Add DrawShipSim sample.

samplecode/SampleShip.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SampleCode.h"
 #include "Resources.h"
 #include "SkAnimTimer.h"
 #include "SkView.h"
 #include "SkCanvas.h"
 #include "SkRSXform.h"
 #include "SkSurface.h"
 #include "Timer.h"
 
 #include <stdio.h>
 
 static const int kGrid = 100;
 static const int kWidth = 960;
 static const int kHeight = 640;
 
+typedef void (*DrawAtlasProc)(SkCanvas*, SkImage*, const SkRSXform[], const SkRect[],

[robertphillips, 2015/10/07 18:07:00]

tab over ?

+const SkColor[], int, const SkRect*, const SkPaint*);
+
+static void draw_atlas(SkCanvas* canvas, SkImage* atlas, const SkRSXform xform[],
+                       const SkRect tex[], const SkColor colors[], int count, const SkRect* cull,
+                       const SkPaint* paint) {
+    canvas->drawAtlas(atlas, xform, tex, colors, count, SkXfermode::kModulate_Mode, cull, paint);
+}
+
+static void draw_atlas_sim(SkCanvas* canvas, SkImage* atlas, const SkRSXform xform[],

[robertphillips, 2015/10/07 18:07:00]

\n ?

+                           const SkRect tex[], const SkColor colors[], int count, const SkRect* cull,
+                           const SkPaint* paint) {
+    for (int i = 0; i < count; ++i) {
+        SkMatrix matrix;
+        matrix.setRSXform(xform[i]);
+        
+        canvas->save();
+        canvas->concat(matrix);
+        canvas->drawImageRect(atlas, tex[i], tex[i].makeOffset(-tex[i].x(), -tex[i].y()), paint,
+                              SkCanvas::kFast_SrcRectConstraint);
+        canvas->restore();
+    }
+}
+
+
 class DrawShipView : public SampleView {
-    const char*         fName;
-
 public:
-    DrawShipView(const char name[]) : fName(name) {
+    DrawShipView(const char name[], DrawAtlasProc proc) : fName(name), fProc(proc) {
         fAtlas.reset(GetResourceAsImage("ship.png"));
         if (!fAtlas) {
             SkDebugf("\nCould not decode file ship.png. Falling back to penguin mode.\n");
             fAtlas.reset(GetResourceAsImage("baby_tux.png"));
             if (!fAtlas) {
                 SkDebugf("\nCould not decode file baby_tux.png. Did you forget"
                          " to set the resourcePath?\n");
                 return;
             }
         }
@@ skipping 78 matching lines @@
             
             fXform[i].fSCos = kCosDiff*c - kSinDiff*s;
             fXform[i].fSSin = kSinDiff*c + kCosDiff*s;
             
             dx -= fXform[i].fSCos*anchorX - fXform[i].fSSin*anchorY;
             dy -= fXform[i].fSSin*anchorX + fXform[i].fSCos*anchorY;
             fXform[i].fTx += dx;
             fXform[i].fTy += dy;
         }
         
-        canvas->drawAtlas(fAtlas, fXform, fTex, nullptr, kGrid*kGrid+1, SkXfermode::kSrcOver_Mode,
-                          nullptr, &paint);
+        fProc(canvas, fAtlas, fXform, fTex, nullptr, kGrid*kGrid+1, nullptr, &paint);
         canvas->drawText(outString.c_str(), outString.size(), 100.f, 100.f, paint);
 
         this->inval(nullptr);
     }
 
 #if 0
     // TODO: switch over to use this for our animation
     bool onAnimate(const SkAnimTimer& timer) override {
         SkScalar angle = SkDoubleToScalar(fmod(timer.secs() * 360 / 24, 360));
         fAnimatingDrawable->setSweep(angle);
         return true;
     }
 #endif
 
 private:
+    const char*         fName;
+    DrawAtlasProc       fProc;
+    
     SkAutoTUnref<SkImage> fAtlas;
     SkRSXform   fXform[kGrid*kGrid+1];
     SkRect      fTex[kGrid*kGrid+1];
     WallTimer   fTimer;
     float       fTimes[32];
     int         fCurrentTime;
     
     
     typedef SampleView INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
-DEF_SAMPLE( return new DrawShipView("DrawShip"); )
+DEF_SAMPLE( return new DrawShipView("DrawShip", draw_atlas); )
+DEF_SAMPLE( return new DrawShipView("DrawShipSim", draw_atlas_sim); )