Change to add zoom animations to nanobench

bench/SKPAnimationBench.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 "SKPAnimationBench.h"
+#include "SkCommandLineFlags.h"
+#include "SkMultiPictureDraw.h"
+#include "SkSurface.h"
+
+SKPAnimationBench::SKPAnimationBench(const char* name, const SkPicture* pic,
+                                     const SkIRect& clip, SkMatrix viewMatrix, int steps)
+    : INHERITED(name, pic, clip, 1.0, false)
+    , fSteps(steps)
+    , fViewMatrix(viewMatrix)
+    , fName(name) {
+    fUniqueName.printf("%s_animation", name);
+}
+
+const char* SKPAnimationBench::onGetName() {
+    return fName.c_str();
+}
+
+const char* SKPAnimationBench::onGetUniqueName() {
+    return fUniqueName.c_str();
+}
+
+void SKPAnimationBench::onPerCanvasPreDraw(SkCanvas* canvas) {
+    INHERITED::onPerCanvasPreDraw(canvas);
+    SkIRect bounds;
+    SkAssertResult(canvas->getClipDeviceBounds(&bounds));
+
+    fCenter.set((bounds.fRight - bounds.fLeft) / 2.0f,
+                (bounds.fBottom - bounds.fTop) / 2.0f);
+}
+
+void SKPAnimationBench::drawPicture() {
+    SkMatrix workingMatrix = SkMatrix::MakeTrans(fCenter.fX, fCenter.fY);
+    workingMatrix.postConcat(fViewMatrix);
+    SkMatrix reverseTranslate = SkMatrix::MakeTrans(-fCenter.fX, -fCenter.fY);
+    workingMatrix.postConcat(reverseTranslate);
+
+    for (int i = 0; i < fSteps; i++) {
+        workingMatrix.postConcat(fViewMatrix);
+        for (int j = 0; j < this->tileRects().count(); ++j) {
+            SkMatrix trans = SkMatrix::MakeTrans(-this->tileRects()[j].fLeft,
+                                                 -this->tileRects()[j].fTop);
+            workingMatrix.postConcat(trans);
+            this->surfaces()[j]->getCanvas()->drawPicture(this->picture(), &workingMatrix, NULL);
+        }
+
+        for (int j = 0; j < this->tileRects().count(); ++j) {
+           this->surfaces()[j]->getCanvas()->flush();
+        }
+    }
+}