8976e9766e
It lets the driver notify the server whether it can draw a background when '-background none' option is used by the system platform. Use cases for that could be video drivers performing mode-setting in kernel time, before X is up, so a seamless transition would happen until X clients start to show up. If the driver can copy the framebuffer cleanly then it can set the flag (canDoBGNoneRoot), otherwise the server will fallback to the normal behaviour. The system must explicit indicates willingness of doing so through '-background none'. We could do this option as default; in such case, malicious users would be able to steal the framebuffer with a bit of tricks. For instance, I can see the content of my nVidia Quadro FX 580 framebuffer old X session modifying a bit nv driver: xf86DPMSInit(pScreen, xf86DPMSSet, 0); - /* Clear the screen */ - if(pNv->xaa) { - /* Use the acceleration engine */ - pNv->xaa->SetupForSolidFill(pScrn, 0, GXcopy, ~0); - pNv->xaa->SubsequentSolidFillRect(pScrn, - 0, 0, pScrn->displayWidth, pNv->offscreenHeight); - G80DmaKickoff(pNv); - } else { - /* Use a slow software clear path */ - memset(pNv->mem, 0, pitch * pNv->offscreenHeight); - } + pScreen->canDoBGNoneRoot = TRUE; The commit is originally based on discussions happened on xorg-devel: http://lists.freedesktop.org/archives/xorg-devel/2010-June/009755.html Signed-off-by: Tiago Vignatti <tiago.vignatti@nokia.com> Reviewed-by: Rami Ylimäki <rami.ylimaki@vincit.fi> Acked-by: Pauli Nieminen <ext-pauli.nieminen@nokia.com> Reviewed-by: Daniel Stone <daniel@fooishbar.org>
78 lines
2.5 KiB
C
78 lines
2.5 KiB
C
/*
|
|
|
|
Copyright 1987, 1998 The Open Group
|
|
|
|
Permission to use, copy, modify, distribute, and sell this software and its
|
|
documentation for any purpose is hereby granted without fee, provided that
|
|
the above copyright notice appear in all copies and that both that
|
|
copyright notice and this permission notice appear in supporting
|
|
documentation.
|
|
|
|
The above copyright notice and this permission notice shall be included
|
|
in all copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
|
|
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
|
IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
|
|
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
|
|
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
|
|
OTHER DEALINGS IN THE SOFTWARE.
|
|
|
|
Except as contained in this notice, the name of The Open Group shall
|
|
not be used in advertising or otherwise to promote the sale, use or
|
|
other dealings in this Software without prior written authorization
|
|
from The Open Group.
|
|
|
|
*/
|
|
|
|
#ifndef OPAQUE_H
|
|
#define OPAQUE_H
|
|
|
|
#include <X11/Xmd.h>
|
|
|
|
#include "globals.h"
|
|
|
|
extern _X_EXPORT char *defaultTextFont;
|
|
extern _X_EXPORT char *defaultCursorFont;
|
|
extern _X_EXPORT int MaxClients;
|
|
extern _X_EXPORT volatile char isItTimeToYield;
|
|
extern _X_EXPORT volatile char dispatchException;
|
|
|
|
/* bit values for dispatchException */
|
|
#define DE_RESET 1
|
|
#define DE_TERMINATE 2
|
|
#define DE_PRIORITYCHANGE 4 /* set when a client's priority changes */
|
|
|
|
extern _X_EXPORT CARD32 TimeOutValue;
|
|
extern _X_EXPORT int ScreenSaverBlanking;
|
|
extern _X_EXPORT int ScreenSaverAllowExposures;
|
|
extern _X_EXPORT int defaultScreenSaverBlanking;
|
|
extern _X_EXPORT int defaultScreenSaverAllowExposures;
|
|
extern _X_EXPORT char *display;
|
|
|
|
extern _X_EXPORT int defaultBackingStore;
|
|
extern _X_EXPORT Bool disableBackingStore;
|
|
extern _X_EXPORT Bool enableBackingStore;
|
|
extern _X_EXPORT Bool PartialNetwork;
|
|
extern _X_EXPORT Bool RunFromSigStopParent;
|
|
#ifdef RLIMIT_DATA
|
|
extern _X_EXPORT int limitDataSpace;
|
|
#endif
|
|
#ifdef RLIMIT_STACK
|
|
extern _X_EXPORT int limitStackSpace;
|
|
#endif
|
|
#ifdef RLIMIT_NOFILE
|
|
extern _X_EXPORT int limitNoFile;
|
|
#endif
|
|
extern _X_EXPORT Bool defeatAccessControl;
|
|
extern _X_EXPORT long maxBigRequestSize;
|
|
extern _X_EXPORT Bool party_like_its_1989;
|
|
extern _X_EXPORT Bool whiteRoot;
|
|
extern _X_EXPORT Bool bgNoneRoot;
|
|
|
|
extern _X_EXPORT Bool CoreDump;
|
|
|
|
|
|
#endif /* OPAQUE_H */
|