michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
michael@0:  * vim: sw=2 ts=8 et :
michael@0:  */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "X11Util.h"
michael@0: #include "nsDebug.h"                    // for NS_ASSERTION, etc
michael@0: 
michael@0: namespace mozilla {
michael@0: 
michael@0: void
michael@0: FindVisualAndDepth(Display* aDisplay, VisualID aVisualID,
michael@0:                    Visual** aVisual, int* aDepth)
michael@0: {
michael@0:     const Screen* screen = DefaultScreenOfDisplay(aDisplay);
michael@0: 
michael@0:     for (int d = 0; d < screen->ndepths; d++) {
michael@0:         Depth *d_info = &screen->depths[d];
michael@0:         for (int v = 0; v < d_info->nvisuals; v++) {
michael@0:             Visual* visual = &d_info->visuals[v];
michael@0:             if (visual->visualid == aVisualID) {
michael@0:                 *aVisual = visual;
michael@0:                 *aDepth = d_info->depth;
michael@0:                 return;
michael@0:             }
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     NS_ASSERTION(aVisualID == None, "VisualID not on Screen.");
michael@0:     *aVisual = nullptr;
michael@0:     *aDepth = 0;
michael@0:     return;
michael@0: }
michael@0: 
michael@0: void
michael@0: FinishX(Display* aDisplay)
michael@0: {
michael@0:   unsigned long lastRequest = NextRequest(aDisplay) - 1;
michael@0:   if (lastRequest == LastKnownRequestProcessed(aDisplay))
michael@0:     return;
michael@0: 
michael@0:   XSync(aDisplay, False);
michael@0: }
michael@0: 
michael@0: ScopedXErrorHandler::ErrorEvent* ScopedXErrorHandler::sXErrorPtr;
michael@0: 
michael@0: int
michael@0: ScopedXErrorHandler::ErrorHandler(Display *, XErrorEvent *ev)
michael@0: {
michael@0:     // only record the error if no error was previously recorded.
michael@0:     // this means that in case of multiple errors, it's the first error that we report.
michael@0:     if (!sXErrorPtr->mError.error_code)
michael@0:       sXErrorPtr->mError = *ev;
michael@0:     return 0;
michael@0: }
michael@0: 
michael@0: ScopedXErrorHandler::ScopedXErrorHandler()
michael@0: {
michael@0:     // let sXErrorPtr point to this object's mXError object, but don't reset this mXError object!
michael@0:     // think of the case of nested ScopedXErrorHandler's.
michael@0:     mOldXErrorPtr = sXErrorPtr;
michael@0:     sXErrorPtr = &mXError;
michael@0:     mOldErrorHandler = XSetErrorHandler(ErrorHandler);
michael@0: }
michael@0: 
michael@0: ScopedXErrorHandler::~ScopedXErrorHandler()
michael@0: {
michael@0:     sXErrorPtr = mOldXErrorPtr;
michael@0:     XSetErrorHandler(mOldErrorHandler);
michael@0: }
michael@0: 
michael@0: bool
michael@0: ScopedXErrorHandler::SyncAndGetError(Display *dpy, XErrorEvent *ev)
michael@0: {
michael@0:     FinishX(dpy);
michael@0: 
michael@0:     bool retval = mXError.mError.error_code != 0;
michael@0:     if (ev)
michael@0:         *ev = mXError.mError;
michael@0:     mXError = ErrorEvent(); // reset
michael@0:     return retval;
michael@0: }
michael@0: 
michael@0: } // namespace mozilla