refactor: use stubs for libgdk-pixbuf dependency (#34602)

BUILD.gn

@@ -80,7 +80,10 @@ if (is_linux) {
   }
 
   generate_stubs("electron_gtk_stubs") {
-    sigs = [ "shell/browser/ui/electron_gtk.sigs" ]
+    sigs = [
+      "shell/browser/ui/electron_gdk_pixbuf.sigs",
+      "shell/browser/ui/electron_gtk.sigs",
+    ]
     extra_header = "shell/browser/ui/electron_gtk.fragment"
     output_name = "electron_gtk_stubs"
     public_deps = [ "//ui/gtk:gtk_config" ]

patches/chromium/make_gtk_getlibgtk_public.patch

@@ -1,16 +1,28 @@
 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
 From: deepak1556 <[email protected]>
 Date: Thu, 7 Apr 2022 20:30:16 +0900
-Subject: Make gtk::GetLibGtk public
+Subject: Make gtk::GetLibGtk and gtk::GetLibGdkPixbuf public
 
-Allows embedders to get a handle to the gtk library
-already loaded in the process.
+Allows embedders to get a handle to the gtk and
+gdk_pixbuf libraries already loaded in the process.
 
 diff --git a/ui/gtk/gtk_compat.cc b/ui/gtk/gtk_compat.cc
-index 0ed04582106639911d9a4e0284ff880be9c3bc74..bfda81b08be52406048be9b96d2de59223d56ee7 100644
+index 0ed04582106639911d9a4e0284ff880be9c3bc74..0f7aaf3254864e92a54634dedb2fd2fbf8eb8990 100644
 --- a/ui/gtk/gtk_compat.cc
 +++ b/ui/gtk/gtk_compat.cc
-@@ -86,12 +86,6 @@ void* GetLibGtk4(bool check = true) {
+@@ -66,11 +66,6 @@ void* GetLibGio() {
+   return libgio;
+ }
+ 
+-void* GetLibGdkPixbuf() {
+-  static void* libgdk_pixbuf = DlOpen("libgdk_pixbuf-2.0.so.0");
+-  return libgdk_pixbuf;
+-}
+-
+ void* GetLibGdk3() {
+   static void* libgdk3 = DlOpen("libgdk-3.so.0");
+   return libgdk3;
+@@ -86,12 +81,6 @@ void* GetLibGtk4(bool check = true) {
    return libgtk4;
  }
  
@@ -23,10 +35,15 @@ index 0ed04582106639911d9a4e0284ff880be9c3bc74..bfda81b08be52406048be9b96d2de592
  bool LoadGtk3() {
    if (!GetLibGtk3(false))
      return false;
-@@ -134,6 +128,12 @@ gfx::Insets InsetsFromGtkBorder(const GtkBorder& border) {
+@@ -134,6 +123,17 @@ gfx::Insets InsetsFromGtkBorder(const GtkBorder& border) {
  
  }  // namespace
  
++void* GetLibGdkPixbuf() {
++  static void* libgdk_pixbuf = DlOpen("libgdk_pixbuf-2.0.so.0");
++  return libgdk_pixbuf;
++}
++
 +void* GetLibGtk() {
 +  if (GtkCheckVersion(4))
 +    return GetLibGtk4();
@@ -37,13 +54,16 @@ index 0ed04582106639911d9a4e0284ff880be9c3bc74..bfda81b08be52406048be9b96d2de592
    static bool loaded = LoadGtkImpl();
    return loaded;
 diff --git a/ui/gtk/gtk_compat.h b/ui/gtk/gtk_compat.h
-index 72981270fe26579211afcaf3c596a412f69f5fac..b5dbfde5b011d57d26960d245e0dc61cac9341e4 100644
+index 72981270fe26579211afcaf3c596a412f69f5fac..63e383f03f51124f67a0c522f57eb4cc23857bc1 100644
 --- a/ui/gtk/gtk_compat.h
 +++ b/ui/gtk/gtk_compat.h
-@@ -37,6 +37,9 @@ using SkColor = uint32_t;
+@@ -37,6 +37,12 @@ using SkColor = uint32_t;
  
  namespace gtk {
  
++// Get handle to the currently loaded gdk-pixbuf library in the process.
++void* GetLibGdkPixbuf();
++
 +// Get handle to the currently loaded gtk library in the process.
 +void* GetLibGtk();
 +

shell/browser/electron_browser_main_parts.cc

@@ -376,6 +376,10 @@ void ElectronBrowserMainParts::ToolkitInitialized() {
     electron::UninitializeElectron_gtk();
   }
 
+  electron::InitializeElectron_gdk_pixbuf(gtk::GetLibGdkPixbuf());
+  CHECK(electron::IsElectron_gdk_pixbufInitialized())
+      << "Failed to initialize libgdk_pixbuf-2.0.so.0";
+
   // Chromium does not respect GTK dark theme setting, but they may change
   // in future and this code might be no longer needed. Check the Chromium
   // issue to keep updated:

shell/browser/ui/electron_gdk_pixbuf.sigs

@@ -0,0 +1,3 @@
+GdkPixbuf* gdk_pixbuf_new(GdkColorspace colorspace, gboolean has_alpha, int bits_per_sample, int width, int height)
+GdkPixbuf* gdk_pixbuf_scale_simple(const GdkPixbuf* src, int dest_width, int dest_height, GdkInterpType interp_type)
+guchar* gdk_pixbuf_get_pixels(const GdkPixbuf* pixbuf)

shell/browser/ui/electron_gtk.fragment

@@ -1 +1,2 @@
-#include <gtk/gtk.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gtk/gtk.h>

shell/browser/ui/electron_gtk.sigs

@@ -4,4 +4,4 @@ void gtk_native_dialog_show(GtkNativeDialog* self);
 void gtk_native_dialog_hide(GtkNativeDialog* self);
 gint gtk_native_dialog_run(GtkNativeDialog* self);
 void gtk_native_dialog_destroy(GtkNativeDialog* self);
-GType gtk_native_dialog_get_type(void);
+GType gtk_native_dialog_get_type(void);

shell/browser/ui/gtk_util.cc

@@ -12,6 +12,7 @@
 
 #include "base/no_destructor.h"
 #include "base/strings/string_number_conversions.h"
+#include "electron/electron_gtk_stubs.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "third_party/skia/include/core/SkUnPreMultiply.h"

shell/browser/ui/message_box_gtk.cc

@@ -11,6 +11,7 @@
 #include "base/no_destructor.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
+#include "electron/electron_gtk_stubs.h"
 #include "shell/browser/browser.h"
 #include "shell/browser/native_window_observer.h"
 #include "shell/browser/native_window_views.h"