Pre-crop filled rects to avoid scissor

src/gpu/GrClipMaskManager.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrClipMaskManager.h"
 #include "GrCaps.h"
 #include "GrDrawingManager.h"
@@ skipping 250 matching lines @@
                                     &genID,
                                     &initialState,
                                     &clipSpaceIBounds,
                                     &requiresAA);
     if (elements.isEmpty()) {
         if (GrReducedClip::kAllOut_InitialState == initialState) {
             return false;
         } else {
             SkIRect scissorSpaceIBounds(clipSpaceIBounds);
             scissorSpaceIBounds.offset(-clip.origin());
-            if (!SkRect::Make(scissorSpaceIBounds).contains(devBounds)) {
+            if (!GrClip::CanIgnoreScissor(scissorSpaceIBounds, devBounds)) {
                 out->makeScissored(scissorSpaceIBounds);
             }
             return true;
         }
     }
 
     // An element count of 4 was chosen because of the common pattern in Blink of:
     //   isect RR
     //   diff  RR
     //   isect convex_poly
@@ skipping 13 matching lines @@
             // is multisampled.
             disallowAnalyticAA = pipelineBuilder.isHWAntialias() ||
                                  pipelineBuilder.hasUserStencilSettings();
         }
         sk_sp<GrFragmentProcessor> clipFP;
         if (requiresAA &&
             get_analytic_clip_processor(elements, disallowAnalyticAA, clipToRTOffset, devBounds,
                                         &clipFP)) {
             SkIRect scissorSpaceIBounds(clipSpaceIBounds);
             scissorSpaceIBounds.offset(-clip.origin());
-            if (!SkRect::Make(scissorSpaceIBounds).contains(devBounds)) {
+            if (GrClip::CanIgnoreScissor(scissorSpaceIBounds, devBounds)) {
+                out->makeFPBased(std::move(clipFP), SkRect::Make(scissorSpaceIBounds));
+            } else {
                 out->makeScissoredFPBased(std::move(clipFP), scissorSpaceIBounds);
-                return true;
             }
-            out->makeFPBased(std::move(clipFP), SkRect::Make(scissorSpaceIBounds));
             return true;
         }
     }
 
     // If the stencil buffer is multisampled we can use it to do everything.
     if (!drawContext->isStencilBufferMultisampled() && requiresAA) {
         sk_sp<GrTexture> result;
 
         // The top-left of the mask corresponds to the top-left corner of the bounds.
         SkVector clipToMaskOffset = {
@@ skipping 42 matching lines @@
                           initialState,
                           elements,
                           clipSpaceIBounds,
                           clipSpaceToStencilSpaceOffset);
 
     // This must occur after createStencilClipMask. That function may change the scissor. Also, it
     // only guarantees that the stencil mask is correct within the bounds it was passed, so we must
     // use both stencil and scissor test to the bounds for the final draw.
     SkIRect scissorSpaceIBounds(clipSpaceIBounds);
     scissorSpaceIBounds.offset(clipSpaceToStencilSpaceOffset);
-    out->makeScissoredStencil(scissorSpaceIBounds);
+    if (GrClip::CanIgnoreScissor(scissorSpaceIBounds, devBounds)) {
+        out->makeStencil(true, devBounds);
+    } else {
+        out->makeScissoredStencil(scissorSpaceIBounds);
+    }
     return true;
 }
 
 static bool stencil_element(GrDrawContext* dc,
                             const GrFixedClip& clip,
                             const GrUserStencilSettings* ss,
                             const SkMatrix& viewMatrix,
                             const SkClipStack::Element* element) {
 
     // TODO: Draw rrects directly here.
@@ skipping 422 matching lines @@
     sk_sp<GrTexture> result(texProvider->createApproxTexture(desc));
     if (!result) {
         return nullptr;
     }
     result->resourcePriv().setUniqueKey(key);
 
     helper.toTexture(result.get());
 
     return result;
 }