b902c8abb6
Xnest variant of ModifyPixmapHeader that creates new Pixmap in parent X server if it's size is modified from 0x0 to anything bigger. xnestCreatePixmap doesn't create pixmap in parent X server if it has dimensions 0x0. If it is later resized and accessed, Xnest will be aborted with BadDrawable error from parent X server because it will use XID 0. This happens with ScratchPixmap, for example as used from XaceCensorImage. Applications using XACE crash Xnest. Reviewed-by: Adam Jackson <ajax@redhat.com>
152 lines
4.2 KiB
C
152 lines
4.2 KiB
C
/*
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Copyright 1993 by Davor Matic
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Permission to use, copy, modify, distribute, and sell this software
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and its documentation for any purpose is hereby granted without fee,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation. Davor Matic makes no representations about
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the suitability of this software for any purpose. It is provided "as
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is" without express or implied warranty.
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*/
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#ifdef HAVE_XNEST_CONFIG_H
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#include <xnest-config.h>
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#endif
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#include <X11/X.h>
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#include <X11/Xproto.h>
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#include "regionstr.h"
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#include "pixmapstr.h"
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#include "scrnintstr.h"
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#include "gc.h"
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#include "servermd.h"
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#include "privates.h"
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#include "mi.h"
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#include "Xnest.h"
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#include "Display.h"
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#include "Screen.h"
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#include "XNPixmap.h"
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DevPrivateKeyRec xnestPixmapPrivateKeyRec;
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PixmapPtr
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xnestCreatePixmap(ScreenPtr pScreen, int width, int height, int depth,
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unsigned usage_hint)
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{
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PixmapPtr pPixmap;
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pPixmap = AllocatePixmap(pScreen, 0);
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if (!pPixmap)
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return NullPixmap;
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pPixmap->drawable.type = DRAWABLE_PIXMAP;
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pPixmap->drawable.class = 0;
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pPixmap->drawable.depth = depth;
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pPixmap->drawable.bitsPerPixel = depth;
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pPixmap->drawable.id = 0;
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pPixmap->drawable.x = 0;
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pPixmap->drawable.y = 0;
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pPixmap->drawable.width = width;
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pPixmap->drawable.height = height;
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pPixmap->drawable.pScreen = pScreen;
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pPixmap->drawable.serialNumber = NEXT_SERIAL_NUMBER;
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pPixmap->refcnt = 1;
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pPixmap->devKind = PixmapBytePad(width, depth);
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pPixmap->usage_hint = usage_hint;
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if (width && height)
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xnestPixmapPriv(pPixmap)->pixmap =
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XCreatePixmap(xnestDisplay,
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xnestDefaultWindows[pScreen->myNum],
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width, height, depth);
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else
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xnestPixmapPriv(pPixmap)->pixmap = 0;
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return pPixmap;
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}
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Bool
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xnestDestroyPixmap(PixmapPtr pPixmap)
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{
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if (--pPixmap->refcnt)
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return TRUE;
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XFreePixmap(xnestDisplay, xnestPixmap(pPixmap));
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FreePixmap(pPixmap);
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return TRUE;
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}
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Bool
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xnestModifyPixmapHeader(PixmapPtr pPixmap, int width, int height, int depth,
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int bitsPerPixel, int devKind, pointer pPixData)
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{
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if(!xnestPixmapPriv(pPixmap)->pixmap && width > 0 && height > 0) {
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xnestPixmapPriv(pPixmap)->pixmap =
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XCreatePixmap(xnestDisplay,
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xnestDefaultWindows[pPixmap->drawable.pScreen->myNum],
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width, height, depth);
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}
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return miModifyPixmapHeader(pPixmap, width, height, depth,
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bitsPerPixel, devKind, pPixData);
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}
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RegionPtr
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xnestPixmapToRegion(PixmapPtr pPixmap)
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{
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XImage *ximage;
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register RegionPtr pReg, pTmpReg;
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register int x, y;
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unsigned long previousPixel, currentPixel;
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BoxRec Box = { 0, 0, 0, 0 };
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Bool overlap;
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ximage = XGetImage(xnestDisplay, xnestPixmap(pPixmap), 0, 0,
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pPixmap->drawable.width, pPixmap->drawable.height,
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1, XYPixmap);
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pReg = RegionCreate(NULL, 1);
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pTmpReg = RegionCreate(NULL, 1);
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if (!pReg || !pTmpReg) {
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XDestroyImage(ximage);
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return NullRegion;
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}
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for (y = 0; y < pPixmap->drawable.height; y++) {
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Box.y1 = y;
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Box.y2 = y + 1;
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previousPixel = 0L;
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for (x = 0; x < pPixmap->drawable.width; x++) {
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currentPixel = XGetPixel(ximage, x, y);
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if (previousPixel != currentPixel) {
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if (previousPixel == 0L) {
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/* left edge */
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Box.x1 = x;
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}
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else if (currentPixel == 0L) {
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/* right edge */
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Box.x2 = x;
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RegionReset(pTmpReg, &Box);
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RegionAppend(pReg, pTmpReg);
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}
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previousPixel = currentPixel;
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}
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}
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if (previousPixel != 0L) {
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/* right edge because of the end of pixmap */
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Box.x2 = pPixmap->drawable.width;
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RegionReset(pTmpReg, &Box);
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RegionAppend(pReg, pTmpReg);
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}
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}
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RegionDestroy(pTmpReg);
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XDestroyImage(ximage);
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RegionValidate(pReg, &overlap);
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return pReg;
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}
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