Make lines a special case in GrShape

src/gpu/GrDrawContext.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrBatchTest.h"
 #include "GrColor.h"
 #include "GrDrawContext.h"
@@ skipping 958 matching lines @@
 
     bool useCoverageAA = should_apply_coverage_aa(paint, fRenderTarget.get());
     constexpr bool kHasUserStencilSettings = false;
     bool isStencilBufferMSAA = fRenderTarget->isStencilBufferMultisampled();
 
     const GrPathRendererChain::DrawType type =
         useCoverageAA ? GrPathRendererChain::kColorAntiAlias_DrawType
                       : GrPathRendererChain::kColor_DrawType;
 
     GrShape shape(path, style);
+    if (shape.isEmpty()) {
+        return;
+    }
     GrPathRenderer::CanDrawPathArgs canDrawArgs;
     canDrawArgs.fShaderCaps = fDrawingManager->getContext()->caps()->shaderCaps();
     canDrawArgs.fViewMatrix = &viewMatrix;
     canDrawArgs.fShape = &shape;
     canDrawArgs.fAntiAlias = useCoverageAA;
     canDrawArgs.fHasUserStencilSettings = kHasUserStencilSettings;
     canDrawArgs.fIsStencilBufferMSAA = isStencilBufferMSAA;
 
     // Try a 1st time without applying any of the style to the geometry (and barring sw)
     GrPathRenderer* pr = fDrawingManager->getPathRenderer(canDrawArgs, false, type);
@@ skipping 41 matching lines @@
 
 void GrDrawContext::drawBatch(const GrPipelineBuilder& pipelineBuilder, const GrClip& clip,
                               GrDrawBatch* batch) {
     ASSERT_SINGLE_OWNER
     RETURN_IF_ABANDONED
     SkDEBUGCODE(this->validate();)
     GR_AUDIT_TRAIL_AUTO_FRAME(fAuditTrail, "GrDrawContext::drawBatch");
 
     this->getDrawTarget()->drawBatch(pipelineBuilder, this, clip, batch);
 }