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      1 /*
      2  * Copyright 2015 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "SKPAnimationBench.h"
      9 #include "SkCommandLineFlags.h"
     10 #include "SkMultiPictureDraw.h"
     11 #include "SkSurface.h"
     12 
     13 SKPAnimationBench::SKPAnimationBench(const char* name, const SkPicture* pic, const SkIRect& clip,
     14                                      Animation* animation, bool doLooping)
     15     : INHERITED(name, pic, clip, 1.0, false, doLooping)
     16     , fAnimation(SkRef(animation)) {
     17     fUniqueName.printf("%s_%s", name, fAnimation->getTag());
     18 }
     19 
     20 const char* SKPAnimationBench::onGetUniqueName() {
     21     return fUniqueName.c_str();
     22 }
     23 
     24 void SKPAnimationBench::onPerCanvasPreDraw(SkCanvas* canvas) {
     25     INHERITED::onPerCanvasPreDraw(canvas);
     26     SkAssertResult(canvas->getClipDeviceBounds(&fDevBounds));
     27     fAnimationTimer.start();
     28 }
     29 
     30 void SKPAnimationBench::drawPicture() {
     31     fAnimationTimer.end();
     32 
     33     for (int j = 0; j < this->tileRects().count(); ++j) {
     34         SkMatrix trans = SkMatrix::MakeTrans(-1.f * this->tileRects()[j].fLeft,
     35                                              -1.f * this->tileRects()[j].fTop);
     36         fAnimation->preConcatFrameMatrix(fAnimationTimer.fWall, fDevBounds, &trans);
     37         this->surfaces()[j]->getCanvas()->drawPicture(this->picture(), &trans, nullptr);
     38     }
     39 
     40     for (int j = 0; j < this->tileRects().count(); ++j) {
     41        this->surfaces()[j]->getCanvas()->flush();
     42     }
     43 }
     44 
     45 class ZoomAnimation : public SKPAnimationBench::Animation {
     46 public:
     47     ZoomAnimation(SkScalar zoomMax, double zoomPeriodMs)
     48         : fZoomMax(zoomMax)
     49         , fZoomPeriodMs(zoomPeriodMs) {
     50     }
     51 
     52     virtual const char* getTag() { return "zoom"; }
     53 
     54     virtual void preConcatFrameMatrix(double animationTimeMs, const SkIRect& devBounds,
     55                                       SkMatrix* drawMatrix) {
     56         double t = fmod(animationTimeMs / fZoomPeriodMs, 1.0); // t is in [0, 1).
     57         t = fabs(2 * t - 1); // Make t ping-pong between 0 and 1
     58         SkScalar zoom = static_cast<SkScalar>(pow(fZoomMax, t));
     59 
     60         SkPoint center = SkPoint::Make((devBounds.fLeft + devBounds.fRight) / 2.0f,
     61                                        (devBounds.fTop + devBounds.fBottom) / 2.0f);
     62         drawMatrix->preTranslate(center.fX, center.fY);
     63         drawMatrix->preScale(zoom, zoom);
     64         drawMatrix->preTranslate(-center.fX, -center.fY);
     65     }
     66 
     67 private:
     68     double   fZoomMax;
     69     double   fZoomPeriodMs;
     70 };
     71 
     72 SKPAnimationBench::Animation* SKPAnimationBench::CreateZoomAnimation(SkScalar zoomMax,
     73                                                                      double zoomPeriodMs) {
     74     return new ZoomAnimation(zoomMax, zoomPeriodMs);
     75 }
     76