Factor code to rotate a canvas about a point.

bench/BitmapBench.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Benchmark.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
@@ skipping 221 matching lines @@
             const SkScalar y = SkIntToScalar(dim.fHeight) / 2;
 
             canvas->translate(x, y);
             // just enough so we can't take the sprite case
             canvas->scale(SK_Scalar1 * 99/100, SK_Scalar1 * 99/100);
             canvas->translate(-x, -y);
         }
         if (fFlags & kRotate_Flag) {
             const SkScalar x = SkIntToScalar(dim.fWidth) / 2;
             const SkScalar y = SkIntToScalar(dim.fHeight) / 2;
-
-            canvas->translate(x, y);
-            canvas->rotate(SkIntToScalar(35));
-            canvas->translate(-x, -y);
+            canvas->rotate(SkIntToScalar(35), x, y);
         }
         INHERITED::onDraw(loops, canvas);
     }
 
     void setupPaint(SkPaint* paint) override {
         this->INHERITED::setupPaint(paint);
 
         int index = 0;
         if (fFlags & kBilerp_Flag) {
             index |= 1;
@@ skipping 125 matching lines @@
 DEF_BENCH( return new FilterBitmapBench(kN32_SkColorType, kOpaque_SkAlphaType, true, false, kScale_Flag | kRotate_Flag | kBilerp_Flag); )
 
 DEF_BENCH( return new FilterBitmapBench(kN32_SkColorType, kPremul_SkAlphaType, false, false, kScale_Flag | kBilerp_Flag | kBicubic_Flag); )
 DEF_BENCH( return new FilterBitmapBench(kN32_SkColorType, kPremul_SkAlphaType, false, false, kScale_Flag | kRotate_Flag | kBilerp_Flag | kBicubic_Flag); )
 
 // source alpha tests -> S32A_Opaque_BlitRow32_{arm,neon}
 DEF_BENCH( return new SourceAlphaBitmapBench(SourceAlphaBitmapBench::kOpaque_SourceAlpha, kN32_SkColorType); )
 DEF_BENCH( return new SourceAlphaBitmapBench(SourceAlphaBitmapBench::kTransparent_SourceAlpha, kN32_SkColorType); )
 DEF_BENCH( return new SourceAlphaBitmapBench(SourceAlphaBitmapBench::kTwoStripes_SourceAlpha, kN32_SkColorType); )
 DEF_BENCH( return new SourceAlphaBitmapBench(SourceAlphaBitmapBench::kThreeStripes_SourceAlpha, kN32_SkColorType); )