559 lines
16 KiB
C
559 lines
16 KiB
C
/*
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* Copyright 2001-2004 Red Hat Inc., Durham, North Carolina.
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*
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation on the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NON-INFRINGEMENT. IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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/*
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* Authors:
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* Kevin E. Martin <kem@redhat.com>
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*
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*/
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/** \file
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* This file provides support for fonts. */
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#ifdef HAVE_DMX_CONFIG_H
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#include <dmx-config.h>
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#endif
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#define DMX_FONTPATH_DEBUG 0
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#include "dmx.h"
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#include "dmxsync.h"
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#include "dmxfont.h"
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#include "dmxlog.h"
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#include <X11/fonts/fontstruct.h>
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#include "dixfont.h"
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#include "dixstruct.h"
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static int (*dmxSaveProcVector[256])(ClientPtr);
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static int dmxFontLastError;
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static int dmxFontErrorHandler(Display *dpy, XErrorEvent *ev)
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{
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dmxFontLastError = ev->error_code;
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return 0;
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}
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static char **dmxGetFontPath(int *npaths)
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{
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char **fp;
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unsigned char *c, *paths;
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char *newfp;
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int len, l, i;
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paths = GetFontPath(npaths, &len);
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newfp = xalloc(*npaths + len);
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c = (unsigned char *)newfp;
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fp = xalloc(*npaths * sizeof(*fp));
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memmove(newfp, paths+1, *npaths + len - 1);
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l = *paths;
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for (i = 0; i < *npaths; i++) {
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fp[i] = (char *)c;
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c += l;
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l = *c;
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*c++ = '\0';
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}
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#if DMX_FONTPATH_DEBUG
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for (i = 0; i < *npaths; i++)
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dmxLog(dmxDebug, "FontPath[%d] = %s\n", i, fp[i]);
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#endif
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return fp;
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}
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static void dmxFreeFontPath(char **fp)
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{
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xfree(fp[0]);
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xfree(fp);
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}
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static Bool dmxCheckFontPathElement(DMXScreenInfo *dmxScreen, char *fp)
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{
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int (*oldErrorHandler)(Display *, XErrorEvent *);
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if (!dmxScreen->beDisplay)
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return TRUE;
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dmxFontLastError = 0;
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oldErrorHandler = XSetErrorHandler(dmxFontErrorHandler);
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XSetFontPath(dmxScreen->beDisplay, &fp, 1);
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dmxSync(dmxScreen, TRUE); /* Must complete before removing handler */
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XSetErrorHandler(oldErrorHandler);
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return (dmxFontLastError == 0);
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}
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static int dmxSetFontPath(DMXScreenInfo *dmxScreen)
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{
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int (*oldErrorHandler)(Display *, XErrorEvent *);
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char **fp;
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int result = Success;
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int npaths;
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if (!dmxScreen->beDisplay)
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return result;
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fp = dmxGetFontPath(&npaths);
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if (!fp) return BadAlloc;
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dmxFontLastError = 0;
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oldErrorHandler = XSetErrorHandler(dmxFontErrorHandler);
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XSetFontPath(dmxScreen->beDisplay, fp, npaths);
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dmxSync(dmxScreen, TRUE); /* Must complete before removing handler */
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XSetErrorHandler(oldErrorHandler);
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if (dmxFontLastError) {
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result = dmxFontLastError;
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/* We could set *error here to the offending path, but it is
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* ignored, so we don't bother figuring out which path is bad.
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* If we do add this support in the future, we'll need to add
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* error to the function's argument list.
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*/
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}
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dmxFreeFontPath(fp);
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return result;
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}
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static int dmxCheckFontPath(DMXScreenInfo *dmxScreen, int *error)
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{
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char **oldFontPath;
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int nOldPaths;
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int result = Success;
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if (!dmxScreen->beDisplay)
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return result;
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/* Save old font path */
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oldFontPath = XGetFontPath(dmxScreen->beDisplay, &nOldPaths);
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result = dmxSetFontPath(dmxScreen);
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/* Restore old font path */
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XSetFontPath(dmxScreen->beDisplay, oldFontPath, nOldPaths);
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XFreeFontPath(oldFontPath);
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dmxSync(dmxScreen, FALSE);
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return result;
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}
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static int dmxProcSetFontPath(ClientPtr client)
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{
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unsigned char *ptr;
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unsigned long nbytes, total, n;
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long nfonts;
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int i, result;
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int error;
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unsigned char *oldFontPath, *tmpFontPath;
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int nOldPaths;
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int lenOldPaths;
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REQUEST(xSetFontPathReq);
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REQUEST_AT_LEAST_SIZE(xSetFontPathReq);
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nbytes = (client->req_len << 2) - sizeof(xSetFontPathReq);
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total = nbytes;
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ptr = (unsigned char *)&stuff[1];
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nfonts = stuff->nFonts;
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while (--nfonts >= 0) {
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if ((total == 0) || (total < (n = (*ptr + 1))))
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return BadLength;
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total -= n;
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ptr += n;
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}
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if (total >= 4)
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return BadLength;
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tmpFontPath = GetFontPath(&nOldPaths, &lenOldPaths);
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oldFontPath = xalloc(nOldPaths + lenOldPaths);
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memmove(oldFontPath, tmpFontPath, nOldPaths + lenOldPaths);
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result = SetFontPath(client, stuff->nFonts, (unsigned char *)&stuff[1],
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&error);
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if (!result) {
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for (i = 0; i < dmxNumScreens; i++)
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if ((result = dmxCheckFontPath(&dmxScreens[i], &error)))
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break;
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if (result) {
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int ignoreresult, ignoreerror;
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/* Restore old fontpath in the DMX server */
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ignoreresult = SetFontPath(client, nOldPaths, oldFontPath,
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&ignoreerror);
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} else {
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result = client->noClientException;
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client->errorValue = error;
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}
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}
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xfree(oldFontPath);
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return result;
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}
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/** Initialize font support. In addition to the screen function call
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* pointers, DMX also hooks in at the ProcVector[] level. Here the old
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* ProcVector function pointers are saved and the new ProcVector
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* function pointers are initialized. */
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void dmxInitFonts(void)
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{
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int i;
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for (i = 0; i < 256; i++)
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dmxSaveProcVector[i] = ProcVector[i];
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ProcVector[X_SetFontPath] = dmxProcSetFontPath;
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}
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/** Reset font support by restoring the original ProcVector function
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* pointers. */
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void dmxResetFonts(void)
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{
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int i;
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for (i = 0; i < 256; i++)
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ProcVector[i] = dmxSaveProcVector[i];
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}
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/** Load the font, \a pFont, on the back-end server associated with \a
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* pScreen. When a font is loaded, the font path on back-end server is
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* first initialized to that specified on the command line with the
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* -fontpath options, and then the font is loaded. */
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Bool dmxBELoadFont(ScreenPtr pScreen, FontPtr pFont)
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{
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DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
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dmxFontPrivPtr pFontPriv = FontGetPrivate(pFont, dmxFontPrivateIndex);
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char *name;
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char **oldFontPath = NULL;
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int nOldPaths;
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Atom name_atom, value_atom;
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int i;
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/* Make sure we have a font private struct to work with */
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if (!pFontPriv)
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return FALSE;
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/* Don't load a font over top of itself */
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if (pFontPriv->font[pScreen->myNum]) {
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return TRUE; /* Already loaded font */
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}
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/* Save old font path */
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oldFontPath = XGetFontPath(dmxScreen->beDisplay, &nOldPaths);
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/* Set the font path for the font about to be loaded on the back-end */
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if (dmxSetFontPath(dmxScreen)) {
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char **fp;
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int npaths;
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Bool *goodfps;
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/* This could fail only when first starting the X server and
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* loading the default font. If it fails here, then the default
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* font path is invalid, no default font path will be set, the
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* DMX server will fail to load the default font, and it will
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* exit with an error unless we remove the offending font paths
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* with the -ignorebadfontpaths command line option.
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*/
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fp = dmxGetFontPath(&npaths);
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if (!fp) {
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dmxLog(dmxError,
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"No default font path set.\n");
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dmxLog(dmxError,
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"Please see the Xdmx man page for information on how to\n");
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dmxLog(dmxError,
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"initialize the DMX server's default font path.\n");
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XFreeFontPath(oldFontPath);
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return FALSE;
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}
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if (!dmxFontPath)
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dmxLog(dmxWarning, "No default font path is set.\n");
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goodfps = xalloc(npaths * sizeof(*goodfps));
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dmxLog(dmxError,
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"The DMX server failed to set the following font paths on "
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"screen #%d:\n", pScreen->myNum);
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for (i = 0; i < npaths; i++)
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if (!(goodfps[i] = dmxCheckFontPathElement(dmxScreen, fp[i])))
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dmxLog(dmxError, " %s\n", fp[i]);
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if (dmxIgnoreBadFontPaths) {
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char *newfp;
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int newnpaths = 0;
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int len = 0;
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int j = 0;
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int error;
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dmxLog(dmxError,
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"These font paths will not be used because the "
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"\"-ignorebadfontpaths\"\n");
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dmxLog(dmxError,
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"option is set.\n");
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for (i = 0; i < npaths; i++)
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if (goodfps[i]) {
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len += strlen(fp[i]) + 1;
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newnpaths++;
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}
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if (!newnpaths) {
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/* No valid font paths were found */
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dmxLog(dmxError,
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"After removing the font paths above, no valid font "
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"paths were\n");
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dmxLog(dmxError,
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"available. Please check that the font paths set on "
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"the command\n");
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dmxLog(dmxError,
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"line or in the configuration file via the "
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"\"-fontpath\" option\n");
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dmxLog(dmxError,
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"are valid on all back-end servers. See the Xdmx man "
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"page for\n");
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dmxLog(dmxError,
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"more information on font paths.\n");
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dmxFreeFontPath(fp);
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XFreeFontPath(oldFontPath);
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xfree(goodfps);
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return FALSE;
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}
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newfp = xalloc(len * sizeof(*newfp));
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for (i = 0; i < npaths; i++) {
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if (goodfps[i]) {
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int n = strlen(fp[i]);
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newfp[j++] = n;
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strncpy(&newfp[j], fp[i], n);
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j += n;
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}
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}
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if (SetFontPath(NULL, newnpaths, (unsigned char *)newfp, &error)) {
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/* Note that this should never happen since all of the
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* FPEs were previously valid. */
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dmxLog(dmxError, "Cannot reset the default font path.\n");
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}
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} else if (dmxFontPath) {
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dmxLog(dmxError,
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"Please remove these font paths from the command line "
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"or\n");
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dmxLog(dmxError,
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"configuration file, or set the \"-ignorebadfontpaths\" "
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"option to\n");
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dmxLog(dmxError,
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"ignore them. For more information on these options, see "
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"the\n");
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dmxLog(dmxError,
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"Xdmx man page.\n");
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} else {
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dmxLog(dmxError,
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"Please specify the font paths that are available on all "
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"back-end\n");
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dmxLog(dmxError,
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"servers with the \"-fontpath\" option, or use the "
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"\"-ignorebadfontpaths\"\n");
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dmxLog(dmxError,
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"to ignore bad defaults. For more information on "
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"these and other\n");
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dmxLog(dmxError,
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"font-path-related options, see the Xdmx man page.\n");
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}
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if (!dmxIgnoreBadFontPaths ||
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(dmxIgnoreBadFontPaths && dmxSetFontPath(dmxScreen))) {
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/* We still have errors so return with error */
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dmxFreeFontPath(fp);
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XFreeFontPath(oldFontPath);
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xfree(goodfps);
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return FALSE;
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}
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}
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/* Find requested font on back-end server */
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name_atom = MakeAtom("FONT", 4, TRUE);
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value_atom = 0L;
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for (i = 0; i < pFont->info.nprops; i++) {
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if ((Atom)pFont->info.props[i].name == name_atom) {
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value_atom = pFont->info.props[i].value;
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break;
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}
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}
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if (!value_atom) return FALSE;
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name = (char *)NameForAtom(value_atom);
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if (!name) return FALSE;
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pFontPriv->font[pScreen->myNum] =
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XLoadQueryFont(dmxScreen->beDisplay, name);
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/* Restore old font path */
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XSetFontPath(dmxScreen->beDisplay, oldFontPath, nOldPaths);
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XFreeFontPath(oldFontPath);
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dmxSync(dmxScreen, FALSE);
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if (!pFontPriv->font[pScreen->myNum]) return FALSE;
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return TRUE;
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}
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/** Realize the font, \a pFont, on the back-end server associated with
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* \a pScreen. */
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Bool dmxRealizeFont(ScreenPtr pScreen, FontPtr pFont)
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{
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DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
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dmxFontPrivPtr pFontPriv;
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if (!(pFontPriv = FontGetPrivate(pFont, dmxFontPrivateIndex))) {
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FontSetPrivate(pFont, dmxFontPrivateIndex, NULL);
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pFontPriv = xalloc(sizeof(dmxFontPrivRec));
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if (!pFontPriv) return FALSE;
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pFontPriv->font = NULL;
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MAXSCREENSALLOC(pFontPriv->font);
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if (!pFontPriv->font) {
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xfree(pFontPriv);
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return FALSE;
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}
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pFontPriv->refcnt = 0;
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}
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FontSetPrivate(pFont, dmxFontPrivateIndex, (pointer)pFontPriv);
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if (dmxScreen->beDisplay) {
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if (!dmxBELoadFont(pScreen, pFont))
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return FALSE;
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pFontPriv->refcnt++;
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} else {
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pFontPriv->font[pScreen->myNum] = NULL;
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}
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return TRUE;
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}
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/** Free \a pFont on the back-end associated with \a pScreen. */
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Bool dmxBEFreeFont(ScreenPtr pScreen, FontPtr pFont)
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{
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DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
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dmxFontPrivPtr pFontPriv = FontGetPrivate(pFont, dmxFontPrivateIndex);
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if (pFontPriv && pFontPriv->font[pScreen->myNum]) {
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XFreeFont(dmxScreen->beDisplay, pFontPriv->font[pScreen->myNum]);
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pFontPriv->font[pScreen->myNum] = NULL;
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return TRUE;
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}
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return FALSE;
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}
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/** Unrealize the font, \a pFont, on the back-end server associated with
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* \a pScreen. */
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Bool dmxUnrealizeFont(ScreenPtr pScreen, FontPtr pFont)
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{
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DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
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dmxFontPrivPtr pFontPriv;
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if ((pFontPriv = FontGetPrivate(pFont, dmxFontPrivateIndex))) {
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/* In case the font failed to load properly */
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if (!pFontPriv->refcnt) {
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MAXSCREENSFREE(pFontPriv->font);
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xfree(pFontPriv);
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FontSetPrivate(pFont, dmxFontPrivateIndex, NULL);
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} else if (pFontPriv->font[pScreen->myNum]) {
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if (dmxScreen->beDisplay)
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dmxBEFreeFont(pScreen, pFont);
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/* The code below is non-obvious, so here's an explanation...
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*
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* When creating the default GC, the server opens up the
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* default font once for each screen, which in turn calls
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* the RealizeFont function pointer once for each screen.
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* During this process both dix's font refcnt and DMX's font
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* refcnt are incremented once for each screen.
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*
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* Later, when shutting down the X server, dix shuts down
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* each screen in reverse order. During this shutdown
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* procedure, each screen's default GC is freed and then
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* that screen is closed by calling the CloseScreen function
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* pointer. screenInfo.numScreens is then decremented after
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* closing each screen. This procedure means that the dix's
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* font refcnt for the font used by the default GC's is
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* decremented once for each screen # greater than 0.
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* However, since dix's refcnt for the default font is not
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* yet 0 for each screen greater than 0, no call to the
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* UnrealizeFont function pointer is made for those screens.
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* Then, when screen 0 is being closed, dix's font refcnt
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* for the default GC's font is finally 0 and the font is
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* unrealized. However, since screenInfo.numScreens has
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* been decremented already down to 1, only one call to
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* UnrealizeFont is made (for screen 0). Thus, even though
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* RealizeFont was called once for each screen,
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* UnrealizeFont is only called for screen 0.
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|
*
|
|
* This is a bug in dix.
|
|
*
|
|
* To avoid the memory leak of pFontPriv for each server
|
|
* generation, we can also free pFontPriv if the refcnt is
|
|
* not yet 0 but the # of screens is 1 -- i.e., the case
|
|
* described in the dix bug above. This is only a temporary
|
|
* workaround until the bug in dix is solved.
|
|
*
|
|
* The other problem is that the font structure allocated by
|
|
* XLoadQueryFont() above is not freed for screens > 0.
|
|
* This problem cannot be worked around here since the back-
|
|
* end displays for screens > 0 have already been closed by
|
|
* the time this code is called from dix.
|
|
*
|
|
* When the bug in dix described above is fixed, then we can
|
|
* remove the "|| screenInfo.numScreens == 1" code below and
|
|
* the memory leaks will be eliminated.
|
|
*/
|
|
if (--pFontPriv->refcnt == 0
|
|
#if 1
|
|
/* Remove this code when the dix bug is fixed */
|
|
|| screenInfo.numScreens == 1
|
|
#endif
|
|
) {
|
|
MAXSCREENSFREE(pFontPriv->font);
|
|
xfree(pFontPriv);
|
|
FontSetPrivate(pFont, dmxFontPrivateIndex, NULL);
|
|
}
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|