/* display.c, X11 接口文件                                                */#ifdef DISPLAY#include <stdio.h>#include <stdlib.h>#include <X11/Xlib.h>#include <X11/Xutil.h>#include "config.h"#include "global.h"/* private prototypes */static void Display_Image _ANSI_ARGS_((XImage *Ximage_Ptr, unsigned char *Dithered_Image));static void Dither_Frame _ANSI_ARGS_((unsigned char *src[]));static void Dither_Top_Field _ANSI_ARGS_((unsigned char *src[], unsigned char *dst));static void Dither_Bottom_Field _ANSI_ARGS_((unsigned char *src[], unsigned char *dst));static void Dither_Top_Field420 _ANSI_ARGS_((unsigned char *src[],                                      unsigned char *dst));static void Dither_Bottom_Field420 _ANSI_ARGS_((unsigned char *src[],                                      unsigned char *dst));/* local data */static unsigned char *Dithered_Image, *Dithered_Image2;static unsigned char Y_Table[256+16];static unsigned char Cb_Table[128+16];static unsigned char Cr_Table[128+16];/* X11 related variables */static Display *Display_Ptr;static Window Window_Instance;static GC GC_Instance;static XImage *Ximage_Ptr, *Ximage_Ptr2;static unsigned char Pixel[256];#ifdef SH_MEM#include <sys/ipc.h>#include <sys/shm.h>#include <X11/extensions/XShm.h>static int HandleXError _ANSI_ARGS_((Display *dpy, XErrorEvent *event));static void InstallXErrorHandler _ANSI_ARGS_((void));static void DeInstallXErrorHandler _ANSI_ARGS_((void));static int Shmem_Flag;static XShmSegmentInfo Shminfo1, Shminfo2;static int gXErrorFlag;static int CompletionType = -1;static int HandleXError(Dpy, Event)Display *Dpy;XErrorEvent *Event;{  gXErrorFlag = 1;  return 0;}static void InstallXErrorHandler(){  XSetErrorHandler(HandleXError);  XFlush(Display_Ptr);}static void DeInstallXErrorHandler(){  XSetErrorHandler(NULL);  XFlush(Display_Ptr);}#endif/* connect to server, create and map window, * allocate colors and (shared) memory */void Initialize_Display_Process(name)char *name;{  int crv, cbu, cgu, cgv;  int Y, Cb, Cr, R, G, B;  int i;  char dummy;  int screen;  Colormap cmap;  int private;  XColor xcolor;  unsigned int fg, bg;  char *hello = "MPEG-2 Display";  XSizeHints hint;  XVisualInfo vinfo;  XEvent xev;  unsigned long tmp_pixel;  XWindowAttributes xwa;  Display_Ptr = XOpenDisplay(name);  if (Display_Ptr == NULL)    Error("Can not open display\n");  screen = DefaultScreen(Display_Ptr);  hint.x = 200;  hint.y = 200;  hint.width = horizontal_size;  hint.height = vertical_size;  hint.flags = PPosition | PSize;  /* Get some colors */  bg = WhitePixel (Display_Ptr, screen);  fg = BlackPixel (Display_Ptr, screen);  /* Make the window */  if (!XMatchVisualInfo(Display_Ptr, screen, 8, PseudoColor, &vinfo))  {    if (!XMatchVisualInfo(Display_Ptr, screen, 8, GrayScale, &vinfo))      Error("requires 8 bit display\n");  }  Window_Instance = XCreateSimpleWindow (Display_Ptr, DefaultRootWindow (Display_Ptr),             hint.x, hint.y, hint.width, hint.height, 4, fg, bg);  XSelectInput(Display_Ptr, Window_Instance, StructureNotifyMask);  /* Tell other applications about this window */  XSetStandardProperties (Display_Ptr, Window_Instance, hello, hello, None, NULL, 0, &hint);  /* Map window. */  XMapWindow(Display_Ptr, Window_Instance);  /* Wait for map. */  do  {    XNextEvent(Display_Ptr, &xev);  }  while (xev.type != MapNotify || xev.xmap.event != Window_Instance);  XSelectInput(Display_Ptr, Window_Instance, NoEventMask);  /* matrix coefficients */  crv = Inverse_Table_6_9[matrix_coefficients][0];  cbu = Inverse_Table_6_9[matrix_coefficients][1];  cgu = Inverse_Table_6_9[matrix_coefficients][2];  cgv = Inverse_Table_6_9[matrix_coefficients][3];  /* allocate colors */  GC_Instance = DefaultGC(Display_Ptr, screen);  cmap = DefaultColormap(Display_Ptr, screen);  private = 0;  /* color allocation:   * i is the (internal) 8 bit color number, it consists of separate   * bit fields for Y, U and V: i = (yyyyuuvv), we don't use yyyy=0000   * and yyyy=1111, this leaves 32 colors for other applications   *   * the allocated colors correspond to the following Y, U and V values:   * Y:   24, 40, 56, 72, 88, 104, 120, 136, 152, 168, 184, 200, 216, 232   * U,V: -48, -16, 16, 48   *   * U and V values span only about half the color space; this gives   * usually much better quality, although highly saturated colors can   * not be displayed properly   *   * translation to R,G,B is implicitly done by the color look-up table   */  for (i=16; i<240; i++)  {    /* color space conversion */    Y  = 16*((i>>4)&15) + 8;    Cb = 32*((i>>2)&3)  - 48;    Cr = 32*(i&3)       - 48;    Y = 76309 * (Y - 16); /* (255/219)*65536 */    R = Clip[(Y + crv*Cr + 32768)>>16];    G = Clip[(Y - cgu*Cb - cgv*Cr + 32768)>>16];    B = Clip[(Y + cbu*Cb + 32786)>>16];    /* X11 colors are 16 bit */    xcolor.red   = R << 8;    xcolor.green = G << 8;    xcolor.blue  = B << 8;    if (XAllocColor(Display_Ptr, cmap, &xcolor) != 0)      Pixel[i] = xcolor.pixel;    else    {      /* allocation failed, have to use a private colormap */      if (private)        Error("Couldn't allocate private colormap");      private = 1;      if (!Quiet_Flag)        fprintf(stderr, "Using private colormap (%d colors were available).\n",          i-16);      /* Free colors. */      while (--i >= 16)      {        tmp_pixel = Pixel[i]; /* because XFreeColors expects unsigned long */        XFreeColors(Display_Ptr, cmap, &tmp_pixel, 1, 0);      }      /* i is now 15, this restarts the outer loop */      /* create private colormap */      XGetWindowAttributes(Display_Ptr, Window_Instance, &xwa);      cmap = XCreateColormap(Display_Ptr, Window_Instance, xwa.visual, AllocNone);      XSetWindowColormap(Display_Ptr, Window_Instance, cmap);    }  }#ifdef SH_MEM  if (XShmQueryExtension(Display_Ptr))    Shmem_Flag = 1;  else  {    Shmem_Flag = 0;    if (!Quiet_Flag)      fprintf(stderr, "Shared memory not supported\nReverting to normal Xlib\n");  }  if (Shmem_Flag)    CompletionType = XShmGetEventBase(Display_Ptr) + ShmCompletion;  InstallXErrorHandler();  if (Shmem_Flag)  {    Ximage_Ptr = XShmCreateImage(Display_Ptr, None, 8, ZPixmap, NULL,                             &Shminfo1,                             Coded_Picture_Width, Coded_Picture_Height);    if (!progressive_sequence)      Ximage_Ptr2 = XShmCreateImage(Display_Ptr, None, 8, ZPixmap, NULL,                                &Shminfo2,                                Coded_Picture_Width, Coded_Picture_Height);    /* If no go, then revert to normal Xlib calls. */    if (Ximage_Ptr==NULL || (!progressive_sequence && Ximage_Ptr2==NULL))    {      if (Ximage_Ptr!=NULL)        XDestroyImage(Ximage_Ptr);      if (!progressive_sequence && Ximage_Ptr2!=NULL)        XDestroyImage(Ximage_Ptr2);      if (!Quiet_Flag)        fprintf(stderr, "Shared memory error, disabling (Ximage error)\n");      goto shmemerror;    }    /* Success here, continue. */    Shminfo1.shmid = shmget(IPC_PRIVATE,                             Ximage_Ptr->bytes_per_line * Ximage_Ptr->height,                            IPC_CREAT | 0777);    if (!progressive_sequence)      Shminfo2.shmid = shmget(IPC_PRIVATE,                               Ximage_Ptr2->bytes_per_line * Ximage_Ptr2->height,                              IPC_CREAT | 0777);    if (Shminfo1.shmid<0 || (!progressive_sequence && Shminfo2.shmid<0))    {      XDestroyImage(Ximage_Ptr);      if (!progressive_sequence)        XDestroyImage(Ximage_Ptr2);      if (!Quiet_Flag)        fprintf(stderr, "Shared memory error, disabling (seg id error)\n");      goto shmemerror;    }    Shminfo1.shmaddr = (char *) shmat(Shminfo1.shmid, 0, 0);    Shminfo2.shmaddr = (char *) shmat(Shminfo2.shmid, 0, 0);    if (Shminfo1.shmaddr==((char *) -1) ||        (!progressive_sequence && Shminfo2.shmaddr==((char *) -1)))    {      XDestroyImage(Ximage_Ptr);      if (Shminfo1.shmaddr!=((char *) -1))        shmdt(Shminfo1.shmaddr);      if (!progressive_sequence)      {        XDestroyImage(Ximage_Ptr2);        if (Shminfo2.shmaddr!=((char *) -1))          shmdt(Shminfo2.shmaddr);      }      if (!Quiet_Flag)      {        fprintf(stderr, "Shared memory error, disabling (address error)\n");      }      goto shmemerror;    }    Ximage_Ptr->data = Shminfo1.shmaddr;    Dithered_Image = (unsigned char *)Ximage_Ptr->data;    Shminfo1.readOnly = False;    XShmAttach(Display_Ptr, &Shminfo1);    if (!progressive_sequence)    {      Ximage_Ptr2->data = Shminfo2.shmaddr;      Dithered_Image2 = (unsigned char *)Ximage_Ptr2->data;      Shminfo2.readOnly = False;      XShmAttach(Display_Ptr, &Shminfo2);    }    XSync(Display_Ptr, False);    if (gXErrorFlag)    {      /* Ultimate failure here. */      XDestroyImage(Ximage_Ptr);      shmdt(Shminfo1.shmaddr);      if (!progressive_sequence)      {        XDestroyImage(Ximage_Ptr2);        shmdt(Shminfo2.shmaddr);      }      if (!Quiet_Flag)        fprintf(stderr, "Shared memory error, disabling.\n");      gXErrorFlag = 0;      goto shmemerror;    }    else    {      shmctl(Shminfo1.shmid, IPC_RMID, 0);      if (!progressive_sequence)        shmctl(Shminfo2.shmid, IPC_RMID, 0);    }    if (!Quiet_Flag)    {      fprintf(stderr, "Sharing memory.\n");    }  }  else  {shmemerror:    Shmem_Flag = 0;#endif    Ximage_Ptr = XCreateImage(Display_Ptr,None,8,ZPixmap,0,&dummy,                          Coded_Picture_Width,Coded_Picture_Height,8,0);    if (!(Dithered_Image = (unsigned char *)malloc(Coded_Picture_Width*                                                   Coded_Picture_Height)))      Error("malloc failed");    if (!progressive_sequence)    {      Ximage_Ptr2 = XCreateImage(Display_Ptr,None,8,ZPixmap,0,&dummy,                             Coded_Picture_Width,Coded_Picture_Height,8,0);      if (!(Dithered_Image2 = (unsigned char *)malloc(Coded_Picture_Width*                                                      Coded_Picture_Height)))        Error("malloc failed");    }#ifdef SH_MEM  }  DeInstallXErrorHandler();#endif}void Terminate_Display_Process(){#ifdef SH_MEM  if (Shmem_Flag)  {    XShmDetach(Display_Ptr, &Shminfo1);    XDestroyImage(Ximage_Ptr);    shmdt(Shminfo1.shmaddr);    if (!progressive_sequence)    {      XShmDetach(Display_Ptr, &Shminfo2);      XDestroyImage(Ximage_Ptr2);      shmdt(Shminfo2.shmaddr);    }  }#endif}static void Display_Image(Ximage_Ptr,Dithered_Image)XImage *Ximage_Ptr;