check for culled-out paths inside SkDraw

src/core/SkDraw.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #define __STDC_LIMIT_MACROS
 
 #include "SkDraw.h"
 #include "SkBlitter.h"
@@ skipping 999 matching lines @@
             if (scale > 0) {
                 return scale;
             }
         }
     }
     return 1;
 }
 
 void SkDraw::drawDevPath(const SkPath& devPath, const SkPaint& paint, bool drawCoverage,
                          SkBlitter* customBlitter, bool doFill) const {
+    // Do a quick-reject test, since a looper or other modifier may have moved us out of range.
+    {
+        // outset 1 in case we're antialiasing
+        SkRect clipBounds = SkRect::Make(fRC->getBounds()).makeOffset(1, 1);

[f(malita), 2016/07/18 16:34:15]

makeOutset()

+
+        if (paint.getMaskFilter()) {
+            paint.getMaskFilter()->computeFastBounds(clipBounds, &clipBounds);
+        }
+        if (!clipBounds.intersects(devPath.getBounds())) {
+            return;
+        }
+    }
+
     SkBlitter* blitter = nullptr;
     SkAutoBlitterChoose blitterStorage;
     if (nullptr == customBlitter) {
         blitterStorage.choose(fDst, *fMatrix, paint, drawCoverage);
         blitter = blitterStorage.get();
     } else {
         blitter = customBlitter;
     }
 
     if (paint.getMaskFilter()) {
@@ skipping 1054 matching lines @@
         mask->fImage = SkMask::AllocImage(size);
         memset(mask->fImage, 0, mask->computeImageSize());
     }
 
     if (SkMask::kJustComputeBounds_CreateMode != mode) {
         draw_into_mask(*mask, devPath, style);
     }
 
     return true;
 }