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gecko-dev/gfx/thebes/gfxPlatformGtk.cpp

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26 KiB
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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* 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/. */
#define PANGO_ENABLE_BACKEND
#define PANGO_ENABLE_ENGINE
#include "gfxPlatformGtk.h"
#include "prenv.h"
#include "nsUnicharUtils.h"
#include "nsUnicodeProperties.h"
#include "gfx2DGlue.h"
#include "gfxFcPlatformFontList.h"
#include "gfxFontconfigUtils.h"
#include "gfxFontconfigFonts.h"
#include "gfxConfig.h"
#include "gfxContext.h"
#include "gfxUserFontSet.h"
#include "gfxUtils.h"
#include "gfxFT2FontBase.h"
#include "gfxPrefs.h"
#include "VsyncSource.h"
#include "mozilla/Atomics.h"
#include "mozilla/Monitor.h"
#include "base/task.h"
#include "base/thread.h"
#include "base/message_loop.h"
#include "mozilla/gfx/Logging.h"
#include "mozilla/gfx/2D.h"
#include "cairo.h"
#include <gtk/gtk.h>
#include "gfxImageSurface.h"
#ifdef MOZ_X11
#include <gdk/gdkx.h>
#include "gfxXlibSurface.h"
#include "cairo-xlib.h"
#include "mozilla/Preferences.h"
#include "mozilla/X11Util.h"
#ifdef GL_PROVIDER_GLX
#include "GLContextProvider.h"
#include "GLContextGLX.h"
#include "GLXLibrary.h"
#endif
/* Undefine the Status from Xlib since it will conflict with system headers on OSX */
#if defined(__APPLE__) && defined(Status)
#undef Status
#endif
#endif /* MOZ_X11 */
#include <fontconfig/fontconfig.h>
#include "nsMathUtils.h"
#define GDK_PIXMAP_SIZE_MAX 32767
#define GFX_PREF_MAX_GENERIC_SUBSTITUTIONS "gfx.font_rendering.fontconfig.max_generic_substitutions"
using namespace mozilla;
using namespace mozilla::gfx;
using namespace mozilla::unicode;
#if (MOZ_WIDGET_GTK == 2)
static cairo_user_data_key_t cairo_gdk_drawable_key;
#endif
gfxPlatformGtk::gfxPlatformGtk()
{
if (!gfxPlatform::IsHeadless()) {
gtk_init(nullptr, nullptr);
}
mMaxGenericSubstitutions = UNINITIALIZED_VALUE;
#ifdef MOZ_X11
if (!gfxPlatform::IsHeadless() && XRE_IsParentProcess()) {
if (GDK_IS_X11_DISPLAY(gdk_display_get_default()) &&
mozilla::Preferences::GetBool("gfx.xrender.enabled"))
{
gfxVars::SetUseXRender(true);
}
}
#endif
uint32_t canvasMask = BackendTypeBit(BackendType::CAIRO);
uint32_t contentMask = BackendTypeBit(BackendType::CAIRO);
#ifdef USE_SKIA
canvasMask |= BackendTypeBit(BackendType::SKIA);
contentMask |= BackendTypeBit(BackendType::SKIA);
#endif
InitBackendPrefs(canvasMask, BackendType::CAIRO,
contentMask, BackendType::CAIRO);
#ifdef MOZ_X11
if (gfxPlatform::IsHeadless() && GDK_IS_X11_DISPLAY(gdk_display_get_default())) {
mCompositorDisplay = XOpenDisplay(nullptr);
MOZ_ASSERT(mCompositorDisplay, "Failed to create compositor display!");
} else {
mCompositorDisplay = nullptr;
}
#endif // MOZ_X11
}
gfxPlatformGtk::~gfxPlatformGtk()
{
#ifdef MOZ_X11
if (mCompositorDisplay) {
XCloseDisplay(mCompositorDisplay);
}
#endif // MOZ_X11
}
void
gfxPlatformGtk::FlushContentDrawing()
{
if (gfxVars::UseXRender()) {
XFlush(DefaultXDisplay());
}
}
already_AddRefed<gfxASurface>
gfxPlatformGtk::CreateOffscreenSurface(const IntSize& aSize,
gfxImageFormat aFormat)
{
if (!Factory::AllowedSurfaceSize(aSize)) {
return nullptr;
}
RefPtr<gfxASurface> newSurface;
bool needsClear = true;
#ifdef MOZ_X11
// XXX we really need a different interface here, something that passes
// in more context, including the display and/or target surface type that
// we should try to match
GdkScreen *gdkScreen = gdk_screen_get_default();
if (gdkScreen) {
// When forcing PaintedLayers to use image surfaces for content,
// force creation of gfxImageSurface surfaces.
if (gfxVars::UseXRender() && !UseImageOffscreenSurfaces()) {
Screen *screen = gdk_x11_screen_get_xscreen(gdkScreen);
XRenderPictFormat* xrenderFormat =
gfxXlibSurface::FindRenderFormat(DisplayOfScreen(screen),
aFormat);
if (xrenderFormat) {
newSurface = gfxXlibSurface::Create(screen, xrenderFormat,
aSize);
}
} else {
// We're not going to use XRender, so we don't need to
// search for a render format
newSurface = new gfxImageSurface(aSize, aFormat);
// The gfxImageSurface ctor zeroes this for us, no need to
// waste time clearing again
needsClear = false;
}
}
#endif
if (!newSurface) {
// We couldn't create a native surface for whatever reason;
// e.g., no display, no RENDER, bad size, etc.
// Fall back to image surface for the data.
newSurface = new gfxImageSurface(aSize, aFormat);
}
if (newSurface->CairoStatus()) {
newSurface = nullptr; // surface isn't valid for some reason
}
if (newSurface && needsClear) {
gfxUtils::ClearThebesSurface(newSurface);
}
return newSurface.forget();
}
nsresult
gfxPlatformGtk::GetFontList(nsIAtom *aLangGroup,
const nsACString& aGenericFamily,
nsTArray<nsString>& aListOfFonts)
{
gfxPlatformFontList::PlatformFontList()->GetFontList(aLangGroup,
aGenericFamily,
aListOfFonts);
return NS_OK;
}
nsresult
gfxPlatformGtk::UpdateFontList()
{
gfxPlatformFontList::PlatformFontList()->UpdateFontList();
return NS_OK;
}
// xxx - this is ubuntu centric, need to go through other distros and flesh
// out a more general list
static const char kFontDejaVuSans[] = "DejaVu Sans";
static const char kFontDejaVuSerif[] = "DejaVu Serif";
static const char kFontEmojiOneMozilla[] = "EmojiOne Mozilla";
static const char kFontFreeSans[] = "FreeSans";
static const char kFontFreeSerif[] = "FreeSerif";
static const char kFontTakaoPGothic[] = "TakaoPGothic";
static const char kFontDroidSansFallback[] = "Droid Sans Fallback";
static const char kFontWenQuanYiMicroHei[] = "WenQuanYi Micro Hei";
static const char kFontNanumGothic[] = "NanumGothic";
void
gfxPlatformGtk::GetCommonFallbackFonts(uint32_t aCh, uint32_t aNextCh,
Script aRunScript,
nsTArray<const char*>& aFontList)
{
if (aNextCh == 0xfe0fu) {
// if char is followed by VS16, try for a color emoji glyph
aFontList.AppendElement(kFontEmojiOneMozilla);
}
aFontList.AppendElement(kFontDejaVuSerif);
aFontList.AppendElement(kFontFreeSerif);
aFontList.AppendElement(kFontDejaVuSans);
aFontList.AppendElement(kFontFreeSans);
if (!IS_IN_BMP(aCh)) {
uint32_t p = aCh >> 16;
if (p == 1) { // try color emoji font, unless VS15 (text style) present
if (aNextCh != 0xfe0fu && aNextCh != 0xfe0eu) {
aFontList.AppendElement(kFontEmojiOneMozilla);
}
}
}
// add fonts for CJK ranges
// xxx - this isn't really correct, should use the same CJK font ordering
// as the pref font code
if (aCh >= 0x3000 &&
((aCh < 0xe000) ||
(aCh >= 0xf900 && aCh < 0xfff0) ||
((aCh >> 16) == 2))) {
aFontList.AppendElement(kFontTakaoPGothic);
aFontList.AppendElement(kFontDroidSansFallback);
aFontList.AppendElement(kFontWenQuanYiMicroHei);
aFontList.AppendElement(kFontNanumGothic);
}
}
gfxPlatformFontList*
gfxPlatformGtk::CreatePlatformFontList()
{
gfxPlatformFontList* list = new gfxFcPlatformFontList();
if (NS_SUCCEEDED(list->InitFontList())) {
return list;
}
gfxPlatformFontList::Shutdown();
return nullptr;
}
nsresult
gfxPlatformGtk::GetStandardFamilyName(const nsAString& aFontName, nsAString& aFamilyName)
{
gfxPlatformFontList::PlatformFontList()->
GetStandardFamilyName(aFontName, aFamilyName);
return NS_OK;
}
gfxFontGroup *
gfxPlatformGtk::CreateFontGroup(const FontFamilyList& aFontFamilyList,
const gfxFontStyle* aStyle,
gfxTextPerfMetrics* aTextPerf,
gfxUserFontSet* aUserFontSet,
gfxFloat aDevToCssSize)
{
return new gfxFontGroup(aFontFamilyList, aStyle, aTextPerf,
aUserFontSet, aDevToCssSize);
}
gfxFontEntry*
gfxPlatformGtk::LookupLocalFont(const nsAString& aFontName,
uint16_t aWeight,
int16_t aStretch,
uint8_t aStyle)
{
gfxPlatformFontList* pfl = gfxPlatformFontList::PlatformFontList();
return pfl->LookupLocalFont(aFontName, aWeight, aStretch,
aStyle);
}
gfxFontEntry*
gfxPlatformGtk::MakePlatformFont(const nsAString& aFontName,
uint16_t aWeight,
int16_t aStretch,
uint8_t aStyle,
const uint8_t* aFontData,
uint32_t aLength)
{
gfxPlatformFontList* pfl = gfxPlatformFontList::PlatformFontList();
return pfl->MakePlatformFont(aFontName, aWeight, aStretch,
aStyle, aFontData, aLength);
}
FT_Library
gfxPlatformGtk::GetFTLibrary()
{
return gfxFcPlatformFontList::GetFTLibrary();
}
bool
gfxPlatformGtk::IsFontFormatSupported(nsIURI *aFontURI, uint32_t aFormatFlags)
{
// check for strange format flags
NS_ASSERTION(!(aFormatFlags & gfxUserFontSet::FLAG_FORMAT_NOT_USED),
"strange font format hint set");
// accept supported formats
// Pango doesn't apply features from AAT TrueType extensions.
// Assume that if this is the only SFNT format specified,
// then AAT extensions are required for complex script support.
if (aFormatFlags & gfxUserFontSet::FLAG_FORMATS_COMMON) {
return true;
}
// reject all other formats, known and unknown
if (aFormatFlags != 0) {
return false;
}
// no format hint set, need to look at data
return true;
}
static int32_t sDPI = 0;
int32_t
gfxPlatformGtk::GetDPI()
{
if (!sDPI) {
// Make sure init is run so we have a resolution
GdkScreen *screen = gdk_screen_get_default();
gtk_settings_get_for_screen(screen);
sDPI = int32_t(round(gdk_screen_get_resolution(screen)));
if (sDPI <= 0) {
// Fall back to something sane
sDPI = 96;
}
}
return sDPI;
}
double
gfxPlatformGtk::GetDPIScale()
{
// Integer scale factors work well with GTK window scaling, image scaling,
// and pixel alignment, but there is a range where 1 is too small and 2 is
// too big. An additional step of 1.5 is added because this is common
// scale on WINNT and at this ratio the advantages of larger rendering
// outweigh the disadvantages from scaling and pixel mis-alignment.
int32_t dpi = GetDPI();
if (dpi < 132) {
return 1.0;
}
if (dpi < 168) {
return 1.5;
}
return round(dpi/96.0);
}
bool
gfxPlatformGtk::UseImageOffscreenSurfaces()
{
return GetDefaultContentBackend() != mozilla::gfx::BackendType::CAIRO ||
gfxPrefs::UseImageOffscreenSurfaces();
}
gfxImageFormat
gfxPlatformGtk::GetOffscreenFormat()
{
// Make sure there is a screen
GdkScreen *screen = gdk_screen_get_default();
if (screen && gdk_visual_get_depth(gdk_visual_get_system()) == 16) {
return SurfaceFormat::R5G6B5_UINT16;
}
return SurfaceFormat::X8R8G8B8_UINT32;
}
void gfxPlatformGtk::FontsPrefsChanged(const char *aPref)
{
// only checking for generic substitions, pass other changes up
if (strcmp(GFX_PREF_MAX_GENERIC_SUBSTITUTIONS, aPref)) {
gfxPlatform::FontsPrefsChanged(aPref);
return;
}
mMaxGenericSubstitutions = UNINITIALIZED_VALUE;
gfxFcPlatformFontList* pfl = gfxFcPlatformFontList::PlatformFontList();
pfl->ClearGenericMappings();
FlushFontAndWordCaches();
}
uint32_t gfxPlatformGtk::MaxGenericSubstitions()
{
if (mMaxGenericSubstitutions == UNINITIALIZED_VALUE) {
mMaxGenericSubstitutions =
Preferences::GetInt(GFX_PREF_MAX_GENERIC_SUBSTITUTIONS, 3);
if (mMaxGenericSubstitutions < 0) {
mMaxGenericSubstitutions = 3;
}
}
return uint32_t(mMaxGenericSubstitutions);
}
void
gfxPlatformGtk::GetPlatformCMSOutputProfile(void *&mem, size_t &size)
{
mem = nullptr;
size = 0;
#ifdef MOZ_X11
GdkDisplay *display = gdk_display_get_default();
if (!GDK_IS_X11_DISPLAY(display))
return;
const char EDID1_ATOM_NAME[] = "XFree86_DDC_EDID1_RAWDATA";
const char ICC_PROFILE_ATOM_NAME[] = "_ICC_PROFILE";
Atom edidAtom, iccAtom;
Display *dpy = GDK_DISPLAY_XDISPLAY(display);
// In xpcshell tests, we never initialize X and hence don't have a Display.
// In this case, there's no output colour management to be done, so we just
// return with nullptr.
if (!dpy)
return;
Window root = gdk_x11_get_default_root_xwindow();
Atom retAtom;
int retFormat;
unsigned long retLength, retAfter;
unsigned char *retProperty ;
iccAtom = XInternAtom(dpy, ICC_PROFILE_ATOM_NAME, TRUE);
if (iccAtom) {
// read once to get size, once for the data
if (Success == XGetWindowProperty(dpy, root, iccAtom,
0, INT_MAX /* length */,
False, AnyPropertyType,
&retAtom, &retFormat, &retLength,
&retAfter, &retProperty)) {
if (retLength > 0) {
void *buffer = malloc(retLength);
if (buffer) {
memcpy(buffer, retProperty, retLength);
mem = buffer;
size = retLength;
}
}
XFree(retProperty);
if (size > 0) {
#ifdef DEBUG_tor
fprintf(stderr,
"ICM profile read from %s successfully\n",
ICC_PROFILE_ATOM_NAME);
#endif
return;
}
}
}
edidAtom = XInternAtom(dpy, EDID1_ATOM_NAME, TRUE);
if (edidAtom) {
if (Success == XGetWindowProperty(dpy, root, edidAtom, 0, 32,
False, AnyPropertyType,
&retAtom, &retFormat, &retLength,
&retAfter, &retProperty)) {
double gamma;
qcms_CIE_xyY whitePoint;
qcms_CIE_xyYTRIPLE primaries;
if (retLength != 128) {
#ifdef DEBUG_tor
fprintf(stderr, "Short EDID data\n");
#endif
return;
}
// Format documented in "VESA E-EDID Implementation Guide"
gamma = (100 + retProperty[0x17]) / 100.0;
whitePoint.x = ((retProperty[0x21] << 2) |
(retProperty[0x1a] >> 2 & 3)) / 1024.0;
whitePoint.y = ((retProperty[0x22] << 2) |
(retProperty[0x1a] >> 0 & 3)) / 1024.0;
whitePoint.Y = 1.0;
primaries.red.x = ((retProperty[0x1b] << 2) |
(retProperty[0x19] >> 6 & 3)) / 1024.0;
primaries.red.y = ((retProperty[0x1c] << 2) |
(retProperty[0x19] >> 4 & 3)) / 1024.0;
primaries.red.Y = 1.0;
primaries.green.x = ((retProperty[0x1d] << 2) |
(retProperty[0x19] >> 2 & 3)) / 1024.0;
primaries.green.y = ((retProperty[0x1e] << 2) |
(retProperty[0x19] >> 0 & 3)) / 1024.0;
primaries.green.Y = 1.0;
primaries.blue.x = ((retProperty[0x1f] << 2) |
(retProperty[0x1a] >> 6 & 3)) / 1024.0;
primaries.blue.y = ((retProperty[0x20] << 2) |
(retProperty[0x1a] >> 4 & 3)) / 1024.0;
primaries.blue.Y = 1.0;
XFree(retProperty);
#ifdef DEBUG_tor
fprintf(stderr, "EDID gamma: %f\n", gamma);
fprintf(stderr, "EDID whitepoint: %f %f %f\n",
whitePoint.x, whitePoint.y, whitePoint.Y);
fprintf(stderr, "EDID primaries: [%f %f %f] [%f %f %f] [%f %f %f]\n",
primaries.Red.x, primaries.Red.y, primaries.Red.Y,
primaries.Green.x, primaries.Green.y, primaries.Green.Y,
primaries.Blue.x, primaries.Blue.y, primaries.Blue.Y);
#endif
qcms_data_create_rgb_with_gamma(whitePoint, primaries, gamma, &mem, &size);
#ifdef DEBUG_tor
if (size > 0) {
fprintf(stderr,
"ICM profile read from %s successfully\n",
EDID1_ATOM_NAME);
}
#endif
}
}
#endif
}
#if (MOZ_WIDGET_GTK == 2)
void
gfxPlatformGtk::SetGdkDrawable(cairo_surface_t *target,
GdkDrawable *drawable)
{
if (cairo_surface_status(target))
return;
g_object_ref(drawable);
cairo_surface_set_user_data (target,
&cairo_gdk_drawable_key,
drawable,
g_object_unref);
}
GdkDrawable *
gfxPlatformGtk::GetGdkDrawable(cairo_surface_t *target)
{
if (cairo_surface_status(target))
return nullptr;
GdkDrawable *result;
result = (GdkDrawable*) cairo_surface_get_user_data (target,
&cairo_gdk_drawable_key);
if (result)
return result;
#ifdef MOZ_X11
if (cairo_surface_get_type(target) != CAIRO_SURFACE_TYPE_XLIB)
return nullptr;
// try looking it up in gdk's table
result = (GdkDrawable*) gdk_xid_table_lookup(cairo_xlib_surface_get_drawable(target));
if (result) {
SetGdkDrawable(target, result);
return result;
}
#endif
return nullptr;
}
#endif
already_AddRefed<ScaledFont>
gfxPlatformGtk::GetScaledFontForFont(DrawTarget* aTarget, gfxFont *aFont)
{
switch (aTarget->GetBackendType()) {
case BackendType::CAIRO:
case BackendType::SKIA:
if (aFont->GetType() == gfxFont::FONT_TYPE_FONTCONFIG) {
gfxFontconfigFontBase* fcFont = static_cast<gfxFontconfigFontBase*>(aFont);
return Factory::CreateScaledFontForFontconfigFont(
fcFont->GetCairoScaledFont(),
fcFont->GetPattern(),
fcFont->GetUnscaledFont(),
fcFont->GetAdjustedSize());
}
MOZ_FALLTHROUGH;
default:
return GetScaledFontForFontWithCairoSkia(aTarget, aFont);
}
}
#ifdef GL_PROVIDER_GLX
class GLXVsyncSource final : public VsyncSource
{
public:
GLXVsyncSource()
{
MOZ_ASSERT(NS_IsMainThread());
mGlobalDisplay = new GLXDisplay();
}
virtual ~GLXVsyncSource()
{
MOZ_ASSERT(NS_IsMainThread());
}
virtual Display& GetGlobalDisplay() override
{
return *mGlobalDisplay;
}
class GLXDisplay final : public VsyncSource::Display
{
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(GLXDisplay)
public:
GLXDisplay() : mGLContext(nullptr)
, mXDisplay(nullptr)
, mSetupLock("GLXVsyncSetupLock")
, mVsyncThread("GLXVsyncThread")
, mVsyncTask(nullptr)
, mVsyncEnabledLock("GLXVsyncEnabledLock")
, mVsyncEnabled(false)
{
}
// Sets up the display's GL context on a worker thread.
// Required as GLContexts may only be used by the creating thread.
// Returns true if setup was a success.
bool Setup()
{
MonitorAutoLock lock(mSetupLock);
MOZ_ASSERT(NS_IsMainThread());
if (!mVsyncThread.Start())
return false;
RefPtr<Runnable> vsyncSetup = NewRunnableMethod(this, &GLXDisplay::SetupGLContext);
mVsyncThread.message_loop()->PostTask(vsyncSetup.forget());
// Wait until the setup has completed.
lock.Wait();
return mGLContext != nullptr;
}
// Called on the Vsync thread to setup the GL context.
void SetupGLContext()
{
MonitorAutoLock lock(mSetupLock);
MOZ_ASSERT(!NS_IsMainThread());
MOZ_ASSERT(!mGLContext, "GLContext already setup!");
// Create video sync timer on a separate Display to prevent locking the
// main thread X display.
mXDisplay = XOpenDisplay(nullptr);
if (!mXDisplay) {
lock.NotifyAll();
return;
}
// Most compositors wait for vsync events on the root window.
Window root = DefaultRootWindow(mXDisplay);
int screen = DefaultScreen(mXDisplay);
ScopedXFree<GLXFBConfig> cfgs;
GLXFBConfig config;
int visid;
bool forWebRender = false;
if (!gl::GLContextGLX::FindFBConfigForWindow(mXDisplay, screen, root,
&cfgs, &config, &visid,
forWebRender)) {
lock.NotifyAll();
return;
}
mGLContext = gl::GLContextGLX::CreateGLContext(gl::CreateContextFlags::NONE,
gl::SurfaceCaps::Any(), false,
mXDisplay, root, config, false,
nullptr);
if (!mGLContext) {
lock.NotifyAll();
return;
}
mGLContext->MakeCurrent();
// Test that SGI_video_sync lets us get the counter.
unsigned int syncCounter = 0;
if (gl::sGLXLibrary.fGetVideoSync(&syncCounter) != 0) {
mGLContext = nullptr;
}
lock.NotifyAll();
}
virtual void EnableVsync() override
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(mGLContext, "GLContext not setup!");
MonitorAutoLock lock(mVsyncEnabledLock);
if (mVsyncEnabled) {
return;
}
mVsyncEnabled = true;
// If the task has not nulled itself out, it hasn't yet realized
// that vsync was disabled earlier, so continue its execution.
if (!mVsyncTask) {
mVsyncTask = NewRunnableMethod(this, &GLXDisplay::RunVsync);
RefPtr<Runnable> addrefedTask = mVsyncTask;
mVsyncThread.message_loop()->PostTask(addrefedTask.forget());
}
}
virtual void DisableVsync() override
{
MonitorAutoLock lock(mVsyncEnabledLock);
mVsyncEnabled = false;
}
virtual bool IsVsyncEnabled() override
{
MonitorAutoLock lock(mVsyncEnabledLock);
return mVsyncEnabled;
}
virtual void Shutdown() override
{
MOZ_ASSERT(NS_IsMainThread());
DisableVsync();
// Cleanup thread-specific resources before shutting down.
RefPtr<Runnable> shutdownTask = NewRunnableMethod(this, &GLXDisplay::Cleanup);
mVsyncThread.message_loop()->PostTask(shutdownTask.forget());
// Stop, waiting for the cleanup task to finish execution.
mVsyncThread.Stop();
}
private:
virtual ~GLXDisplay()
{
}
void RunVsync()
{
MOZ_ASSERT(!NS_IsMainThread());
mGLContext->MakeCurrent();
unsigned int syncCounter = 0;
gl::sGLXLibrary.fGetVideoSync(&syncCounter);
for (;;) {
{
MonitorAutoLock lock(mVsyncEnabledLock);
if (!mVsyncEnabled) {
mVsyncTask = nullptr;
return;
}
}
TimeStamp lastVsync = TimeStamp::Now();
bool useSoftware = false;
// Wait until the video sync counter reaches the next value by waiting
// until the parity of the counter value changes.
unsigned int nextSync = syncCounter + 1;
int status;
if ((status = gl::sGLXLibrary.fWaitVideoSync(2, nextSync % 2, &syncCounter)) != 0) {
gfxWarningOnce() << "glXWaitVideoSync returned " << status;
useSoftware = true;
}
if (syncCounter == (nextSync - 1)) {
gfxWarningOnce() << "glXWaitVideoSync failed to increment the sync counter.";
useSoftware = true;
}
if (useSoftware) {
double remaining = (1000.f / 60.f) -
(TimeStamp::Now() - lastVsync).ToMilliseconds();
if (remaining > 0) {
PlatformThread::Sleep(remaining);
}
}
lastVsync = TimeStamp::Now();
NotifyVsync(lastVsync);
}
}
void Cleanup() {
MOZ_ASSERT(!NS_IsMainThread());
mGLContext = nullptr;
XCloseDisplay(mXDisplay);
}
// Owned by the vsync thread.
RefPtr<gl::GLContextGLX> mGLContext;
_XDisplay* mXDisplay;
Monitor mSetupLock;
base::Thread mVsyncThread;
RefPtr<Runnable> mVsyncTask;
Monitor mVsyncEnabledLock;
bool mVsyncEnabled;
};
private:
// We need a refcounted VsyncSource::Display to use chromium IPC runnables.
RefPtr<GLXDisplay> mGlobalDisplay;
};
already_AddRefed<gfx::VsyncSource>
gfxPlatformGtk::CreateHardwareVsyncSource()
{
// Only use GLX vsync when the OpenGL compositor is being used.
// The extra cost of initializing a GLX context while blocking the main
// thread is not worth it when using basic composition.
if (gfxConfig::IsEnabled(Feature::HW_COMPOSITING)) {
if (gl::sGLXLibrary.SupportsVideoSync()) {
RefPtr<VsyncSource> vsyncSource = new GLXVsyncSource();
VsyncSource::Display& display = vsyncSource->GetGlobalDisplay();
if (!static_cast<GLXVsyncSource::GLXDisplay&>(display).Setup()) {
NS_WARNING("Failed to setup GLContext, falling back to software vsync.");
return gfxPlatform::CreateHardwareVsyncSource();
}
return vsyncSource.forget();
}
NS_WARNING("SGI_video_sync unsupported. Falling back to software vsync.");
}
return gfxPlatform::CreateHardwareVsyncSource();
}
#endif
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