pnmshow24.c

pnmshow24 is like pnmshow, but it uses 3 bytes/pixel internally, which is not as efficient as 4 bytes/pixel for translation, because there is no native data type of that size, so you have to memcpy pixels and be real cautious with endianness.

pnmshow24 is like pnmshow, but it uses 3 bytes/pixel internally, which is not as efficient as 4 bytes/pixel for translation, because there is no native data type of that size, so you have to memcpy pixels and be real cautious with endianness. Anyway, it works.

 
#include <stdio.h>
#include <rfb/rfb.h>
#include <rfb/keysym.h>
 
#ifndef LIBVNCSERVER_ALLOW24BPP
int main() {
        printf("I need the ALLOW24BPP LibVNCServer flag to work\n");
        exit(1);
}
#else
 
static void HandleKey(rfbBool down,rfbKeySym key,rfbClientPtr cl)
{
  if(down && (key==XK_Escape || key=='q' || key=='Q'))
    rfbCloseClient(cl);
}
 
int main(int argc,char** argv)
{
  FILE* in=stdin;
  int j,width,height,paddedWidth;
  char buffer[1024];
  rfbScreenInfoPtr rfbScreen;
 
  if(argc>1) {
    in=fopen(argv[1],"rb");
    if(!in) {
      printf("Couldn't find file %s.\n",argv[1]);
      exit(1);
    }
  }
 
  fgets(buffer,1024,in);
  if(strncmp(buffer,"P6",2)) {
    printf("Not a ppm.\n");
    exit(2);
  }
 
  /* skip comments */
  do {
    fgets(buffer,1024,in);
  } while(buffer[0]=='#');
 
  /* get width & height */
  if(sscanf(buffer,"%d %d",&width,&height) != 2) {
    printf("Failed to get width or height.\n");
    exit(3);
  }
  rfbLog("Got width %d and height %d.\n",width,height);
  fgets(buffer,1024,in);
 
  /* vncviewers have problems with widths which are no multiple of 4. */
  paddedWidth = width;
 
  /* if your vncviewer doesn't have problems with a width
     which is not a multiple of 4, you can comment this. */
  if(width&3)
    paddedWidth+=4-(width&3);
 
  /* initialize data for vnc server */
  rfbScreen = rfbGetScreen(&argc,argv,paddedWidth,height,8,3,3);
  if(!rfbScreen)
    return 1;
  if(argc>1)
    rfbScreen->desktopName = argv[1];
  else
    rfbScreen->desktopName = "Picture";
  rfbScreen->alwaysShared = TRUE;
  rfbScreen->kbdAddEvent = HandleKey;
 
  /* enable http */
  rfbScreen->httpDir = "../webclients";
 
  /* allocate picture and read it */
  if (paddedWidth>SIZE_MAX/3 || (height!=0 && paddedWidth*3>SIZE_MAX/height))
    return 1;
  rfbScreen->frameBuffer = (char*)malloc(paddedWidth*3*height);
  if(!rfbScreen->frameBuffer)
    return 1;
  fread(rfbScreen->frameBuffer,width*3,height,in);
  fclose(in);
 
  /* pad to paddedWidth */
  if(width != paddedWidth) {
    int padCount = 3*(paddedWidth - width);
    for(j=height-1;j>=0;j--) {
      memmove(rfbScreen->frameBuffer+3*paddedWidth*j,
              rfbScreen->frameBuffer+3*width*j,
              3*width);
      memset(rfbScreen->frameBuffer+3*paddedWidth*(j+1)-padCount,
             0,padCount);
    }
  }
 
  /* initialize server */
  rfbInitServer(rfbScreen);
 
  /* run event loop */
  rfbRunEventLoop(rfbScreen,40000,FALSE);
 
  return(0);
}
#endif