From 1beb6433509a2cb4642521769bdc279c5a876881 Mon Sep 17 00:00:00 2001
From: sotaro <sotaro.ikeda.g@gmail.com>
Date: Mon, 24 May 2021 21:47:30 +0000
Subject: [PATCH] Bug 1704000 - Request rendering for
 RenderCompositorOGLSWGL::MaybeReadback() r=gfx-reviewers,bradwerth

Differential Revision: https://phabricator.services.mozilla.com/D115778
---
 gfx/webrender_bindings/RenderCompositorOGLSWGL.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/gfx/webrender_bindings/RenderCompositorOGLSWGL.h b/gfx/webrender_bindings/RenderCompositorOGLSWGL.h
index 5073e40c5ab1..74aea775d731 100644
--- a/gfx/webrender_bindings/RenderCompositorOGLSWGL.h
+++ b/gfx/webrender_bindings/RenderCompositorOGLSWGL.h
@@ -35,6 +35,11 @@ class RenderCompositorOGLSWGL : public RenderCompositorLayersSWGL {
   bool BeginFrame() override;
   RenderedFrameId EndFrame(const nsTArray<DeviceIntRect>& aDirtyRects) override;
 
+  // Returns true for requesting rendering during readback.
+  // RenderCompositorOGLSWGL::MaybeReadback() requests rendering.
+  // This value is not used by WebRender, since native compositor API is used
+  // for sw-wr.
+  bool UsePartialPresent() override { return true; }
   bool RequestFullRender() override;
 
   void Pause() override;