libs/hwui/tests/common/scenes/SimpleGradientAnimation.cpp

/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


#include "TestSceneBase.h"

#include <SkGradientShader.h>

class SimpleGradientAnimation;

static TestScene::Registrar _SimpleGradient(TestScene::Info{
    "simpleGradient",
    "A benchmark of shader performance of linear, 2 color gradients with black in them.",
    TestScene::simpleCreateScene<SimpleGradientAnimation>
});

class SimpleGradientAnimation : public TestScene {
public:
    std::vector< sp<RenderNode> > cards;
    void createContent(int width, int height, Canvas& canvas) override {
        canvas.drawColor(Color::White, SkBlendMode::kSrcOver);

        sp<RenderNode> card = createCard(0, 0, width, height);
        canvas.drawRenderNode(card.get());
        cards.push_back(card);
    }
    void doFrame(int frameNr) override {
        int curFrame = frameNr % 20;
        for (size_t ci = 0; ci < cards.size(); ci++) {
            cards[ci]->mutateStagingProperties().setTranslationX(curFrame);
            cards[ci]->mutateStagingProperties().setTranslationY(curFrame);
            cards[ci]->setPropertyFieldsDirty(RenderNode::X | RenderNode::Y);
        }
    }
private:
    sp<RenderNode> createCard(int x, int y, int width, int height) {
        return TestUtils::createNode(x, y, x + width, y + height,
                [width, height](RenderProperties& props, Canvas& canvas) {
            float pos[] = { 0, 1 };
            SkPoint pts[] = { SkPoint::Make(0, 0), SkPoint::Make(width, height) };
            SkPaint paint;
            // overdraw several times to emphasize shader cost
            for (int i = 0; i < 10; i++) {
                // use i%2 start position to pick 2 color combo with black in it
                SkColor colors[3] = { Color::Transparent, Color::Black, Color::Cyan_500 };
                paint.setShader(SkGradientShader::MakeLinear(pts, colors + (i % 2), pos, 2,
                    SkShader::kClamp_TileMode));
                canvas.drawRect(i, i, width, height, paint);
            }
        });
    }
};