Factor code to rotate a canvas about a point.

gm/fontscaler.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 "gm.h"
 #include "SkTypeface.h"
 
 namespace skiagm {
 
 class FontScalerGM : public GM {
 public:
     FontScalerGM() {
         this->setBGColor(0xFFFFFFFF);
     }
 
-    virtual ~FontScalerGM() {
-    }
-
 protected:
 
     SkString onShortName() override {
         SkString name("fontscaler");
         name.append(sk_tool_utils::major_platform_os_name());
         return name;
     }
 
     SkISize onISize() override {
         return SkISize::Make(1450, 750);
     }
 
-    static void rotate_about(SkCanvas* canvas,
-                             SkScalar degrees,
-                             SkScalar px, SkScalar py) {
-        canvas->translate(px, py);
-        canvas->rotate(degrees);
-        canvas->translate(-px, -py);
-    }
-
     void onDraw(SkCanvas* canvas) override {
         SkPaint paint;
 
         paint.setAntiAlias(true);
         paint.setLCDRenderText(true);
         //With freetype the default (normal hinting) can be really ugly.
         //Most distros now set slight (vertical hinting only) in any event.
         paint.setHinting(SkPaint::kSlight_Hinting);
 
         const char* text = "Hamburgefons ooo mmm";
         const size_t textLen = strlen(text);
 
         for (int j = 0; j < 2; ++j) {
             // This used to do 6 iterations but it causes the N4 to crash in the MSAA4 config.
             for (int i = 0; i < 5; ++i) {
                 SkScalar x = SkIntToScalar(10);
                 SkScalar y = SkIntToScalar(20);
 
                 SkAutoCanvasRestore acr(canvas, true);
                 canvas->translate(SkIntToScalar(50 + i * 230),
                                   SkIntToScalar(20));
-                rotate_about(canvas, SkIntToScalar(i * 5), x, y * 10);
+                canvas->rotate(SkIntToScalar(i * 5), x, y * 10);
 
                 {
                     SkPaint p;
                     p.setAntiAlias(true);
                     SkRect r;
                     r.set(x - SkIntToScalar(3), SkIntToScalar(15),
                           x - SkIntToScalar(1), SkIntToScalar(280));
                     canvas->drawRect(r, p);
                 }
 
@@ skipping 11 matching lines @@
 private:
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static GM* MyFactory(void*) { return new FontScalerGM; }
 static GMRegistry reg(MyFactory);
 
 }