sdl_dibvideo.c

MPEG-4编解码的实现(包括MPEG4视音频编解码)

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997, 1998, 1999  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_dibvideo.c,v 1.4 2002/04/22 21:38:05 wmay Exp $";
#endif

#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <windows.h>

/* Not yet in the mingw32 cross-compile headers */
#ifndef CDS_FULLSCREEN
#define CDS_FULLSCREEN	4
#endif

#include "SDL.h"
#include "SDL_mutex.h"
#include "SDL_syswm.h"
#include "SDL_sysvideo.h"
#include "SDL_sysevents.h"
#include "SDL_events_c.h"
#include "SDL_pixels_c.h"
#include "SDL_dibvideo.h"
#include "SDL_syswm_c.h"
#include "SDL_sysmouse_c.h"
#include "SDL_dibevents_c.h"
#include "SDL_wingl_c.h"

#ifdef _WIN32_WCE
#define NO_GETDIBITS
#define NO_CHANGEDISPLAYSETTINGS
#define NO_GAMMA_SUPPORT
#endif

/* Initialization/Query functions */
static int DIB_VideoInit(_THIS, SDL_PixelFormat *vformat);
static SDL_Rect **DIB_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags);
SDL_Surface *DIB_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);
static int DIB_SetColors(_THIS, int firstcolor, int ncolors,
			 SDL_Color *colors);
static void DIB_CheckGamma(_THIS);
void DIB_SwapGamma(_THIS);
void DIB_QuitGamma(_THIS);
int DIB_SetGammaRamp(_THIS, Uint16 *ramp);
int DIB_GetGammaRamp(_THIS, Uint16 *ramp);
static void DIB_VideoQuit(_THIS);

/* Hardware surface functions */
static int DIB_AllocHWSurface(_THIS, SDL_Surface *surface);
static int DIB_LockHWSurface(_THIS, SDL_Surface *surface);
static void DIB_UnlockHWSurface(_THIS, SDL_Surface *surface);
static void DIB_FreeHWSurface(_THIS, SDL_Surface *surface);

/* Windows message handling functions */
static void DIB_RealizePalette(_THIS);
static void DIB_PaletteChanged(_THIS, HWND window);
static void DIB_WinPAINT(_THIS, HDC hdc);

/* helper fn */
static int DIB_SussScreenDepth();

/* DIB driver bootstrap functions */

static int DIB_Available(void)
{
	return(1);
}

static void DIB_DeleteDevice(SDL_VideoDevice *device)
{
	if ( device ) {
		if ( device->hidden ) {
			free(device->hidden);
		}
		if ( device->gl_data ) {
			free(device->gl_data);
		}
		free(device);
	}
}

static SDL_VideoDevice *DIB_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));
		device->gl_data = (struct SDL_PrivateGLData *)
				malloc((sizeof *device->gl_data));
	}
	if ( (device == NULL) || (device->hidden == NULL) ||
		                 (device->gl_data == NULL) ) {
		SDL_OutOfMemory();
		DIB_DeleteDevice(device);
		return(NULL);
	}
	memset(device->hidden, 0, (sizeof *device->hidden));
	memset(device->gl_data, 0, (sizeof *device->gl_data));

	/* Set the function pointers */
	device->VideoInit = DIB_VideoInit;
	device->ListModes = DIB_ListModes;
	device->SetVideoMode = DIB_SetVideoMode;
	device->UpdateMouse = WIN_UpdateMouse;
	device->SetColors = DIB_SetColors;
	device->UpdateRects = NULL;
	device->VideoQuit = DIB_VideoQuit;
	device->AllocHWSurface = DIB_AllocHWSurface;
	device->CheckHWBlit = NULL;
	device->FillHWRect = NULL;
	device->SetHWColorKey = NULL;
	device->SetHWAlpha = NULL;
	device->LockHWSurface = DIB_LockHWSurface;
	device->UnlockHWSurface = DIB_UnlockHWSurface;
	device->FlipHWSurface = NULL;
	device->FreeHWSurface = DIB_FreeHWSurface;
	device->SetGammaRamp = DIB_SetGammaRamp;
	device->GetGammaRamp = DIB_GetGammaRamp;
#ifdef HAVE_OPENGL
        device->GL_LoadLibrary = WIN_GL_LoadLibrary;
        device->GL_GetProcAddress = WIN_GL_GetProcAddress;
        device->GL_GetAttribute = WIN_GL_GetAttribute;
        device->GL_MakeCurrent = WIN_GL_MakeCurrent;
        device->GL_SwapBuffers = WIN_GL_SwapBuffers;
#endif
	device->SetCaption = WIN_SetWMCaption;
	device->SetIcon = WIN_SetWMIcon;
	device->IconifyWindow = WIN_IconifyWindow;
	device->GrabInput = WIN_GrabInput;
	device->GetWMInfo = WIN_GetWMInfo;
	device->FreeWMCursor = WIN_FreeWMCursor;
	device->CreateWMCursor = WIN_CreateWMCursor;
	device->ShowWMCursor = WIN_ShowWMCursor;
	device->WarpWMCursor = WIN_WarpWMCursor;
	device->CheckMouseMode = WIN_CheckMouseMode;
	device->InitOSKeymap = DIB_InitOSKeymap;
	device->PumpEvents = DIB_PumpEvents;

	/* Set up the windows message handling functions */
	WIN_RealizePalette = DIB_RealizePalette;
	WIN_PaletteChanged = DIB_PaletteChanged;
	WIN_WinPAINT = DIB_WinPAINT;
	HandleMessage = DIB_HandleMessage;

	device->free = DIB_DeleteDevice;

	/* We're finally ready */
	return device;
}

VideoBootStrap WINDIB_bootstrap = {
	"windib", "Win95/98/NT/2000 GDI",
	DIB_Available, DIB_CreateDevice
};

#ifndef NO_CHANGEDISPLAYSETTINGS

static int cmpmodes(const void *va, const void *vb)
{
    SDL_Rect *a = *(SDL_Rect **)va;
    SDL_Rect *b = *(SDL_Rect **)vb;
    if(a->w > b->w)
        return -1;
    return b->h - a->h;
}

static int DIB_AddMode(_THIS, int bpp, int w, int h)
{
	SDL_Rect *mode;
	int i, index;
	int next_mode;

	/* Check to see if we already have this mode */
	if ( bpp < 8 ) {  /* Not supported */
		return(0);
	}
	index = ((bpp+7)/8)-1;
	for ( i=0; i<SDL_nummodes[index]; ++i ) {
		mode = SDL_modelist[index][i];
		if ( (mode->w == w) && (mode->h == h) ) {
			return(0);
		}
	}

	/* Set up the new video mode rectangle */
	mode = (SDL_Rect *)malloc(sizeof *mode);
	if ( mode == NULL ) {
		SDL_OutOfMemory();
		return(-1);
	}
	mode->x = 0;
	mode->y = 0;
	mode->w = w;
	mode->h = h;

	/* Allocate the new list of modes, and fill in the new mode */
	next_mode = SDL_nummodes[index];
	SDL_modelist[index] = (SDL_Rect **)
	       realloc(SDL_modelist[index], (1+next_mode+1)*sizeof(SDL_Rect *));
	if ( SDL_modelist[index] == NULL ) {
		SDL_OutOfMemory();
		SDL_nummodes[index] = 0;
		free(mode);
		return(-1);
	}
	SDL_modelist[index][next_mode] = mode;
	SDL_modelist[index][next_mode+1] = NULL;
	SDL_nummodes[index]++;

	return(0);
}

#endif /* !NO_CHANGEDISPLAYSETTINGS */

static HPALETTE DIB_CreatePalette(int bpp)
{
/*	RJR: March 28, 2000
	moved palette creation here from "DIB_VideoInit" */

	HPALETTE handle = NULL;
	
	if ( bpp <= 8 )
	{
		LOGPALETTE *palette;
		HDC hdc;
		int ncolors;
		int i;

		ncolors = 1;
		for ( i=0; i<bpp; ++i ) {
			ncolors *= 2;
		}
		palette = (LOGPALETTE *)malloc(sizeof(*palette)+
					ncolors*sizeof(PALETTEENTRY));
		palette->palVersion = 0x300;
		palette->palNumEntries = ncolors;
		hdc = GetDC(SDL_Window);
		GetSystemPaletteEntries(hdc, 0, ncolors, palette->palPalEntry);
		ReleaseDC(SDL_Window, hdc);
		handle = CreatePalette(palette);
		free(palette);
	}
	
	return handle;
}

int DIB_VideoInit(_THIS, SDL_PixelFormat *vformat)
{
#ifndef NO_CHANGEDISPLAYSETTINGS
	int i;
	DEVMODE settings;
#endif

	/* Create the window */
	if ( DIB_CreateWindow(this) < 0 ) {
		return(-1);
	}
#ifndef DISABLE_AUDIO
	DX5_SoundFocus(SDL_Window);
#endif

	/* Determine the screen depth */
	vformat->BitsPerPixel = DIB_SussScreenDepth();
	switch (vformat->BitsPerPixel) {
		case 15:
			vformat->Rmask = 0x00007c00;
			vformat->Gmask = 0x000003e0;
			vformat->Bmask = 0x0000001f;
			vformat->BitsPerPixel = 16;
			break;
		case 16:
			vformat->Rmask = 0x0000f800;
			vformat->Gmask = 0x000007e0;
			vformat->Bmask = 0x0000001f;
			break;
		case 24:
		case 32:
			/* GDI defined as 8-8-8 */
			vformat->Rmask = 0x00ff0000;
			vformat->Gmask = 0x0000ff00;
			vformat->Bmask = 0x000000ff;
			break;
		default:
			break;
	}

	/* See if gamma is supported on this screen */
	DIB_CheckGamma(this);

#ifndef NO_CHANGEDISPLAYSETTINGS
	/* Query for the list of available video modes */
	for ( i=0; EnumDisplaySettings(NULL, i, &settings); ++i ) {
		DIB_AddMode(this, settings.dmBitsPerPel,
			settings.dmPelsWidth, settings.dmPelsHeight);
	}
	/* Sort the mode lists */
	for ( i=0; i<NUM_MODELISTS; ++i ) {
		if ( SDL_nummodes[i] > 0 ) {
			qsort(SDL_modelist[i], SDL_nummodes[i], sizeof *SDL_modelist[i], cmpmodes);
		}
	}
#endif /* !NO_CHANGEDISPLAYSETTINGS */

	/* Grab an identity palette if we are in a palettized mode */
	if ( vformat->BitsPerPixel <= 8 ) {
	/*	RJR: March 28, 2000
		moved palette creation to "DIB_CreatePalette" */
		screen_pal = DIB_CreatePalette(vformat->BitsPerPixel);
	}

	/* Fill in some window manager capabilities */
	this->info.wm_available = 1;

	/* We're done! */
	return(0);
}

/* We support any format at any dimension */
SDL_Rect **DIB_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)
{
#ifdef NO_CHANGEDISPLAYSETTINGS
	return((SDL_Rect **)-1);
#else
	if ( (flags & SDL_FULLSCREEN) == SDL_FULLSCREEN ) {
		return(SDL_modelist[((format->BitsPerPixel+7)/8)-1]);
	} else {
		return((SDL_Rect **)-1);
	}
#endif
}


/*
  Helper fn to work out which screen depth windows is currently using.
  15 bit mode is considered 555 format, 16 bit is 565.
  returns 0 for unknown mode.
  (Derived from code in sept 1999 Windows Developer Journal
  http://www.wdj.com/code/archive.html)
*/
static int DIB_SussScreenDepth()
{
#ifdef NO_GETDIBITS
	int depth;
	HDC hdc;

	hdc = GetDC(SDL_Window);
	depth = GetDeviceCaps(hdc, PLANES) * GetDeviceCaps(hdc, BITSPIXEL);
	ReleaseDC(SDL_Window, hdc);
#ifndef _WIN32_WCE
	// AFAIK 16 bit CE devices have indeed RGB 565
	if ( depth == 16 ) {
		depth = 15;	/* GDI defined as RGB 555 */
	}
#endif
	return(depth);
#else
    int dib_size;
    LPBITMAPINFOHEADER dib_hdr;
    HDC hdc;
    HBITMAP hbm;

    /* Allocate enough space for a DIB header plus palette (for
     * 8-bit modes) or bitfields (for 16- and 32-bit modes)
     */
    dib_size = sizeof(BITMAPINFOHEADER) + 256 * sizeof (RGBQUAD);
    dib_hdr = (LPBITMAPINFOHEADER) malloc(dib_size);
    memset(dib_hdr, 0, dib_size);
    dib_hdr->biSize = sizeof(BITMAPINFOHEADER);
    
    /* Get a device-dependent bitmap that's compatible with the
       screen.
     */
    hdc = GetDC(NULL);
    hbm = CreateCompatibleBitmap( hdc, 1, 1 );

    /* Convert the DDB to a DIB.  We need to call GetDIBits twice:
     * the first call just fills in the BITMAPINFOHEADER; the 
     * second fills in the bitfields or palette.
     */
    GetDIBits(hdc, hbm, 0, 1, NULL, (LPBITMAPINFO) dib_hdr, DIB_RGB_COLORS);
    GetDIBits(hdc, hbm, 0, 1, NULL, (LPBITMAPINFO) dib_hdr, DIB_RGB_COLORS);
    DeleteObject(hbm);
    ReleaseDC(NULL, hdc);

    switch( dib_hdr->biBitCount )
    {
    case 8:     return 8;
    case 24:    return 24;
    case 32:    return 32;
    case 16:
        if( dib_hdr->biCompression == BI_BITFIELDS ) {
            /* check the red mask */
            switch( ((DWORD*)((char*)dib_hdr + dib_hdr->biSize))[0] ) {
                case 0xf800: return 16;    /* 565 */
                case 0x7c00: return 15;    /* 555 */
            }
        }
    }
    return 0;    /* poo. */
#endif /* NO_GETDIBITS */
}


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

SDL_Surface *DIB_SetVideoMode(_THIS, SDL_Surface *current,
				int width, int height, int bpp, Uint32 flags)
{
	SDL_Surface *video;
	Uint32 prev_flags;
	DWORD style;
	const DWORD directstyle =
			(WS_POPUP);
	const DWORD windowstyle = 
			(WS_OVERLAPPED|WS_CAPTION|WS_SYSMENU|WS_MINIMIZEBOX);
#ifndef _WIN32_WCE
	const DWORD resizestyle =
			(WS_THICKFRAME|WS_MAXIMIZEBOX);
#endif
	int binfo_size;
	BITMAPINFO *binfo;
	HDC hdc;
	RECT bounds;
	int x, y;
	BOOL was_visible;
	Uint32 Rmask, Gmask, Bmask;

	/* See whether or not we should center the window */
	was_visible = IsWindowVisible(SDL_Window);

#ifdef HAVE_OPENGL
	/* Clean up any GL context that may be hanging around */
	if ( current->flags & SDL_OPENGL ) {
		WIN_GL_ShutDown(this);
	}
#endif /* HAVE_OPENGL */

	/* Recalculate the bitmasks if necessary */
	if ( bpp == current->format->BitsPerPixel ) {
		video = current;
	} else {
		switch (bpp) {
			case 15:
			case 16:
				if ( DIB_SussScreenDepth() == 15 ) {
					/* 5-5-5 */
					Rmask = 0x00007c00;
					Gmask = 0x000003e0;
					Bmask = 0x0000001f;
				} else {
					/* 5-6-5 */
					Rmask = 0x0000f800;
					Gmask = 0x000007e0;
					Bmask = 0x0000001f;
				}
				break;
			case 24:
			case 32:
				/* GDI defined as 8-8-8 */