win32ss/gdi/ntgdi/dcattr.c

   1 /*
   2  * COPYRIGHT:         See COPYING in the top level directory
   3  * PROJECT:           ReactOS kernel
   4  * PURPOSE:           Functions for creation and destruction of DCs
   5  * FILE:              subsystem/win32/win32k/objects/dcattr.c
   6  * PROGRAMER:         Timo Kreuzer (timo.kreuzer@rectos.org)
   7  */
   8
   9 #include <win32k.h>
  10
  11 #define NDEBUG
  12 #include <debug.h>
  13
  14 #define GDIDCATTRFREE 8
  15
  16 typedef struct _GDI_DC_ATTR_FREELIST
  17 {
  18   LIST_ENTRY Entry;
  19   DWORD nEntries;
  20   PVOID AttrList[GDIDCATTRFREE];
  21 } GDI_DC_ATTR_FREELIST, *PGDI_DC_ATTR_FREELIST;
  22
  23 typedef struct _GDI_DC_ATTR_ENTRY
  24 {
  25   DC_ATTR Attr[GDIDCATTRFREE];
  26 } GDI_DC_ATTR_ENTRY, *PGDI_DC_ATTR_ENTRY;
  27
  28
  29 BOOL
  30 NTAPI
  31 DC_bAllocDcAttr(PDC pdc)
  32 {
  33     PPROCESSINFO ppi;
  34     PDC_ATTR pdcattr;
  35
  36     ppi = PsGetCurrentProcessWin32Process();
  37     ASSERT(ppi);
  38
  39     pdcattr = GdiPoolAllocate(ppi->pPoolDcAttr);
  40     if (!pdcattr)
  41     {
  42         DPRINT1("Could not allocate DC attr\n");
  43         return FALSE;
  44     }
  45
  46     /* Copy the content from the kernel mode dc attr */
  47     pdc->pdcattr = pdcattr;
  48     *pdc->pdcattr = pdc->dcattr;
  49
  50     /* Set the object attribute in the handle table */
  51     GDIOBJ_vSetObjectAttr(&pdc->BaseObject, pdcattr);
  52
  53     DPRINT("DC_AllocDcAttr: pdc=%p, pdc->pdcattr=%p\n", pdc, pdc->pdcattr);
  54     return TRUE;
  55 }
  56
  57 VOID
  58 NTAPI
  59 DC_vFreeDcAttr(PDC pdc)
  60 {
  61     PPROCESSINFO ppi;
  62
  63     if (pdc->pdcattr == &pdc->dcattr)
  64     {
  65         // Internal DC object!
  66         return;
  67     }
  68
  69     /* Reset the object attribute in the handle table */
  70     GDIOBJ_vSetObjectAttr(&pdc->BaseObject, NULL);
  71
  72     ppi = PsGetCurrentProcessWin32Process();
  73     ASSERT(ppi);
  74     GdiPoolFree(ppi->pPoolDcAttr, pdc->pdcattr);
  75
  76     /* Reset to kmode dcattr */
  77     pdc->pdcattr = &pdc->dcattr;
  78 }