Bug Summary

File:var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp
Warning:line 345, column 29
Called C++ object pointer is uninitialized

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name GLContextProviderGLX.cpp -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -fhalf-no-semantic-interposition -mframe-pointer=all -relaxed-aliasing -ffp-contract=off -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/gfx/gl -fcoverage-compilation-dir=/var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/gfx/gl -resource-dir /usr/lib/llvm-20/lib/clang/20 -include /var/lib/jenkins/workspace/firefox-scan-build/config/gcc_hidden.h -include /var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/mozilla-config.h -I /var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/dist/stl_wrappers -I /var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/dist/system_wrappers -U _FORTIFY_SOURCE -D _FORTIFY_SOURCE=2 -D _GLIBCXX_ASSERTIONS -D DEBUG=1 -D MOZ_HAS_MOZGLUE -D MOZILLA_INTERNAL_API -D IMPL_LIBXUL -D MOZ_SUPPORT_LEAKCHECKING -D STATIC_EXPORTABLE_JS_API -I /var/lib/jenkins/workspace/firefox-scan-build/gfx/gl -I /var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/gfx/gl -I /var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/ipc/ipdl/_ipdlheaders -I /var/lib/jenkins/workspace/firefox-scan-build/ipc/chromium/src -I /var/lib/jenkins/workspace/firefox-scan-build/gfx/skia -I /var/lib/jenkins/workspace/firefox-scan-build/gfx/skia/skia -I /var/lib/jenkins/workspace/firefox-scan-build/gfx/cairo/cairo/src -I /var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/dist/include -I /var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/dist/include/nspr -I /var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/dist/include/nss -D MOZILLA_CLIENT -I /usr/include/gtk-3.0 -I /usr/include/pango-1.0 -I /usr/include/glib-2.0 -I /usr/lib/x86_64-linux-gnu/glib-2.0/include -I /usr/include/sysprof-6 -I /usr/include/harfbuzz -I /usr/include/freetype2 -I /usr/include/libpng16 -I /usr/include/libmount -I /usr/include/blkid -I /usr/include/fribidi -I /usr/include/cairo -I /usr/include/pixman-1 -I /usr/include/gdk-pixbuf-2.0 -I /usr/include/x86_64-linux-gnu -I /usr/include/webp -I /usr/include/gio-unix-2.0 -I /usr/include/cloudproviders -I /usr/include/atk-1.0 -I /usr/include/at-spi2-atk/2.0 -I /usr/include/at-spi-2.0 -I /usr/include/dbus-1.0 -I /usr/lib/x86_64-linux-gnu/dbus-1.0/include -I /usr/include/gtk-3.0/unix-print -I /usr/include/gtk-3.0 -I /usr/include/pango-1.0 -I /usr/include/glib-2.0 -I /usr/lib/x86_64-linux-gnu/glib-2.0/include -I /usr/include/sysprof-6 -I /usr/include/harfbuzz -I /usr/include/freetype2 -I /usr/include/libpng16 -I /usr/include/libmount -I /usr/include/blkid -I /usr/include/fribidi -I /usr/include/cairo -I /usr/include/pixman-1 -I /usr/include/gdk-pixbuf-2.0 -I /usr/include/x86_64-linux-gnu -I /usr/include/webp -I /usr/include/gio-unix-2.0 -I /usr/include/cloudproviders -I /usr/include/atk-1.0 -I /usr/include/at-spi2-atk/2.0 -I /usr/include/at-spi-2.0 -I /usr/include/dbus-1.0 -I /usr/lib/x86_64-linux-gnu/dbus-1.0/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../include/c++/14 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../include/x86_64-linux-gnu/c++/14 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../include/c++/14/backward -internal-isystem /usr/lib/llvm-20/lib/clang/20/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-error=tautological-type-limit-compare -Wno-invalid-offsetof -Wno-range-loop-analysis -Wno-deprecated-anon-enum-enum-conversion -Wno-deprecated-enum-enum-conversion -Wno-deprecated-this-capture -Wno-inline-new-delete -Wno-error=deprecated-declarations -Wno-error=array-bounds -Wno-error=free-nonheap-object -Wno-error=atomic-alignment -Wno-error=deprecated-builtins -Wno-psabi -Wno-error=builtin-macro-redefined -Wno-vla-cxx-extension -Wno-unknown-warning-option -fdeprecated-macro -ferror-limit 19 -fstrict-flex-arrays=1 -stack-protector 2 -fstack-clash-protection -ftrivial-auto-var-init=pattern -fno-rtti -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fno-sized-deallocation -fno-aligned-allocation -vectorize-loops -vectorize-slp -analyzer-checker optin.performance.Padding -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2025-01-20-090804-167946-1 -x c++ /var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp
1/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2/* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6#ifdef MOZ_WIDGET_GTK1
7# include <gdk/gdk.h>
8# include <gdk/gdkx.h>
9# define GET_NATIVE_WINDOW(aWidget)(gdk_x11_window_get_xid ((GdkWindow*)aWidget->GetNativeData
(0))) \
10 GDK_WINDOW_XID((GdkWindow*)aWidget->GetNativeData(NS_NATIVE_WINDOW))(gdk_x11_window_get_xid ((GdkWindow*)aWidget->GetNativeData
(0)))
11#endif
12
13#include <X11/Xlib.h>
14#include <X11/Xutil.h>
15#include "X11UndefineNone.h"
16
17#include "mozilla/MathAlgorithms.h"
18#include "mozilla/StaticPtr.h"
19#include "mozilla/layers/CompositorOptions.h"
20#include "mozilla/Range.h"
21#include "mozilla/ScopeExit.h"
22#include "mozilla/Sprintf.h"
23#include "mozilla/StaticPrefs_gfx.h"
24#include "mozilla/StaticPrefs_layout.h"
25#include "mozilla/widget/CompositorWidget.h"
26#include "mozilla/widget/GtkCompositorWidget.h"
27#include "mozilla/Unused.h"
28
29#include "prenv.h"
30#include "GLContextProvider.h"
31#include "GLLibraryLoader.h"
32#include "nsDebug.h"
33#include "nsIWidget.h"
34#include "GLXLibrary.h"
35#include "gfxContext.h"
36#include "gfxEnv.h"
37#include "gfxPlatform.h"
38#include "GLContextGLX.h"
39#include "gfxUtils.h"
40#include "gfx2DGlue.h"
41#include "GLScreenBuffer.h"
42
43#include "gfxCrashReporterUtils.h"
44
45#ifdef MOZ_WIDGET_GTK1
46# include "gfxPlatformGtk.h"
47#endif
48
49namespace mozilla::gl {
50
51using namespace mozilla::gfx;
52using namespace mozilla::widget;
53
54MOZ_RUNINIT GLXLibrary sGLXLibrary;
55
56static inline bool HasExtension(const char* aExtensions,
57 const char* aRequiredExtension) {
58 return GLContext::ListHasExtension(
59 reinterpret_cast<const GLubyte*>(aExtensions), aRequiredExtension);
60}
61
62bool GLXLibrary::EnsureInitialized(Display* aDisplay) {
63 if (mInitialized) {
64 return true;
65 }
66
67 // Don't repeatedly try to initialize.
68 if (mTriedInitializing) {
69 return false;
70 }
71 mTriedInitializing = true;
72
73 MOZ_ASSERT(aDisplay)do { static_assert( mozilla::detail::AssertionConditionType<
decltype(aDisplay)>::isValid, "invalid assertion condition"
); if ((__builtin_expect(!!(!(!!(aDisplay))), 0))) { do { } while
(false); MOZ_ReportAssertionFailure("aDisplay", "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 73); AnnotateMozCrashReason("MOZ_ASSERT" "(" "aDisplay" ")"
); do { *((volatile int*)__null) = 73; __attribute__((nomerge
)) ::abort(); } while (false); } } while (false);
74 if (!aDisplay) {
75 return false;
76 }
77
78 // Force enabling s3 texture compression. (Bug 774134)
79 PR_SetEnv("force_s3tc_enable=true");
80
81 if (!mOGLLibrary) {
82 // see e.g. bug 608526: it is intrinsically interesting to know whether we
83 // have dynamically linked to libGL.so.1 because at least the NVIDIA
84 // implementation requires an executable stack, which causes mprotect calls,
85 // which trigger glibc bug
86 // http://sourceware.org/bugzilla/show_bug.cgi?id=12225
87 const char* libGLfilename = "libGL.so.1";
88#if defined(__OpenBSD__) || defined(__NetBSD__)
89 libGLfilename = "libGL.so";
90#endif
91
92 const bool forceFeatureReport = false;
93 ScopedGfxFeatureReporter reporter(libGLfilename, forceFeatureReport);
94 mOGLLibrary = PR_LoadLibrary(libGLfilename);
95 if (!mOGLLibrary) {
96 NS_WARNING("Couldn't load OpenGL shared library.")NS_DebugBreak(NS_DEBUG_WARNING, "Couldn't load OpenGL shared library."
, nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 96);
97 return false;
98 }
99 reporter.SetSuccessful();
100 }
101
102 if (gfxEnv::MOZ_GLX_DEBUG()) {
103 mDebug = true;
104 }
105
106#define SYMBOL(X){ (PRFuncPtr*)&mSymbols.fX, { { "glX" "X" } } } \
107 { \
108 (PRFuncPtr*)&mSymbols.f##X, { \
109 { "glX" #X } \
110 } \
111 }
112#define END_OF_SYMBOLS{ nullptr, {} } \
113 { \
114 nullptr, {} \
115 }
116
117 const SymLoadStruct symbols[] = {
118 /* functions that were in GLX 1.0 */
119 SYMBOL(DestroyContext){ (PRFuncPtr*)&mSymbols.fDestroyContext, { { "glX" "DestroyContext"
} } },
120 SYMBOL(MakeCurrent){ (PRFuncPtr*)&mSymbols.fMakeCurrent, { { "glX" "MakeCurrent"
} } },
121 SYMBOL(SwapBuffers){ (PRFuncPtr*)&mSymbols.fSwapBuffers, { { "glX" "SwapBuffers"
} } },
122 SYMBOL(QueryVersion){ (PRFuncPtr*)&mSymbols.fQueryVersion, { { "glX" "QueryVersion"
} } },
123 SYMBOL(GetConfig){ (PRFuncPtr*)&mSymbols.fGetConfig, { { "glX" "GetConfig"
} } },
124 SYMBOL(GetCurrentContext){ (PRFuncPtr*)&mSymbols.fGetCurrentContext, { { "glX" "GetCurrentContext"
} } },
125 SYMBOL(WaitGL){ (PRFuncPtr*)&mSymbols.fWaitGL, { { "glX" "WaitGL" } } },
126 SYMBOL(WaitX){ (PRFuncPtr*)&mSymbols.fWaitX, { { "glX" "WaitX" } } },
127
128 /* functions introduced in GLX 1.1 */
129 SYMBOL(QueryExtensionsString){ (PRFuncPtr*)&mSymbols.fQueryExtensionsString, { { "glX"
"QueryExtensionsString" } } },
130 SYMBOL(GetClientString){ (PRFuncPtr*)&mSymbols.fGetClientString, { { "glX" "GetClientString"
} } },
131 SYMBOL(QueryServerString){ (PRFuncPtr*)&mSymbols.fQueryServerString, { { "glX" "QueryServerString"
} } },
132
133 /* functions introduced in GLX 1.3 */
134 SYMBOL(ChooseFBConfig){ (PRFuncPtr*)&mSymbols.fChooseFBConfig, { { "glX" "ChooseFBConfig"
} } },
135 SYMBOL(ChooseVisual){ (PRFuncPtr*)&mSymbols.fChooseVisual, { { "glX" "ChooseVisual"
} } },
136 SYMBOL(GetFBConfigAttrib){ (PRFuncPtr*)&mSymbols.fGetFBConfigAttrib, { { "glX" "GetFBConfigAttrib"
} } },
137 SYMBOL(GetFBConfigs){ (PRFuncPtr*)&mSymbols.fGetFBConfigs, { { "glX" "GetFBConfigs"
} } },
138 SYMBOL(CreatePixmap){ (PRFuncPtr*)&mSymbols.fCreatePixmap, { { "glX" "CreatePixmap"
} } },
139 SYMBOL(DestroyPixmap){ (PRFuncPtr*)&mSymbols.fDestroyPixmap, { { "glX" "DestroyPixmap"
} } },
140 SYMBOL(CreateNewContext){ (PRFuncPtr*)&mSymbols.fCreateNewContext, { { "glX" "CreateNewContext"
} } },
141
142 // Core in GLX 1.4, ARB extension before.
143 {(PRFuncPtr*)&mSymbols.fGetProcAddress,
144 {{"glXGetProcAddress", "glXGetProcAddressARB"}}},
145 END_OF_SYMBOLS{ nullptr, {} }};
146
147 {
148 const SymbolLoader libLoader(*mOGLLibrary);
149 if (!libLoader.LoadSymbols(symbols)) {
150 NS_WARNING("Couldn't load required GLX symbols.")NS_DebugBreak(NS_DEBUG_WARNING, "Couldn't load required GLX symbols."
, nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 150);
151 return false;
152 }
153 }
154 const SymbolLoader pfnLoader(mSymbols.fGetProcAddress);
155
156 int screen = DefaultScreen(aDisplay)(((_XPrivDisplay)(aDisplay))->default_screen);
157
158 {
159 int major, minor;
160 if (!fQueryVersion(aDisplay, &major, &minor) || major != 1 || minor < 3) {
161 NS_ERROR("GLX version older than 1.3. (released in 1998)")do { NS_DebugBreak(NS_DEBUG_ASSERTION, "GLX version older than 1.3. (released in 1998)"
, "Error", "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 161); MOZ_PretendNoReturn(); } while (0);
162 return false;
163 }
164 }
165
166 const SymLoadStruct symbols_createcontext[] = {
167 SYMBOL(CreateContextAttribsARB){ (PRFuncPtr*)&mSymbols.fCreateContextAttribsARB, { { "glX"
"CreateContextAttribsARB" } } }, END_OF_SYMBOLS{ nullptr, {} }};
168
169 const SymLoadStruct symbols_videosync[] = {
170 SYMBOL(GetVideoSyncSGI){ (PRFuncPtr*)&mSymbols.fGetVideoSyncSGI, { { "glX" "GetVideoSyncSGI"
} } }, SYMBOL(WaitVideoSyncSGI){ (PRFuncPtr*)&mSymbols.fWaitVideoSyncSGI, { { "glX" "WaitVideoSyncSGI"
} } }, END_OF_SYMBOLS{ nullptr, {} }};
171
172 const SymLoadStruct symbols_swapcontrol[] = {SYMBOL(SwapIntervalEXT){ (PRFuncPtr*)&mSymbols.fSwapIntervalEXT, { { "glX" "SwapIntervalEXT"
} } },
173 END_OF_SYMBOLS{ nullptr, {} }};
174
175 const SymLoadStruct symbols_querydrawable[] = {SYMBOL(QueryDrawable){ (PRFuncPtr*)&mSymbols.fQueryDrawable, { { "glX" "QueryDrawable"
} } },
176 END_OF_SYMBOLS{ nullptr, {} }};
177
178 const auto fnLoadSymbols = [&](const SymLoadStruct* symbols) {
179 if (pfnLoader.LoadSymbols(symbols)) return true;
180
181 ClearSymbols(symbols);
182 return false;
183 };
184
185 const char* clientVendor = fGetClientString(aDisplay, LOCAL_GLX_VENDOR0x1);
186 const char* serverVendor =
187 fQueryServerString(aDisplay, screen, LOCAL_GLX_VENDOR0x1);
188 const char* extensionsStr = fQueryExtensionsString(aDisplay, screen);
189
190 if (HasExtension(extensionsStr, "GLX_ARB_create_context") &&
191 HasExtension(extensionsStr, "GLX_ARB_create_context_profile") &&
192 fnLoadSymbols(symbols_createcontext)) {
193 mHasCreateContextAttribs = true;
194 }
195
196 if (HasExtension(extensionsStr, "GLX_ARB_create_context_robustness")) {
197 mHasRobustness = true;
198 }
199
200 if (HasExtension(extensionsStr, "GLX_NV_robustness_video_memory_purge")) {
201 mHasVideoMemoryPurge = true;
202 }
203
204 if (HasExtension(extensionsStr, "GLX_SGI_video_sync") &&
205 fnLoadSymbols(symbols_videosync)) {
206 mHasVideoSync = true;
207 }
208
209 if (!HasExtension(extensionsStr, "GLX_EXT_swap_control") ||
210 !fnLoadSymbols(symbols_swapcontrol)) {
211 NS_WARNING(NS_DebugBreak(NS_DEBUG_WARNING, "GLX_swap_control unsupported, ASAP mode may still block on buffer "
"swaps.", nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 213)
212 "GLX_swap_control unsupported, ASAP mode may still block on buffer "NS_DebugBreak(NS_DEBUG_WARNING, "GLX_swap_control unsupported, ASAP mode may still block on buffer "
"swaps.", nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 213)
213 "swaps.")NS_DebugBreak(NS_DEBUG_WARNING, "GLX_swap_control unsupported, ASAP mode may still block on buffer "
"swaps.", nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 213);
214 }
215
216 if (HasExtension(extensionsStr, "GLX_EXT_buffer_age") &&
217 fnLoadSymbols(symbols_querydrawable)) {
218 mHasBufferAge = true;
219 }
220
221 mIsATI = serverVendor && DoesStringMatch(serverVendor, "ATI");
222 mIsNVIDIA =
223 serverVendor && DoesStringMatch(serverVendor, "NVIDIA Corporation");
224 mClientIsMesa = clientVendor && DoesStringMatch(clientVendor, "Mesa");
225
226 mInitialized = true;
227
228 // This needs to be after `fQueryServerString` is called so that the
229 // driver is loaded.
230 MesaMemoryLeakWorkaround();
231
232 return true;
233}
234
235bool GLXLibrary::SupportsVideoSync(Display* aDisplay) {
236 if (!EnsureInitialized(aDisplay)) {
237 return false;
238 }
239
240 return mHasVideoSync;
241}
242
243static int (*sOldErrorHandler)(Display*, XErrorEvent*);
244static XErrorEvent sErrorEvent = {};
245
246static int GLXErrorHandler(Display* display, XErrorEvent* ev) {
247 if (!sErrorEvent.error_code) {
248 sErrorEvent = *ev;
249 }
250 return 0;
251}
252
253GLXLibrary::WrapperScope::WrapperScope(const GLXLibrary& glx,
254 const char* const funcName,
255 Display* aDisplay)
256 : mGlx(glx), mFuncName(funcName), mDisplay(aDisplay) {
257 if (mGlx.mDebug) {
258 sOldErrorHandler = XSetErrorHandler(GLXErrorHandler);
259 }
260}
261
262GLXLibrary::WrapperScope::~WrapperScope() {
263 if (mGlx.mDebug) {
264 if (mDisplay) {
265 FinishX(mDisplay);
266 }
267 if (sErrorEvent.error_code) {
268 char buffer[100] = {};
269 if (mDisplay) {
270 XGetErrorText(mDisplay, sErrorEvent.error_code, buffer, sizeof(buffer));
271 } else {
272 SprintfLiteral(buffer, "%d", sErrorEvent.error_code);
273 }
274 printf_stderr("X ERROR after %s: %s (%i) - Request: %i.%i, Serial: %lu",
275 mFuncName, buffer, sErrorEvent.error_code,
276 sErrorEvent.request_code, sErrorEvent.minor_code,
277 sErrorEvent.serial);
278 MOZ_ASSERT_UNREACHABLE("AfterGLXCall sErrorEvent")do { static_assert( mozilla::detail::AssertionConditionType<
decltype(false)>::isValid, "invalid assertion condition");
if ((__builtin_expect(!!(!(!!(false))), 0))) { do { } while (
false); MOZ_ReportAssertionFailure("false" " (" "MOZ_ASSERT_UNREACHABLE: "
"AfterGLXCall sErrorEvent" ")", "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 278); AnnotateMozCrashReason("MOZ_ASSERT" "(" "false" ") ("
"MOZ_ASSERT_UNREACHABLE: " "AfterGLXCall sErrorEvent" ")"); do
{ *((volatile int*)__null) = 278; __attribute__((nomerge)) ::
abort(); } while (false); } } while (false);
279 }
280 const auto was = XSetErrorHandler(sOldErrorHandler);
281 if (was != GLXErrorHandler) {
282 NS_WARNING("Concurrent XSetErrorHandlers")NS_DebugBreak(NS_DEBUG_WARNING, "Concurrent XSetErrorHandlers"
, nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 282);
283 }
284 }
285}
286
287// Returns the GTK display if available; otherwise, if a display was
288// previously opened by this method and is still open, returns a
289// reference to it; otherwise, opens a new connection. (The non-GTK
290// cases are similar to what we do for EGL.)
291std::shared_ptr<XlibDisplay> GLXLibrary::GetDisplay() {
292 std::shared_ptr<XlibDisplay> display;
293
294#ifdef MOZ_WIDGET_GTK1
295 static const bool kHaveGtk = !!gdk_display_get_default();
296 if (kHaveGtk) {
297 display = XlibDisplay::Borrow(DefaultXDisplay());
298 }
299#endif
300 if (display) {
301 return display;
302 }
303
304 auto ownDisplay = mOwnDisplay.Lock();
305 display = ownDisplay->lock();
306 if (display) {
307 return display;
308 }
309
310 display = XlibDisplay::Open(nullptr);
311 if (NS_WARN_IF(!display)NS_warn_if_impl(!display, "!display", "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 311)) {
312 return nullptr;
313 }
314 *ownDisplay = display;
315 return display;
316}
317
318already_AddRefed<GLContextGLX> GLContextGLX::CreateGLContext(
319 const GLContextDesc& desc, std::shared_ptr<XlibDisplay> display,
320 GLXDrawable drawable, GLXFBConfig cfg, Drawable ownedPixmap) {
321 GLXLibrary& glx = sGLXLibrary;
322
323 int isDoubleBuffered = 0;
324 int err = glx.fGetFBConfigAttrib(*display, cfg, LOCAL_GLX_DOUBLEBUFFER5,
325 &isDoubleBuffered);
326 if (LOCAL_GLX_BAD_ATTRIBUTE2 != err) {
9
←
Assuming 'err' is equal to LOCAL_GLX_BAD_ATTRIBUTE
→
10
←
Taking false branch
→
327 if (ShouldSpew()) {
328 printf("[GLX] FBConfig is %sdouble-buffered\n",
329 isDoubleBuffered ? "" : "not ");
330 }
331 }
332
333 if (!glx.HasCreateContextAttribs()) {
11
←
Assuming the condition is false
→
12
←
Taking false branch
→
334 NS_WARNING("Cannot create GLContextGLX without glxCreateContextAttribs")NS_DebugBreak(NS_DEBUG_WARNING, "Cannot create GLContextGLX without glxCreateContextAttribs"
, nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 334);
335 return nullptr;
336 }
337
338 // -
339
340 const auto CreateWithAttribs =
341 [&](const std::vector<int>& attribs) -> RefPtr<GLContextGLX> {
342 auto terminated = attribs;
343 terminated.push_back(0);
344
345 const auto glxContext = glx.fCreateContextAttribs(
21
←
Called C++ object pointer is uninitialized
346 *display, cfg, nullptr, X11True1, terminated.data());
347 if (!glxContext) return nullptr;
348 const RefPtr<GLContextGLX> ret = new GLContextGLX(
349 desc, display, drawable, glxContext, isDoubleBuffered, ownedPixmap);
350
351 if (!ret->Init()) return nullptr;
352
353 return ret;
354 };
355
356 // -
357
358 RefPtr<GLContextGLX> glContext;
359
360 std::vector<int> attribs;
361 attribs.insert(attribs.end(), {
362 LOCAL_GLX_RENDER_TYPE0x8011,
363 LOCAL_GLX_RGBA_TYPE0x8014,
364 });
365 if (glx.HasVideoMemoryPurge()) {
13
←
Assuming the condition is false
→
14
←
Taking false branch
→
366 attribs.insert(attribs.end(),
367 {
368 LOCAL_GLX_GENERATE_RESET_ON_VIDEO_MEMORY_PURGE_NV0x20F7,
369 LOCAL_GL_TRUE1,
370 });
371 }
372 const bool useCore =
373 !(desc.flags & CreateContextFlags::REQUIRE_COMPAT_PROFILE);
374 if (useCore
14.1
'useCore' is false
) {
15
←
Taking false branch
→
375 attribs.insert(attribs.end(), {
376 LOCAL_GLX_CONTEXT_MAJOR_VERSION_ARB0x2091,
377 3,
378 LOCAL_GLX_CONTEXT_MINOR_VERSION_ARB0x2092,
379 2,
380 LOCAL_GLX_CONTEXT_PROFILE_MASK_ARB0x9126,
381 LOCAL_GLX_CONTEXT_CORE_PROFILE_BIT_ARB0x00000001,
382 });
383 }
384
385 if (glx.HasRobustness()) {
16
←
Uninitialized value stored to 'glx'
→
17
←
Assuming the condition is false
→
18
←
Taking false branch
→
386 auto withRobustness = attribs;
387 withRobustness.insert(withRobustness.end(),
388 {
389 LOCAL_GLX_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB0x8256,
390 LOCAL_GLX_LOSE_CONTEXT_ON_RESET_ARB0x8252,
391 });
392
393 {
394 auto withRBAB = withRobustness;
395 withRBAB.insert(withRBAB.end(),
396 {
397 LOCAL_GLX_CONTEXT_FLAGS_ARB0x2094,
398 LOCAL_GLX_CONTEXT_ROBUST_ACCESS_BIT_ARB0x00000004,
399 });
400 if (!glContext) {
401 glContext = CreateWithAttribs(withRBAB);
402 if (!glContext) {
403 NS_WARNING("Failed to create+init GLContextGLX with RBAB")NS_DebugBreak(NS_DEBUG_WARNING, "Failed to create+init GLContextGLX with RBAB"
, nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 403);
404 }
405 }
406 }
407
408 if (!glContext) {
409 glContext = CreateWithAttribs(withRobustness);
410 if (!glContext) {
411 NS_WARNING("Failed to create+init GLContextGLX with Robustness")NS_DebugBreak(NS_DEBUG_WARNING, "Failed to create+init GLContextGLX with Robustness"
, nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 411);
412 }
413 }
414 }
415
416 if (!glContext) {
19
←
Taking true branch
→
417 glContext = CreateWithAttribs(attribs);
20
←
Calling 'operator()'
→
418 if (!glContext) {
419 NS_WARNING("Failed to create+init GLContextGLX with required attribs")NS_DebugBreak(NS_DEBUG_WARNING, "Failed to create+init GLContextGLX with required attribs"
, nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 419);
420 }
421 }
422
423 return glContext.forget();
424}
425
426GLContextGLX::~GLContextGLX() {
427 MarkDestroyed();
428
429 // Wrapped context should not destroy glxContext/Surface
430 if (!mOwnsContext) {
431 return;
432 }
433
434 // see bug 659842 comment 76
435 bool success = mGLX->fMakeCurrent(*mDisplay, X11None0L, nullptr);
436 if (!success) {
437 NS_WARNING(NS_DebugBreak(NS_DEBUG_WARNING, "glXMakeCurrent failed to release GL context before we call "
"glXDestroyContext!", nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 439)
438 "glXMakeCurrent failed to release GL context before we call "NS_DebugBreak(NS_DEBUG_WARNING, "glXMakeCurrent failed to release GL context before we call "
"glXDestroyContext!", nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 439)
439 "glXDestroyContext!")NS_DebugBreak(NS_DEBUG_WARNING, "glXMakeCurrent failed to release GL context before we call "
"glXDestroyContext!", nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 439);
440 }
441
442 mGLX->fDestroyContext(*mDisplay, mContext);
443
444 // If we own the enclosed X pixmap, then free it after we free the enclosing
445 // GLX pixmap.
446 if (mOwnedPixmap) {
447 mGLX->fDestroyPixmap(*mDisplay, mDrawable);
448 XFreePixmap(*mDisplay, mOwnedPixmap);
449 }
450}
451
452bool GLContextGLX::Init() {
453 if (!GLContext::Init()) {
454 return false;
455 }
456
457 // EXT_framebuffer_object is not supported on Core contexts
458 // so we'll also check for ARB_framebuffer_object
459 if (!IsExtensionSupported(EXT_framebuffer_object) &&
460 !IsSupported(GLFeature::framebuffer_object))
461 return false;
462
463 return true;
464}
465
466bool GLContextGLX::MakeCurrentImpl() const {
467 if (mGLX->IsMesa()) {
468 // Read into the event queue to ensure that Mesa receives a
469 // DRI2InvalidateBuffers event before drawing. See bug 1280653.
470 Unused << XPending(*mDisplay);
471 }
472
473 const bool succeeded = mGLX->fMakeCurrent(*mDisplay, mDrawable, mContext);
474 if (!succeeded) {
475 NS_WARNING("Failed to make GL context current!")NS_DebugBreak(NS_DEBUG_WARNING, "Failed to make GL context current!"
, nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 475);
476 }
477
478 if (!IsOffscreen() && mGLX->SupportsSwapControl()) {
479 // Many GLX implementations default to blocking until the next
480 // VBlank when calling glXSwapBuffers. We want to run unthrottled
481 // in ASAP mode. See bug 1280744.
482 const bool swapInterval = gfxVars::SwapIntervalGLX();
483 const bool isASAP = (StaticPrefs::layout_frame_rate() == 0);
484 const int interval = (swapInterval && !isASAP) ? 1 : 0;
485 mGLX->fSwapInterval(*mDisplay, mDrawable, interval);
486 }
487 return succeeded;
488}
489
490bool GLContextGLX::IsCurrentImpl() const {
491 return mGLX->fGetCurrentContext() == mContext;
492}
493
494Maybe<SymbolLoader> GLContextGLX::GetSymbolLoader() const {
495 const auto pfn = sGLXLibrary.GetGetProcAddress();
496 return Some(SymbolLoader(pfn));
497}
498
499bool GLContextGLX::IsDoubleBuffered() const { return mDoubleBuffered; }
500
501bool GLContextGLX::SwapBuffers() {
502 if (!mDoubleBuffered) return false;
503 mGLX->fSwapBuffers(*mDisplay, mDrawable);
504 return true;
505}
506
507GLint GLContextGLX::GetBufferAge() const {
508 if (!sGLXLibrary.SupportsBufferAge()) {
509 return 0;
510 }
511
512 GLuint result = 0;
513 mGLX->fQueryDrawable(*mDisplay, mDrawable, LOCAL_GLX_BACK_BUFFER_AGE_EXT0x20F4,
514 &result);
515 if (result > INT32_MAX(2147483647)) {
516 // If the result can't fit, just assume the buffer cannot be reused.
517 return 0;
518 }
519 return result;
520}
521
522void GLContextGLX::GetWSIInfo(nsCString* const out) const {
523 int screen = DefaultScreen(mDisplay->get())(((_XPrivDisplay)(mDisplay->get()))->default_screen);
524
525 int majorVersion, minorVersion;
526 sGLXLibrary.fQueryVersion(*mDisplay, &majorVersion, &minorVersion);
527
528 out->Append(nsPrintfCString("GLX %u.%u", majorVersion, minorVersion));
529
530 out->AppendLiteral("\nGLX_VENDOR(client): ");
531 out->Append(sGLXLibrary.fGetClientString(*mDisplay, LOCAL_GLX_VENDOR0x1));
532
533 out->AppendLiteral("\nGLX_VENDOR(server): ");
534 out->Append(
535 sGLXLibrary.fQueryServerString(*mDisplay, screen, LOCAL_GLX_VENDOR0x1));
536
537 out->AppendLiteral("\nExtensions: ");
538 out->Append(sGLXLibrary.fQueryExtensionsString(*mDisplay, screen));
539}
540
541bool GLContextGLX::OverrideDrawable(GLXDrawable drawable) {
542 return mGLX->fMakeCurrent(*mDisplay, drawable, mContext);
543}
544
545bool GLContextGLX::RestoreDrawable() {
546 return mGLX->fMakeCurrent(*mDisplay, mDrawable, mContext);
547}
548
549GLContextGLX::GLContextGLX(const GLContextDesc& desc,
550 std::shared_ptr<XlibDisplay> aDisplay,
551 GLXDrawable aDrawable, GLXContext aContext,
552 bool aDoubleBuffered, Drawable aOwnedPixmap)
553 : GLContext(desc, nullptr),
554 mContext(aContext),
555 mDisplay(aDisplay),
556 mDrawable(aDrawable),
557 mOwnedPixmap(aOwnedPixmap),
558 mDoubleBuffered(aDoubleBuffered),
559 mGLX(&sGLXLibrary) {}
560
561static bool AreCompatibleVisuals(Visual* one, Visual* two) {
562 if (one->c_class != two->c_class) {
563 return false;
564 }
565
566 if (one->red_mask != two->red_mask || one->green_mask != two->green_mask ||
567 one->blue_mask != two->blue_mask) {
568 return false;
569 }
570
571 if (one->bits_per_rgb != two->bits_per_rgb) {
572 return false;
573 }
574
575 return true;
576}
577
578already_AddRefed<GLContext> CreateForWidget(Display* aXDisplay, Window aXWindow,
579 bool aHardwareWebRender,
580 bool aForceAccelerated) {
581 if (!sGLXLibrary.EnsureInitialized(aXDisplay)) {
582 return nullptr;
583 }
584
585 // Currently, we take whatever Visual the window already has, and
586 // try to create an fbconfig for that visual. This isn't
587 // necessarily what we want in the long run; an fbconfig may not
588 // be available for the existing visual, or if it is, the GL
589 // performance might be suboptimal. But using the existing visual
590 // is a relatively safe intermediate step.
591
592 if (!aXDisplay) {
593 NS_ERROR("X Display required for GLX Context provider")do { NS_DebugBreak(NS_DEBUG_ASSERTION, "X Display required for GLX Context provider"
, "Error", "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 593); MOZ_PretendNoReturn(); } while (0);
594 return nullptr;
595 }
596
597 if (!aXWindow) {
598 NS_ERROR("X window required for GLX Context provider")do { NS_DebugBreak(NS_DEBUG_ASSERTION, "X window required for GLX Context provider"
, "Error", "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 598); MOZ_PretendNoReturn(); } while (0);
599 return nullptr;
600 }
601
602 int xscreen = DefaultScreen(aXDisplay)(((_XPrivDisplay)(aXDisplay))->default_screen);
603
604 GLXFBConfig config;
605 int visid;
606 if (!GLContextGLX::FindFBConfigForWindow(
607 aXDisplay, xscreen, aXWindow, &config, &visid, aHardwareWebRender)) {
608 return nullptr;
609 }
610
611 CreateContextFlags flags;
612 if (aHardwareWebRender) {
613 flags = CreateContextFlags::NONE; // WR needs GL3.2+
614 } else {
615 flags = CreateContextFlags::REQUIRE_COMPAT_PROFILE;
616 }
617 return GLContextGLX::CreateGLContext(
618 {{flags}, false}, XlibDisplay::Borrow(aXDisplay), aXWindow, config);
619}
620
621already_AddRefed<GLContext> GLContextProviderGLX::CreateForCompositorWidget(
622 CompositorWidget* aCompositorWidget, bool aHardwareWebRender,
623 bool aForceAccelerated) {
624 if (!aCompositorWidget) {
625 MOZ_ASSERT(false)do { static_assert( mozilla::detail::AssertionConditionType<
decltype(false)>::isValid, "invalid assertion condition");
if ((__builtin_expect(!!(!(!!(false))), 0))) { do { } while (
false); MOZ_ReportAssertionFailure("false", "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 625); AnnotateMozCrashReason("MOZ_ASSERT" "(" "false" ")");
do { *((volatile int*)__null) = 625; __attribute__((nomerge)
) ::abort(); } while (false); } } while (false);
626 return nullptr;
627 }
628 GtkCompositorWidget* compWidget = aCompositorWidget->AsGTK();
629 MOZ_ASSERT(compWidget)do { static_assert( mozilla::detail::AssertionConditionType<
decltype(compWidget)>::isValid, "invalid assertion condition"
); if ((__builtin_expect(!!(!(!!(compWidget))), 0))) { do { }
while (false); MOZ_ReportAssertionFailure("compWidget", "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 629); AnnotateMozCrashReason("MOZ_ASSERT" "(" "compWidget" ")"
); do { *((volatile int*)__null) = 629; __attribute__((nomerge
)) ::abort(); } while (false); } } while (false);
630
631 return CreateForWidget(DefaultXDisplay(), compWidget->XWindow(),
632 aHardwareWebRender, aForceAccelerated);
633}
634
635static bool ChooseConfig(GLXLibrary* glx, Display* display, int screen,
636 GLXFBConfig* const out_config, int* const out_visid) {
637 const int attribs[] = {
638 LOCAL_GLX_RENDER_TYPE0x8011,
639 LOCAL_GLX_RGBA_BIT0x00000001,
640 LOCAL_GLX_DRAWABLE_TYPE0x8010,
641 LOCAL_GLX_PIXMAP_BIT0x00000002,
642 LOCAL_GLX_X_RENDERABLE0x8012,
643 X11True1,
644 LOCAL_GLX_RED_SIZE8,
645 8,
646 LOCAL_GLX_GREEN_SIZE9,
647 8,
648 LOCAL_GLX_BLUE_SIZE10,
649 8,
650 LOCAL_GLX_ALPHA_SIZE11,
651 8,
652 LOCAL_GLX_DEPTH_SIZE12,
653 0,
654 LOCAL_GLX_STENCIL_SIZE13,
655 0,
656 0,
657 };
658
659 int numConfigs = 0;
660 const auto scopedConfigArr =
661 glx->fChooseFBConfig(display, screen, attribs, &numConfigs);
662 const auto freeConfigList = MakeScopeExit([&]() {
663 if (scopedConfigArr) {
664 XFree(scopedConfigArr);
665 }
666 });
667 if (!scopedConfigArr || !numConfigs) return false;
668
669 // Issues with glxChooseFBConfig selection and sorting:
670 // * ALPHA_SIZE is sorted as 'largest total RGBA bits first'. If we don't
671 // request
672 // alpha bits, we'll probably get RGBA anyways, since 32 is more than 24.
673 // * DEPTH_SIZE is sorted largest first, including for `0` inputs.
674 // * STENCIL_SIZE is smallest first, but it might return `8` even though we
675 // ask for
676 // `0`.
677
678 // For now, we don't care about these. We *will* care when we do XPixmap
679 // sharing.
680
681 for (int i = 0; i < numConfigs; ++i) {
682 GLXFBConfig curConfig = scopedConfigArr[i];
683
684 int visid;
685 if (glx->fGetFBConfigAttrib(display, curConfig, LOCAL_GLX_VISUAL_ID0x800B,
686 &visid) != Success0) {
687 continue;
688 }
689
690 if (!visid) continue;
691
692 *out_config = curConfig;
693 *out_visid = visid;
694 return true;
695 }
696
697 return false;
698}
699
700bool GLContextGLX::FindVisual(Display* display, int screen,
701 int* const out_visualId) {
702 if (!sGLXLibrary.EnsureInitialized(display)) {
703 return false;
704 }
705
706 XVisualInfo visualTemplate;
707 visualTemplate.screen = screen;
708
709 // Get all visuals of screen
710
711 int visualsLen = 0;
712 XVisualInfo* xVisuals =
713 XGetVisualInfo(display, VisualScreenMask0x2, &visualTemplate, &visualsLen);
714 if (!xVisuals) {
715 return false;
716 }
717 const Range<XVisualInfo> visualInfos(xVisuals, visualsLen);
718 auto cleanupVisuals = MakeScopeExit([&] { XFree(xVisuals); });
719
720 // Get default visual info
721
722 Visual* defaultVisual = DefaultVisual(display, screen)((&((_XPrivDisplay)(display))->screens[screen])->root_visual
);
723 const auto defaultVisualInfo = [&]() -> const XVisualInfo* {
724 for (const auto& cur : visualInfos) {
725 if (cur.visual == defaultVisual) {
726 return &cur;
727 }
728 }
729 return nullptr;
730 }();
731 if (!defaultVisualInfo) {
732 MOZ_ASSERT(false)do { static_assert( mozilla::detail::AssertionConditionType<
decltype(false)>::isValid, "invalid assertion condition");
if ((__builtin_expect(!!(!(!!(false))), 0))) { do { } while (
false); MOZ_ReportAssertionFailure("false", "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 732); AnnotateMozCrashReason("MOZ_ASSERT" "(" "false" ")");
do { *((volatile int*)__null) = 732; __attribute__((nomerge)
) ::abort(); } while (false); } } while (false);
733 return false;
734 }
735
736 const int bpp = 32;
737
738 for (auto& cur : visualInfos) {
739 const auto fnConfigMatches = [&](const int pname, const int expected) {
740 int actual;
741 if (sGLXLibrary.fGetConfig(display, &cur, pname, &actual)) {
742 return false;
743 }
744 return actual == expected;
745 };
746
747 // Check if visual is compatible.
748 if (cur.depth != bpp || cur.c_class != defaultVisualInfo->c_class) {
749 continue;
750 }
751
752 // Check if visual is compatible to GL requests.
753 if (fnConfigMatches(LOCAL_GLX_USE_GL1, 1) &&
754 fnConfigMatches(LOCAL_GLX_DOUBLEBUFFER5, 1) &&
755 fnConfigMatches(LOCAL_GLX_RED_SIZE8, 8) &&
756 fnConfigMatches(LOCAL_GLX_GREEN_SIZE9, 8) &&
757 fnConfigMatches(LOCAL_GLX_BLUE_SIZE10, 8) &&
758 fnConfigMatches(LOCAL_GLX_ALPHA_SIZE11, 8)) {
759 *out_visualId = cur.visualid;
760 return true;
761 }
762 }
763
764 return false;
765}
766
767bool GLContextGLX::FindFBConfigForWindow(Display* display, int screen,
768 Window window,
769 GLXFBConfig* const out_config,
770 int* const out_visid,
771 bool aWebRender) {
772 // XXX the visual ID is almost certainly the LOCAL_GLX_FBCONFIG_ID, so
773 // we could probably do this first and replace the glXGetFBConfigs
774 // with glXChooseConfigs. Docs are sparklingly clear as always.
775 XWindowAttributes windowAttrs;
776 if (!XGetWindowAttributes(display, window, &windowAttrs)) {
777 NS_WARNING("[GLX] XGetWindowAttributes() failed")NS_DebugBreak(NS_DEBUG_WARNING, "[GLX] XGetWindowAttributes() failed"
, nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 777);
778 return false;
779 }
780
781 GLXFBConfig* cfgs = nullptr;
782 const auto freeConfigList = MakeScopeExit([&]() {
783 if (cfgs) {
784 XFree(cfgs);
785 }
786 });
787 int numConfigs;
788 const int webrenderAttribs[] = {LOCAL_GLX_ALPHA_SIZE11,
789 windowAttrs.depth == 32 ? 8 : 0,
790 LOCAL_GLX_DOUBLEBUFFER5, X11True1, 0};
791
792 if (aWebRender) {
793 cfgs = sGLXLibrary.fChooseFBConfig(display, screen, webrenderAttribs,
794 &numConfigs);
795 } else {
796 cfgs = sGLXLibrary.fGetFBConfigs(display, screen, &numConfigs);
797 }
798
799 if (!cfgs) {
800 NS_WARNING("[GLX] glXGetFBConfigs() failed")NS_DebugBreak(NS_DEBUG_WARNING, "[GLX] glXGetFBConfigs() failed"
, nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 800);
801 return false;
802 }
803 NS_ASSERTION(numConfigs > 0, "No FBConfigs found!")do { if (!(numConfigs > 0)) { NS_DebugBreak(NS_DEBUG_ASSERTION
, "No FBConfigs found!", "numConfigs > 0", "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 803); MOZ_PretendNoReturn(); } } while (0);
804
805 const VisualID windowVisualID = XVisualIDFromVisual(windowAttrs.visual);
806#ifdef DEBUG1
807 printf("[GLX] window %lx has VisualID 0x%lx\n", window, windowVisualID);
808#endif
809
810 for (int i = 0; i < numConfigs; i++) {
811 int visid = X11None0L;
812 sGLXLibrary.fGetFBConfigAttrib(display, cfgs[i], LOCAL_GLX_VISUAL_ID0x800B,
813 &visid);
814 if (visid) {
815 // WebRender compatible GLX visual is configured
816 // at nsWindow::Create() by GLContextGLX::FindVisual(),
817 // just reuse it here.
818 if (windowVisualID == static_cast<VisualID>(visid)) {
819 *out_config = cfgs[i];
820 *out_visid = visid;
821 return true;
822 }
823 }
824 }
825
826 // We don't have a frame buffer visual which matches the GLX visual
827 // from GLContextGLX::FindVisual(). Let's try to find a near one and hope
828 // we're not on NVIDIA (Bug 1478454) as it causes X11 BadMatch error there.
829 for (int i = 0; i < numConfigs; i++) {
830 int visid = X11None0L;
831 sGLXLibrary.fGetFBConfigAttrib(display, cfgs[i], LOCAL_GLX_VISUAL_ID0x800B,
832 &visid);
833 if (visid) {
834 int depth;
835 Visual* visual;
836 FindVisualAndDepth(display, visid, &visual, &depth);
837 if (depth == windowAttrs.depth &&
838 AreCompatibleVisuals(windowAttrs.visual, visual)) {
839 *out_config = cfgs[i];
840 *out_visid = visid;
841 return true;
842 }
843 }
844 }
845
846 NS_WARNING("[GLX] Couldn't find a FBConfig matching window visual")NS_DebugBreak(NS_DEBUG_WARNING, "[GLX] Couldn't find a FBConfig matching window visual"
, nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 846);
847 return false;
848}
849
850static already_AddRefed<GLContextGLX> CreateOffscreenPixmapContext(
851 const GLContextCreateDesc& desc, const IntSize& size,
852 nsACString* const out_failureId) {
853 GLXLibrary* glx = &sGLXLibrary;
854 auto display = glx->GetDisplay();
855
856 if (!display || !glx->EnsureInitialized(*display)) return nullptr;
2
←
Taking false branch
→
857
858 int screen = DefaultScreen(display->get())(((_XPrivDisplay)(display->get()))->default_screen);
859
860 GLXFBConfig config;
861 int visid;
862 if (!ChooseConfig(glx, *display, screen, &config, &visid)) {
3
←
Taking false branch
→
863 NS_WARNING("Failed to find a compatible config.")NS_DebugBreak(NS_DEBUG_WARNING, "Failed to find a compatible config."
, nullptr, "/var/lib/jenkins/workspace/firefox-scan-build/gfx/gl/GLContextProviderGLX.cpp"
, 863);
864 return nullptr;
865 }
866
867 Visual* visual;
868 int depth;
869 FindVisualAndDepth(*display, visid, &visual, &depth);
870
871 gfx::IntSize dummySize(16, 16);
872 const auto drawable =
873 XCreatePixmap(*display, DefaultRootWindow(display->get())((&((_XPrivDisplay)(display->get()))->screens[(((_XPrivDisplay
)(display->get()))->default_screen)])->root),
874 dummySize.width, dummySize.height, depth);
875 if (!drawable) {
4
←
Assuming 'drawable' is not equal to 0
→
5
←
Taking false branch
→
876 return nullptr;
877 }
878
879 // Handle slightly different signature between glXCreatePixmap and
880 // its pre-GLX-1.3 extension equivalent (though given the ABI, we
881 // might not need to).
882 const auto pixmap = glx->fCreatePixmap(*display, config, drawable, nullptr);
883 if (pixmap == 0) {
6
←
Assuming 'pixmap' is not equal to 0
→
7
←
Taking false branch
→
884 XFreePixmap(*display, drawable);
885 return nullptr;
886 }
887
888 auto fullDesc = GLContextDesc{desc};
889 fullDesc.isOffscreen = true;
890
891 return GLContextGLX::CreateGLContext(fullDesc, display, pixmap, config,
8
←
Calling 'GLContextGLX::CreateGLContext'
→
892 drawable);
893}
894
895/*static*/
896already_AddRefed<GLContext> GLContextProviderGLX::CreateHeadless(
897 const GLContextCreateDesc& desc, nsACString* const out_failureId) {
898 IntSize dummySize = IntSize(16, 16);
899 return CreateOffscreenPixmapContext(desc, dummySize, out_failureId);
1
Calling 'CreateOffscreenPixmapContext'
→
900}
901
902/*static*/
903GLContext* GLContextProviderGLX::GetGlobalContext() {
904 // Context sharing not supported.
905 return nullptr;
906}
907
908/*static*/
909void GLContextProviderGLX::Shutdown() {}
910
911} // namespace mozilla::gl