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