From 89b414dc8a9c3285e1f16f88b9683b96dbc63d03 Mon Sep 17 00:00:00 2001
From: K4sum1 <k4sum1@eclipse.cx>
Date: Tue, 23 Jul 2024 01:25:18 -0500
Subject: [PATCH] Very broken initial Cairo backend support

---
 gfx/thebes/gfxPlatform.cpp        | 20 ++++++++++----------
 gfx/thebes/gfxWindowsPlatform.cpp |  6 ++++--
 modules/libpref/init/all.js       |  8 +++++---
 3 files changed, 19 insertions(+), 15 deletions(-)

diff --git a/gfx/thebes/gfxPlatform.cpp b/gfx/thebes/gfxPlatform.cpp
index f84e6fb99073cf..22ef0fca859317 100644
--- a/gfx/thebes/gfxPlatform.cpp
+++ b/gfx/thebes/gfxPlatform.cpp
@@ -1921,16 +1921,16 @@ gfxFontEntry* gfxPlatform::MakePlatformFont(const nsACString& aFontName,
 BackendPrefsData gfxPlatform::GetBackendPrefs() const {
   BackendPrefsData data;
 
-  data.mCanvasBitmask = BackendTypeBit(BackendType::SKIA);
-  data.mContentBitmask = BackendTypeBit(BackendType::SKIA);
+  data.mCanvasBitmask = BackendTypeBit(BackendType::CAIRO);
+  data.mContentBitmask = BackendTypeBit(BackendType::CAIRO);
 
-#ifdef MOZ_WIDGET_GTK
-  data.mCanvasBitmask |= BackendTypeBit(BackendType::CAIRO);
-  data.mContentBitmask |= BackendTypeBit(BackendType::CAIRO);
+#ifndef MOZ_WIDGET_GTK
+  data.mCanvasBitmask |= BackendTypeBit(BackendType::SKIA);
+  data.mContentBitmask |= BackendTypeBit(BackendType::SKIA);
 #endif
 
-  data.mCanvasDefault = BackendType::SKIA;
-  data.mContentDefault = BackendType::SKIA;
+  data.mCanvasDefault = BackendType::CAIRO;
+  data.mContentDefault = BackendType::CAIRO;
 
   return data;
 }
@@ -1963,9 +1963,9 @@ void gfxPlatform::InitBackendPrefs(BackendPrefsData&& aPrefsData) {
     mContentBackendBitmask |= BackendTypeBit(aPrefsData.mContentDefault);
   }
 
-  uint32_t swBackendBits = BackendTypeBit(BackendType::SKIA);
-#ifdef MOZ_WIDGET_GTK
-  swBackendBits |= BackendTypeBit(BackendType::CAIRO);
+  uint32_t swBackendBits = BackendTypeBit(BackendType::CAIRO);
+#ifndef MOZ_WIDGET_GTK
+  swBackendBits |= BackendTypeBit(BackendType::SKIA);
 #endif
   mSoftwareBackend = GetContentBackendPref(swBackendBits);
   if (mSoftwareBackend == BackendType::NONE) {
diff --git a/gfx/thebes/gfxWindowsPlatform.cpp b/gfx/thebes/gfxWindowsPlatform.cpp
index 779db14d09d611..ff735d463ce52c 100644
--- a/gfx/thebes/gfxWindowsPlatform.cpp
+++ b/gfx/thebes/gfxWindowsPlatform.cpp
@@ -504,8 +504,10 @@ bool gfxWindowsPlatform::HandleDeviceReset() {
 BackendPrefsData gfxWindowsPlatform::GetBackendPrefs() const {
   BackendPrefsData data;
 
-  data.mCanvasBitmask = BackendTypeBit(BackendType::SKIA);
-  data.mContentBitmask = BackendTypeBit(BackendType::SKIA);
+  data.mCanvasBitmask =
+      BackendTypeBit(BackendType::CAIRO) | BackendTypeBit(BackendType::SKIA);
+  data.mContentBitmask =
+      BackendTypeBit(BackendType::CAIRO) | BackendTypeBit(BackendType::SKIA);
   data.mCanvasDefault = BackendType::SKIA;
   data.mContentDefault = BackendType::SKIA;
 
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 18f341ed718b5b..5a8d5a0cb3699f 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -414,14 +414,16 @@ pref("gfx.downloadable_fonts.fallback_delay_short", 100);
 
 #if defined(XP_WIN)
   // comma separated list of backends to use in order of preference
-  // e.g., pref("gfx.canvas.azure.backends", "direct2d,skia");
-  pref("gfx.canvas.azure.backends", "direct2d1.1,skia");
+  // e.g., pref("gfx.canvas.azure.backends", "direct2d,skia,cairo");
+  pref("gfx.canvas.azure.backends", "direct2d1.1,skia,cairo");
+  pref("gfx.content.azure.backends", "direct2d1.1,skia,cairo");
 #elif defined(XP_MACOSX)
   pref("gfx.canvas.azure.backends", "skia");
+  pref("gfx.content.azure.backends", "skia");
 #else
   pref("gfx.canvas.azure.backends", "skia");
+  pref("gfx.content.azure.backends", "skia");
 #endif
-pref("gfx.content.azure.backends", "skia");
 
 #ifdef XP_WIN
   pref("gfx.webrender.flip-sequential", false);