graphics/driver.c

   1 /*
   2  * Graphics driver management functions
   3  *
   4  * Copyright 1996 Alexandre Julliard
   5  */
   6
   7 #include "gdi.h"
   8 #include "heap.h"
   9 #include "debug.h"
  10
  11 DEFAULT_DEBUG_CHANNEL(driver)
  12 #include <string.h>
  13
  14 typedef struct tagGRAPHICS_DRIVER
  15 {
  16     struct tagGRAPHICS_DRIVER *next;
  17     LPSTR                      name;
  18     const DC_FUNCTIONS        *funcs;
  19 } GRAPHICS_DRIVER;
  20
  21 static GRAPHICS_DRIVER *firstDriver = NULL;
  22 static GRAPHICS_DRIVER *genericDriver = NULL;
  23
  24 /**********************************************************************
  25  *           DRIVER_RegisterDriver
  26  */
  27 BOOL DRIVER_RegisterDriver( LPCSTR name, const DC_FUNCTIONS *funcs )
  28 {
  29     GRAPHICS_DRIVER *driver = HeapAlloc( SystemHeap, 0, sizeof(*driver) );
  30     if (!driver) return FALSE;
  31     driver->funcs = funcs;
  32     if (name)
  33     {
  34         driver->name  = HEAP_strdupA( SystemHeap, 0, name );
  35         driver->next  = firstDriver;
  36         firstDriver = driver;
  37         return TRUE;
  38     }
  39     /* No name -> it's the generic driver */
  40     if (genericDriver)
  41     {
  42         WARN(driver, " already a generic driver\n" );
  43         HeapFree( SystemHeap, 0, driver );
  44         return FALSE;
  45     }
  46     driver->name = NULL;
  47     genericDriver = driver;
  48     return TRUE;
  49 }
  50
  51
  52 /**********************************************************************
  53  *           DRIVER_FindDriver
  54  */
  55 const DC_FUNCTIONS *DRIVER_FindDriver( LPCSTR name )
  56 {
  57     GRAPHICS_DRIVER *driver = firstDriver;
  58
  59     while (driver && name)
  60     {
  61         if (!strcasecmp( driver->name, name )) return driver->funcs;
  62         driver = driver->next;
  63     }
  64     return genericDriver ? genericDriver->funcs : NULL;
  65 }
  66
  67
  68 /**********************************************************************
  69  *           DRIVER_UnregisterDriver
  70  */
  71 BOOL DRIVER_UnregisterDriver( LPCSTR name )
  72 {
  73     if (name)
  74     {
  75         GRAPHICS_DRIVER **ppDriver = &firstDriver;
  76         while (*ppDriver)
  77         {
  78             if (!strcasecmp( (*ppDriver)->name, name ))
  79             {
  80                 GRAPHICS_DRIVER *driver = *ppDriver;
  81                 (*ppDriver) = driver->next;
  82                 HeapFree( SystemHeap, 0, driver->name );
  83                 HeapFree( SystemHeap, 0, driver );
  84                 return TRUE;
  85             }
  86             ppDriver = &(*ppDriver)->next;
  87         }
  88         return FALSE;
  89     }
  90     else
  91     {
  92         if (!genericDriver) return FALSE;
  93         HeapFree( SystemHeap, 0, genericDriver );
  94         genericDriver = NULL;
  95         return TRUE;
  96     }
  97 }