Bug 1699884 - Restore SWGL radial gradient fast-path in cs_radial_gradient. r=jrmuizel,gfx-reviewers,nical

Bug 1687977 removed brush_radial_gradient as well as the SWGL fast-path with it. This
adds it back inside cs_radial_gradient.

Differential Revision: https://phabricator.services.mozilla.com/D109195

gfx/wr/webrender/res/cs_radial_gradient.glsl

@@ -6,9 +6,7 @@
 
 varying vec2 v_pos;
 
-flat varying vec2 v_center;
 flat varying float v_start_radius;
-flat varying float v_end_radius;
 
 #ifdef WR_VERTEX_SHADER
 
@@ -37,12 +35,9 @@ void main(void) {
     // Transform all coordinates by the y scale so the
     // fragment shader can work with circles
 
-    // v_pos and v_center are in a coordinate space relative to the task rect
+    // v_pos is in a coordinate space relative to the task rect
-    // (so they are independent of the task origin).
+    // (so it is independent of the task origin).
-    v_center = aCenter * radius_scale;
+    v_pos = (aTaskRect.zw * aPosition.xy - aCenter) * radius_scale;
-    v_center.y *= aXYRatio;
-
-    v_pos = aTaskRect.zw * aPosition.xy * radius_scale;
     v_pos.y *= aXYRatio;
 
     v_gradient_repeat = float(aExtendMode == EXTEND_MODE_REPEAT);
@@ -55,9 +50,21 @@ void main(void) {
 
 void main(void) {
     // Solve for t in length(pd) = v_start_radius + t * rd
-    float offset = length(v_pos - v_center) - v_start_radius;
+    float offset = length(v_pos) - v_start_radius;
 
     oFragColor = sample_gradient(offset);
 }
 
+#ifdef SWGL_DRAW_SPAN
+void swgl_drawSpanRGBA8() {
+    int address = swgl_validateGradient(sGpuCache, get_gpu_cache_uv(v_gradient_address),
+                                        int(GRADIENT_ENTRIES + 2.0));
+    if (address < 0) {
+        return;
+    }
+    swgl_commitRadialGradientRGBA8(sGpuCache, address, GRADIENT_ENTRIES, v_gradient_repeat != 0.0,
+                                   v_pos, v_start_radius);
+}
+#endif
+
 #endif

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

@@ -1,7 +1,7 @@
 platform(linux,mac) == border-clamp-corner-radius.yaml border-clamp-corner-radius.png
 fuzzy(1,840) == border-gradient-simple.yaml border-gradient-simple-ref.yaml
 platform(linux,mac) == border-gradient-nine-patch.yaml border-gradient-nine-patch.png
-== border-radial-gradient-simple.yaml border-radial-gradient-simple-ref.yaml
+fuzzy-if(platform(swgl),1,4) == border-radial-gradient-simple.yaml border-radial-gradient-simple-ref.yaml
 platform(linux,mac) == border-radial-gradient-nine-patch.yaml border-radial-gradient-nine-patch.png
 == fuzzy(1,10) border-radii.yaml border-radii.png
 == border-none.yaml border-none-ref.yaml

layout/reftests/border-image/reftest.list

@@ -73,7 +73,7 @@ fuzzy(0-1,0-19200) fails-if(OSX) fuzzy-if(skiaContent,0-3,0-20000) fuzzy-if(webr
 fuzzy(0-1,0-912) fuzzy-if(webrender,0-3,0-3008) == border-image-repeating-radial-gradient.html border-image-repeating-radial-gradient-ref.html
 fuzzy(0-1,0-1720) fuzzy-if(skiaContent,0-3,0-1044) fuzzy-if(webrender,0-3,0-62078) == border-image-repeating-radial-gradient-slice-1.html border-image-repeating-radial-gradient-slice-1-ref.html
 fuzzy(0-1,0-2119) fuzzy-if(skiaContent,0-3,0-936) fuzzy-if(webrender,0-3,0-40536) == border-image-repeating-radial-gradient-slice-2.html border-image-repeating-radial-gradient-slice-2-ref.html
-fuzzy(0-1,0-3170) fuzzy-if(skiaContent,0-3,0-1794) fuzzy-if(webrender&&!geckoview,1-3,30-12000) == border-image-repeating-radial-gradient-slice-fill-1.html border-image-repeating-radial-gradient-slice-fill-1-ref.html
+fuzzy(0-1,0-3170) fuzzy-if(skiaContent,0-3,0-1794) fuzzy-if(webrender&&!geckoview,1-3,30-12193) == border-image-repeating-radial-gradient-slice-fill-1.html border-image-repeating-radial-gradient-slice-fill-1-ref.html
 fuzzy(0-1,0-3281) fails-if(OSX) fuzzy-if(skiaContent,0-3,0-1435) fuzzy-if(webrender&&!geckoview,1-2,20-8000) == border-image-repeating-radial-gradient-slice-fill-2.html border-image-repeating-radial-gradient-slice-fill-2-ref.html
 fuzzy(0-1,0-1328) fuzzy-if(webrender,0-3,0-7441) == border-image-repeating-radial-gradient-width.html border-image-repeating-radial-gradient-width-ref.html
 fuzzy(0-4,0-21628) fails-if(OSX) fuzzy-if(webrender,0-8,0-99728) == border-image-repeating-radial-gradient-slice-width.html border-image-repeating-radial-gradient-slice-width-ref.html