Remove dashing from gpu veto

With new veto our new veto test results look like the following:
TP: true positive (picked to use gpu and gpu was faster)
I: inderminate, the raster time is withing 5% of gpu time

        TP  FP  TN  FN  I

old     21  9   15  12  3
new     29  12  11  6   3

There are three skps that tend to move from TN -> FP, however
the absolute difference in their run times are not huge between
them. The largest being desk_booking which is about 7.1 raster
and 8.8 gpu. The other two skps are desk_yahooanswers and
desk_linkedin

BUG=skia:
R=bsalomon@google.com, robertphillips@google.com

Author: egdaniel@google.com

Review URL: https://codereview.chromium.org/334053005

3 files changed, 64 insertions, 7 deletions

diff --git a/src/core/SkPicturePlayback.cpp b/src/core/SkPicturePlayback.cpp
index 75801fb960..16887107fb 100644
--- a/src/core/SkPicturePlayback.cpp
+++ b/src/core/SkPicturePlayback.cpp
@@ -14,6 +14,10 @@
 #include "SkTSort.h"
 #include "SkWriteBuffer.h"
 
+#if SK_SUPPORT_GPU
+#include "GrContext.h"
+#endif
+
 template <typename T> int SafeCount(const T* obj) {
     return obj ? obj->count() : 0;
 }
@@ -1335,27 +1339,51 @@ void SkPicturePlayback::draw(SkCanvas& canvas, SkDrawPictureCallback* callback)
 
 
 #if SK_SUPPORT_GPU
-bool SkPicturePlayback::suitableForGpuRasterization(GrContext* context, const char **reason) const {
+bool SkPicturePlayback::suitableForGpuRasterization(GrContext* context, const char **reason,
+                                                    int sampleCount) const {
     // TODO: the heuristic used here needs to be refined
     static const int kNumPaintWithPathEffectUsesTol = 1;
     static const int kNumAAConcavePaths = 5;
 
     SkASSERT(fContentInfo.numAAHairlineConcavePaths() <= fContentInfo.numAAConcavePaths());
 
-    bool ret = fContentInfo.numPaintWithPathEffectUses() < kNumPaintWithPathEffectUsesTol &&
+    int numNonDashedPathEffects = fContentInfo.numPaintWithPathEffectUses() -
+                                  fContentInfo.numFastPathDashEffects();
+
+    bool suitableForDash = (0 == fContentInfo.numPaintWithPathEffectUses()) ||
+                           (numNonDashedPathEffects < kNumPaintWithPathEffectUsesTol
+                            && 0 == sampleCount);
+
+    bool ret = suitableForDash &&
                     (fContentInfo.numAAConcavePaths() - fContentInfo.numAAHairlineConcavePaths()) 
                     < kNumAAConcavePaths;
     if (!ret && NULL != reason) {
-        if (fContentInfo.numPaintWithPathEffectUses() >= kNumPaintWithPathEffectUsesTol)
-            *reason = "Too many path effects.";
-        else if ((fContentInfo.numAAConcavePaths() - fContentInfo.numAAHairlineConcavePaths()) 
-                 >= kNumAAConcavePaths)
+        if (!suitableForDash) {
+            if (0 != sampleCount) {
+                *reason = "Can't use multisample on dash effect.";
+            } else {
+                *reason = "Too many non dashed path effects.";
+            }
+        } else if ((fContentInfo.numAAConcavePaths() - fContentInfo.numAAHairlineConcavePaths()) 
+                    >= kNumAAConcavePaths)
             *reason = "Too many anti-aliased concave paths.";
         else
             *reason = "Unknown reason for GPU unsuitability.";
     }
     return ret;
 }
+
+bool SkPicturePlayback::suitableForGpuRasterization(GrContext* context, const char **reason,
+                                                    GrPixelConfig config, SkScalar dpi) const {
+
+    if (context != NULL) {
+        return this->suitableForGpuRasterization(context, reason,
+                                                 context->getRecommendedSampleCount(config, dpi));
+    } else {
+        return this->suitableForGpuRasterization(NULL, reason);
+    }
+}
+
 #endif
 ///////////////////////////////////////////////////////////////////////////////
 
diff --git a/src/core/SkPicturePlayback.h b/src/core/SkPicturePlayback.h
index 23c49cfe71..3cdd9af3f3 100644
--- a/src/core/SkPicturePlayback.h
+++ b/src/core/SkPicturePlayback.h
@@ -70,18 +70,21 @@ public:
 
     void set(const SkPictureContentInfo& src) {
         fNumPaintWithPathEffectUses = src.fNumPaintWithPathEffectUses;
+        fNumFastPathDashEffects = src.fNumFastPathDashEffects;
         fNumAAConcavePaths = src.fNumAAConcavePaths;
         fNumAAHairlineConcavePaths = src.fNumAAHairlineConcavePaths;
     }
 
     void reset() {
         fNumPaintWithPathEffectUses = 0;
+        fNumFastPathDashEffects = 0;
         fNumAAConcavePaths = 0;
         fNumAAHairlineConcavePaths = 0;
     }
 
     void swap(SkPictureContentInfo* other) {
         SkTSwap(fNumPaintWithPathEffectUses, other->fNumPaintWithPathEffectUses);
+        SkTSwap(fNumFastPathDashEffects, other->fNumFastPathDashEffects);
         SkTSwap(fNumAAConcavePaths, other->fNumAAConcavePaths);
         SkTSwap(fNumAAHairlineConcavePaths, other->fNumAAHairlineConcavePaths);
     }
@@ -89,6 +92,9 @@ public:
     void incPaintWithPathEffectUses() { ++fNumPaintWithPathEffectUses; }
     int numPaintWithPathEffectUses() const { return fNumPaintWithPathEffectUses; }
 
+    void incFastPathDashEffects() { ++fNumFastPathDashEffects; }
+    int numFastPathDashEffects() const { return fNumFastPathDashEffects; }
+
     void incAAConcavePaths() { ++fNumAAConcavePaths; }
     int numAAConcavePaths() const { return fNumAAConcavePaths; }
 
@@ -102,6 +108,9 @@ private:
     // This field is incremented every time a paint with a path effect is
     // used (i.e., it is not a de-duplicated count)
     int fNumPaintWithPathEffectUses;
+    // This field is incremented every time a paint with a path effect that is
+    // dashed, we are drawing a line, and we can use the gpu fast path
+    int fNumFastPathDashEffects;
     // This field is incremented every time an anti-aliased drawPath call is
     // issued with a concave path
     int fNumAAConcavePaths;
@@ -269,7 +278,19 @@ public:
 #endif
 
 #if SK_SUPPORT_GPU
-    bool suitableForGpuRasterization(GrContext* context, const char **reason) const;
+    /**
+     * sampleCount is the number of samples-per-pixel or zero if non-MSAA.
+     * It is defaulted to be zero.
+     */
+    bool suitableForGpuRasterization(GrContext* context, const char **reason,
+                                     int sampleCount = 0) const;
+
+    /**
+     * Calls getRecommendedSampleCount with GrPixelConfig and dpi to calculate sampleCount
+     * and then calls the above version of suitableForGpuRasterization
+     */
+    bool suitableForGpuRasterization(GrContext* context, const char **reason,
+                                     GrPixelConfig config, SkScalar dpi) const;
 #endif
 
 private:    // these help us with reading/writing
diff --git a/src/core/SkPictureRecord.cpp b/src/core/SkPictureRecord.cpp
index 5d2eca7a55..16856d639d 100644
--- a/src/core/SkPictureRecord.cpp
+++ b/src/core/SkPictureRecord.cpp
@@ -988,6 +988,14 @@ void SkPictureRecord::drawPoints(PointMode mode, size_t count, const SkPoint pts
     size_t initialOffset = this->addDraw(DRAW_POINTS, &size);
     SkASSERT(initialOffset+getPaintOffset(DRAW_POINTS, size) == fWriter.bytesWritten());
     this->addPaint(paint);
+    if (paint.getPathEffect() != NULL) {
+        SkPathEffect::DashInfo info;
+        SkPathEffect::DashType dashType = paint.getPathEffect()->asADash(&info);
+        if (2 == count && SkPaint::kRound_Cap != paint.getStrokeCap() &&
+            SkPathEffect::kDash_DashType == dashType && 2 == info.fCount) {
+            fContentInfo.incFastPathDashEffects();
+        }
+    }
     this->addInt(mode);
     this->addInt(SkToInt(count));
     fWriter.writeMul4(pts, count * sizeof(SkPoint));