SKPAnimationBench.cpp

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/*
 * 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 "bench/GpuTools.h"
#include "bench/SKPAnimationBench.h"
#include "include/core/SkSurface.h"
#include "tools/flags/CommandLineFlags.h"
 
 
SKPAnimationBench::SKPAnimationBench(const char* name, const SkPicture* pic, const SkIRect& clip,
                                     sk_sp<Animation> animation, bool doLooping)
    : INHERITED(name, pic, clip, 1.0, doLooping)
    , fAnimation(std::move(animation)) {
    fUniqueName.printf("%s_%s", name, fAnimation->getTag());
}
 
const char* SKPAnimationBench::onGetUniqueName() {
    return fUniqueName.c_str();
}
 
void SKPAnimationBench::onPerCanvasPreDraw(SkCanvas* canvas) {
    INHERITED::onPerCanvasPreDraw(canvas);
    fDevBounds = canvas->getDeviceClipBounds();
    SkAssertResult(!fDevBounds.isEmpty());
}
 
void SKPAnimationBench::drawPicture() {
    for (int j = 0; j < this->tileRects().size(); ++j) {
        SkMatrix trans = SkMatrix::Translate(-1.f * this->tileRects()[j].fLeft,
                                             -1.f * this->tileRects()[j].fTop);
        fAnimation->preConcatFrameMatrix(fAnimationTime.nextRangeF(0, 1000), fDevBounds, &trans);
        this->surfaces()[j]->getCanvas()->drawPicture(this->picture(), &trans, nullptr);
    }
 
    for (int j = 0; j < this->tileRects().size(); ++j) {
        skgpu::Flush(this->surfaces()[j].get());
    }
}
 
class ZoomAnimation : public SKPAnimationBench::Animation {
public:
    ZoomAnimation(SkScalar zoomMax, double zoomPeriodMs)
        : fZoomMax(zoomMax)
        , fZoomPeriodMs(zoomPeriodMs) {
    }
 
    const char* getTag() override { return "zoom"; }
 
    void preConcatFrameMatrix(double animationTimeMs, const SkIRect& devBounds,
                              SkMatrix* drawMatrix) override {
        double t = fmod(animationTimeMs / fZoomPeriodMs, 1.0); // t is in [0, 1).
        t = fabs(2 * t - 1); // Make t ping-pong between 0 and 1
        SkScalar zoom = static_cast<SkScalar>(pow(fZoomMax, t));
 
        SkPoint center = SkPoint::Make((devBounds.fLeft + devBounds.fRight) / 2.0f,
                                       (devBounds.fTop + devBounds.fBottom) / 2.0f);
        drawMatrix->preTranslate(center.fX, center.fY);
        drawMatrix->preScale(zoom, zoom);
        drawMatrix->preTranslate(-center.fX, -center.fY);
    }
 
private:
    double   fZoomMax;
    double   fZoomPeriodMs;
};
 
sk_sp<SKPAnimationBench::Animation> SKPAnimationBench::MakeZoomAnimation(SkScalar zoomMax,
                                                                         double zoomPeriodMs) {
    return sk_make_sp<ZoomAnimation>(zoomMax, zoomPeriodMs);
}