commit 489147c78b2091b87a80dac50a3e8f0f8eb42124
author bsalomon <bsalomon@google.com> Mon Dec 14 12:13:09 2015 -0800
committer Commit bot <commit-bot@chromium.org> Mon Dec 14 12:13:09 2015 -0800
tree 9351e967262b57c46b1f19bc79c832b2e25ba6d4
parent 1cbb5ea0a07255bcc0b8351ddf1fc84f50887aef

Add option to control maximum GrBatch lookback

Review URL: https://codereview.chromium.org/1498653002

src/gpu/GrDrawTarget.cpp

diff --git a/src/gpu/GrDrawTarget.cpp b/src/gpu/GrDrawTarget.cpp
index 59488c4..55f6624 100644
--- a/src/gpu/GrDrawTarget.cpp
+++ b/src/gpu/GrDrawTarget.cpp
@@ -32,6 +32,9 @@
 
 ////////////////////////////////////////////////////////////////////////////////
 
+// 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))
@@ -44,6 +47,8 @@
     fClipMaskManager.reset(new GrClipMaskManager(this, options.fClipBatchToBounds));
 
     fDrawBatchBounds = options.fDrawBatchBounds;
+    fMaxBatchLookback = (options.fMaxBatchLookback < 0) ? kDefaultMaxBatchLookback :
+                                                          options.fMaxBatchLookback;
 
     rt->setLastDrawTarget(this);
 
@@ -469,8 +474,6 @@
     // 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",
@@ -480,7 +483,7 @@
         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) {