NEON fast path for box blur

gm/imageblur.cpp

Index: gm/imageblur.cpp
diff --git a/gm/imageblur.cpp b/gm/imageblur.cpp
index 0e506534c381eaf79a9992f59e5e4c96e19e08b9..7a4630079434fa011e6ef6f8c6ff6e87c2466dac 100644
--- a/gm/imageblur.cpp
+++ b/gm/imageblur.cpp
@@ -16,13 +16,17 @@ namespace skiagm {
 
 class ImageBlurGM : public GM {
 public:
-    ImageBlurGM() {
+    ImageBlurGM(SkScalar sigmaX, SkScalar sigmaY)
+        : fSigmaX(sigmaX), fSigmaY(sigmaY) {
         this->setBGColor(0xFF000000);
     }
 
 protected:
     virtual SkString onShortName() {
-        return SkString("imageblur");
+        SkString name;
+        name.printf("imageblur_%.2f_%.2f",

[Stephen White, 2013/12/19 15:27:03]

This will cause the tools to consider the imageblur and imageblur_24.00_0.00 to
be different tests. Could you pass the name in the GM constructor for now, and
call the old one "imageblur" and the new one "imageblur_large"? That way, we'll
at least have continuity of coverage over this change.

[zheng.xu, 2013/12/20 04:29:54]

Done.

+            SkScalarToFloat(fSigmaX), SkScalarToFloat(fSigmaY));
+        return name;
     }
 
     virtual SkISize onISize() {
@@ -31,7 +35,7 @@ protected:
 
     virtual void onDraw(SkCanvas* canvas) {
         SkPaint paint;
-        paint.setImageFilter(new SkBlurImageFilter(24.0f, 0.0f))->unref();
+        paint.setImageFilter(new SkBlurImageFilter(fSigmaX, fSigmaY))->unref();
         canvas->saveLayer(NULL, &paint);
         const char* str = "The quick brown fox jumped over the lazy dog.";
 
@@ -50,12 +54,18 @@ protected:
     }
 
 private:
+    SkScalar fSigmaX;
+    SkScalar fSigmaY;
+
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
-static GM* MyFactory(void*) { return new ImageBlurGM; }
-static GMRegistry reg(MyFactory);
+static GM* MyFactory1(void*) { return new ImageBlurGM(24.0f, 0.0f); }
+static GMRegistry reg1(MyFactory1);
+
+static GM* MyFactory2(void*) { return new ImageBlurGM(80.0f, 80.0f); }
+static GMRegistry reg2(MyFactory2);
 
 }