kc3-lang/freetype/demos/graph/grinit.c

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• Hash : e49ab25c
  Author :
  Date : 2000-05-16T23:44:38
  

  formatting - removed trailing spaces
  

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• demos/graph/grinit.c

• #include "grobjs.h"
  #include "grdevice.h"
  #include <stdio.h>
  
  #define GR_INIT_DEVICE_CHAIN   ((grDeviceChain*)0)
  #define GR_INIT_BUILD
  
  #ifdef DEVICE_X11
  #include "grx11.h"
  #endif
  
  #ifdef DEVICE_OS2_PM
  #include "gros2pm.h"
  #endif
  
  #ifdef DEVICE_WIN32
  #include "grwin32.h"
  #endif
  
  #ifdef macintosh
  #include "grmac.h"
  #endif
  
  
   /**********************************************************************
    *
    * <Function>
    *    grInitDevices
    *
    * <Description>
    *    This function is in charge of initialising all system-specific
    *    devices. A device is responsible for creating and managing one
    *    or more "surfaces". A surface is either a window or a screen,
    *    depending on the system.
    *
    * <Return>
    *    a pointer to the first element of a device chain. The chain can
    *    be parsed to find the available devices on the current system
    *
    * <Note>
    *    If a device cannot be initialised correctly, it is not part of
    *    the device chain returned by this function. For example, if an
    *    X11 device was compiled in the library, it will be part of
    *    the returned device chain only if a connection to the display
    *    could be establisged
    *
    *    If no driver could be initialised, this function returns NULL.
    *
    **********************************************************************/
  
    extern
    grDeviceChain*  grInitDevices( void )
    {
      grDeviceChain*  chain = GR_INIT_DEVICE_CHAIN;
      grDeviceChain*  cur   = gr_device_chain;
  
      while (chain)
      {
        /* initialize the device */
        grDevice*  device;
  
        device = chain->device;
        if ( device->init() == 0             &&
             gr_num_devices < GR_MAX_DEVICES )
  
        {
          /* successful device initialisation - add it to our chain */
          cur->next   = 0;
          cur->device = device;
          cur->name   = device->device_name;
  
          if (cur > gr_device_chain)
            cur[-1].next = cur;
  
          cur++;
          gr_num_devices++;
        }
        chain = chain->next;
      }
  
      return (gr_num_devices > 0 ? gr_device_chain : 0 );
    }
  
  
  
  

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