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 #include <string.h>
  11
  12 typedef struct tagGRAPHICS_DRIVER
  13 {
  14     struct tagGRAPHICS_DRIVER *next;
  15     LPSTR                      name;
  16     const DC_FUNCTIONS        *funcs;
  17 } GRAPHICS_DRIVER;
  18
  19 static GRAPHICS_DRIVER *firstDriver = NULL;
  20 static GRAPHICS_DRIVER *genericDriver = NULL;
  21
  22 /**********************************************************************
  23  *           DRIVER_RegisterDriver
  24  */
  25 BOOL32 DRIVER_RegisterDriver( LPCSTR name, const DC_FUNCTIONS *funcs )
  26 {
  27     GRAPHICS_DRIVER *driver = HeapAlloc( SystemHeap, 0, sizeof(*driver) );
  28     if (!driver) return FALSE;
  29     driver->funcs = funcs;
  30     if (name)
  31     {
  32         driver->name  = HEAP_strdupA( SystemHeap, 0, name );
  33         driver->next  = firstDriver;
  34         firstDriver = driver;
  35         return TRUE;
  36     }
  37     /* No name -> it's the generic driver */
  38     if (genericDriver)
  39     {
  40         WARN(driver, " already a generic driver\n" );
  41         HeapFree( SystemHeap, 0, driver );
  42         return FALSE;
  43     }
  44     driver->name = NULL;
  45     genericDriver = driver;
  46     return TRUE;
  47 }
  48
  49
  50 /**********************************************************************
  51  *           DRIVER_FindDriver
  52  */
  53 const DC_FUNCTIONS *DRIVER_FindDriver( LPCSTR name )
  54 {
  55     GRAPHICS_DRIVER *driver = firstDriver;
  56     while (driver)
  57     {
  58         if (!strcasecmp( driver->name, name )) return driver->funcs;
  59         driver = driver->next;
  60     }
  61     return genericDriver ? genericDriver->funcs : NULL;
  62 }
  63
  64
  65 /**********************************************************************
  66  *           DRIVER_UnregisterDriver
  67  */
  68 BOOL32 DRIVER_UnregisterDriver( LPCSTR name )
  69 {
  70     if (name)
  71     {
  72         GRAPHICS_DRIVER **ppDriver = &firstDriver;
  73         while (*ppDriver)
  74         {
  75             if (!strcasecmp( (*ppDriver)->name, name ))
  76             {
  77                 GRAPHICS_DRIVER *driver = *ppDriver;
  78                 (*ppDriver) = driver->next;
  79                 HeapFree( SystemHeap, 0, driver->name );
  80                 HeapFree( SystemHeap, 0, driver );
  81                 return TRUE;
  82             }
  83             ppDriver = &(*ppDriver)->next;
  84         }
  85         return FALSE;
  86     }
  87     else
  88     {
  89         if (!genericDriver) return FALSE;
  90         HeapFree( SystemHeap, 0, genericDriver );
  91         genericDriver = NULL;
  92         return TRUE;
  93     }
  94 }