bench/SKPAnimationBench.cpp

   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 }