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-rw-r--r--gfx/src/X11Util.cpp94
1 files changed, 94 insertions, 0 deletions
diff --git a/gfx/src/X11Util.cpp b/gfx/src/X11Util.cpp
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+++ b/gfx/src/X11Util.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=8 et :
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "X11Util.h"
+#include "nsDebug.h" // for NS_ASSERTION, etc
+#include "MainThreadUtils.h" // for NS_IsMainThread
+
+namespace mozilla {
+
+void
+FindVisualAndDepth(Display* aDisplay, VisualID aVisualID,
+ Visual** aVisual, int* aDepth)
+{
+ const Screen* screen = DefaultScreenOfDisplay(aDisplay);
+
+ for (int d = 0; d < screen->ndepths; d++) {
+ Depth *d_info = &screen->depths[d];
+ for (int v = 0; v < d_info->nvisuals; v++) {
+ Visual* visual = &d_info->visuals[v];
+ if (visual->visualid == aVisualID) {
+ *aVisual = visual;
+ *aDepth = d_info->depth;
+ return;
+ }
+ }
+ }
+
+ NS_ASSERTION(aVisualID == X11None, "VisualID not on Screen.");
+ *aVisual = nullptr;
+ *aDepth = 0;
+ return;
+}
+
+void
+FinishX(Display* aDisplay)
+{
+ unsigned long lastRequest = NextRequest(aDisplay) - 1;
+ if (lastRequest == LastKnownRequestProcessed(aDisplay))
+ return;
+
+ XSync(aDisplay, False);
+}
+
+ScopedXErrorHandler::ErrorEvent* ScopedXErrorHandler::sXErrorPtr;
+
+int
+ScopedXErrorHandler::ErrorHandler(Display *, XErrorEvent *ev)
+{
+ // only record the error if no error was previously recorded.
+ // this means that in case of multiple errors, it's the first error that we report.
+ if (!sXErrorPtr->mError.error_code)
+ sXErrorPtr->mError = *ev;
+ return 0;
+}
+
+ScopedXErrorHandler::ScopedXErrorHandler(bool aAllowOffMainThread)
+{
+ if (!aAllowOffMainThread) {
+ // Off main thread usage is not safe in general, but OMTC GL layers uses this
+ // with the main thread blocked, which makes it safe.
+ NS_WARNING_ASSERTION(
+ NS_IsMainThread(),
+ "ScopedXErrorHandler being called off main thread, may cause issues");
+ }
+ // let sXErrorPtr point to this object's mXError object, but don't reset this mXError object!
+ // think of the case of nested ScopedXErrorHandler's.
+ mOldXErrorPtr = sXErrorPtr;
+ sXErrorPtr = &mXError;
+ mOldErrorHandler = XSetErrorHandler(ErrorHandler);
+}
+
+ScopedXErrorHandler::~ScopedXErrorHandler()
+{
+ sXErrorPtr = mOldXErrorPtr;
+ XSetErrorHandler(mOldErrorHandler);
+}
+
+bool
+ScopedXErrorHandler::SyncAndGetError(Display *dpy, XErrorEvent *ev)
+{
+ FinishX(dpy);
+
+ bool retval = mXError.mError.error_code != 0;
+ if (ev)
+ *ev = mXError.mError;
+ mXError = ErrorEvent(); // reset
+ return retval;
+}
+
+} // namespace mozilla