From c1cf096c1b38e817490c8cedde05af1e6e22a585 Mon Sep 17 00:00:00 2001
From: Jared Petker <jared.r.petker@gmail.com>
Date: Mon, 19 Dec 2016 21:25:27 -0800
Subject: [PATCH] add ability to set weather the background should be cleared
 on RendererOptions

---
 replay/src/main.rs        | 1 +
 sample/src/main.rs        | 1 +
 webrender/src/renderer.rs | 5 ++++-
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/replay/src/main.rs b/replay/src/main.rs
index 17033743e3..3572cd2744 100644
--- a/replay/src/main.rs
+++ b/replay/src/main.rs
@@ -119,6 +119,7 @@ fn main() {
         renderer_kind: webrender_traits::RendererKind::Native,
         debug: false,
         enable_subpixel_aa: false,
+        clear_background: true,
         clear_framebuffer: true,
         clear_empty_tiles: false,
         clear_color: ColorF::new(1.0, 1.0, 1.0, 1.0),
diff --git a/sample/src/main.rs b/sample/src/main.rs
index eb6fe1fad3..acc31d7824 100644
--- a/sample/src/main.rs
+++ b/sample/src/main.rs
@@ -85,6 +85,7 @@ fn main() {
         precache_shaders: true,
         renderer_kind: RendererKind::Native,
         enable_subpixel_aa: false,
+        clear_background: true,
         clear_framebuffer: true,
         clear_empty_tiles: false,
         clear_color: ColorF::new(1.0, 1.0, 1.0, 1.0),
diff --git a/webrender/src/renderer.rs b/webrender/src/renderer.rs
index 228453de10..3e520bb1ba 100644
--- a/webrender/src/renderer.rs
+++ b/webrender/src/renderer.rs
@@ -335,6 +335,7 @@ pub struct Renderer {
     notifier: Arc<Mutex<Option<Box<RenderNotifier>>>>,
 
     enable_profiler: bool,
+    clear_background: bool,
     clear_framebuffer: bool,
     clear_empty_tiles: bool,
     clear_color: ColorF,
@@ -672,6 +673,7 @@ impl Renderer {
             profile_counters: RendererProfileCounters::new(),
             profiler: Profiler::new(),
             enable_profiler: options.enable_profiler,
+            clear_background: options.clear_background,
             clear_framebuffer: options.clear_framebuffer,
             clear_empty_tiles: options.clear_empty_tiles,
             clear_color: options.clear_color,
@@ -1376,7 +1378,7 @@ impl Renderer {
                      DeviceSize::new(framebuffer_size.width as f32, framebuffer_size.height as f32),
                      None)
                 } else {
-                    (true, frame.cache_size, Some(self.render_targets[pass_index]))
+                    (self.clear_background, frame.cache_size, Some(self.render_targets[pass_index]))
                 };
 
                 for (target_index, target) in pass.targets.iter().enumerate() {
@@ -1471,5 +1473,6 @@ pub struct RendererOptions {
     // TODO: this option ignores the clear color (always opaque white).
     pub clear_empty_tiles: bool,
     pub clear_framebuffer: bool,
+    pub clear_background: bool,
     pub clear_color: ColorF,
 }