Check for xfer barriers in GrBatch, auto-issue barriers in GrGpu

src/gpu/GrImmediateDrawTarget.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 "GrImmediateDrawTarget.h"
 
 #include "GrGpu.h"
 #include "GrPipeline.h"
 #include "GrRenderTarget.h"
 #include "SkRect.h"
 #include "SkTypes.h"
 
 #include "batches/GrBatch.h"
 
 GrImmediateDrawTarget::GrImmediateDrawTarget(GrContext* context)
     : INHERITED(context)
     , fBatchTarget(this->getGpu())
     , fDrawID(0) {
 }
 
 GrImmediateDrawTarget::~GrImmediateDrawTarget() {
     this->reset();
 }
 
 void GrImmediateDrawTarget::onDrawBatch(GrBatch* batch) {
-    const GrXferProcessor& xp = *batch->pipeline()->getXferProcessor();
-    GrRenderTarget* rt = batch->pipeline()->getRenderTarget();
-
-    GrXferBarrierType barrierType;
-    if (xp.willNeedXferBarrier(rt, *this->caps(), &barrierType)) {
-        this->getGpu()->xferBarrier(rt, barrierType);
-    }
-
     fBatchTarget.resetNumberOfDraws();
 
     batch->generateGeometry(&fBatchTarget);
     batch->setNumberOfDraws(fBatchTarget.numberOfDraws());
 
     fBatchTarget.preFlush();
     fBatchTarget.flushNext(batch->numberOfDraws());
     fBatchTarget.postFlush();
 }
 
@@ skipping 23 matching lines @@
     this->getGpu()->discard(renderTarget);
 }
 
 void GrImmediateDrawTarget::onReset() {
     fBatchTarget.reset();
 }
 
 void GrImmediateDrawTarget::onFlush() {
     ++fDrawID;
 }