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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
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