Add option to control maximum GrBatch lookback

src/gpu/GrDrawTarget.cpp

 
 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrDrawTarget.h"
 
@@ skipping 14 matching lines @@
 #include "batches/GrDiscardBatch.h"
 #include "batches/GrDrawBatch.h"
 #include "batches/GrDrawPathBatch.h"
 #include "batches/GrRectBatchFactory.h"
 #include "batches/GrStencilPathBatch.h"
 
 #include "SkStrokeRec.h"
 
 ////////////////////////////////////////////////////////////////////////////////
 
+// Experimentally we have found that most batching occurs within the first 10 comparisons.
+static const int kDefaultMaxBatchLookback = 10;
+
 GrDrawTarget::GrDrawTarget(GrRenderTarget* rt, GrGpu* gpu, GrResourceProvider* resourceProvider,
                            const Options& options)
     : fGpu(SkRef(gpu))
     , fResourceProvider(resourceProvider)
     , fFlushing(false)
     , fFlags(0)
     , fRenderTarget(rt) {
     // TODO: Stop extracting the context (currently needed by GrClipMaskManager)
     fContext = fGpu->getContext();
     fClipMaskManager.reset(new GrClipMaskManager(this, options.fClipBatchToBounds));
 
     fDrawBatchBounds = options.fDrawBatchBounds;
+    fMaxBatchLookback = (options.fMaxBatchLookback < 0) ? kDefaultMaxBatchLookback :
+                                                          options.fMaxBatchLookback;
 
     rt->setLastDrawTarget(this);
 
 #ifdef SK_DEBUG
     static int debugID = 0;
     fDebugID = debugID++;
 #endif
 }
 
 GrDrawTarget::~GrDrawTarget() {
@@ skipping 405 matching lines @@
 }
 
 void GrDrawTarget::recordBatch(GrBatch* batch) {
     // A closed drawTarget should never receive new/more batches
     SkASSERT(!this->isClosed());
 
     // Check if there is a Batch Draw we can batch with by linearly searching back until we either
     // 1) check every draw
     // 2) intersect with something
     // 3) find a 'blocker'
-    // Experimentally we have found that most batching occurs within the first 10 comparisons.
-    static const int kMaxLookback = 10;
 
     GrBATCH_INFO("Re-Recording (%s, B%u)\n"
         "\tBounds LRTB (%f, %f, %f, %f)\n",
         batch->name(),
         batch->uniqueID(),
         batch->bounds().fLeft, batch->bounds().fRight,
         batch->bounds().fTop, batch->bounds().fBottom);
     GrBATCH_INFO(SkTabString(batch->dumpInfo(), 1).c_str());
     GrBATCH_INFO("\tOutcome:\n");    
-    int maxCandidates = SkTMin(kMaxLookback, fBatches.count());
+    int maxCandidates = SkTMin(fMaxBatchLookback, fBatches.count());
     if (maxCandidates) {
         int i = 0;
         while (true) {
             GrBatch* candidate = fBatches.fromBack(i);
             // We cannot continue to search backwards if the render target changes
             if (candidate->renderTargetUniqueID() != batch->renderTargetUniqueID()) {
                 GrBATCH_INFO("\t\tBreaking because of (%s, B%u) Rendertarget\n",
                     candidate->name(), candidate->uniqueID());
                 break;
             }
@@ skipping 47 matching lines @@
     }
 
     return true;
 }
 
 void GrDrawTarget::clearStencilClip(const SkIRect& rect, bool insideClip, GrRenderTarget* rt) {
     GrBatch* batch = new GrClearStencilClipBatch(rect, insideClip, rt);
     this->recordBatch(batch);
     batch->unref();
 }