Add CanvasState tests

LOCAL_CFLAGS := $(hwui_cflags)

LOCAL_SRC_FILES += \

    unit_tests/CanvasStateTests.cpp \

    unit_tests/ClipAreaTests.cpp \

    unit_tests/DamageAccumulatorTests.cpp \

    unit_tests/LinearAllocatorTests.cpp

/*

 * Copyright (C) 2015 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 "CanvasState.h"

#include "Matrix.h"

#include "Rect.h"

#include "utils/LinearAllocator.h"

#include <gtest/gtest.h>

#include <SkPath.h>

#include <SkRegion.h>

#include <SkCanvas.h>

namespace android {

namespace uirenderer {

class NullClient: public CanvasStateClient {

    void onViewportInitialized() override {}

    void onSnapshotRestored(const Snapshot& removed, const Snapshot& restored) {}

    GLuint getTargetFbo() const override { return 0; }

};

static NullClient sNullClient;

static bool approxEqual(const Matrix4& a, const Matrix4& b) {

    for (int i = 0; i < 16; i++) {

        if (!MathUtils::areEqual(a[i], b[i])) {

            return false;

        }

    }

    return true;

}

TEST(CanvasState, gettersAndSetters) {

    CanvasState state(sNullClient);

    state.setViewport(200, 200);

    state.initializeSaveStack(0, 0, state.getWidth(), state.getHeight(), Vector3());

    ASSERT_EQ(state.getWidth(), 200);

    ASSERT_EQ(state.getHeight(), 200);

    Matrix4 simpleTranslate;

    simpleTranslate.loadTranslate(10, 20, 0);

    state.setMatrix(simpleTranslate);

    ASSERT_EQ(state.getRenderTargetClipBounds(), Rect(0, 0, 200, 200));

    ASSERT_EQ(state.getLocalClipBounds(), Rect(-10, -20, 190, 180));

    EXPECT_TRUE(approxEqual(*state.currentTransform(), simpleTranslate));

    EXPECT_TRUE(state.clipIsSimple());

}

TEST(CanvasState, simpleClipping) {

    CanvasState state(sNullClient);

    state.setViewport(200, 200);

    state.initializeSaveStack(0, 0, state.getWidth(), state.getHeight(), Vector3());

    state.clipRect(0, 0, 100, 100, SkRegion::kIntersect_Op);

    ASSERT_EQ(state.getRenderTargetClipBounds(), Rect(0, 0, 100, 100));

    state.clipRect(10, 10, 200, 200, SkRegion::kIntersect_Op);

    ASSERT_EQ(state.getRenderTargetClipBounds(), Rect(10, 10, 100, 100));

    state.clipRect(50, 50, 150, 150, SkRegion::kReplace_Op);

    ASSERT_EQ(state.getRenderTargetClipBounds(), Rect(50, 50, 150, 150));

}

TEST(CanvasState, complexClipping) {

    CanvasState state(sNullClient);

    state.setViewport(200, 200);

    state.initializeSaveStack(0, 0, state.getWidth(), state.getHeight(), Vector3());

    state.save(SkCanvas::kClip_SaveFlag | SkCanvas::kMatrix_SaveFlag);

    {

        // rotated clip causes complex clip

        state.rotate(10);

        EXPECT_TRUE(state.clipIsSimple());

        state.clipRect(0, 0, 200, 200, SkRegion::kIntersect_Op);

        EXPECT_FALSE(state.clipIsSimple());

    }

    state.restore();

    state.save(SkCanvas::kClip_SaveFlag | SkCanvas::kMatrix_SaveFlag);

    {

        // subtracted clip causes complex clip

        EXPECT_TRUE(state.clipIsSimple());

        state.clipRect(50, 50, 150, 150, SkRegion::kDifference_Op);

        EXPECT_FALSE(state.clipIsSimple());

    }

    state.restore();

    state.save(SkCanvas::kClip_SaveFlag | SkCanvas::kMatrix_SaveFlag);

    {

        // complex path causes complex clip

        SkPath path;

        path.addOval(SkRect::MakeWH(200, 200));

        EXPECT_TRUE(state.clipIsSimple());

        state.clipPath(&path, SkRegion::kDifference_Op);

        EXPECT_FALSE(state.clipIsSimple());

    }

    state.restore();

}

TEST(CanvasState, saveAndRestore) {

    CanvasState state(sNullClient);

    state.setViewport(200, 200);

    state.initializeSaveStack(0, 0, state.getWidth(), state.getHeight(), Vector3());

    state.save(SkCanvas::kClip_SaveFlag);

    {

        state.clipRect(0, 0, 10, 10, SkRegion::kIntersect_Op);

        ASSERT_EQ(state.getRenderTargetClipBounds(), Rect(0, 0, 10, 10));

    }

    state.restore();

    ASSERT_EQ(state.getRenderTargetClipBounds(), Rect(0, 0, 200, 200)); // verify restore

    Matrix4 simpleTranslate;

    simpleTranslate.loadTranslate(10, 10, 0);

    state.save(SkCanvas::kMatrix_SaveFlag);

    {

        state.translate(10, 10, 0);

        EXPECT_TRUE(approxEqual(*state.currentTransform(), simpleTranslate));

    }

    state.restore();

    EXPECT_FALSE(approxEqual(*state.currentTransform(), simpleTranslate));

}

TEST(CanvasState, saveAndRestoreButNotTooMuch) {

    CanvasState state(sNullClient);

    state.setViewport(200, 200);

    state.initializeSaveStack(0, 0, state.getWidth(), state.getHeight(), Vector3());

    state.save(SkCanvas::kMatrix_SaveFlag); // Note: clip not saved

    {

        state.clipRect(0, 0, 10, 10, SkRegion::kIntersect_Op);

        ASSERT_EQ(state.getRenderTargetClipBounds(), Rect(0, 0, 10, 10));

    }

    state.restore();

    ASSERT_EQ(state.getRenderTargetClipBounds(), Rect(0, 0, 10, 10)); // verify not restored

    Matrix4 simpleTranslate;

    simpleTranslate.loadTranslate(10, 10, 0);

    state.save(SkCanvas::kClip_SaveFlag); // NOTE: matrix not saved

    {

        state.translate(10, 10, 0);

        EXPECT_TRUE(approxEqual(*state.currentTransform(), simpleTranslate));

    }

    state.restore();

    EXPECT_TRUE(approxEqual(*state.currentTransform(), simpleTranslate)); // verify not restored

}

}

}