Fast path for blurred round rects -- blur a small 9patch rect on the CPU

src/effects/SkBlurMask.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.
  */
 
 
 #include "SkBlurMask.h"
@@ skipping 457 matching lines @@
 
 ///////////////////////////////////////////////////////////////////////////////
 
 // we use a local function to wrap the class static method to work around
 // a bug in gcc98
 void SkMask_FreeImage(uint8_t* image);
 void SkMask_FreeImage(uint8_t* image) {
     SkMask::FreeImage(image);
 }
 
-bool SkBlurMask::BoxBlur(SkMask* dst, const SkMask& src, SkScalar sigma, SkBlurStyle style,
-                         SkBlurQuality quality, SkIPoint* margin) {
+bool SkBlurMask::BoxBlur(SkMask* dst, const SkMask& src,
+                         SkScalar sigma, SkBlurStyle style, SkBlurQuality quality,
+                         SkIPoint* margin, bool force_quality) {
+
     if (src.fFormat != SkMask::kA8_Format) {
         return false;
     }
 
     // Force high quality off for small radii (performance)
-    if (sigma <= SkIntToScalar(2)) {
+    if (!force_quality && sigma <= SkIntToScalar(2)) {
         quality = kLow_SkBlurQuality;
     }
 
     SkScalar passRadius;
     if (kHigh_SkBlurQuality == quality) {
         // For the high quality path the 3 pass box blur kernel width is
         // 6*rad+1 while the full Gaussian width is 6*sigma.
         passRadius = sigma - (1/6.0f);
     } else {
         // For the low quality path we only attempt to cover 3*sigma of the
@@ skipping 485 matching lines @@
         (void)autoCall.detach();
     }
 
     if (style == kInner_SkBlurStyle) {
         dst->fBounds = src.fBounds; // restore trimmed bounds
         dst->fRowBytes = src.fRowBytes;
     }
 
     return true;
 }