From 01cd151a04cbe57c77543e3e365e46b9a71463bc Mon Sep 17 00:00:00 2001
From: sotaro <sotaro.ikeda.g@gmail.com>
Date: Sat, 20 Nov 2021 22:52:14 +0000
Subject: [PATCH] Bug 1741775 - Remove LayersBackend::LAYERS_OPENGL
 r=gfx-reviewers,nical

LayersBackend::LAYERS_OPENGL is not used any more.

Code under widget/uikit is dead code.

Differential Revision: https://phabricator.services.mozilla.com/D131461
---
 gfx/layers/CanvasRenderer.cpp       | 1 -
 gfx/layers/LayersTypes.cpp          | 2 --
 gfx/layers/LayersTypes.h            | 7 +------
 gfx/layers/client/TextureClient.cpp | 5 ++---
 widget/uikit/nsWindow.mm            | 3 +--
 5 files changed, 4 insertions(+), 14 deletions(-)

diff --git a/gfx/layers/CanvasRenderer.cpp b/gfx/layers/CanvasRenderer.cpp
index e7a7a130eb8c..6aad84bd57c2 100644
--- a/gfx/layers/CanvasRenderer.cpp
+++ b/gfx/layers/CanvasRenderer.cpp
@@ -93,7 +93,6 @@ TextureType TexTypeForWebgl(KnowsCompositor* const knowsCompositor) {
     case LayersBackend::LAYERS_NONE:
       return TextureType::Unknown;
 
-    case LayersBackend::LAYERS_OPENGL:
     case LayersBackend::LAYERS_WR:
       break;
   }
diff --git a/gfx/layers/LayersTypes.cpp b/gfx/layers/LayersTypes.cpp
index bb2b67f668bf..b89fad22af23 100644
--- a/gfx/layers/LayersTypes.cpp
+++ b/gfx/layers/LayersTypes.cpp
@@ -30,8 +30,6 @@ const char* GetLayersBackendName(LayersBackend aBackend) {
   switch (aBackend) {
     case LayersBackend::LAYERS_NONE:
       return "none";
-    case LayersBackend::LAYERS_OPENGL:
-      return "opengl";
     case LayersBackend::LAYERS_WR:
       MOZ_ASSERT(gfx::gfxVars::UseWebRender());
       if (gfx::gfxVars::UseSoftwareWebRender()) {
diff --git a/gfx/layers/LayersTypes.h b/gfx/layers/LayersTypes.h
index 1ab76939c061..11025ab635d3 100644
--- a/gfx/layers/LayersTypes.h
+++ b/gfx/layers/LayersTypes.h
@@ -165,12 +165,7 @@ typedef BaseTransactionId<CompositionOpportunityType> CompositionOpportunityId;
 /// content in the window.
 enum class WindowKind : int8_t { MAIN = 0, SECONDARY, LAST };
 
-enum class LayersBackend : int8_t {
-  LAYERS_NONE = 0,
-  LAYERS_OPENGL,
-  LAYERS_WR,
-  LAYERS_LAST
-};
+enum class LayersBackend : int8_t { LAYERS_NONE = 0, LAYERS_WR, LAYERS_LAST };
 
 enum class WebRenderBackend : int8_t { HARDWARE = 0, SOFTWARE, LAST };
 
diff --git a/gfx/layers/client/TextureClient.cpp b/gfx/layers/client/TextureClient.cpp
index 230813edb428..73937820fbf4 100644
--- a/gfx/layers/client/TextureClient.cpp
+++ b/gfx/layers/client/TextureClient.cpp
@@ -275,9 +275,8 @@ static TextureType GetTextureType(gfx::SurfaceFormat aFormat,
 #endif
 
 #ifdef MOZ_WAYLAND
-  if ((layersBackend == LayersBackend::LAYERS_OPENGL ||
-       (layersBackend == LayersBackend::LAYERS_WR &&
-        !aKnowsCompositor->UsingSoftwareWebRender())) &&
+  if ((layersBackend == LayersBackend::LAYERS_WR &&
+       !aKnowsCompositor->UsingSoftwareWebRender()) &&
       widget::GetDMABufDevice()->IsDMABufTexturesEnabled() &&
       aFormat != SurfaceFormat::A8) {
     return TextureType::DMABUF;
diff --git a/widget/uikit/nsWindow.mm b/widget/uikit/nsWindow.mm
index 702a8b97ebb1..da5cbf3fb48b 100644
--- a/widget/uikit/nsWindow.mm
+++ b/widget/uikit/nsWindow.mm
@@ -239,8 +239,7 @@ class nsAutoRetainUIKitObject {
 - (BOOL)isUsingMainThreadOpenGL {
   if (!mGeckoChild || ![self window]) return NO;
 
-  return mGeckoChild->GetLayerManager(nullptr)->GetBackendType() ==
-         mozilla::layers::LayersBackend::LAYERS_OPENGL;
+  return NO;
 }
 
 - (void)drawUsingOpenGL {