SurfaceFlinger: Regression test for b/74220420

                              tolerance);

}

TEST_F(LayerTransactionTest, SetColorWithParentAlpha_Bug74220420) {

    sp<SurfaceControl> bufferLayer;

    sp<SurfaceControl> parentLayer;

    sp<SurfaceControl> colorLayer;

    ASSERT_NO_FATAL_FAILURE(bufferLayer = createLayer("test bg", 32, 32));

    ASSERT_NO_FATAL_FAILURE(parentLayer = createLayer("parentWithAlpha", 32, 32));

    ASSERT_NO_FATAL_FAILURE(fillLayerColor(bufferLayer, Color::RED));

    ASSERT_NO_FATAL_FAILURE(colorLayer = createLayer(

            "childWithColor", 32, 32, ISurfaceComposerClient::eFXSurfaceColor));

    const half3 color(15.0f / 255.0f, 51.0f / 255.0f, 85.0f / 255.0f);

    const float alpha = 0.25f;

    const ubyte3 expected((vec3(color) * alpha + vec3(1.0f, 0.0f, 0.0f) * (1.0f - alpha)) * 255.0f);

    // this is handwavy, but the precision loss scaled by 255 (8-bit per

    // channel) should be less than one

    const uint8_t tolerance = 1;

    Transaction()

            .reparent(colorLayer, parentLayer->getHandle())

            .setColor(colorLayer, color)

            .setAlpha(parentLayer, alpha)

            .setLayer(parentLayer, mLayerZBase + 1)

            .apply();

    screenshot()->expectColor(Rect(0, 0, 32, 32), {expected.r, expected.g, expected.b, 255},

                              tolerance);

}

TEST_F(LayerTransactionTest, SetColorWithBuffer) {

    sp<SurfaceControl> bufferLayer;

    ASSERT_NO_FATAL_FAILURE(bufferLayer = createLayer("test", 32, 32));