth = video->w;
		binfo->bmiHeader.biHeight = -video->h;	/* -ve for topdown bitmap */
		binfo->bmiHeader.biPlanes = 1;
		binfo->bmiHeader.biSizeImage = video->h * video->pitch;
		binfo->bmiHeader.biXPelsPerMeter = 0;
		binfo->bmiHeader.biYPelsPerMeter = 0;
		binfo->bmiHeader.biClrUsed = 0;
		binfo->bmiHeader.biClrImportant = 0;
		binfo->bmiHeader.biBitCount = video->format->BitsPerPixel;

		if ( is16bitmode ) {
			/* BI_BITFIELDS tells CreateDIBSection about the rgb masks in the palette */
			binfo->bmiHeader.biCompression = BI_BITFIELDS;
			((Uint32*)binfo->bmiColors)[0] = video->format->Rmask;
			((Uint32*)binfo->bmiColors)[1] = video->format->Gmask;
			((Uint32*)binfo->bmiColors)[2] = video->format->Bmask;
		} else {
			binfo->bmiHeader.biCompression = BI_RGB;	/* BI_BITFIELDS for 565 vs 555 */
			if ( video->format->palette ) {
				memset(binfo->bmiColors, 0,
					video->format->palette->ncolors*sizeof(RGBQUAD));
			}
		}

		/* Create the offscreen bitmap buffer */
		hdc = GetDC(SDL_Window);
		screen_bmp = CreateDIBSection(hdc, binfo, DIB_RGB_COLORS,
					(void **)(&video->pixels), NULL, 0);
		ReleaseDC(SDL_Window, hdc);
		free(binfo);
		if ( screen_bmp == NULL ) {
			if ( video != current ) {
				SDL_FreeSurface(video);
			}
			SDL_SetError("Couldn't create DIB section");
			return(NULL);
		}
		this->UpdateRects = DIB_NormalUpdate;

		/* Set video surface flags */
		if ( bpp <= 8 ) {
			/* BitBlt() maps colors for us */
			video->flags |= SDL_HWPALETTE;
		}
	}

	/* Resize the window */
	if ( SDL_windowid == NULL ) {
		UINT swp_flags;

		SDL_resizing = 1;
		bounds.left = 0;
		bounds.top = 0;
		bounds.right = video->w;
		bounds.bottom = video->h;
#ifndef _WIN32_WCE
		AdjustWindowRect(&bounds, GetWindowLong(SDL_Window, GWL_STYLE), FALSE);
#else
		AdjustWindowRectEx(&bounds, GetWindowLong(SDL_Window, GWL_STYLE), FALSE,0);
#endif
		width = bounds.right-bounds.left;
		height = bounds.bottom-bounds.top;
		x = (GetSystemMetrics(SM_CXSCREEN)-width)/2;
		y = (GetSystemMetrics(SM_CYSCREEN)-height)/2;
		if ( y < 0 ) { /* Cover up title bar for more client area */
			y -= GetSystemMetrics(SM_CYCAPTION)/2;
		}
#ifndef _WIN32_WCE
		swp_flags = (SWP_NOCOPYBITS | SWP_NOZORDER | SWP_SHOWWINDOW);
#else
		swp_flags = (SWP_NOZORDER | SWP_SHOWWINDOW);
#endif
		if ( was_visible && !(flags & SDL_FULLSCREEN) ) {
			swp_flags |= SWP_NOMOVE;
		}
		SetWindowPos(SDL_Window, NULL, x, y, width, height, swp_flags);
		SDL_resizing = 0;
		SetForegroundWindow(SDL_Window);
	}

#ifdef HAVE_OPENGL
	/* Set up for OpenGL */
	if ( flags & SDL_OPENGL ) {
		if ( WIN_GL_SetupWindow(this) < 0 ) {
			return(NULL);
		}
		video->flags |= SDL_OPENGL;
	}
#endif /* HAVE_OPENGL */

	/* We're live! */
	return(video);
}

/* We don't actually allow hardware surfaces in the DIB driver */
static int DIB_AllocHWSurface(_THIS, SDL_Surface *surface)
{
	return(-1);
}
static void DIB_FreeHWSurface(_THIS, SDL_Surface *surface)
{
	return;
}
static int DIB_LockHWSurface(_THIS, SDL_Surface *surface)
{
	return(0);
}
static void DIB_UnlockHWSurface(_THIS, SDL_Surface *surface)
{
	return;
}

static void DIB_NormalUpdate(_THIS, int numrects, SDL_Rect *rects)
{
	HDC hdc, mdc;
	int i;

	hdc = GetDC(SDL_Window);
	if ( screen_pal ) {
		SelectPalette(hdc, screen_pal, FALSE);
	}
	mdc = CreateCompatibleDC(hdc);
	SelectObject(mdc, screen_bmp);
	for ( i=0; i<numrects; ++i ) {
		BitBlt(hdc, rects[i].x, rects[i].y, rects[i].w, rects[i].h,
					mdc, rects[i].x, rects[i].y, SRCCOPY);
	}
	DeleteDC(mdc);
	ReleaseDC(SDL_Window, hdc);
}

int DIB_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)
{
	RGBQUAD *pal;
	int i;
#ifndef _WIN32_WCE
	HDC hdc, mdc;
#else
	HDC hdc;
#endif

	/* Update the display palette */
	hdc = GetDC(SDL_Window);
	if ( screen_pal ) {
		PALETTEENTRY *entries;

		entries = (PALETTEENTRY *)alloca(ncolors*sizeof(PALETTEENTRY));
		for ( i=0; i<ncolors; ++i ) {
			entries[i].peRed   = colors[i].r;
			entries[i].peGreen = colors[i].g;
			entries[i].peBlue  = colors[i].b;
#ifndef _WIN32_WCE
			entries[i].peFlags = PC_NOCOLLAPSE;
#else
			entries[i].peFlags = 0;
#endif
		}
		SetPaletteEntries(screen_pal, firstcolor, ncolors, entries);
		SelectPalette(hdc, screen_pal, FALSE);
		RealizePalette(hdc);
	}

	/* Copy palette colors into DIB palette */
	pal = (RGBQUAD *)alloca(ncolors*sizeof(RGBQUAD));
	for ( i=0; i<ncolors; ++i ) {
		pal[i].rgbRed = colors[i].r;
		pal[i].rgbGreen = colors[i].g;
		pal[i].rgbBlue = colors[i].b;
		pal[i].rgbReserved = 0;
	}

	/* Set the DIB palette and update the display */
#ifndef _WIN32_WCE
	mdc = CreateCompatibleDC(hdc);
	SelectObject(mdc, screen_bmp);
	SetDIBColorTable(mdc, firstcolor, ncolors, pal);
	BitBlt(hdc, 0, 0, this->screen->w, this->screen->h,
	       mdc, 0, 0, SRCCOPY);
	DeleteDC(mdc);
#endif
	ReleaseDC(SDL_Window, hdc);
	return(1);
}

static void DIB_CheckGamma(_THIS)
{
#ifndef NO_GAMMA_SUPPORT
	HDC hdc;
	WORD ramp[3*256];

	/* If we fail to get gamma, disable gamma control */
	hdc = GetDC(SDL_Window);
	if ( ! GetDeviceGammaRamp(hdc, ramp) ) {
		this->GetGammaRamp = NULL;
		this->SetGammaRamp = NULL;
	}
	ReleaseDC(SDL_Window, hdc);
#endif /* !NO_GAMMA_SUPPORT */
}
void DIB_SwapGamma(_THIS)
{
#ifndef NO_GAMMA_SUPPORT
	HDC hdc;

	if ( gamma_saved ) {
		hdc = GetDC(SDL_Window);
		if ( SDL_GetAppState() & SDL_APPINPUTFOCUS ) {
			/* About to leave active state, restore gamma */
			SetDeviceGammaRamp(hdc, gamma_saved);
		} else {
			/* About to enter active state, set game gamma */
			GetDeviceGammaRamp(hdc, gamma_saved);
			SetDeviceGammaRamp(hdc, this->gamma);
		}
		ReleaseDC(SDL_Window, hdc);
	}
#endif /* !NO_GAMMA_SUPPORT */
}
void DIB_QuitGamma(_THIS)
{
#ifndef NO_GAMMA_SUPPORT
	if ( gamma_saved ) {
		/* Restore the original gamma if necessary */
		if ( SDL_GetAppState() & SDL_APPINPUTFOCUS ) {
			HDC hdc;

			hdc = GetDC(SDL_Window);
			SetDeviceGammaRamp(hdc, gamma_saved);
			ReleaseDC(SDL_Window, hdc);
		}

		/* Free the saved gamma memory */
		free(gamma_saved);
		gamma_saved = 0;
	}
#endif /* !NO_GAMMA_SUPPORT */
}

int DIB_SetGammaRamp(_THIS, Uint16 *ramp)
{
#ifdef NO_GAMMA_SUPPORT
	SDL_SetError("SDL compiled without gamma ramp support");
	return -1;
#else
	HDC hdc;
	BOOL succeeded;

	/* Set the ramp for the display */
	if ( ! gamma_saved ) {
		gamma_saved = (WORD *)malloc(3*256*sizeof(*gamma_saved));
		if ( ! gamma_saved ) {
			SDL_OutOfMemory();
			return -1;
		}
		hdc = GetDC(SDL_Window);
		GetDeviceGammaRamp(hdc, gamma_saved);
		ReleaseDC(SDL_Window, hdc);
	}
	if ( SDL_GetAppState() & SDL_APPINPUTFOCUS ) {
		hdc = GetDC(SDL_Window);
		succeeded = SetDeviceGammaRamp(hdc, ramp);
		ReleaseDC(SDL_Window, hdc);
	} else {
		succeeded = TRUE;
	}
	return succeeded ? 0 : -1;
#endif /* !NO_GAMMA_SUPPORT */
}

int DIB_GetGammaRamp(_THIS, Uint16 *ramp)
{
#ifdef NO_GAMMA_SUPPORT
	SDL_SetError("SDL compiled without gamma ramp support");
	return -1;
#else
	HDC hdc;
	BOOL succeeded;

	/* Get the ramp from the display */
	hdc = GetDC(SDL_Window);
	succeeded = GetDeviceGammaRamp(hdc, ramp);
	ReleaseDC(SDL_Window, hdc);
	return succeeded ? 0 : -1;
#endif /* !NO_GAMMA_SUPPORT */
}

void DIB_VideoQuit(_THIS)
{
	/* Destroy the window and everything associated with it */
	if ( SDL_Window ) {
		/* Delete the screen bitmap (also frees screen->pixels) */
		if ( this->screen ) {
#ifndef NO_CHANGEDISPLAYSETTINGS
			if ( this->screen->flags & SDL_FULLSCREEN ) {
				ChangeDisplaySettings(NULL, 0);
			}
#endif
#ifdef HAVE_OPENGL
			if ( this->screen->flags & SDL_OPENGL ) {
				WIN_GL_ShutDown(this);
			}
#endif /* HAVE_OPENGL */
			this->screen->pixels = NULL;
		}
		if ( screen_bmp ) {
			DeleteObject(screen_bmp);
			screen_bmp = NULL;
		}
		if ( screen_icn ) {
			DestroyIcon(screen_icn);
			screen_icn = NULL;
		}
		DIB_QuitGamma(this);
		DIB_DestroyWindow(this);

		SDL_Window = NULL;
	}
}

/* Exported for the windows message loop only */
static void DIB_FocusPalette(_THIS, int foreground)
{
	if ( screen_pal != NULL ) {
		HDC hdc;

		hdc = GetDC(SDL_Window);
		SelectPalette(hdc, screen_pal, FALSE);
		if ( RealizePalette(hdc) )
			InvalidateRect(SDL_Window, NULL, FALSE);
		ReleaseDC(SDL_Window, hdc);
	}
}
static void DIB_RealizePalette(_THIS)
{
	DIB_FocusPalette(this, 1);
}
static void DIB_PaletteChanged(_THIS, HWND window)
{
	if ( window != SDL_Window ) {
		DIB_FocusPalette(this, 0);
	}
}

/* Exported for the windows message loop only */
static void DIB_WinPAINT(_THIS, HDC hdc)
{
	HDC mdc;

	if ( screen_pal ) {
		SelectPalette(hdc, screen_pal, FALSE);
	}
	mdc = CreateCompatibleDC(hdc);
	SelectObject(mdc, screen_bmp);
	BitBlt(hdc, 0, 0, SDL_VideoSurface->w, SDL_VideoSurface->h,
							mdc, 0, 0, SRCCOPY);
	DeleteDC(mdc);
}

/* Stub in case DirectX isn't available */
#ifndef ENABLE_DIRECTX
void DX5_SoundFocus(HWND hwnd)
{
	return;
}
#endif