1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2 * vim: sw=2 ts=8 et :
3 */
4 /* This Source Code Form is subject to the terms of the Mozilla Public
5 * License, v. 2.0. If a copy of the MPL was not distributed with this
6 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
7
8 #include "X11Util.h"
9 #include "nsDebug.h" // for NS_ASSERTION, etc
10 #include "MainThreadUtils.h" // for NS_IsMainThread
11
12 namespace mozilla {
13
FindVisualAndDepth(Display * aDisplay,VisualID aVisualID,Visual ** aVisual,int * aDepth)14 void FindVisualAndDepth(Display* aDisplay, VisualID aVisualID, Visual** aVisual,
15 int* aDepth) {
16 const Screen* screen = DefaultScreenOfDisplay(aDisplay);
17
18 for (int d = 0; d < screen->ndepths; d++) {
19 Depth* d_info = &screen->depths[d];
20 for (int v = 0; v < d_info->nvisuals; v++) {
21 Visual* visual = &d_info->visuals[v];
22 if (visual->visualid == aVisualID) {
23 *aVisual = visual;
24 *aDepth = d_info->depth;
25 return;
26 }
27 }
28 }
29
30 NS_ASSERTION(aVisualID == X11None, "VisualID not on Screen.");
31 *aVisual = nullptr;
32 *aDepth = 0;
33 }
34
FinishX(Display * aDisplay)35 void FinishX(Display* aDisplay) {
36 unsigned long lastRequest = NextRequest(aDisplay) - 1;
37 if (lastRequest == LastKnownRequestProcessed(aDisplay)) return;
38
39 XSync(aDisplay, X11False);
40 }
41
42 ScopedXErrorHandler::ErrorEvent* ScopedXErrorHandler::sXErrorPtr;
43
ErrorHandler(Display *,XErrorEvent * ev)44 int ScopedXErrorHandler::ErrorHandler(Display*, XErrorEvent* ev) {
45 // only record the error if no error was previously recorded.
46 // this means that in case of multiple errors, it's the first error that we
47 // report.
48 if (!sXErrorPtr->mError.error_code) sXErrorPtr->mError = *ev;
49 return 0;
50 }
51
ScopedXErrorHandler(bool aAllowOffMainThread)52 ScopedXErrorHandler::ScopedXErrorHandler(bool aAllowOffMainThread) {
53 if (!aAllowOffMainThread) {
54 // Off main thread usage is not safe in general, but OMTC GL layers uses
55 // this with the main thread blocked, which makes it safe.
56 NS_WARNING_ASSERTION(
57 NS_IsMainThread(),
58 "ScopedXErrorHandler being called off main thread, may cause issues");
59 }
60 // let sXErrorPtr point to this object's mXError object, but don't reset this
61 // mXError object! think of the case of nested ScopedXErrorHandler's.
62 mOldXErrorPtr = sXErrorPtr;
63 sXErrorPtr = &mXError;
64 mOldErrorHandler = XSetErrorHandler(ErrorHandler);
65 }
66
~ScopedXErrorHandler()67 ScopedXErrorHandler::~ScopedXErrorHandler() {
68 sXErrorPtr = mOldXErrorPtr;
69 XSetErrorHandler(mOldErrorHandler);
70 }
71
SyncAndGetError(Display * dpy,XErrorEvent * ev)72 bool ScopedXErrorHandler::SyncAndGetError(Display* dpy, XErrorEvent* ev) {
73 FinishX(dpy);
74
75 bool retval = mXError.mError.error_code != 0;
76 if (ev) *ev = mXError.mError;
77 mXError = ErrorEvent(); // reset
78 return retval;
79 }
80
81 } // namespace mozilla
82