graphics/driver.c

   1 /*
   2  * Graphics driver management functions
   3  *
   4  * Copyright 1996 Alexandre Julliard
   5  */
   6
   7 #include <stdio.h>
   8 #include "gdi.h"
   9 #include "heap.h"
  10
  11 typedef struct tagGRAPHICS_DRIVER
  12 {
  13     struct tagGRAPHICS_DRIVER *next;
  14     LPSTR                      name;
  15     const DC_FUNCTIONS        *funcs;
  16 } GRAPHICS_DRIVER;
  17
  18 static GRAPHICS_DRIVER *firstDriver = NULL;
  19 static GRAPHICS_DRIVER *genericDriver = NULL;
  20
  21 /**********************************************************************
  22  *           DRIVER_RegisterDriver
  23  */
  24 BOOL32 DRIVER_RegisterDriver( LPCSTR name, const DC_FUNCTIONS *funcs )
  25 {
  26     GRAPHICS_DRIVER *driver = HeapAlloc( SystemHeap, 0, sizeof(*driver) );
  27     if (!driver) return FALSE;
  28     driver->funcs = funcs;
  29     if (name)
  30     {
  31         driver->name  = HEAP_strdupA( SystemHeap, 0, name );
  32         driver->next  = firstDriver;
  33         firstDriver = driver;
  34         return TRUE;
  35     }
  36     /* No name -> it's the generic driver */
  37     if (genericDriver)
  38     {
  39         fprintf( stderr, "DRIVER_RegisterDriver: already a generic driver\n" );
  40         HeapFree( SystemHeap, 0, driver );
  41         return FALSE;
  42     }
  43     driver->name = NULL;
  44     genericDriver = driver;
  45     return TRUE;
  46 }
  47
  48
  49 /**********************************************************************
  50  *           DRIVER_FindDriver
  51  */
  52 const DC_FUNCTIONS *DRIVER_FindDriver( LPCSTR name )
  53 {
  54     GRAPHICS_DRIVER *driver = firstDriver;
  55     while (driver)
  56     {
  57         if (!lstrcmpi32A( driver->name, name )) return driver->funcs;
  58         driver = driver->next;
  59     }
  60     return genericDriver ? genericDriver->funcs : NULL;
  61 }
  62
  63
  64 /**********************************************************************
  65  *           DRIVER_UnregisterDriver
  66  */
  67 BOOL32 DRIVER_UnregisterDriver( LPCSTR name )
  68 {
  69     if (name)
  70     {
  71         GRAPHICS_DRIVER **ppDriver = &firstDriver;
  72         while (*ppDriver)
  73         {
  74             if (!lstrcmpi32A( (*ppDriver)->name, name ))
  75             {
  76                 GRAPHICS_DRIVER *driver = *ppDriver;
  77                 (*ppDriver) = driver->next;
  78                 HeapFree( SystemHeap, 0, driver->name );
  79                 HeapFree( SystemHeap, 0, driver );
  80                 return TRUE;
  81             }
  82             ppDriver = &(*ppDriver)->next;
  83         }
  84         return FALSE;
  85     }
  86     else
  87     {
  88         if (!genericDriver) return FALSE;
  89         HeapFree( SystemHeap, 0, genericDriver );
  90         genericDriver = NULL;
  91         return TRUE;
  92     }
  93 }