Backed out 4 changesets (bug 1596086) for reftest failures on reftest.list . CLOSED TREE

Backed out changeset 651a7556124b (bug 1596086)
Backed out changeset ab2e0e2a9048 (bug 1596086)
Backed out changeset 00ccdb940ea2 (bug 1596086)
Backed out changeset 57869dbf0a8b (bug 1596086)

gfx/wr/webrender/src/prim_store/gradient.rs

@@ -166,22 +166,25 @@ impl From<LinearGradientKey> for LinearGradientTemplate {
             // Fast path not supported on segmented (border-image) gradients.
             item.nine_patch.is_none();
 
-        let mut prev_offset = None;
         // Convert the stops to more convenient representation
         // for the current gradient builder.
+        let mut prev_color = None;
+
         let stops: Vec<GradientStop> = item.stops.iter().map(|stop| {
             let color: ColorF = stop.color.into();
             min_alpha = min_alpha.min(color.a);
 
-            // The fast path doesn't support hard color stops, yet.
-            // Since the length of the gradient is a fixed size (512 device pixels), if there
-            // is a hard stop you will see bilinear interpolation with this method, instead
-            // of an abrupt color change.
-            if prev_offset == Some(stop.offset) {
-                supports_caching = false;
+            if let Some(prev_color) = prev_color {
+                // The fast path doesn't support hard color stops, yet.
+                // Since the length of the gradient is a fixed size (512 device pixels), if there
+                // is a hard stop you will see bilinear interpolation with this method, instead
+                // of an abrupt color change.
+                if prev_color == color {
+                    supports_caching = false;
+                }
             }
 
-            prev_offset = Some(stop.offset);
+            prev_color = Some(color);
 
             GradientStop {
                 offset: stop.offset,

gfx/wr/wrench/reftests/gradient/linear-hard-stop.yaml

@@ -1,8 +0,0 @@
----
-root:
-  items:
-    - type: gradient
-      bounds: 50 50 200 200
-      start: 0 0
-      end: 0 100
-      stops: [0.0, blue, 0.5 , red, 0.5, green]

gfx/wr/wrench/reftests/gradient/reftest.list

@@ -14,8 +14,6 @@ platform(linux,mac) fuzzy(1,35000) == linear-stops.yaml linear-stops-ref.png
 == linear-clamp-1b.yaml linear-clamp-1-ref.yaml
 == linear-clamp-2.yaml linear-clamp-2-ref.yaml
 
-== linear-hard-stop.yaml linear-hard-stop-ref.png
-
 # dithering requires us to fuzz here
 fuzzy(1,20000) == linear.yaml linear-ref.yaml
 fuzzy(1,20000) == linear-reverse.yaml linear-ref.yaml

layout/reftests/css-gradients/reftest.list

@@ -4,7 +4,8 @@ fuzzy-if(!contentSameGfxBackendAsCanvas,0-2,0-88500) fuzzy-if(azureSkiaGL,0-2,0-
 == linear-diagonal-2a.html linear-diagonal-2-ref.html
 == linear-diagonal-3a.html linear-diagonal-3-ref.html
 == linear-diagonal-4a.html linear-diagonal-4-ref.html
-fuzzy-if(webrender, 0-1, 23000-43000) == linear-premul.html linear-premul-ref.html
+== linear-premul.html linear-premul-ref.html
+
 fuzzy(0-1,0-800000) == linear-flipped-1.html linear-flipped-1-ref.html
 == linear-position-1a.html linear-position-1-ref.html
 == linear-repeat-1a.html linear-repeat-1-ref.html

testing/web-platform/meta/css/css-backgrounds/background-image-none-gradient-repaint.html.ini

@@ -0,0 +1,3 @@
+[background-image-none-gradient-repaint.html]
+  expected:
+    if webrender and (os == "win"): FAIL

testing/web-platform/meta/css/css-values/angle-units-001.html.ini

@@ -0,0 +1,3 @@
+[angle-units-001.html]
+  expected:
+    if (os == "win") and webrender: FAIL

testing/web-platform/meta/css/css-values/angle-units-002.html.ini

@@ -0,0 +1,3 @@
+[angle-units-002.html]
+  expected:
+    if (os == "win") and webrender: FAIL

testing/web-platform/meta/css/css-values/angle-units-003.html.ini

@@ -0,0 +1,3 @@
+[angle-units-003.html]
+  expected:
+    if (os == "win") and webrender: FAIL

testing/web-platform/meta/css/css-values/angle-units-005.html.ini

@@ -0,0 +1,3 @@
+[angle-units-005.html]
+  expected:
+    if (os == "win") and webrender: FAIL