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even more linux details, qt6 variant, gtk-free usage
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Signed-off-by: falkTX <[email protected]>
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@falkTX
falkTX committed Mar 15, 2024
1 parent 1d873a6 commit 34c6858
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Showing 2 changed files with 225 additions and 77 deletions.
5 changes: 2 additions & 3 deletions src/plugin/Makefile
View file
Original file line number Diff line number Diff line change
Expand Up @@ -34,7 +34,6 @@ DPF_TARGET_DIR = ../../build-plugin
include ../DPF/Makefile.plugins.mk

BUILD_CXX_FLAGS += -DVERSION='"$(shell cat ../../VERSION)"'
# BUILD_CXX_FLAGS += -std=gnu++17

BUILD_CXX_FLAGS += -pthread
LINK_FLAGS += -pthread
Expand All @@ -56,9 +55,9 @@ ifeq ($(LINUX),true)
TARGETS += $(TARGET_DIR)/MOD-Desktop-WebView

$(TARGET_DIR)/MOD-Desktop-WebView: $(BUILD_DIR)/WebViewQt.cpp.o
$(CXX) $^ $(LINK_FLAGS) $(shell $(PKG_CONFIG) --libs Qt5WebEngineWidgets x11) -o $@
$(CXX) $^ $(LINK_FLAGS) $(shell $(PKG_CONFIG) --libs x11) -o $@

$(BUILD_DIR)/WebViewQt.cpp.o: BUILD_CXX_FLAGS += -std=gnu++14 $(shell $(PKG_CONFIG) --cflags Qt5WebEngineWidgets webkit2gtk-4.0 x11)
$(BUILD_DIR)/WebViewQt.cpp.o: BUILD_CXX_FLAGS += -std=gnu++14 $(shell $(PKG_CONFIG) --cflags Qt5Widgets x11)

-include $(BUILD_DIR)/WebViewQt.cpp.d

Expand Down
297 changes: 223 additions & 74 deletions src/plugin/WebViewQt.cpp
View file
Original file line number Diff line number Diff line change
Expand Up @@ -3,63 +3,93 @@

// TODO split build

#include <QtGui/QWindow>
#include <QtWidgets/QApplication>
#include <QtWebEngineWidgets/QWebEngineView>
#include <QtCore/QChar>
#include <QtCore/QPoint>
#include <QtCore/QSize>

#undef signals

#include <gtk/gtkx.h>
#include <webkit2/webkit2.h>

#include <clocale>
#include <cstdio>
#include <dlfcn.h>
#include <new>
#include <X11/Xlib.h>

#include "DistrhoPluginInfo.h"
#include "DistrhoUtils.hpp"

// #include "../systray/qrc_mod-desktop.hpp"
// #include "../systray/utils.cpp"
struct GtkContainer;
struct GtkPlug;
struct GtkWidget;
struct GtkWindow;
struct WebKitSettings;
struct WebKitWebView;

#define GTK_CONTAINER(p) reinterpret_cast<GtkContainer*>(p)
#define GTK_PLUG(p) reinterpret_cast<GtkPlug*>(p)
#define GTK_WINDOW(p) reinterpret_cast<GtkWindow*>(p)
#define WEBKIT_WEB_VIEW(p) reinterpret_cast<WebKitWebView*>(p)

struct QApplication;
struct QUrl;
struct QWebEngineView;
struct QWindow;

// -----------------------------------------------------------------------------------------------------------

#define JOIN(A, B) A ## B

#define GTK3SYM(S) \
#define AUTOSYM(S) \
using JOIN(gtk3_, S) = decltype(&S); \
JOIN(gtk3_, S) S = reinterpret_cast<JOIN(gtk3_, S)>(dlsym(nullptr, #S)); \
DISTRHO_SAFE_ASSERT_RETURN(S != nullptr, false);

#define CSYM(S, NAME) \
S NAME = reinterpret_cast<S>(dlsym(nullptr, #NAME)); \
DISTRHO_SAFE_ASSERT_RETURN(NAME != nullptr, false);

#define CPPSYM(S, NAME, SN) \
S NAME = reinterpret_cast<S>(dlsym(nullptr, #SN)); \
DISTRHO_SAFE_ASSERT_RETURN(NAME != nullptr, false);

// -----------------------------------------------------------------------------------------------------------
// gtk3 variant

static bool gtk3(Display* const display, const Window winId, double scaleFactor, const char* const url)
{
void* const lib = dlopen("libwebkit2gtk-4.0.so.37_____", RTLD_NOW|RTLD_GLOBAL);
DISTRHO_SAFE_ASSERT_RETURN(lib != nullptr, false);

GTK3SYM(g_type_check_instance_cast)
GTK3SYM(gdk_set_allowed_backends)
GTK3SYM(gtk_container_add)
GTK3SYM(gtk_container_get_type)
GTK3SYM(gtk_init_check)
GTK3SYM(gtk_main)
GTK3SYM(gtk_plug_get_id)
GTK3SYM(gtk_plug_get_type)
GTK3SYM(gtk_plug_new)
GTK3SYM(gtk_widget_show_all)
GTK3SYM(gtk_window_get_type)
GTK3SYM(gtk_window_move)
GTK3SYM(gtk_window_set_default_size)
GTK3SYM(webkit_settings_new)
GTK3SYM(webkit_settings_set_hardware_acceleration_policy)
GTK3SYM(webkit_settings_set_javascript_can_access_clipboard)
GTK3SYM(webkit_web_view_get_type)
GTK3SYM(webkit_web_view_load_uri)
GTK3SYM(webkit_web_view_new_with_settings)
void* lib;
if ((lib = dlopen("libwebkit2gtk-4.0.so.37", RTLD_NOW|RTLD_GLOBAL)) == nullptr ||
(lib = dlopen("libwebkit2gtk-4.0.so", RTLD_NOW|RTLD_GLOBAL)) == nullptr)
return false;

using gdk_set_allowed_backends_t = void (*)(const char*);
using gtk_container_add_t = void (*)(GtkContainer*, GtkWidget*);
using gtk_init_check_t = bool (*)(int*, char***);
using gtk_main_t = void (*)();
using gtk_plug_get_id_t = Window (*)(GtkPlug*);
using gtk_plug_new_t = GtkWidget* (*)(Window);
using gtk_widget_show_all_t = void (*)(GtkWidget*);
using gtk_window_move_t = void (*)(GtkWindow*, int, int);
using gtk_window_set_default_size_t = void (*)(GtkWindow*, int, int);
using webkit_settings_new_t = WebKitSettings* (*)();
using webkit_settings_set_hardware_acceleration_policy_t = void (*)(WebKitSettings*, int);
using webkit_settings_set_javascript_can_access_clipboard_t = void (*)(WebKitSettings*, bool);
using webkit_web_view_load_uri_t = void (*)(WebKitWebView*, const char*);
using webkit_web_view_new_with_settings_t = GtkWidget* (*)(WebKitSettings*);

CSYM(gdk_set_allowed_backends_t, gdk_set_allowed_backends)
CSYM(gtk_container_add_t, gtk_container_add)
CSYM(gtk_init_check_t, gtk_init_check)
CSYM(gtk_main_t, gtk_main)
CSYM(gtk_plug_get_id_t, gtk_plug_get_id)
CSYM(gtk_plug_new_t, gtk_plug_new)
CSYM(gtk_widget_show_all_t, gtk_widget_show_all)
CSYM(gtk_window_move_t, gtk_window_move)
CSYM(gtk_window_set_default_size_t, gtk_window_set_default_size)
CSYM(webkit_settings_new_t, webkit_settings_new)
CSYM(webkit_settings_set_hardware_acceleration_policy_t, webkit_settings_set_hardware_acceleration_policy)
CSYM(webkit_settings_set_javascript_can_access_clipboard_t, webkit_settings_set_javascript_can_access_clipboard)
CSYM(webkit_web_view_load_uri_t, webkit_web_view_load_uri)
CSYM(webkit_web_view_new_with_settings_t, webkit_web_view_new_with_settings)

const int gdkScale = std::fmod(scaleFactor, 1.0) >= 0.75
? static_cast<int>(scaleFactor + 0.5)
Expand Down Expand Up @@ -100,7 +130,7 @@ static bool gtk3(Display* const display, const Window winId, double scaleFactor,
DISTRHO_SAFE_ASSERT_RETURN(settings != nullptr, false);

webkit_settings_set_javascript_can_access_clipboard(settings, true);
webkit_settings_set_hardware_acceleration_policy(settings, WEBKIT_HARDWARE_ACCELERATION_POLICY_NEVER);
webkit_settings_set_hardware_acceleration_policy(settings, 2 /* WEBKIT_HARDWARE_ACCELERATION_POLICY_NEVER */);

GtkWidget* const webview = webkit_web_view_new_with_settings(settings);
DISTRHO_SAFE_ASSERT_RETURN(webview != nullptr, false);
Expand All @@ -124,33 +154,42 @@ static bool gtk3(Display* const display, const Window winId, double scaleFactor,
// -----------------------------------------------------------------------------------------------------------
// qt5webengine variant

// using _QApplication_QApplication = decltype(QApplication::QApplication);

#define QT5SYM(S, NAME, SN) \
using SN = decltype(&S); \
SN NAME = reinterpret_cast<SN>(dlsym(nullptr, #SN)); \
DISTRHO_SAFE_ASSERT_RETURN(NAME != nullptr, false);

static bool qt5webengine(const Window winId, const double scaleFactor, const char* const url)
{
void* const lib = dlopen("libQt5WebEngineWidgets.so.5", RTLD_NOW|RTLD_GLOBAL);
DISTRHO_SAFE_ASSERT_RETURN(lib != nullptr, false);

// qOverload<int, QProcess::ExitStatus>(
// using qt5webengine_qapp = decltype(&QApplication::QApplication);
// qt5webengine_qapp qapp = reinterpret_cast<qt5webengine_qapp>(dlsym(nullptr, "QApplication::QApplication"));
// DISTRHO_SAFE_ASSERT_RETURN(qapp != nullptr, false);

// QT5SYM(QGuiApplication::QGuiApplication, QApplication_QApplication, _ZN15QGuiApplication4execEv)
QT5SYM(QApplication::setAttribute, QApplication_setAttribute, _ZN16QCoreApplication12setAttributeEN2Qt20ApplicationAttributeEb)
QT5SYM(QApplication::exec, QApplication_exec, _ZN15QGuiApplication4execEv)
// QT5SYM(QWebEngineView::move, QWebEngineView_move, _ZN7QWidget4moveERK6QPoint)
// QT5SYM(QWebEngineView::setFixedSize, QWebEngineView_setFixedSize, _ZN7QWidget12setFixedSizeEii)
// QT5SYM(QWebEngineView::winId, QWebEngineView_winId, _ZNK7QWidget5winIdEv)
// QT5SYM(QWebEngineView::windowHandle, QWebEngineView_windowHandle, _ZNK7QWidget12windowHandleEv)
// QT5SYM(QWebEngineView::setUrl, QWebEngineView_setUrl, _ZN14QWebEngineView6setUrlERK4QUrl)
// QT5SYM(QWebEngineView::show, QWebEngineView_show, _ZN7QWidget4showEv)
QT5SYM(QWindow::fromWinId, QWindow_fromWinId, _ZN7QWindow9fromWinIdEy)
void* lib;
if ((lib = dlopen("libQt5WebEngineWidgets.so.5", RTLD_NOW|RTLD_GLOBAL)) == nullptr ||
(lib = dlopen("libQt5WebEngineWidgets.so", RTLD_NOW|RTLD_GLOBAL)) == nullptr)
return false;

using QApplication__init_t = void (*)(QApplication*, int&, char**, int);
using QApplication_exec_t = void (*)();
using QApplication_setAttribute_t = void (*)(Qt::ApplicationAttribute, bool);
using QString__init_t = void (*)(void*, const QChar*, qsizetype);
using QUrl__init_t = void (*)(void*, const QString&, int /* QUrl::ParsingMode */);
using QWebEngineView__init_t = void (*)(QWebEngineView*, void*);
using QWebEngineView_move_t = void (*)(QWebEngineView*, const QPoint&);
using QWebEngineView_resize_t = void (*)(QWebEngineView*, const QSize&);
using QWebEngineView_setUrl_t = void (*)(QWebEngineView*, const QUrl&);
using QWebEngineView_show_t = void (*)(QWebEngineView*);
using QWebEngineView_winId_t = ulonglong (*)(QWebEngineView*);
using QWebEngineView_windowHandle_t = QWindow* (*)(QWebEngineView*);
using QWindow_fromWinId_t = QWindow* (*)(ulonglong);
using QWindow_setParent_t = void (*)(QWindow*, void*);

CPPSYM(QApplication__init_t, QApplication__init, _ZN12QApplicationC1ERiPPci)
CPPSYM(QApplication_exec_t, QApplication_exec, _ZN15QGuiApplication4execEv)
CPPSYM(QApplication_setAttribute_t, QApplication_setAttribute, _ZN16QCoreApplication12setAttributeEN2Qt20ApplicationAttributeEb)
CPPSYM(QString__init_t, QString__init, _ZN7QStringC2EPK5QChari)
CPPSYM(QUrl__init_t, QUrl__init, _ZN4QUrlC1ERK7QStringNS_11ParsingModeE)
CPPSYM(QWebEngineView__init_t, QWebEngineView__init, _ZN14QWebEngineViewC1EP7QWidget)
CPPSYM(QWebEngineView_move_t, QWebEngineView_move, _ZN7QWidget4moveERK6QPoint)
CPPSYM(QWebEngineView_resize_t, QWebEngineView_resize, _ZN7QWidget6resizeERK5QSize)
CPPSYM(QWebEngineView_setUrl_t, QWebEngineView_setUrl, _ZN14QWebEngineView6setUrlERK4QUrl)
CPPSYM(QWebEngineView_show_t, QWebEngineView_show, _ZN7QWidget4showEv)
CPPSYM(QWebEngineView_winId_t, QWebEngineView_winId, _ZNK7QWidget5winIdEv)
CPPSYM(QWebEngineView_windowHandle_t, QWebEngineView_windowHandle, _ZNK7QWidget12windowHandleEv)
CPPSYM(QWindow_fromWinId_t, QWindow_fromWinId, _ZN7QWindow9fromWinIdEy)
CPPSYM(QWindow_setParent_t, QWindow_setParent, _ZN7QWindow9setParentEPS_)

unsetenv("QT_FONT_DPI");
unsetenv("QT_SCREEN_SCALE_FACTORS");
Expand All @@ -168,28 +207,137 @@ static bool qt5webengine(const Window winId, const double scaleFactor, const cha
static int argc = 0;
static char* argv[] = { nullptr };

uint8_t app_data[sizeof(QApplication)];
QApplication* const app = reinterpret_cast<QApplication*>(app_data);
new(app)QApplication(argc, argv);
uint8_t _app[64]; // sizeof(QApplication) == 16
QApplication* const app = reinterpret_cast<QApplication*>(_app);
QApplication__init(app, argc, argv, 0);

uint8_t _qstrurl[32]; // sizeof(QString) == 8
QString* const qstrurl(reinterpret_cast<QString*>(_qstrurl));

QWindow* const parentWindow = QWindow_fromWinId(winId);
{
const size_t url_len = std::strlen(url);
QChar* const url_qchar = new QChar[url_len + 1];

for (size_t i = 0; i < url_len; ++i)
url_qchar[i] = QChar(url[i]);

url_qchar[url_len] = 0;

QString__init(qstrurl, url_qchar, url_len);
}

uint8_t _qurl[32]; // sizeof(QUrl) == 8
QUrl* const qurl(reinterpret_cast<QUrl*>(_qurl));
QUrl__init(qurl, *qstrurl, 1 /* QUrl::StrictMode */);

uint8_t webview_data[sizeof(QWebEngineView)];
QWebEngineView* const webview = reinterpret_cast<QWebEngineView*>(webview_data);
new(webview)QWebEngineView();
uint8_t _webview[128]; // sizeof(QWebEngineView) == 56
QWebEngineView* const webview = reinterpret_cast<QWebEngineView*>(_webview);
QWebEngineView__init(webview, nullptr);

webview->move(0, kVerticalOffset);
webview->setFixedSize(DISTRHO_UI_DEFAULT_WIDTH,
DISTRHO_UI_DEFAULT_HEIGHT - kVerticalOffset);
webview->winId();
webview->windowHandle()->setParent(parentWindow);
webview->setUrl(QUrl(QString::fromLocal8Bit(url)));
webview->show();
QWebEngineView_move(webview, QPoint(0, kVerticalOffset));
QWebEngineView_resize(webview, QSize(DISTRHO_UI_DEFAULT_WIDTH, DISTRHO_UI_DEFAULT_HEIGHT - kVerticalOffset));
QWebEngineView_winId(webview);
QWindow_setParent(QWebEngineView_windowHandle(webview), QWindow_fromWinId(winId));
QWebEngineView_setUrl(webview, *qurl);
QWebEngineView_show(webview);

QApplication_exec();

webview->~QWebEngineView();
app->~QApplication();
dlclose(lib);
return true;
}

// -----------------------------------------------------------------------------------------------------------
// qt6webengine variant (same as qt5 but `QString__init_t` has different arguments)

static bool qt6webengine(const Window winId, const double scaleFactor, const char* const url)
{
void* lib;
if ((lib = dlopen("libQt6WebEngineWidgets.so.6", RTLD_NOW|RTLD_GLOBAL)) == nullptr ||
(lib = dlopen("libQt6WebEngineWidgets.so", RTLD_NOW|RTLD_GLOBAL)) == nullptr)
return false;

using QApplication__init_t = void (*)(QApplication*, int&, char**, int);
using QApplication_exec_t = void (*)();
using QApplication_setAttribute_t = void (*)(Qt::ApplicationAttribute, bool);
using QString__init_t = void (*)(void*, const QChar*, long long);
using QUrl__init_t = void (*)(void*, const QString&, int /* QUrl::ParsingMode */);
using QWebEngineView__init_t = void (*)(QWebEngineView*, void*);
using QWebEngineView_move_t = void (*)(QWebEngineView*, const QPoint&);
using QWebEngineView_resize_t = void (*)(QWebEngineView*, const QSize&);
using QWebEngineView_setUrl_t = void (*)(QWebEngineView*, const QUrl&);
using QWebEngineView_show_t = void (*)(QWebEngineView*);
using QWebEngineView_winId_t = ulonglong (*)(QWebEngineView*);
using QWebEngineView_windowHandle_t = QWindow* (*)(QWebEngineView*);
using QWindow_fromWinId_t = QWindow* (*)(ulonglong);
using QWindow_setParent_t = void (*)(QWindow*, void*);

CPPSYM(QApplication__init_t, QApplication__init, _ZN12QApplicationC1ERiPPci)
CPPSYM(QApplication_exec_t, QApplication_exec, _ZN15QGuiApplication4execEv)
CPPSYM(QApplication_setAttribute_t, QApplication_setAttribute, _ZN16QCoreApplication12setAttributeEN2Qt20ApplicationAttributeEb)
CPPSYM(QString__init_t, QString__init, _ZN7QStringC2EPK5QCharx)
CPPSYM(QUrl__init_t, QUrl__init, _ZN4QUrlC1ERK7QStringNS_11ParsingModeE)
CPPSYM(QWebEngineView__init_t, QWebEngineView__init, _ZN14QWebEngineViewC1EP7QWidget)
CPPSYM(QWebEngineView_move_t, QWebEngineView_move, _ZN7QWidget4moveERK6QPoint)
CPPSYM(QWebEngineView_resize_t, QWebEngineView_resize, _ZN7QWidget6resizeERK5QSize)
CPPSYM(QWebEngineView_setUrl_t, QWebEngineView_setUrl, _ZN14QWebEngineView6setUrlERK4QUrl)
CPPSYM(QWebEngineView_show_t, QWebEngineView_show, _ZN7QWidget4showEv)
CPPSYM(QWebEngineView_winId_t, QWebEngineView_winId, _ZNK7QWidget5winIdEv)
CPPSYM(QWebEngineView_windowHandle_t, QWebEngineView_windowHandle, _ZNK7QWidget12windowHandleEv)
CPPSYM(QWindow_fromWinId_t, QWindow_fromWinId, _ZN7QWindow9fromWinIdEy)
CPPSYM(QWindow_setParent_t, QWindow_setParent, _ZN7QWindow9setParentEPS_)

unsetenv("QT_FONT_DPI");
unsetenv("QT_SCREEN_SCALE_FACTORS");
unsetenv("QT_USE_PHYSICAL_DPI");
setenv("QT_AUTO_SCREEN_SCALE_FACTOR", "0", 1);

char scale[8] = {};
std::snprintf(scale, 7, "%.2f", scaleFactor);
setenv("QT_SCALE_FACTOR", scale, 1);

QApplication_setAttribute(Qt::AA_X11InitThreads, true);
QApplication_setAttribute(Qt::AA_EnableHighDpiScaling, true);
QApplication_setAttribute(Qt::AA_UseHighDpiPixmaps, true);

static int argc = 0;
static char* argv[] = { nullptr };

uint8_t _app[64]; // sizeof(QApplication) == 16
QApplication* const app = reinterpret_cast<QApplication*>(_app);
QApplication__init(app, argc, argv, 0);

uint8_t _qstrurl[32]; // sizeof(QString) == 8
QString* const qstrurl(reinterpret_cast<QString*>(_qstrurl));

{
const size_t url_len = std::strlen(url);
QChar* const url_qchar = new QChar[url_len + 1];

for (size_t i = 0; i < url_len; ++i)
url_qchar[i] = QChar(url[i]);

url_qchar[url_len] = 0;

QString__init(qstrurl, url_qchar, url_len);
}

uint8_t _qurl[32]; // sizeof(QUrl) == 8
QUrl* const qurl(reinterpret_cast<QUrl*>(_qurl));
QUrl__init(qurl, *qstrurl, 1 /* QUrl::StrictMode */);

uint8_t _webview[128]; // sizeof(QWebEngineView) == 56
QWebEngineView* const webview = reinterpret_cast<QWebEngineView*>(_webview);
QWebEngineView__init(webview, nullptr);

QWebEngineView_move(webview, QPoint(0, kVerticalOffset));
QWebEngineView_resize(webview, QSize(DISTRHO_UI_DEFAULT_WIDTH, DISTRHO_UI_DEFAULT_HEIGHT - kVerticalOffset));
QWebEngineView_winId(webview);
QWindow_setParent(QWebEngineView_windowHandle(webview), QWindow_fromWinId(winId));
QWebEngineView_setUrl(webview, *qurl);
QWebEngineView_show(webview);

QApplication_exec();

dlclose(lib);
return true;
Expand Down Expand Up @@ -220,6 +368,7 @@ int main(int argc, char* argv[])
std::snprintf(url, 31, "http://127.0.0.1:%s/", argv[3]);

const bool ok = qt5webengine(winId, scaleFactor, url) ||
qt6webengine(winId, scaleFactor, url) ||
gtk3(display, winId, scaleFactor, url);

XCloseDisplay(display);
Expand Down

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